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NSYSU
1.
Huang, Pei-chi.
Study on Wave Field with Multiple Porous Layers.
Degree: Master, Marine Environment and Engineering, 2010, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347 
► Wave interaction with a rubble-mound breakwater has been studied experimentally in the thesis. The breakwater may contain multi-layer anisotropic but homogeneous media. Fluid outside the…
(more)
▼ Wave interaction with a rubble-mound breakwater has been studied experimentally in the thesis.
The breakwater may contain multi-layer anisotropic but homogeneous media. Fluid outside the
porous layer field is assumed to incompressible and viscous,and the flow field is irrational. The study
applies the velocity potential to describe the wave field with small amplitude incident wave.
Under the consideration of linearity, Analytical solution is solved from boundary value
program by the method of separation of variables. It bases on dispersion equation. Try to find the
range and position of the complex eigenvalues in each
porous column and to solve the velocity
potential in the field by numerical methods. Wave reflection, transmission, and energy dissipation
with a rubble-mound breakwater have been investigated experimentally, and consider the wave close
linear wave theory, the wave steepness smaller than 0.035. Three different sizes of grain are used to
construct the
porous base, they are 16mm, 25mm, and 35mm, respectively. Single and double layers
of
porous base are considered.
Some of the reflection coefficient are convergence, but they are the unreasonable results.
Maybe the trouble is in the process of the computation with determination of .eigenvalues. When the
wave has long period, the double-layer
porous model reduces more wave energy, when the wave has
short period, the single-layer
porous and the smaller
porous material model can disappears more wave
energy. The characteristic of internal resistance in the
porous has the difference along with the wave
period. When the model crest is higher than the sea level, the consumption of wave energy are more
when it is shorter along with the wave period. As a submerged breakwater, the effect for disappears
wave energy to be limited.
Advisors/Committee Members: Tai-Wen Hsu (chair), Chung-Pan Lee (committee member), Yang-Yih Chen (chair), I-Fan Tseng (chair), Yung-Fang Chiu (chair).
Subjects/Keywords: permeable structure; porous media
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APA (6th Edition):
Huang, P. (2010). Study on Wave Field with Multiple Porous Layers. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Web. 23 Jan 2021.
Vancouver:
Huang P. Study on Wave Field with Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Huang P. Study on Wave Field with Multiple Porous Layers. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
2.
Wang, Yuzhu.
Reconstruction of high-resolution pore structures from micro-tomography images.
Degree: Petroleum Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/60126
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:50962/SOURCE2?view=true
► A three-dimensional (3D) high-resolution inner structure of rock sample is premise for reservoir evaluation at pore scale. Micro X-ray computed micro-tomography (micro-CT) is considered to…
(more)
▼ A three-dimensional (3D) high-resolution inner
structure of rock sample is premise for reservoir evaluation at pore scale. Micro X-ray computed micro-tomography (micro-CT) is considered to be the most direct way to obtain the 3D inner
structure of
porous media without destruction of the sample. Limited resolution of micro-CT image, however, hinders its ability in describing small structures which are critical for its topological features and transportation properties. An effective strategy to solve this problem would be to deploy numerical method to reconstruct high-resolution
porous structure based on micro-CT image. In this thesis, a local-similarity based reconstruction method is proposed to improve the resolution of
porous structure extracted from micro-CT image.The numerical reconstruction of
porous structure used in this thesis is a supervised prediction process with two steps: extracting prior knowledge (descriptors) from training images and reproducing the extracted descriptors in reconstructed images by applying an appropriate mathematical method. The innovation of this approach is correspondingly embodied in two aspects. In terms of descriptors extraction, the proposed technique uses a pair of registered high- and low-resolution images as training images and the
structure information is stored in a set of image patch (or cube in 3D) pairs extracted from high- and low-resolution training images rather than two-point correlation functions and multiple-point statistics which is widely used in currently popular reconstruction algorithms. In terms of
structure reproduction, a set of mathematical methods including neighbours embedding, sparse representation and convolutional neural networks are applied to reach target
structure as close as possible, reduce computation time and extend its applicability to complex
porous structure. The proposed techniques have been applied in reconstructing
porous structure of Fontainebleau sandstone, Indiana Limestone and a typical shale sample. The reconstruction performance has been evaluated by visual sensitivity, mean square error and morphological measurements. The performance analysis is not only carried out between reconstructed image and high-resolution reference image, also among different reconstruction methods. The experimental result shows that the proposed methods are able to successfully reproduce the
structure features closer to that of the reference image than those reconstruction techniques currently being used.
Advisors/Committee Members: Rahman, Sheik, Petroleum Engineering, Faculty of Engineering, UNSW, Arns, Christoph, Petroleum Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Local-similarity; Porous structure reconstruction; Micro-tomography
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APA (6th Edition):
Wang, Y. (2018). Reconstruction of high-resolution pore structures from micro-tomography images. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60126 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:50962/SOURCE2?view=true
Chicago Manual of Style (16th Edition):
Wang, Yuzhu. “Reconstruction of high-resolution pore structures from micro-tomography images.” 2018. Doctoral Dissertation, University of New South Wales. Accessed January 23, 2021.
http://handle.unsw.edu.au/1959.4/60126 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:50962/SOURCE2?view=true.
MLA Handbook (7th Edition):
Wang, Yuzhu. “Reconstruction of high-resolution pore structures from micro-tomography images.” 2018. Web. 23 Jan 2021.
Vancouver:
Wang Y. Reconstruction of high-resolution pore structures from micro-tomography images. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Jan 23].
Available from: http://handle.unsw.edu.au/1959.4/60126 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:50962/SOURCE2?view=true.
Council of Science Editors:
Wang Y. Reconstruction of high-resolution pore structures from micro-tomography images. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60126 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:50962/SOURCE2?view=true
3.
Virgiliis, Afonso Luís Corrêa de.
Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias.
Degree: Mestrado, Engenharia de Transportes, 2009, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-08092010-122549/
;
► O trabalho tem por objetivo apresentar procedimentos de projeto e execução de obras de pavimentos permeáveis visando sua aplicação prática como medidas compensatórias de drenagem…
(more)
▼ O trabalho tem por objetivo apresentar procedimentos de projeto e execução de obras de pavimentos permeáveis visando sua aplicação prática como medidas compensatórias de drenagem urbana com a finalidade de retenção e amortecimento de picos de enchentes em cidades densamente urbanizadas. Os procedimentos propostos se baseiam na experiência adquirida para a implementação de dois tipos de pavimentos permeáveis; um com revestimento constituído de blocos intertravados de concreto e outro com revestimento de concreto asfáltico poroso, conhecido como camada porosa de atrito. Para subsidiar o trabalho uma pista experimental foi construída como área de estacionamento nas dependências do Centro Tecnológico de Hidráulica CTH na Universidade de São Paulo onde foi realizado o experimento. O local do estacionamento atua como um reservatório subsuperficial de águas pluviais sendo que sua estrutura, constituída de agregados granulares, abriga no interior de seus vazios a água infiltrada pelas camadas do pavimento. Recomenda-se, após os estudos, que os procedimentos e seqüências de atividades de projeto e execução de obras de pavimentos permeáveis sejam contemplados pelo poder público e privado como solução alternativa em diferentes empreendimentos urbanos como grandes áreas públicas ou particulares, estacionamentos, parques, quadras esportivas, passeios, calçamentos e ruas de pouca solicitação de tráfego entre outros.
The present work intents to show design and built procedures, of porous pavements; by paying attention on its practical appliances as compensatory option in urban drainage with purpose to retaining rainfall water by storage, reducing downstream flooding in cities with great urban density. The procedures here proposed are based in the know how acquired for the construction of two kinds of porous pavements: one built with interlocked concrete blocks and the other built with porous asphalt. In order to aid the present work, an experimental field was built as parking area inside the propriety of CTH Centro Tecnologico de Hidraulica in State University of Sao Paulo where the tests and experiments were made. The parking area is a reservoir structure where rain water is stored inside courses of aggregates. The storage volume is in the void space between particles of material that comes by infiltration trough the pavement layer. The commendation, after the studies, is that procedures and activities of design and build of porous pavements could be observed by government and private sector as alternative solution in many kinds of urban projects such as large public and private lots, parking areas sport fields side walks and streets, with low capacity of traffic loads, and so forth.
Advisors/Committee Members: Suzuki, Carlos Yukio.
Subjects/Keywords: Blocos intertravados; Camadas drenantes; Concrete blocks; Concreto asfáltico poroso; Drainage courses; Pavimento permeável; Porous asphalt; Porous pavements; Porous structure
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APA (6th Edition):
Virgiliis, A. L. C. d. (2009). Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3138/tde-08092010-122549/ ;
Chicago Manual of Style (16th Edition):
Virgiliis, Afonso Luís Corrêa de. “Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias.” 2009. Masters Thesis, University of São Paulo. Accessed January 23, 2021.
http://www.teses.usp.br/teses/disponiveis/3/3138/tde-08092010-122549/ ;.
MLA Handbook (7th Edition):
Virgiliis, Afonso Luís Corrêa de. “Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias.” 2009. Web. 23 Jan 2021.
Vancouver:
Virgiliis ALCd. Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias. [Internet] [Masters thesis]. University of São Paulo; 2009. [cited 2021 Jan 23].
Available from: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-08092010-122549/ ;.
Council of Science Editors:
Virgiliis ALCd. Procedimentos de projeto e execução de pavimentos permeáveis visando retenção e amortecimento de picos de cheias. [Masters Thesis]. University of São Paulo; 2009. Available from: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-08092010-122549/ ;
Penn State University
4.
Mezghani, Adnen.
Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers.
Degree: 2020, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/17570azm1131
► An integral component in two-phase thermal management systems, namely, heat pipes (HP) and vapor chambers (VC), is a porous wicking structure. Traditional methods for manufacturing…
(more)
▼ An integral component in two-phase thermal management systems, namely, heat pipes (HP) and vapor chambers (VC), is a
porous wicking
structure. Traditional methods for manufacturing wicking structures within HPs and VCs involve secondary manufacturing and assembly processes and are generally limited to simple pipe-like or plate-like geometries. More complex geometries may, however, be possible with laser powder bed fusion (LPBF) additive manufacturing (AM), which permits high level of geometric complexity, part consolidation, and customization. The work presented in this thesis aims to leverage the unprecedented level of customization and geometric complexity permitted through LPBF AM to produce copper HPs and VCs with integrated wicking structures. Several copper wicking structures were successfully fabricated via partial sintering and via the formation of square, hexagonal, and rectangular arrangements of micro-pins and micro-grooves. These represent the first published reports on LPBF AM of copper wicking structures for HPs/VCs applications. The copper wicks were also successfully fabricated in multiple build directions. The fabricated wicks were then characterized by measuring porosity and permeability as well as conducting capillary rate-of-rise analysis. Results are compared with recently published works on AM for fabricated wicking structures in 316L stainless steel and AlSi12 aluminum material systems. The porosity of fabricated sintered-powder wicks ranged from 0.31 to 0.37, while the measured porosity for micro-pin and micro-groove wicks ranged from 0.55 to 0.85. Capillary performance K/reff achieved ranged from 0.186 μm to 1.79 μm, with the rectangular-arrangement micro-pin wick presenting the highest capillary performance. The results of this work indicate the viability of fabricating copper wicking structures via LPBF and provide foundational knowledge and experimental validation necessary for additively manufacturing complete assemblies of copper HPs and VCs.
Advisors/Committee Members: Abdalla Ramadan Nassar, Thesis Advisor/Co-Advisor, Edward William Reutzel, Committee Member, Judith Todd Copley, Committee Member, Timothy W. Simpson, Program Head/Chair.
Subjects/Keywords: vapor chamber; porous structure; wick; additive manufacturing; copper; Thermal management; vapor chamber; porous structure; wick; additive manufacturing; copper; Thermal management; Vapor chamber; porous structure; wick; additive manufacturing; copper; thermal management
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APA ·
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Manager
APA (6th Edition):
Mezghani, A. (2020). Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/17570azm1131
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mezghani, Adnen. “Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers.” 2020. Thesis, Penn State University. Accessed January 23, 2021.
https://submit-etda.libraries.psu.edu/catalog/17570azm1131.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mezghani, Adnen. “Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers.” 2020. Web. 23 Jan 2021.
Vancouver:
Mezghani A. Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers. [Internet] [Thesis]. Penn State University; 2020. [cited 2021 Jan 23].
Available from: https://submit-etda.libraries.psu.edu/catalog/17570azm1131.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mezghani A. Laser Powder Bed Fusion Additive Manufacturing of Copper Wicking Structures for Heat Pipes and Vapor Chambers. [Thesis]. Penn State University; 2020. Available from: https://submit-etda.libraries.psu.edu/catalog/17570azm1131
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
Steins, Prune.
Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers.
Degree: Docteur es, Matériaux céramiques et traitements de surface, 2014, Limoges
URL: http://www.theses.fr/2014LIMO0002
► Dans le cadre du conditionnement des déchets nucléaires, les géopolymères représentent une alternative potentielle aux liants hydrauliques classiques. A ce jour, il est admis que…
(more)
▼ Dans le cadre du conditionnement des déchets nucléaires, les géopolymères représentent une alternative potentielle aux liants hydrauliques classiques. A ce jour, il est admis que la formation des géopolymères procède selon un mécanisme de dissolution - restructuration - polymérisation conduisant à un matériau solide. Cependant, les liens précis entre la composition de la solution d’activation, le déroulement des réactions de géopolymérisation et la microstructure finale doivent être déterminés du point de vue de la texturation et de l’évolution structurale du matériau. Ainsi plusieurs paramètres de formulation ont été étudiés : la nature de l’activateur alcalin, la concentration en silice et l’ajout d’une source d’aluminium. Il apparait que l’environnement chimique des précurseurs silicatés ou alumino-silicatés est contrôlé par les paramètres de formulation constitutifs de la solution d’activation. Lors de la formation du réseau géopolymérique, ces précurseurs jouent un rôle primordial sur la cinétique de dissolution du métakolin, la taille, l’arrangement et l’agrégation des oligomères alumino-silicatés participant à la formation du réseau poreux. A plus long terme, certaines caractéristiques du réseau poreux qui sont-elles même contrôlées par la taille et l’agencement des oligomères, varient légèrement au cours du temps. Le réarrangement de la structure poreuse associé d’une part à la densification du réseau solide, et d'autre part à la fermeture partielle de la porosité conduit à une légère augmentation de la taille des pores et à une diminution du volume poreux accessible.
In the context of conditioning of nuclear waste, geopolymers represent a potential alternative to conventional hydraulic binders. Currently, it is recognized that the formation of geopolymer proceeds according to a mechanism of dissolution - restructuring - polymerization resulting in a solid material. Despite the availability of many studies to understand these mechanisms, the precise relationship between the chemical nature of the activating solution, the geopolymerization process and the final microstructure should be determined from the point of view of the texturing and the structural evolution of the material. In this work, several parameters were studied: the nature of the alkali activator, the silica concentration and the addition of an aluminum source. It appears that the chemical environment of the silicate or aluminosilicate precursors is controlled by the activating solution composition. During the consolidation of the geopolymer network, these precursors play an important role on the dissolution rate of metakaolin, the size, the rearrange¬ment and the aggregation of aluminosilicate oligomers involved in the porous solid network formation. Subsequently, some characteristics of the porous network which are controlled by the size and the rearrangement of oligomers vary slightly over time. The refinement of the porosity associated to first, a densification of the solid network, and secondly, a partial closure of the porosity at the…
Advisors/Committee Members: Rossignol, Sylvie (thesis director), Frizon, Fabien (thesis director).
Subjects/Keywords: Géopolymère; Solution d’activation; Texturation; Structure poreuse; Geopolymer; Activating Solution; Texturing; Porous Structure; 620.192 042
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APA ·
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APA (6th Edition):
Steins, P. (2014). Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers. (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2014LIMO0002
Chicago Manual of Style (16th Edition):
Steins, Prune. “Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers.” 2014. Doctoral Dissertation, Limoges. Accessed January 23, 2021.
http://www.theses.fr/2014LIMO0002.
MLA Handbook (7th Edition):
Steins, Prune. “Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers.” 2014. Web. 23 Jan 2021.
Vancouver:
Steins P. Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers. [Internet] [Doctoral dissertation]. Limoges; 2014. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2014LIMO0002.
Council of Science Editors:
Steins P. Influence des paramètres de formulation sur la texturation et la structuration des géopolymères : Influence of formulation parameters on the texturing and and the structural evolution of geopolymers. [Doctoral Dissertation]. Limoges; 2014. Available from: http://www.theses.fr/2014LIMO0002
University of Cincinnati
6.
Goel, Archak.
Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing.
Degree: MS, Engineering and Applied Science: Mechanical
Engineering, 2019, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552398559313737
► Additive manufacturing methods have recently been used to make light-weighted parts using lattice structures for various applications. Functionally graded lattice structures (FGLs) are structures that…
(more)
▼ Additive manufacturing methods have recently been used
to make light-weighted parts using lattice structures for various
applications. Functionally graded lattice structures (FGLs) are
structures that are designed using lattices with a varying
distribution of porosity by virtue of varying the volume fractions
of each unit cell in the 3D design domain. This graded design
strategy helps achieve advanced properties related to a structure’s
mechanical performance and functionalities such as ingrowth of bone
during tissue implant fixation and transfer of heat in an optimized
fashion in light-weighted structures. Compliance minimization is
one such classic problem where topology optimization techniques are
used to determine the optimum distribution of material in the
design domain while obtaining the desired reduction in weight. This
material distribution is typically populated with lattices of
variable volume fraction unit cells to generate FGLs. Strut type
unit cells such as BCC are commonly used to develop FGLs. In order
to develop such structures with strut type unit cells there is a
need for a methodology that can maintain smooth connectivity among
unit cells of varying densities. This thesis discusses a new method
to achieve smoothly connected FGLs, based on a BCC unit cell
geometry, using a B-spline surface-based unit cell design
methodology. The author’s previous work in [1] on generating
bifurcating geometries using B-spline surfaces is extended to
lattices as a case of multi-furcation geometries. First, a control
polyhedron net is developed on the basis of desired unit cell
geometry which is then further processed to construct watertight
boundary representation of the unit cell using a 3rd order B-spline
surface. This design methodology is used in conjunction with an
algorithm to populate the density distribution from SIMP-based
topology optimization using the unit cells with different volume
fractions. The resulting lattice
structure is compared with a
uniform density lattice
structure of similar light-weighting. It is
shown that the methodology discussed in this paper could be
successfully used to construct FGLs that are stiffer than their
uniform density counterparts.
Advisors/Committee Members: Anand, Sam (Committee Chair).
Subjects/Keywords: Engineering; graded lattice structure; cellular structure; B-spline surfaces; Additive Manufacturing; 3D Printing; porous structures
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APA ·
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MLA ·
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CSE |
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Manager
APA (6th Edition):
Goel, A. (2019). Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552398559313737
Chicago Manual of Style (16th Edition):
Goel, Archak. “Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing.” 2019. Masters Thesis, University of Cincinnati. Accessed January 23, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552398559313737.
MLA Handbook (7th Edition):
Goel, Archak. “Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing.” 2019. Web. 23 Jan 2021.
Vancouver:
Goel A. Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing. [Internet] [Masters thesis]. University of Cincinnati; 2019. [cited 2021 Jan 23].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552398559313737.
Council of Science Editors:
Goel A. Design of Functionally Graded BCC Type Lattice Structures
Using B-spline Surfaces for Additive Manufacturing. [Masters Thesis]. University of Cincinnati; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1552398559313737
NSYSU
7.
Hsu, Wei-lun.
Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths.
Degree: Master, Materials and Optoelectronic Science, 2017, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707117-111402
► High-molecular-weight (high-Mw) block copolymers (BCPs) have been employed for the fabrication of polymer-based photonic crystals because of the advantages of easy scalability, high flexibility, light…
(more)
▼ High-molecular-weight (high-Mw) block copolymers (BCPs) have been employed for the fabrication of polymer-based photonic crystals because of the advantages of easy scalability, high flexibility, light weight and low cost. First, a series of ternary blends of homopolymers or benzoic acid with network-structured high-Mw polystyrene-block-poly(2-vinyl pyridine) (PS-P2VP) BCPs are conducted at a fixed composition so as to control the periodicity of the network microstructures without the alternation of the morphology. With trapping of the structural coloration (TOSC), tunable photonic reflectance with extremely broad wavelengths from visible to near infrared (NIR) region is first carried out in the solid thin-film ternary blends. Furthermore, after removal of the additive homopolymers from the P2VP microdomains by a P2VP-selective ethanol,
porous network nanochannels are observed, providing an excellent nanostructural template for the subsequent synthesis or infiltration of inorganic materials, which can largely enhance the mechanical and thermal properties as well as vary the refractive index contrast for photonic crystals. After exposure under UV irradiation, sol-gel reaction is, therefore, performed in the crosslinked nanoporous network microstructures, giving titanium oxide (TiO2) network microstructures after calcination. We found that the TiO2-based network thin-film photonic crystal is able to exhibit strong reflectivity with unique angle-independent optical property, namely, noniridescence or amorphous photonic crystal (APC). As a result, the manufacture of organic, inorganic or organic/inorganic hybrid network photonic crystals with extremely wide-range reflected wavelengths can be carried out for practical applications such as lasing, sensing, display and wave guide fileds.
Key word: Block copolymer, self-assembly, Network
Structure, Photonic Crystal , TiO2
Porous
Advisors/Committee Members: Wen-Hsien Tseng tseng (chair), Yeo-Wan Chiang (committee member), Wei-Tsung Chuang (chair), Cheng-Yen Wen (chair).
Subjects/Keywords: Block Copolymer; Self-assembly; Network Structure; Photonic Crystal; TiO2 Porous
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APA (6th Edition):
Hsu, W. (2017). Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707117-111402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hsu, Wei-lun. “Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths.” 2017. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707117-111402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hsu, Wei-lun. “Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths.” 2017. Web. 23 Jan 2021.
Vancouver:
Hsu W. Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths. [Internet] [Thesis]. NSYSU; 2017. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707117-111402.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hsu W. Solid-State Network-Structured Block Copolymer Photonic Crystal with Extremely Broad Structural Colorations Ranging from Visible to Near Infrared Wavelengths. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0707117-111402
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Commonwealth University
8.
Zhao, Bo.
Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication.
Degree: PhD, Chemistry, 2012, Virginia Commonwealth University
URL: https://doi.org/10.25772/MR9K-K220
;
https://scholarscompass.vcu.edu/etd/303
► Hierarchical materials offer great promise for high-performance sensors and catalysis carriers. Well-defined hierarchically porous materials are promising candidates for a wide range of applications relating…
(more)
▼ Hierarchical materials offer great promise for high-performance sensors and catalysis carriers. Well-defined hierarchically
porous materials are promising candidates for a wide range of applications relating to biosensors, separations, drug delivery, surface-enhanced Raman scattering (SERS), etc. Research on synthetic methodologies is expanding. However, fabrication of hierarchical
porous structures with tunable pore dimension and shape, controllable pore distribution and interconnectivity is still a challenging task in materials science. One of the main tasks of this work is to establish a facile and reliable approach of making well-defined hierarchically
porous materials. Then, based on those multimodal
porous structures, different functions and applications can be realized.
This work utilizes a direct hard templating method to obtain hierarchical
porous structures with a well-defined bimodal distribution of the pores based on hierarchical templates. The hierarchical templates were prepared by synthetically joining appropriately functionalized commercially available polystyrene (PS) latex spheres together. Two different coupling reactions were used to form the hierarchical templates: carbodiimide-assisted coupling of COOH groups with NH2 groups and base-assisted coupling of epoxy groups with NH2 groups. Two different morphologies of templates, "raspberry-like" and "strawberry-like" were made. The template can be defined by the sizes of both the "core" and the "satellite" spheres, and altering the coverage of "satellites" on the "core". The main advantage of this strategy is the tailorability of the size and shape of the hierarchical templates, which allows an easy and independent adjustment to the multiporosity of the material
structure design. Also, the monodispersed hierarchical templates are constructed of only one material, can be isolated, and can be assembled using standard template packing procedures that have been used for unimodal
porous material fabrication described in published literature.
Based on the predefined monodispersed hierarchical templates, multimodal
porous silica, bimodal
porous gold film and
porous capsules were fabricated in this work as representative 3D, 2D, and 0D hierarchical
porous structures, respectively. Because the template was predefined as one whole body, the connectivity between the big pores and small pores is guaranteed. The way the templates are packed together on a surface also ensures connections between each "template-shaped pore cluster". The uniform interconnectivity and ordered arrangement among the pores allows the different modals of pores to communicate with each other. The different hierarchical
porous materials made in this work were characterized with SEM, TEM, AFM, XPS, STEM, gas adsorption, and mercury intrusion porosity. The results indicate that the multimodal
porous materials can be successfully fabricated using predefined hierarchical templates. The different arrangement (3D, 2D, 0D) of those templates and the independent tailorability of the pore…
Advisors/Committee Members: Maryanne Collinson.
Subjects/Keywords: Hierarchical; templates; multimodal porous structure; Chemistry; Physical Sciences and Mathematics
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APA (6th Edition):
Zhao, B. (2012). Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication. (Doctoral Dissertation). Virginia Commonwealth University. Retrieved from https://doi.org/10.25772/MR9K-K220 ; https://scholarscompass.vcu.edu/etd/303
Chicago Manual of Style (16th Edition):
Zhao, Bo. “Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication.” 2012. Doctoral Dissertation, Virginia Commonwealth University. Accessed January 23, 2021.
https://doi.org/10.25772/MR9K-K220 ; https://scholarscompass.vcu.edu/etd/303.
MLA Handbook (7th Edition):
Zhao, Bo. “Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication.” 2012. Web. 23 Jan 2021.
Vancouver:
Zhao B. Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication. [Internet] [Doctoral dissertation]. Virginia Commonwealth University; 2012. [cited 2021 Jan 23].
Available from: https://doi.org/10.25772/MR9K-K220 ; https://scholarscompass.vcu.edu/etd/303.
Council of Science Editors:
Zhao B. Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication. [Doctoral Dissertation]. Virginia Commonwealth University; 2012. Available from: https://doi.org/10.25772/MR9K-K220 ; https://scholarscompass.vcu.edu/etd/303
9.
Τσακίρογλου, Χρήστος.
Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα.
Degree: 1990, University of Patras
URL: http://nemertes.lis.upatras.gr/jspui/handle/10889/2668
-
Advisors/Committee Members: Παγιατάκης, Αλκιβιάδης, Tsakiroglou, Chris, Παγιατάκης, Αλκιβιάδης, Βερύκιος, Ξ., Κυπαρισσίδης, Κ., Μαρκάτος, Ν., Παύλου, Σ..Subjects/Keywords: Πορώδης δομή; 552.06; Porous structure
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APA (6th Edition):
Τσακίρογλου, . (1990). Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα. (Doctoral Dissertation). University of Patras. Retrieved from http://nemertes.lis.upatras.gr/jspui/handle/10889/2668
Chicago Manual of Style (16th Edition):
Τσακίρογλου, Χρήστος. “Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα.” 1990. Doctoral Dissertation, University of Patras. Accessed January 23, 2021.
http://nemertes.lis.upatras.gr/jspui/handle/10889/2668.
MLA Handbook (7th Edition):
Τσακίρογλου, Χρήστος. “Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα.” 1990. Web. 23 Jan 2021.
Vancouver:
Τσακίρογλου . Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα. [Internet] [Doctoral dissertation]. University of Patras; 1990. [cited 2021 Jan 23].
Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/2668.
Council of Science Editors:
Τσακίρογλου . Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα. [Doctoral Dissertation]. University of Patras; 1990. Available from: http://nemertes.lis.upatras.gr/jspui/handle/10889/2668
Universidade Nova
10.
Sousa, Margarida Bucho Nunes de.
Smart macroporous structures for the purification of viral particles.
Degree: 2014, Universidade Nova
URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/12179
► Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
The increasing application of viral particles in vaccination and gene-based therapies, has led…
(more)
▼ Dissertação para obtenção do Grau de Mestre em
Engenharia Química e Bioquímica
The increasing application of viral particles in vaccination and gene-based therapies, has led to the development of alternative and improved purification processes. Traditional purification methods include chromatographic techniques, however the chromatographic matrices used present limitations specially when aimed at the purification of large molecules. This work presents the preparation of chitosan-based monoliths using clean processes and easy functionalization techniques intending to improve Adenovirus serotype 5 (Ad5) purification.
Monoliths were prepared by blending chitosan (CHT) with glycidylmethacrylate (GMA) or poly(vinyl alcohol) (PVA), using two preparation techniques, freeze-drying and a scCO2 – assisted drying process, and were subsequently functionalized with Q ligands by three different methods. In addition, monoliths blended with magnetic nanoparticles were also prepared using the same strategies to confer them a controlled magnetic response. The monoliths produced were characterized in terms of ligand immobilization yield, and evaluated for Ad5 purification. Two types of monoliths showed potential: the CHT/PVA(50:50) prepared by freeze drying and functionalized by the alternative plasma technique (M2) and the CHT/PVA(50:50) 7% monolith prepared by scCO2 – assisted drying process and functionalized by the epoxyactivation technique (M1). The amount of ligand Q immobilized on the supports was monitored by titration assays, among which the CHT/PVA(50:50) 7% M2 prepared by scCO2 – assisted drying process exhibited the highest immobilization yield (91%). Among the results for Ad5 purification, the CHT/PVA(50:50)M2 and the CHT/PVA(50:50)7% M1 resulted in a 40% and 14% of the viral particles, respectively. Protein-binding assays were conducted using bovine serum albumin (BSA) and lysozyme, to evaluate the anionic-exchange capacity of the supports.
The results make us believe in the potential of the produced monoliths to be applied in chromatographic techniques. However further improvements are necessary to enhance virus binding and recovery, to obtain an improved purification process.
project PTDC/EBB-BIO/118317/2010
Advisors/Committee Members: Roque, Ana, Ricardo, Ana.
Subjects/Keywords: Biopharmaceuticals; Purification; Monoliths; Porous structure; Virus particles; Q ligands
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APA (6th Edition):
Sousa, M. B. N. d. (2014). Smart macroporous structures for the purification of viral particles. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/12179
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sousa, Margarida Bucho Nunes de. “Smart macroporous structures for the purification of viral particles.” 2014. Thesis, Universidade Nova. Accessed January 23, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/12179.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sousa, Margarida Bucho Nunes de. “Smart macroporous structures for the purification of viral particles.” 2014. Web. 23 Jan 2021.
Vancouver:
Sousa MBNd. Smart macroporous structures for the purification of viral particles. [Internet] [Thesis]. Universidade Nova; 2014. [cited 2021 Jan 23].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/12179.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sousa MBNd. Smart macroporous structures for the purification of viral particles. [Thesis]. Universidade Nova; 2014. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/12179
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
11.
Kong, Lingyun.
Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology.
Degree: PhD, Petroleum Engineering, 2019, University of North Dakota
URL: https://commons.und.edu/theses/2568
► The petrophysical and geomechanical properties of rocks link the geology origin with engineering practice, which serves as the fundamental of various disciplinaries associated with…
(more)
▼ The petrophysical and geomechanical properties of rocks link the geology origin with engineering practice, which serves as the fundamental of various disciplinaries associated with subsurface
porous media, including civil engineering, underground water, geological exploration, and petroleum engineering. The research methodologies can be mainly divided into three aspects: theoretical modelling, numerical simulation, and experiments, in which the last approach plays a critical role that can support, validate, calibrate, or even refute a hypothesis. Only replying on repeatable trials and consolidate analysis of precise results can the experiments be successful and convincing, though uncertainties, due to multiple factors, need to be scrutinized and controlled. The challenges also existed in the characterization and measurements of rock properties as a result of heterogeneity and anisotropy as well as the inevitable impact of experimental operation. 3D printing, a cutting-edge technology, was introduced and utilized in the study that is supposed to be capable of controlling the mineralogy, microstructure, physical properties of physical rock replicas and further benefit the petrophysical and geomechanical experimental methodologies.
My PhD research project attempted to answer the questions from the standpoint of petrophysicisits and geomechanics scientist: Can 3D printed rocks replicate natural rocks in terms of microstructure, petrophysical and geomechanical properties? If not, by any means can we improve the quality of replicas to mimic the common rock types? Which 3D printing method is best suitable for our research purposes? How could it be applied in the conventional experiments and integrated with theoretical calculation or numerical simulation?
Three main types of printing materials and techniques (gypsum, silica sand, resin) were characterized first individually, which demonstrated varying microstructure, anisotropy, petrophysical and geomechanical properties. Post-processing effect was examined on the 3D printed gypsum rocks that show impact differences on nanoscale and microscale pore structures. Through comparison, resin, the material used in stereolithography technology, best suits the reconstruction of intricate pore network that aims to complement digital rock physics and ultimately be applied in petrophysical research. Gypsum material, however, has been proved as the best candidate for geomechanical research spanning from reference samples to upscaling methods validation. Currently, a practical approach of utilizing 3D printing in petroleum geoscience is taking advantages of the characteristics we focus on the research while disregarding the other properties, by which a suitable 3D printing material and technique can emerge.
Advisors/Committee Members: Mehdi Ostadhassan.
Subjects/Keywords: 3D Printing; Petrophysics; Pore Structure; Porous Media; Rock Mechanics
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APA (6th Edition):
Kong, L. (2019). Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology. (Doctoral Dissertation). University of North Dakota. Retrieved from https://commons.und.edu/theses/2568
Chicago Manual of Style (16th Edition):
Kong, Lingyun. “Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology.” 2019. Doctoral Dissertation, University of North Dakota. Accessed January 23, 2021.
https://commons.und.edu/theses/2568.
MLA Handbook (7th Edition):
Kong, Lingyun. “Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology.” 2019. Web. 23 Jan 2021.
Vancouver:
Kong L. Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology. [Internet] [Doctoral dissertation]. University of North Dakota; 2019. [cited 2021 Jan 23].
Available from: https://commons.und.edu/theses/2568.
Council of Science Editors:
Kong L. Innovation Of Petrophysical And Geomechanical Experiment Methodologies: The Application Of 3D Printing Technology. [Doctoral Dissertation]. University of North Dakota; 2019. Available from: https://commons.und.edu/theses/2568
University of Melbourne
12.
FANG, JINGHUA.
Fabrication, characterization and application of anodic aluminum oxide.
Degree: 2012, University of Melbourne
URL: http://hdl.handle.net/11343/37573
► A great many scientists have begun the long march towards the routine production of high quality nanomaterials, by focusing on simple and efficient methods for…
(more)
▼ A great many scientists have begun the long march towards the routine production of high quality nanomaterials, by focusing on simple and efficient methods for their bulk production. These high quality nanomaterials must exhibit uniform distribution and size properties if they are to be successfully applied to various technologies. Following the successful growth of carbon nanotubes, great interest has also been sparked in the field of low-dimensional materials, including nanowires, nanotubes and nanodots, an interest which will be further enhanced if these materials can be controllably produced over large surface areas. This is because highly ordered nanostructure arrays not only produce favorable electrical properties, they can also exhibit properties useful for many optical applications. Due to this large range of promising applications, there is significant motivation for improvements in the fabrication methods of these highly-ordered nanomaterials, including aspects such as cost minimization and ease-of-fabrication issues. To-date one of the most efficient and effective fabrication techniques is to employ template assisted methods, with different periodic template structures, since these techniques are relatively easy to implement and are capable of producing large area materials for a low cost. In this area, one of the most popular of these template materials is anodic aluminum oxide (AAO).
AAO templates have been used to fabricate different nanowires, tubes and rods, using techniques such as evaporation, Sol-gel deposition and chemical vapor deposition. These templates have also been used as nanomasks for heavy metal-ion implantation, in order to generate highly ordered array structures, using very high energy ions. Since AAO itself is a transparent dielectric its optical properties have also been studied. For example, large pore sized (200 nm - 500 nm) AAO has been reported to exhibit an optical bandgap in the visible and near infrared region, under normal transmission measurements. Further experiments have also investigated the optical properties of AAO compound materials, including metal-filled metamaterial templates.
A cursory review of the above-described work would seem to portray AAO as a material already comprehensively investigated. However, the precise formation mechanism for its self-assembled and highly ordered honeycomb structure is still not clear. In order to design and prepare different orientations and distributions of nanoporous alumina, for particular applications in the future, the mechanisms involved in formation of AAO templates by electrochemical reactions still need to be understood and controlled. Moreover, the internal structure of AAO templates are of considerable interest, with evidence that the stoichiometric ratio of Al and O is not the simple 2:3. It is widely recognized that the real Achilles heel of AAO is its thermal instability. Researchers who have made efforts to fully realize this…
Subjects/Keywords: anodic aluminum oxide; ordered porous structure; optical materials; nanoreactor; tailoring
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APA (6th Edition):
FANG, J. (2012). Fabrication, characterization and application of anodic aluminum oxide. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/37573
Chicago Manual of Style (16th Edition):
FANG, JINGHUA. “Fabrication, characterization and application of anodic aluminum oxide.” 2012. Doctoral Dissertation, University of Melbourne. Accessed January 23, 2021.
http://hdl.handle.net/11343/37573.
MLA Handbook (7th Edition):
FANG, JINGHUA. “Fabrication, characterization and application of anodic aluminum oxide.” 2012. Web. 23 Jan 2021.
Vancouver:
FANG J. Fabrication, characterization and application of anodic aluminum oxide. [Internet] [Doctoral dissertation]. University of Melbourne; 2012. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/11343/37573.
Council of Science Editors:
FANG J. Fabrication, characterization and application of anodic aluminum oxide. [Doctoral Dissertation]. University of Melbourne; 2012. Available from: http://hdl.handle.net/11343/37573
University of North Texas
13.
Heo, Hyeonu.
Programmable Mechanical Metamaterials with Negative Poisson's Ratio and Negative Thermal Expansion.
Degree: 2016, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc955088/
► Programmable matter is a material whose properties can be programmed to achieve particular shapes or mechanical properties upon command. This is an essential technique that…
(more)
▼ Programmable matter is a material whose properties can be programmed to achieve particular shapes or mechanical properties upon command. This is an essential technique that could one day lead to morphing aircraft and ground vehicles. Metamaterials are the rationally designed artificial materials whose properties are not observed in nature. Their properties are typically controlled by geometry rather than chemical compositions. Combining metamaterials with a programmable function will create a new area in the intelligent material design. The objective of this study is to design and demonstrate a tunable metamaterial and to investigate its thermo-mechanical behavior. An integrated approach to the metamaterial design was used with analytical modeling, numerical simulation, and experimental demonstration. The dynamic thermo-mechanical analysis was used to measure base materials' modulus and thermal expansion coefficient as a function of temperature.
CPS, the unit cell of the metamaterial, is composed of circular holes and slits. By decomposing kinematic rotation of the arm and elastic deformation of a bi-material hinge, thermo-mechanical constitutive models of CPS were developed and it was extended to 3D polyhedral structures for securing isotropic properties. Finite element based numerical simulations of CPS and polyhedral models were conducted for comparison with the analytical model. 3D printing of multi-materials was used for sample fabrication followed by tests with uniaxial compressive mechanical tests and thermal tests at 50℃. From the analytical model of the metamaterial, the contour plots were obtained for the effective properties – Poisson's ratio, the effective coefficient of thermal expansion of the metamaterial as a function of geometry and materials. A controllable range of temperature and strain was identified associated with maximized thermal expansion mismatch and contact on the slit surface of CPS,
respectively. This work will pave the road toward the design of programmable metamaterials with both mechanically- and thermally- tunable capability and provide unique thermo-mechanical properties with a programmable function.
Advisors/Committee Members: Ju, Jaehyung, 1973-, Choi, Tae-Youl, D'Souza, Nandika, Li, Xiaohua.
Subjects/Keywords: metamaterial; negative thermal expansion; compliant porous structure; bi-materi; Engineering, Mechanical
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University of Texas – Austin
14.
Waggoner, Nolan Wayne.
Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism.
Degree: PhD, Chemistry, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/46121
► Porous coordination polymers (PCPs) have emerged as a novel and versatile class of crystalline materials since the late 1990’s due to their high porosity and…
(more)
▼ Porous coordination polymers (PCPs) have emerged as a novel and versatile class of crystalline materials since the late 1990’s due to their high porosity and tunable reactivity. Applications for these materials have spread to areas including gas storage and separations, sensing, magnetism, and more recently, catalysis. However, designing a PCP-based material for a specific application remains a struggle within this field due to their unpredictable self-assembly. In order to overcome this hurdle, linker design has become paramount to the process. The Humphrey Group has developed a new class of PCPs called Phosphine Coordination Materials (PCMs). These materials incorporate one or more phosphorous sites within the linker to act as a point of functionalization. The lone pair of each P(III) site can act as a tunable handle, which allows for access to increased chemical versatility. With this larger goal in mind, the research discussed herein has been focused on the development of novel materials on three fronts: catalytically active linkers, employment of
structure directing agents, and examination of PCMs in magnetism. Several catalytically active organic linkers were developed for the purpose of taking known homogenous reactivity and applying that knowledge to a heterogeneous framework. The linker systems described herein include trans-RuCl2(1,2-C6H4-((P-C6H4-p-CO2H)2)2, the ferrocene backbone system Fe(C5H4)2-(P-(C6H4-p-CO2H)2)2, and the extended building block 1,2-C6H4-(P-(¬p-C6H4-p-C6H4-CO2H)2)2. The second study examined a [Me-P-(C6H4-p-CO2H)3]+ Cl- linker to create a series of frameworks through variation of only the alkali hydroxide added during synthesis. This resulted in five frameworks, four of which were non-isostructural. Designated PCMs 6-9, the frameworks demonstrated unusual pore topology as well as the highest cryogenic oxygen uptake to date for a saturated metal site material. Next, two isostructural materials termed Ln-PCM-21 were synthesized and their experimental bulk magnetic properties were studied. Afterwards, three theoretical models were considered in relation to this experimental data and their relatability was reported. The final study explored the magnetic behavior of a set of 1-dimensional coordination polymers that conversely employed thiolate groups; referred to as Thiolate Coordination Materials (TCMs). One material, Fe-TCM-1, was extensively studied and two isostructural materials were attempted (CoII, MnII), with interest in single-chain magnetic behavior.
Advisors/Committee Members: Humphrey, Simon M. (advisor), Anslyn, Eric V (committee member), Rose, Michael J (committee member), Milliron, Deila J (committee member), Wood, Paul T (committee member).
Subjects/Keywords: MOFs; Porous materials; PCPs; Catalysis; Magnetism; Structure directing agents
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APA (6th Edition):
Waggoner, N. W. (2016). Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/46121
Chicago Manual of Style (16th Edition):
Waggoner, Nolan Wayne. “Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed January 23, 2021.
http://hdl.handle.net/2152/46121.
MLA Handbook (7th Edition):
Waggoner, Nolan Wayne. “Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism.” 2016. Web. 23 Jan 2021.
Vancouver:
Waggoner NW. Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2152/46121.
Council of Science Editors:
Waggoner NW. Development of novel porous coordination polymers with interest in catalysis, structure directing agents, and magnetism. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/46121
RMIT University
15.
Song, T.
Dealloying of Al-based alloys and their mechanisms.
Degree: 2015, RMIT University
URL: http://researchbank.rmit.edu.au/view/rmit:161553
► Metal based anodes, like tin (Sn), are promising candidate anodes for lithium ion batteries (LIBs) due to their higher specific capacities than traditional graphite electrodes.…
(more)
▼ Metal based anodes, like tin (Sn), are promising candidate anodes for lithium ion batteries (LIBs) due to their higher specific capacities than traditional graphite electrodes. However, their dramatic volume expansion during lithiation and delithiation could lead to pulverization of the material as well as inadequate cycle life. Materials with nano/microporosity hold promise to accommodate the volume change. This thesis focuses on preparing porous metallic materials for batteries through a dealloying approach. Dealloying is a selective dissolution process, during which one or more active components dissolve from a binary or multicomponent alloy, leaving behind a (nano)porous-structured material enriched in the nobler or less active alloy component(s). In this thesis, porous Sn and nanoporous Cu-Sn composites, which can be used as anodes, and bimodal porous Cu, which can be used as current collector, have been fabricated by dealloying immiscible Al-Sn alloys, ternary Al-Cu-Sn alloy and two-phase Al-Cu alloy, respectively. The dealloying mechanisms of these precursor alloys have been systematically investigated by a variety of means including both ex-situ and in-situ synchrotron X-ray diffraction (XRD). The following findings are most notable. 1) Micro-sized porous Sn (anode material) can be fabricated by dealloying of immiscible Al-Sn alloys. 2) Nanoporous Cu-Sn composite structures (anode material) can be fabricated by concurrent dealloying and realloying of a ternary Al-Cu-Sn alloy. 3) Bimodal porous Cu materials (current collector) can be fabricated from annealing-electrochemical dealloying of Al-Cu alloys. 4) The dealloying of Al2Cu (first dealloyed) and AlCu occurred in sequence and resulted in a hierarchical nanoporous structure. 5)The temperature sensitivity of intermetallic formation in the Cu-Sn system was confirmed by synchrotron studies of the Al67Cu18Sn15 alloy subjected to dealloying at different temperatures (55 °C, 70 °C and 90 °C). The following findings are most notable.
Subjects/Keywords: Fields of Research; dealloying; nanoporous structure; immiscible alloys; porous tin; lithium ion battery; bimodal porous structure; realloying; synchrotron radiation; crystal structure evolution
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APA (6th Edition):
Song, T. (2015). Dealloying of Al-based alloys and their mechanisms. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:161553
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Song, T. “Dealloying of Al-based alloys and their mechanisms.” 2015. Thesis, RMIT University. Accessed January 23, 2021.
http://researchbank.rmit.edu.au/view/rmit:161553.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Song, T. “Dealloying of Al-based alloys and their mechanisms.” 2015. Web. 23 Jan 2021.
Vancouver:
Song T. Dealloying of Al-based alloys and their mechanisms. [Internet] [Thesis]. RMIT University; 2015. [cited 2021 Jan 23].
Available from: http://researchbank.rmit.edu.au/view/rmit:161553.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Song T. Dealloying of Al-based alloys and their mechanisms. [Thesis]. RMIT University; 2015. Available from: http://researchbank.rmit.edu.au/view/rmit:161553
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
16.
Hung, Pei-Hsuan.
Development of oral materials for regenerative applications.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2018, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0108118-021621
► This research studied the development and characterisation of the bioceramic drug delivery cement composed of calcium sulfate dihydrate (CSD), calcium phosphate cement (CPC), simvastatin and…
(more)
▼ This research studied the development and characterisation of the bioceramic drug delivery cement composed of calcium sulfate dihydrate (CSD), calcium phosphate cement (CPC), simvastatin and collagenase for the vital pulp therapy. The CSD, CPC, simvastatin and collagenase were utilised as drug delivery system for achieving the goal of stimulating the differentiation of dental pulp stem cells. The CSD and CPC powders were blended with 3:7, 5:5 and 7:3 mixture ratios for forming biphasic ceramic cement named CPC3CSD7, CPC5CSD5 and CPC7CSD3. The CPC7CSD3 cement performed feasible physical properties, favourable biocompatibility, and well alkaline phosphatase (ALP) activity. The mean pore size was approximate 250 nm which can provide well pore channels for embedded simvastatin and collagens releases. The release profiles of the embedded drugs from the biphasic cement were studied and the 31.2% of collagenase and 34.1% of simvastatin were naturally diffused out from the cement within 4 days. The cell viability test was presented approximate 50% increase in cell proliferation after 3 days. The ALP activity proved the differentiation to osteoblasts and the value was 2.8. Therefore, we believe that this development has the high potential to be applied for the pulp therapy in the clinical dentistry.
Advisors/Committee Members: Wei-Chih Lin (committee member), Chun-Pin Lin (chair), Yung-Chiang Chung (chair).
Subjects/Keywords: Vital pulp therapy; Porous structure; Calcium phosphate cement; Calcium sulfate dihydrate; Drug delivery system
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hung, P. (2018). Development of oral materials for regenerative applications. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0108118-021621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hung, Pei-Hsuan. “Development of oral materials for regenerative applications.” 2018. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0108118-021621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hung, Pei-Hsuan. “Development of oral materials for regenerative applications.” 2018. Web. 23 Jan 2021.
Vancouver:
Hung P. Development of oral materials for regenerative applications. [Internet] [Thesis]. NSYSU; 2018. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0108118-021621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hung P. Development of oral materials for regenerative applications. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0108118-021621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – Riverside
17.
Wang, Yuan.
Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction.
Degree: Materials Science and Engineering, 2016, University of California – Riverside
URL: http://www.escholarship.org/uc/item/3f22f2bz
► Development of non-precious metal catalysts (NPMCs) has become a well-known strategy to replace the platinum-based catalysts for the oxygen reduction reactions at the cathode of…
(more)
▼ Development of non-precious metal catalysts (NPMCs) has become a well-known strategy to replace the platinum-based catalysts for the oxygen reduction reactions at the cathode of fuel cells, metal–air batteries and air-breathing cathodes in industrial electrocatalytic processes. There are two crucial factors governing the performance of carbon based catalysts. One is the intrinsic nature of the active sites which are determined by the selection of the doping elements. Another important factor is the large specific area and
porous structure feature which can introduce more active sites and promote the electrons and oxygen species transportation. Among numerous carbon-based electrode materials, hollow carbonaceous spheres have attracted attention due to the high surface-to-volume ratios and more accessible active sites on the shell. Here, hierarchical
porous carbon-nanoshells with about 40 nm cavities are synthesized by using
[email protected] core-shell structured materials as hard templates and 4, 4’-bipyridine, FeCl3 as nitrogen, carbon and iron sources. This method demonstrates outstanding stability and electrocatalytic activity for ORR. Moreover, Metal–organic frameworks (MOFs) as new classes of crystalline
porous materials with high surface area, large pore volume and uniform pore distribution can be suitable candidates as precursors and/or templates for the formation of high quality
porous carbons for ORR application. The diversity in types of metal ions and organic ligands in MOFs with cavities and pore spaces make them versatile precursors and/or templates for the synthesis of carbon/metal oxide composites and doped carbon-metal materials.Apart from the above-mentioned advantages, there are some open coordination sites on the metals species or functional groups in the ligands of the developed MOFs. Those open coordination sites can function as the specific interaction sites and be further utilized for the post-synthesis to introduce different heteroatoms with different coordination environments and different functionalities. Targeted species, like metals, heterometals and heteroatoms can be integrated into the targeted materials via different interactions to further maximize the electrocatalytic activities of the synthesized materials.
Subjects/Keywords: Materials Science; carbon-nanoshell; nanoparticles; nonprecious metal catalyst; oxygen reduction reaction; porous structure
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Wang, Y. (2016). Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/3f22f2bz
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Yuan. “Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction.” 2016. Thesis, University of California – Riverside. Accessed January 23, 2021.
http://www.escholarship.org/uc/item/3f22f2bz.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Yuan. “Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction.” 2016. Web. 23 Jan 2021.
Vancouver:
Wang Y. Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction. [Internet] [Thesis]. University of California – Riverside; 2016. [cited 2021 Jan 23].
Available from: http://www.escholarship.org/uc/item/3f22f2bz.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang Y. Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction. [Thesis]. University of California – Riverside; 2016. Available from: http://www.escholarship.org/uc/item/3f22f2bz
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kyoto University / 京都大学
18.
Kim, Jin Woong.
Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成.
Degree: 博士(工学), 2010, Kyoto University / 京都大学
URL: http://hdl.handle.net/2433/120823
;
http://dx.doi.org/10.14989/doctor.k15334
新制・課程博士
甲第15334号
工博第3213号
Subjects/Keywords: Unidirectional freezing; Freeze-drying; Porous structure
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kim, J. W. (2010). Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/120823 ; http://dx.doi.org/10.14989/doctor.k15334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kim, Jin Woong. “Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成.” 2010. Thesis, Kyoto University / 京都大学. Accessed January 23, 2021.
http://hdl.handle.net/2433/120823 ; http://dx.doi.org/10.14989/doctor.k15334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kim, Jin Woong. “Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成.” 2010. Web. 23 Jan 2021.
Vancouver:
Kim JW. Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成. [Internet] [Thesis]. Kyoto University / 京都大学; 2010. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2433/120823 ; http://dx.doi.org/10.14989/doctor.k15334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kim JW. Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying : 一方向凍結乾燥法による配向制御された多孔構造体の形成. [Thesis]. Kyoto University / 京都大学; 2010. Available from: http://hdl.handle.net/2433/120823 ; http://dx.doi.org/10.14989/doctor.k15334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Michigan
19.
Ma, Xingjian.
Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks.
Degree: PhD, Chemical Engineering, 2019, University of Michigan
URL: http://hdl.handle.net/2027.42/153364
► Covalent organic frameworks (COFs) are an emerging class of cross-linked porous crystalline polymers constructed exclusively from rigid building blocks linked together by covalent interactions. Compared…
(more)
▼ Covalent organic frameworks (COFs) are an emerging class of cross-linked
porous crystalline polymers constructed exclusively from rigid building blocks linked together by covalent interactions. Compared to conventional nanoporous materials, COFs possess a unique and highly desirable combination of attributes that are conducive to a variety of applications. Three-dimensional (3D) COFs are, in general, characterized by superior internal surface areas and pore sizes than their two-dimensional (2D) counterparts, and these two attributes are vital for many applications such as gas separation, gas storage, and catalysis. Unfortunately, 3D COFs are also significantly more difficult to construct, and the synthesis, application, and fundamental understanding of 3D COFs lag those of 2D COFs as a result. Thus, improving synthetic accessibility, practical utility, and basic understanding of 3D COFs is vital for realizing their full potential as controllable crystalline nanoporous materials.
This dissertation details the design and execution of an improved synthetic method to afford the archetypal imine-linked 3D COF-300, catalyzed by Lewis acidic scandium triflate (Sc(OTf)3), that allows the reduction of reaction temperature from 120°C to room temperature. A systematic investigation of temperature, catalyst loading, and water content as reaction variables elucidates the contribution of each factor towards the reaction equilibrium and facilitates identification of reaction conditions that result in the most crystalline framework formation, which is determined by powder X-ray diffraction (PXRD). Fourier transform infrared spectroscopy (FTIR) and Brunauer–Emmett–Teller (BET) surface area measurements confirm that COFs obtained via Sc(OTf)3 possess comparable properties as those produced by the conventional solvothermal method.
In addition, the synthesis of several functionalized aldehyde monomers is conducted utilizing a range of chemistries, and they were subsequently employed for functionalized COF-300 synthesis to embed reactive sites into the COF backbone for post-synthetic modification (PSM). The functionalized COFs are consistently amorphous despite systematic variations in reaction conditions under both solvothermal and Sc(OTf)3 catalyzed regimes, and decreasing ratios of functionalized to unfunctionalized aldehydes corresponded to increasingly crystalline frameworks. Steric hindrance is likely the culprit preventing rearrangement into crystalline structures. Lastly, the reduction of imine bonds in COF-300 to amides, multiphase synthesis of COF-300, and high-pressure transformation of COF-300 are explored as alternative methods of synthesis and functionalization.
The combination of these findings provides valuable insight into the imine formation and exchange process and tuning the equilibrium through reaction parameter adjustments, unlocking new synthetic possibilities in the field of 3D COFs via the utilization of a much more effective catalyst. In addition, the limitation of functionalized 3D COF syntheses…
Advisors/Committee Members: Scott, Timothy (committee member), Love, Brian J (committee member), Nagrath, Sunitha (committee member), Ziff, Robert M (committee member).
Subjects/Keywords: covalent organic framework; porous material; functional material; three-dimensional structure; Chemical Engineering; Engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ma, X. (2019). Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/153364
Chicago Manual of Style (16th Edition):
Ma, Xingjian. “Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks.” 2019. Doctoral Dissertation, University of Michigan. Accessed January 23, 2021.
http://hdl.handle.net/2027.42/153364.
MLA Handbook (7th Edition):
Ma, Xingjian. “Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks.” 2019. Web. 23 Jan 2021.
Vancouver:
Ma X. Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks. [Internet] [Doctoral dissertation]. University of Michigan; 2019. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2027.42/153364.
Council of Science Editors:
Ma X. Synthesis and Functionalization of Three-Dimensional Covalent Organic Frameworks. [Doctoral Dissertation]. University of Michigan; 2019. Available from: http://hdl.handle.net/2027.42/153364
Kyoto University
20.
Kim, Jin Woong.
Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
.
Degree: 2010, Kyoto University
URL: http://hdl.handle.net/2433/120823
Subjects/Keywords: Unidirectional freezing;
Freeze-drying;
Porous structure
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kim, J. W. (2010). Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
. (Thesis). Kyoto University. Retrieved from http://hdl.handle.net/2433/120823
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kim, Jin Woong. “Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
.” 2010. Thesis, Kyoto University. Accessed January 23, 2021.
http://hdl.handle.net/2433/120823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kim, Jin Woong. “Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
.” 2010. Web. 23 Jan 2021.
Vancouver:
Kim JW. Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
. [Internet] [Thesis]. Kyoto University; 2010. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2433/120823.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kim JW. Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
. [Thesis]. Kyoto University; 2010. Available from: http://hdl.handle.net/2433/120823
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
21.
Vuković, Zorica M., 1966-.
Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita.
Degree: Fakultet za fizičku hemiju, 2014, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:7721/bdef:Content/get
► Materijali - glina, kompoziti polimer/glina / Material - clay, composite polymer /clay
Smektitna glina iz domaćeg ležišta „Bogovina“, je modifikovana sa različitim koncentracijama HCl kiseline…
(more)
▼ Materijali - glina, kompoziti polimer/glina /
Material - clay, composite polymer /clay
Smektitna glina iz domaćeg ležišta „Bogovina“, je
modifikovana sa različitim koncentracijama HCl kiseline (1,5 -
7,5M). Rendgeno-difrakcionom analizom je utvrđeno prisustvo
minerala smektita i pratećih minerala kvarca, kalcita, ilita i
feldspata. Na osnovu rezultata hemijske analize, infracrvene
spektroskopije (IC), termogravimetrijske ( TG) analize utvrđeno je
da u ispitivanim uzorcima dolazi do izmene katjona već pri
koncentraciji HCl od 1,5 M. Pri modifikaciji smektita sa kiselinom
koncentracije 3 M pored katjonske izmene Na+, Ca2+ sa H+dolazi do
delimičnog narušavanja oktaedarskih slojeva u strukturi smektita.
Uzorci modifikovani kiselinom veće koncentracije pored navedenih
promena imaju i povećanu količinu prisutne amorfne faze.
Modifikacija strukture uzoraka smektita različitim koncentracijama
HCl kiseline utiče na promenu zapremine makro, mezo i mikro pora.
Suspenzionom kopolimerizacijom su sintetisani porozni kopolimeri
poli(GMA-co-EGDMA) pri različitom odnosu monomera
glicidilmetakrilata (GMA) i etilenglikoldimetakrilata (EGDMA) u
prisustvu inicijatora radikalne kopolimerizacije
azobisizobutironitrila (AIBN) i inertne komponente. Ispitan je
uticaj različitih vrsta i udela umreživača kao i udela alifatskih
alkohola u inertnoj komponenti na poroznu strukturu kopolimera. Pri
sintezi kompozita korišćena je kopolimerna matrica sa odnosom GMA i
umreživača EGDMA 60/40 i inertnom komponentom koja predstavlja
smešu cikloheksanola i tetradekanola u odnosu 4:1, uz dodatak
nemodifikovanog smektita i smektita modifikovanog 3 M HCl. Utvrđeno
da je stepen ugradnje nemodifikovanog smektita u kopolimernu
matricu znatno manji, dok je ugradnja kiselo modifikovanog smektita
skoro 2 puta efikasnija. SEM analizom su ispitana morfološka
svojstva kompozita. Pokazano je da se samo u slučaju kompozita sa
smektitom modifikovanim kiselinom dobijaju čestice koje su iste
veličine kao i kopolimerne, sa razvijenom makroporoznom strukturom.
Utvrđeno je da kompozit sa kiselim smektitom znatno poboljšava
termičku stabilnost kopolimera. Makroporozna struktura kompozita je
određena Hg-porozimetrijom i dobijeni rezultati pokazuju povećanje
specifične površine i pomeranje raspodele veličine pora ka manjim
prečnicima pora.
Advisors/Committee Members: Dondur, Vera, 1948-.
Subjects/Keywords: composite; smectite; macroporous copolymer;
poli(GMA-co-EGDMA); suspension copolymerization; modification with
acid; porous structure
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APA (6th Edition):
Vuković, Zorica M., 1. (2014). Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:7721/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vuković, Zorica M., 1966-. “Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita.” 2014. Thesis, Univerzitet u Beogradu. Accessed January 23, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:7721/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vuković, Zorica M., 1966-. “Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita.” 2014. Web. 23 Jan 2021.
Vancouver:
Vuković, Zorica M. 1. Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita. [Internet] [Thesis]. Univerzitet u Beogradu; 2014. [cited 2021 Jan 23].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7721/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vuković, Zorica M. 1. Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita. [Thesis]. Univerzitet u Beogradu; 2014. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:7721/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Adelaide
22.
Bi, Qi.
Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries.
Degree: 2020, University of Adelaide
URL: http://hdl.handle.net/2440/125043
► Lithium-oxygen (Li-O2) batteries have attracted intensive attention in last decade, due to its high theoretical energy densities and environmental benignity that satisfy the need for…
(more)
▼ Lithium-oxygen (Li-O2) batteries have attracted intensive attention in last decade, due to its high theoretical energy densities and environmental benignity that satisfy the need for large energy storage systems including electric vehicles. However, they are still in their infancy and several challenges remain to be addressed immediately. In addition to the degradation of anode and electrolyte, one of the biggest challenges is the
structure and catalytic design for oxygen electrode to achieve high capacity and long cycle life. In this thesis, size-controlled polystyrene (PS) spheres were introduced to a polydopamine derived N-doped reduced graphene (N-rGO) to explore the impact of the pore size of carbon oxygen electrodes to the performance of Li-O2 batteries. The battery containing N-rGO with 170 nm pores revealed a high specific capacity of 16777 mA h g-1, which is one of the highest among the reported carbon-based Li-O2 batteries. Field emission scanning electron microscope (FESEM) of cathode morphologies before and after discharge/charge showed that the N-rGO with 170 nm pores could hold most discharge products at a cut-off capacity of 1000 mA h g-1 without deformation to achieve a long stable cycle life. Furthermore, cobalt sulfides with controlled phases being synthesized via thermal decomposition of Co(TU)4(NO3)2 were studied as the bi-functional catalysts towards both ORR and OER of Li-O2 batteries in order to improve specific capacity and cycling life. A dual-phase cobalt sulfide prepared at 900 °C (CoS-900) contains both Co9S8 and CoS exhibited excellent ORR and OER catalytic activities with a low overvoltage (1.25 V) for Li-O2 batteries. The designated
[email protected] cathode achieved large discharge capacity at 7410 mA h g-1 with 100% charge capacity recovery as well as a super long cycle life at 108 cycles for Li-O2 battery. The excellent Li-O2 batteries performance can be attributed to the generation of both crystalline and amorphous film-like Li2O2 that effectively improve ORR/OER kinetics of Li-O2 batteries. Finally, Co9S8 nanoparticles were anchored to N, S co-doped graphene to form leave-like Co9S8/N, S-GO composites through hydrothermal treatment. The composite was further optimized by adjusting cobalt sulfide precursor amount to achieve an improvement of battery performance. As a result, the Li-O2 battery with Co9S8/N, S-GO composite can achieve a 100% recoverable high discharge capacity at 4884 mA h g-1 and a stable cycle life. The thesis systematically explored the relationship between the structures of oxygen electrode and electrochemical performance of Li-O2 batteries, including surface
structure, heteroatom doping and cobalt sulphide hybridization. The outcomes provide new perspectives for the future development of high-performance Li-O2 batteries by strategically designing ORR/OER catalysts.
Advisors/Committee Members: Dai, Sheng (advisor), Wang, Haihui (advisor), School of Chemical Engineering (school).
Subjects/Keywords: Lithium-oxygen battery; electrocatalyst; porous structure; dual-phase cobalt sulfide; cobalt sulfide-graphene composites
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Bi, Q. (2020). Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/125043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bi, Qi. “Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries.” 2020. Thesis, University of Adelaide. Accessed January 23, 2021.
http://hdl.handle.net/2440/125043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bi, Qi. “Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries.” 2020. Web. 23 Jan 2021.
Vancouver:
Bi Q. Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries. [Internet] [Thesis]. University of Adelaide; 2020. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2440/125043.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bi Q. Development of High-performance Cathodic Catalysts for Non-Aqueous Lithium-Oxygen Batteries. [Thesis]. University of Adelaide; 2020. Available from: http://hdl.handle.net/2440/125043
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
23.
Chao, Yunfeng.
Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries.
Degree: PhD, 2020, University of Wollongong
URL: 0303
MACROMOLECULAR
AND
MATERIALS
CHEMISTRY
;
https://ro.uow.edu.au/theses/4978
► The rapid development of personalized, portable and wearable electronic devices calls for high performance lithium-ion batteries (LIBs). Molybdenum disulfide (MoS2), a representative two-dimensional (2D)…
(more)
▼ The rapid development of personalized, portable and wearable electronic devices calls for high performance lithium-ion batteries (LIBs). Molybdenum disulfide (MoS2), a representative two-dimensional (2D) transition metal dichalcogenides (TMDs) material, is a promising anode material with a high theoretical capacity of 670 mAh g-1. However, it suffers from low conductivity, restacking problem and volume changes that limit its commercial application. The goal of this thesis is to develop high-performance porous MoS2/carbon materials (MC) anodes for LIBs, by applying the strategies of creating a 3D porous structure and incorporating with carbon materials. A 3D porous structure with large surface area can not only facilitate electrolyte ions diffusion but also accommodate the volume changes of MoS2. The incorporated carbon materials are able to separate MoS2 layers thus suppressing their restacking problem as well as act as fast electrons pathways with an enhanced conductivity. The excellent mechanical properties of carbon materials also facilitate the realization of good flexibility in MC film electrodes for flexible batteries.
In this thesis, two types of materials, MoS2/nitrogen-doped carbon nanotubes (MoS2/CNT) nanocomposites and freestanding flexible MoS2/reduced graphene oxide (MoS2/rGO) films, have been developed. Polypyrrole (PPy) and liquid crystalline graphene oxide (LCGO) are employed as the carbon sources to produce nitrogen-doped carbon and rGO for their incorporation with MoS2, respectively. Combined with the created 3D porous structures, these MC composites all demonstrate a greatly improved electrochemical performance. Most importantly, a facial LCGO-based self-assembly process is developed for fabricating freestanding, flexible and porous MoS2/rGO films.
Subjects/Keywords: Lithium ion batteries; Molybdenum disulfide; Carbon materials; Free-standing films; Porous structure
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APA ·
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APA (6th Edition):
Chao, Y. (2020). Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries. (Doctoral Dissertation). University of Wollongong. Retrieved from 0303 MACROMOLECULAR AND MATERIALS CHEMISTRY ; https://ro.uow.edu.au/theses/4978
Chicago Manual of Style (16th Edition):
Chao, Yunfeng. “Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries.” 2020. Doctoral Dissertation, University of Wollongong. Accessed January 23, 2021.
0303 MACROMOLECULAR AND MATERIALS CHEMISTRY ; https://ro.uow.edu.au/theses/4978.
MLA Handbook (7th Edition):
Chao, Yunfeng. “Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries.” 2020. Web. 23 Jan 2021.
Vancouver:
Chao Y. Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries. [Internet] [Doctoral dissertation]. University of Wollongong; 2020. [cited 2021 Jan 23].
Available from: 0303 MACROMOLECULAR AND MATERIALS CHEMISTRY ; https://ro.uow.edu.au/theses/4978.
Council of Science Editors:
Chao Y. Molybdenum Disulfide/Carbon Composites for Lithium Ion Batteries. [Doctoral Dissertation]. University of Wollongong; 2020. Available from: 0303 MACROMOLECULAR AND MATERIALS CHEMISTRY ; https://ro.uow.edu.au/theses/4978
University of Toronto
24.
Zuliani, Jocelyn Ellen.
Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors.
Degree: PhD, 2017, University of Toronto
URL: http://hdl.handle.net/1807/80707
► Electrical energy storage is a limiting barrier to widespread usage and commercialization of sustainable and renewable energy sources, such as wind and solar energy, as…
(more)
▼ Electrical energy storage is a limiting barrier to widespread usage and commercialization of sustainable and renewable energy sources, such as wind and solar energy, as well as integration of electric vehicles. Electrochemical double-layer capacitors (EDLCs) are a promising energy storage technology that offers the benefits of high power density, long cycle life, rapid charging rates, and moderate energy density. The energy storage mechanism of EDLCs is physical ion adsorption on the surface of
porous carbon electrodes. This thesis is an investigation of three different sections relating to EDLCs: 1) techniques to properly characterize novel
porous carbon electrode materials, 2) investigation of activated oil sands petroleum coke (APC) as the electrode material for EDLCs, and 3) a systematic study of the effects of
porous carbon
structure and chemistry on EDLC performance. In the first section, it was shown that variations in operating conditions and testing techniques can lead to discrepancies in measured and reported capacitance. Therefore, it was concluded that a standardized approach is necessary in order to properly compare different
porous carbon electrodes. In the second section, APC was investigated as a novel electrode material for EDLCs. PetCoke is a carbon dense material that can be activated with potassium hydroxide to generate high surface area
porous carbon materials. These materials show promising electrochemical performance in EDLCs, with capacitance values up to 400 Fg-1 in 4M potassium hydroxide aqueous electrolytes, depending on the operating conditions. Additionally, the power density of these materials is comparable to that of other carbon nanomaterials, which are more costly and challenging to produce. Finally, the third section investigates the relationship between measured capacitance, and carbon macrostructure, meso-
structure, microstructure, and oxygen content. In each of these studies, the desired parameter was varied, while all others (surface area, pore size, chemistry) were maintained constant. Through this systematic approach, this thesis investigates and quantifies the relationship between EDLC performance and important characteristic parameters through isolation of each individual parameter. By understanding the key structural and chemical features that improve EDLC performance, focus can be placed on engineering a sustainable and economic
porous carbon material that has these desired features.
Advisors/Committee Members: Jia, Charles Q, Kirk, Donald W, Chemical Engineering Applied Chemistry.
Subjects/Keywords: Electrical Doube Layer; Energy Storage; Oil Sands Petroleum Coke; Pore Structure; Porous Carbon; Supercapacitors; 0542
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zuliani, J. E. (2017). Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/80707
Chicago Manual of Style (16th Edition):
Zuliani, Jocelyn Ellen. “Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors.” 2017. Doctoral Dissertation, University of Toronto. Accessed January 23, 2021.
http://hdl.handle.net/1807/80707.
MLA Handbook (7th Edition):
Zuliani, Jocelyn Ellen. “Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors.” 2017. Web. 23 Jan 2021.
Vancouver:
Zuliani JE. Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors. [Internet] [Doctoral dissertation]. University of Toronto; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1807/80707.
Council of Science Editors:
Zuliani JE. Effect of Pore Structure and Chemistry on the Performance of Activated Oil Sands Petroleum Coke Electrodes for use in Electrochemical Double-Layer Capacitors. [Doctoral Dissertation]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/80707
Brno University of Technology
25.
Bačová, Veronika.
Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/14352
► The work deals with finding suitable conditions for nanoporous structure on aluminium foil. The work describes the nanopororous structur creation process and its preparation. The…
(more)
▼ The work deals with finding suitable conditions for nanoporous
structure on aluminium foil. The work describes the nanopororous structur creation process and its preparation. The diameter of the created pores was 5 to 20 nm. The current density dependence on applied voltage pulse was observed. All the results were analyzed with SEM analysis. For the determination of reduction potential of nickel and gold the Cyclic Voltammetry was used.
Advisors/Committee Members: Hubálek, Jaromír (advisor), Magát, Martin (referee).
Subjects/Keywords: pulzní anodizace; pórovitá struktura; elektrodepozice; oxid hlinitý; pulse anodization; porous structure; electrodepozition; alumina
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APA ·
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APA (6th Edition):
Bačová, V. (2019). Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/14352
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bačová, Veronika. “Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation.” 2019. Thesis, Brno University of Technology. Accessed January 23, 2021.
http://hdl.handle.net/11012/14352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bačová, Veronika. “Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation.” 2019. Web. 23 Jan 2021.
Vancouver:
Bačová V. Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/11012/14352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bačová V. Pulsní anodizace hliníku pro vytváření nanoporézních struktur: Pulse anodization of aluminium for nanoporous structures creation. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/14352
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Deville, Lilas.
Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals.
Degree: Docteur es, Génie mécanique, productique, transport, 2016, Poitiers
URL: http://www.theses.fr/2016POIT2326
► Les joints à brosse sont des joints compliants utilisés dans les turbomachines. Ils sont constitués d'une brosse de fils très fins compactés entre deux plaques,…
(more)
▼ Les joints à brosse sont des joints compliants utilisés dans les turbomachines. Ils sont constitués d'une brosse de fils très fins compactés entre deux plaques, de telle manière que l'ensemble comble l'écart séparant le stator du rotor. Les fils sont le plus souvent constitués d'un alliage à base de cobalt appelé Haynes 25 (d'autres matériaux peuvent être utilisés, tels que le Kevlar). Le comportement de ces joints présente un fort couplage entre l'écoulement du fluide et la déformation de la brosse. Ce type de joints peut être modélisé en considérant la brosse comme un milieu poreux. Cette méthode présente l'avantage de permettre un calcul relativement simple de l'écoulement, mais elle demande l'usage de données expérimentales afin de calibrer ses perméabilités (i.e. sa capacité à laisser un fluide s'écouler à travers lui). L'objectif de cette thèse est de proposer une modélisation par milieu poreux indépendante des données expérimentales. Une simulation itérative entre le calcul de la déformation des fils sous l'action des efforts de pression et la résolution de l'écoulement dans le milieu poreux formé par la brosse déformée a été mise au point. Elle repose sur le calcul numérique des perméabilités obtenues à partir de la perte de charge générée par un réseau de cylindres représentatifs de la brosse.Des joints de faible diamètre en Haynes 25 ont été testés avec de l'air afin de vérifier la validité des résultats donnés par la simulation. L'évolution du débit avec la différence de pression et avec l'interférence des joints avec le rotor a été étudiée. Les déplacements du rotor et la température des joints ont été suivis durant les essais.
Brush seals are compliant dynamic seals that are used in the turbomachines. They are made of a brush of fine bristles sandwiched between two plates, in such a way that the assembly fills the gap between the rotor and the stator. The bristles are usually made from a cobalt based alloy called Haynes 25 (other materials can be used, such as Kevlar). The behaviour of these seals shows a strong coupling between the fluid flow and the brush deformation.This kind of seal can be modelled by considering the brush as a porous medium. This method presents the benefit of a rather simple calculation of the flow, but it requires the use of experimental data in order to calibrate its permeabilities (i.e. its ability to let the fluid flow through it). The aim of this thesis is to propose a model using the porous medium approach but without the need of preliminary experimental data. An iterative simulation between the calculation of the bristles' deformation under the influence of the pressure forces and the solving of the flow in the porous medium formed by the deformed brush was developed. It relies on the numerical calculation of the permeabilities obtained from the pressure drop generated by an array of cylinders representative of the brush.Low diameter Haynes 25 seals were tested with air in order to verify the validity of the results given by the simulation. The evolution of the mass flow…
Advisors/Committee Members: Arghir, Mihaï (thesis director).
Subjects/Keywords: Joint à brosse; Couplage fluide-Structure; Écoulement milieu poreux; Perméabilités; Brush seal; Fluid-Structure interaction; Porous media flow; Permeability; 621.82
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Deville, L. (2016). Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2016POIT2326
Chicago Manual of Style (16th Edition):
Deville, Lilas. “Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals.” 2016. Doctoral Dissertation, Poitiers. Accessed January 23, 2021.
http://www.theses.fr/2016POIT2326.
MLA Handbook (7th Edition):
Deville, Lilas. “Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals.” 2016. Web. 23 Jan 2021.
Vancouver:
Deville L. Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals. [Internet] [Doctoral dissertation]. Poitiers; 2016. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2016POIT2326.
Council of Science Editors:
Deville L. Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals. [Doctoral Dissertation]. Poitiers; 2016. Available from: http://www.theses.fr/2016POIT2326
NSYSU
27.
Tsai, Hong-Ming.
Study on ultra low-k silicon oxide with nano-porous structure.
Degree: Master, Physics, 2002, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708102-111915
► In this thesis, the leakage-mechanism after O2-plasma treatments was investigated. And the mechanism is transformed from Schottky emission into ionic conduction due to moisture uptake…
(more)
▼ In this thesis, the leakage-mechanism after O2-plasma treatments was investigated. And the mechanism is transformed from Schottky emission into ionic conduction due to moisture uptake after
porous silica film undergoes O2 plasma ashing. Besides, CMP process can to recover the damaged films by removed the degraded parts. From the result, we know that O2 plasma causing the bulky damage. Finally, the resistance of metal penetration of O2 plasma treated POSG is performed by utilizing BTS test. It was found that the moisture uptake in POSG films assisting metals in ionization process. Then, the penetrated metal ions in POSG film causes the leaky characters degraded.
Advisors/Committee Members: Ting-Chang Chang (committee member), Chao-Hsin Chien (chair), Chin-Fu Liu (chair), Po-Tsun Liu (chair), Dong-Po Wang (chair).
Subjects/Keywords: low-k; low dielectric constant; copper; nano-structure; porous
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APA (6th Edition):
Tsai, H. (2002). Study on ultra low-k silicon oxide with nano-porous structure. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708102-111915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tsai, Hong-Ming. “Study on ultra low-k silicon oxide with nano-porous structure.” 2002. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708102-111915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tsai, Hong-Ming. “Study on ultra low-k silicon oxide with nano-porous structure.” 2002. Web. 23 Jan 2021.
Vancouver:
Tsai H. Study on ultra low-k silicon oxide with nano-porous structure. [Internet] [Thesis]. NSYSU; 2002. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708102-111915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tsai H. Study on ultra low-k silicon oxide with nano-porous structure. [Thesis]. NSYSU; 2002. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708102-111915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
28.
Nissam, E.
Catalysis by Modified Pillared Clays and Porous Clay Heterostructures.
Degree: 2014, Cochin University of Science and Technology
URL: http://dyuthi.cusat.ac.in/purl/4977
► In this venture three distinct class of catalysts such as, pillared clays and transition metal loaded pillared clays , porous clay heterostructures and their transition…
(more)
▼ In this venture three distinct class of catalysts such as, pillared clays and
transition metal loaded pillared clays , porous clay heterostructures and their
transition metal loaded analogues and DTP supported on porous clay
heterostructures etc. were prepared and characterized by various physico chemical
methods. The catalytic activities of prepared catalysts were comparatively
evaluated for the industrially important alkylation, acetalization and oxidation
reactions.The general conclusions drawn from the present investigation are
Zirconium, iron - aluminium pillared clays were synthesized by ion
exchange method and zirconium-silicon porous heterostructures were
Summary and conclusions
259
prepared by intergallery template method. Transition metals were loaded
in PILCs and PCHs by wet impregnation method.
Textural and acidic properties of the clays were modified by pillaring
and post pillaring modifications.
The shift in 2θ value to lower range and increase in d (001) spacing
indicate the success of pillaring process.
Surface area, pore volume, average pore size etc. increased dramatically
as a result of pillaring process.
Porous clay heterostructures have higher surface area, pore volume,
average pore diameter and narrow pore size distribution than that of
pillared clays.
The IR spectrum of PILCs and PCHs are in accordance with literature
without much variation compared to parent montmorillonite which
indicate that basic clay structure is retained even after modification.
The silicon NMR of PCHs materials have intense peaks corresponding
to Q4 environment which indicate that mesoporous silica is incorporated
between clay layers.
Thermo gravimetric analysis showed that thermal stability is improved
after the pillaring process. PCH materials have higher thermal stability
than PILCs.
In metal loaded pillared clays, up to 5% metal species were uniformly
dispersed (with the exception of Ni) as evident from XRD and TPR
analysis.
Chapter 9
260
Impregnation of transition metals in PILCs and PCHs enhanced acidity
of catalysts as evident from TPD of ammonia and cumene cracking
reactions.
For porous clay heterostructures the acidic sites have major contribution
from weak and medium acid sites which can be related to the Bronsted
sites as evident from TPD of ammonia.
Pillared clays got more Lewis acidity than PCHs as inferred from α-
methyl styrene selectivity in cumene cracking reaction.
SEM images show that layer structure is preserved even after modification.
Worm hole like morphology is observed in TEM image of PCHs materials
In ZrSiPCHS, Zr exists as Zr 4+ and is incorporated to silica pillars in the
intergallary of clay layers as evident from XPS analysis.
In copper loaded zirconium pillared clays, copper exists as isolated species
with +2 oxidation state at lower loading. At higher loading, Cu exists as
clusters as evident from reduction peak at higher temperatures in TPR.
In vanadium incorporated PILCs and PCHs, vanadium exist as isolated
V5+ in tetrahedral coordination which is…
Subjects/Keywords: Structure of Clays; Properties of clays; Modification in clays; Pillared clays; Porous clay heterostructures; Catalysis by modified pillared clays
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APA (6th Edition):
Nissam, E. (2014). Catalysis by Modified Pillared Clays and Porous Clay Heterostructures. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/4977
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nissam, E. “Catalysis by Modified Pillared Clays and Porous Clay Heterostructures.” 2014. Thesis, Cochin University of Science and Technology. Accessed January 23, 2021.
http://dyuthi.cusat.ac.in/purl/4977.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nissam, E. “Catalysis by Modified Pillared Clays and Porous Clay Heterostructures.” 2014. Web. 23 Jan 2021.
Vancouver:
Nissam E. Catalysis by Modified Pillared Clays and Porous Clay Heterostructures. [Internet] [Thesis]. Cochin University of Science and Technology; 2014. [cited 2021 Jan 23].
Available from: http://dyuthi.cusat.ac.in/purl/4977.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nissam E. Catalysis by Modified Pillared Clays and Porous Clay Heterostructures. [Thesis]. Cochin University of Science and Technology; 2014. Available from: http://dyuthi.cusat.ac.in/purl/4977
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Missouri – Kansas City
29.
Adhikari, Puja.
Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals.
Degree: PhD, 2020, University of Missouri – Kansas City
URL: http://hdl.handle.net/10355/73989
► Zeolitic imidazolate frameworks (ZIFs) are a rapidly emerging class of versatile porous material with many potential applications. Here, we report the construction of an amorphous…
(more)
▼ Zeolitic imidazolate frameworks (ZIFs) are a rapidly emerging class of versatile
porous material with many potential applications. Here, we report the construction of an amorphous ZIF (a-ZIF) model from a near-perfect continuous random network model of a-SiO₂. The radial distribution function is in good agreement with measurements for amorphous aTZIF-4 but with notable fine differences. We confirm the retention of the metal tetrahedral bonding coordination in a-ZIF and the nearly identical short range ordering found in crystalline ZIFs (ZIF-4, ZIF-zni, and ZIF-8). Zn-N bond strength plays a key role in retaining the tetrahedrally bonded network
structure. In addition, we studied deformation behavior of this unique a-ZIF model by simulating step-wise compression and expansion with strains between -0.389 and +0.376. An insulator-to-metal transition is observed at 51 GPa leading to a multicomponent light amorphous alloy of only 3.68 g/(cm)³. A high-density amorphous-to-amorphous phase transition is observed due to the sudden formation of N-N bond pairs. Systematic expansion of a-ZIF retains the framework softness until it fractures at high strain. Based on the expansion data, we propose an empirical formula for super-soft materials, which is in line with available experimental data.
The electronic
structure, mechanical and optical properties of five pyrophosphate crystals with very complex structures are studied. Existing structures from single-crystal X-ray diffraction shows short O-H bonds, which are rectified by density functional theory (DFT) calculations. The complex interplay of the minor differences in specific local structures and compositions are discussed by dividing the pyrophosphate crystals into three structural units. H₂P₂O₇ is the most important and dominating unit in pyrophosphates. The other two are the influential cationic group with metals and water molecules. The strongest P-O bond in P₂O₅ is the strongest bond for crystal cohesion, but O-H, N-H bonds also play an important part. Different type of bonding between O and H atoms such as O-H, hydrogen bonding and bridging bonds are present. Metallic cations such as Mg, Zn and Cu form octahedral bonding with O. Metallic elements can influence the
structure and bonding to certain extent. The two Cu-containing phosphates show the presence of narrow metallic bands near the valence band edge. All these complex bonding affects their physical properties indicating that the fundamental understanding remains an open question.
Advisors/Committee Members: Ching, Wai-Yim (advisor).
Subjects/Keywords: Porous materials; Pyrophosphates; Zeolites; Electronic structure; Dissertation – University of Missouri – Kansas City – Physics; Dissertation – University of Missouri – Kansas City – Chemistry
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Adhikari, P. (2020). Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals. (Doctoral Dissertation). University of Missouri – Kansas City. Retrieved from http://hdl.handle.net/10355/73989
Chicago Manual of Style (16th Edition):
Adhikari, Puja. “Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals.” 2020. Doctoral Dissertation, University of Missouri – Kansas City. Accessed January 23, 2021.
http://hdl.handle.net/10355/73989.
MLA Handbook (7th Edition):
Adhikari, Puja. “Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals.” 2020. Web. 23 Jan 2021.
Vancouver:
Adhikari P. Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals. [Internet] [Doctoral dissertation]. University of Missouri – Kansas City; 2020. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10355/73989.
Council of Science Editors:
Adhikari P. Ab Initio Study of Amorphous Zeolitic Imidazolate
Framework (A-ZIF) and Pyrophosphate crystals. [Doctoral Dissertation]. University of Missouri – Kansas City; 2020. Available from: http://hdl.handle.net/10355/73989
30.
Cláudia Renata Borges Miranda.
Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso.
Degree: 2005, Instituto Nacional de Pesquisas Espaciais
URL: http://urlib.net/sid.inpe.br/[email protected]/2005/04.28.12.32
► This work investigates by the first time PbTe films growth on porous silicon substrate by electrodeposition technique. It was studied porous silicon layer obtained from…
(more)
▼ This work investigates by the first time PbTe films growth on porous silicon substrate by electrodeposition technique. It was studied porous silicon layer obtained from stain etching by using a HF:HNO3 mixtures at different etching times between 1 and 10 min. Surface morphology analyzed by scanning electron microscopy (SEM) has evidenced Si nanocrystallites and columnar porous, which are characteristics of the etched p+ (100) silicon wafers. The samples presented a non uniform porous distribution and two crystallites average size may be associated. In deed, SEM images reveal a surface fractal structure that increases its non homogeneity as the etching time increases. The crystallite average size increases, but two maximum peaks are well defined in this etching range correlated to an oscillatory behavior of such morphology. The photoluminescence (PL) response, measured from Raman scattering spectroscopy, shows a PL intensity increases as a function of the etching time up to a maximum at 7 min. For etching times of 8, 9 and 10 min this behavior is reversed. This effect can be explained due to the possible porous layer damage that can peel off on the surface for strong etching. In this case, the etching process is in progress again by forming a second porous layer. The process reproducibly was also studied for different samples sets, produced in similar experimental procedure, from MEV and PL measurements. The relative intensity Irel (PL/Si peak) for different samples sets have shown the same physical characteristics, resulting from similar structures, where the same maximum and minimum points are observed as a function of the etching time. PbTe films were electrodeposited from aqueous alkaline solutions of Pb(CH3COO)2, disodium salt of ethylendiaminetetraacetic acid (EDTA) and TeO2 by galvanostatic method with current density in the range of 0.14 up to 0.20 mA/cm2, or by potentiostatic growth process in the potencial range between -1.0 and -0.8 V x Ag/AgCl. It was obtained nanostructured thin films with polycrystalline morphology, average grain size of 100 nm and thickness between 100 up to 400 nm, observed from topographic and cross section SEM images, respectively. The x-ray spectra confirm the polycrystalline structure for films grown on monocristalline Si and porous silicon substrates, formed in the etching time between 1 and 5 min. PbTe peaks of (200), (220), (222) e (400) are presented besides the Pb peak. This peak is attributed to the high negative potential for electrodepositing PbTe is also favorable for Pb deposition. Thus, the deposition potential control influences the film stoichiometry, which is not affected by small variations of the film precursors.
Este trabalho investiga pela primeira vez o crescimento de filmes de Telureto de Chumbo (PbTe) sobre Si-poroso pela técnica de eletrodeposição. Foram estudadas camadas de Si-poroso nanoestruturadas obtidas por ataque químico a partir de uma solução de HF: HNO3 em diferentes tempos de ataque entre 1 e 10 min. A morfologia superficial em escala nanométrica…
Advisors/Committee Members: Antônio Fernando Beloto, Neidenei Gomes Ferreira, Francisco Cristovão Lourenço de Melo.
Subjects/Keywords: semicondutores; photoluminescence; nanocrystalline structure; electroless deposition; electrochemical cells; porous silicon; semiconductors; fotoluminescência; estrutura nanocristalina; deposição eletrolítica; célula eletroquímica; silício poroso
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
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Manager
APA (6th Edition):
Miranda, C. R. B. (2005). Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso. (Thesis). Instituto Nacional de Pesquisas Espaciais. Retrieved from http://urlib.net/sid.inpe.br/[email protected]/2005/04.28.12.32
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Miranda, Cláudia Renata Borges. “Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso.” 2005. Thesis, Instituto Nacional de Pesquisas Espaciais. Accessed January 23, 2021.
http://urlib.net/sid.inpe.br/[email protected]/2005/04.28.12.32.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miranda, Cláudia Renata Borges. “Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso.” 2005. Web. 23 Jan 2021.
Vancouver:
Miranda CRB. Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso. [Internet] [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2005. [cited 2021 Jan 23].
Available from: http://urlib.net/sid.inpe.br/[email protected]/2005/04.28.12.32.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miranda CRB. Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso. [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2005. Available from: http://urlib.net/sid.inpe.br/[email protected]/2005/04.28.12.32
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations