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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, 2020.
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 2020.
Vancouver:
Huang P. Study on Wave Field with Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2020 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, 2020.
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 2020.
Vancouver:
Wang Y. Reconstruction of high-resolution pore structures from micro-tomography images. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2020 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, 2020.
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 2020.
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 2020 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/ ;
4.
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 (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, 2020.
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 2020.
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 2020 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
NSYSU
5.
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, 2020.
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 2020.
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 2020 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
6.
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, 2020.
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 2020.
Vancouver:
Τσακίρογλου . Βελτιωμένη μέθοδος ανάλυσης της πορώδους δομής διαπερατών στερεών: εφαρμογή σε ελληνικά πετρελαιοφόρα πετρώματα. [Internet] [Doctoral dissertation]. University of Patras; 1990. [cited 2020 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
7.
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, 2020.
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 2020.
Vancouver:
Sousa MBNd. Smart macroporous structures for the purification of viral particles. [Internet] [Thesis]. Universidade Nova; 2014. [cited 2020 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
UCLA
8.
Chu, Tawei.
Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging.
Degree: Materials Science and Engineering, 2018, UCLA
URL: http://www.escholarship.org/uc/item/7t58777j
► This thesis presents a study on the formation mechanism of porous Cu3Sn intermetallic compounds in microbumps for 3D-IC packaging, which are issues of importance to…
(more)
▼ This thesis presents a study on the formation mechanism of porous Cu3Sn intermetallic compounds in microbumps for 3D-IC packaging, which are issues of importance to the packaging technology in microelectronic industry. Experimental emphases are on the formation processes of porous Cu3Sn under current stressing and by solid state aging. Theoretical interpretations of the observations are also presented. Following a background introduction, we first report the results on electromigration tests of SnAg solder bump samples with 15 �m bump height and Cu under-bump-metallization (UBM). The test conditions were 1.45 �104 A/cm2 at 185 °C and 1.20 �104 A/cm2 at 0 °C. A porous Cu3Sn intermetallic compound (IMC) structure was observed to form within the bumps after several hundred hours of current stressing. In direct comparison, annealing alone at 185 °C will take more than 1000 h for porous Cu3Sn to form, and it will not form at 170 °C even after 2000 h. A mechanism is proposed to explain the formation of this porous structure assisted by electromigration. The results show that the SnAg bump with low bump height will become porous-type Cu3Sn when stressing with high current density and high temperature. Polarity effects on porous Cu3Sn formation is also examined and interpreted.The second part of the experimental study is on the growth competition between the co-existing layer-type and porous-type Cu3Sn in solder microbumps of Cu/SnAg/Cu. The thickness of the SnAg solder is about 14 μm and the Cu column on both sides is 20 μm. Upon wetting-reflow, the solder is reacted completely to form Cu-Sn intermetallic compounds in a multi-layered structure of Cu/Cu3Sn/Cu6Sn5/Cu3Sn/Cu. Upon further annealing at 220 �C and 260 �C, we obtain Cu/Cu3Sn/porous Cu3Sn/Cu3Sn/Cu, in which both types of Cu3Sn co-exist and form an interface. In the layer-type growth, we assume Cu to be the dominant diffusing species, coming from the Cu column. The Cu reacts with Cu6Sn5 to grow the Cu3Sn layer. In the porous-type growth, we assume Sn to be the dominant diffusing species, coming from the depletion of Sn in Cu6Sn5. The depleted Cu6Sn5 transforms to the porous-type Cu3Sn. At the same time, the Sn diffuses to the side-wall of Cu column to form a coating of Cu3Sn. Experimental observations of 3-dimensional distribution of voids in the porous-type Cu3Sn are performed by synchrotron radiation tomography; the voids are interconnected for the out-diffusion of Sn. The competing growth between the layer-type and the porous-type Cu3Sn is analyzed.Lastly, for a theoretical understanding, we discuss the mechanism of this unique porous void formation in microbumps, including the necessary and sufficient conditions of porous Cu3Sn formation and a comparison between incomplete and complete cellular precipitations.
Subjects/Keywords: Materials Science; 3DIC; Intermetallics; Porous Structure; Semiconductor Packaging
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APA (6th Edition):
Chu, T. (2018). Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/7t58777j
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):
Chu, Tawei. “Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging.” 2018. Thesis, UCLA. Accessed January 23, 2020.
http://www.escholarship.org/uc/item/7t58777j.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chu, Tawei. “Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging.” 2018. Web. 23 Jan 2020.
Vancouver:
Chu T. Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging. [Internet] [Thesis]. UCLA; 2018. [cited 2020 Jan 23].
Available from: http://www.escholarship.org/uc/item/7t58777j.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chu T. Formation Mechanism of Porous Cu3Sn Intermetallic Compounds in Microbumps for 3D-IC Packaging. [Thesis]. UCLA; 2018. Available from: http://www.escholarship.org/uc/item/7t58777j
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Commonwealth University
9.
Zhao, Bo.
Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication.
Degree: PhD, Chemistry, 2012, Virginia Commonwealth University
URL: 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 ·
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Manager
APA (6th Edition):
Zhao, B. (2012). Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication. (Doctoral Dissertation). Virginia Commonwealth University. Retrieved from 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, 2020.
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 2020.
Vancouver:
Zhao B. Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication. [Internet] [Doctoral dissertation]. Virginia Commonwealth University; 2012. [cited 2020 Jan 23].
Available from: 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://scholarscompass.vcu.edu/etd/303
University of North Texas
10.
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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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 ·
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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, 2020.
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 2020.
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 2020 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
RMIT University
12.
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 ·
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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, 2020.
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 2020.
Vancouver:
Song T. Dealloying of Al-based alloys and their mechanisms. [Internet] [Thesis]. RMIT University; 2015. [cited 2020 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
Kyoto University / 京都大学
13.
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 ·
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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, 2020.
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 2020.
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 2020 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
NSYSU
14.
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 (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, 2020.
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 2020.
Vancouver:
Hung P. Development of oral materials for regenerative applications. [Internet] [Thesis]. NSYSU; 2018. [cited 2020 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
15.
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 (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, 2020.
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 2020.
Vancouver:
Wang Y. Development of New Generation Eletrocatalysts for the Oxygen Reduction Reaction. [Internet] [Thesis]. University of California – Riverside; 2016. [cited 2020 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
Clemson University
16.
Kothala, Venkat Sai Kumar.
Use of Image Analysis as a Tool for Evaluating Various Construction Materials.
Degree: MS, Civil Engineering, 2018, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2855
► Characterization of internal structure is necessary to understand the behavior of construction materials under different conditions. Image analysis possesses the technological advantages to better understand…
(more)
▼ Characterization of internal
structure is necessary to understand the behavior of construction materials under different conditions. Image analysis possesses the technological advantages to better understand construction materials and it also provides information that can help to improve the properties of various construction materials. The purpose of this study was to evaluate the internal
structure of various construction materials using image analysis and investigate the infiltration in
porous friction course mixtures using thermal image analysis. Automated image processing algorithms were developed to determine the a) long-term binder draindown in asphalt mixtures over time, b) roughness of asphalt mixtures, c) fiber distribution in ultra-high performance concrete mixtures, and d) amount of unreacted ground glass fiber (GGF) particles in geopolymers. Although, the image analysis results did not compare numerically with measured results in the first two studies (a and b), the accuracy can be improved through calibration. In the other two studies (c and d), image analysis provided accurate measurements of the desired information, which can be used to help alter the composition of the materials to improve the performance. Results also helped to analyze the internal
structure thus improving the ability to understand the behavior of construction materials. To simulate and monitor difficult to detect observations in full scale, a study was also conducted on pervious concrete friction course mixtures to evaluate infiltration and lateral internal flow of water using thermal image analysis. The internal spread of infiltrated water was detected using thermal image analysis and the effect of slope and thickness on infiltration was analyzed based on various parameters. Results were shown to be repeatable and enhanced the importance of using this non-destructive, cost effective and a time efficient approach.
Advisors/Committee Members: Dr. Bradley J Putman, Committee Chair, Dr. Prasad Rao Rangaraju, Dr. Amir Poursaee.
Subjects/Keywords: Air void; Asphalt binder; Image analysis; Internal structure; Porous friction course mixtures; Thermal imaging
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MLA ·
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APA (6th Edition):
Kothala, V. S. K. (2018). Use of Image Analysis as a Tool for Evaluating Various Construction Materials. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2855
Chicago Manual of Style (16th Edition):
Kothala, Venkat Sai Kumar. “Use of Image Analysis as a Tool for Evaluating Various Construction Materials.” 2018. Masters Thesis, Clemson University. Accessed January 23, 2020.
https://tigerprints.clemson.edu/all_theses/2855.
MLA Handbook (7th Edition):
Kothala, Venkat Sai Kumar. “Use of Image Analysis as a Tool for Evaluating Various Construction Materials.” 2018. Web. 23 Jan 2020.
Vancouver:
Kothala VSK. Use of Image Analysis as a Tool for Evaluating Various Construction Materials. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2020 Jan 23].
Available from: https://tigerprints.clemson.edu/all_theses/2855.
Council of Science Editors:
Kothala VSK. Use of Image Analysis as a Tool for Evaluating Various Construction Materials. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/2855
Univerzitet u Beogradu
17.
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 ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
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, 2020.
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 2020.
Vancouver:
Vuković, Zorica M. 1. Modifikacija porozne strukture Ca-smektita, kopolimera
glicidilmetakrilata i njihovih kompozita. [Internet] [Thesis]. Univerzitet u Beogradu; 2014. [cited 2020 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
Kyoto University
18.
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
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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
. (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, 2020.
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 2020.
Vancouver:
Kim JW. Preparation of Porous Materials with Aligned Pores by Unidirectional Freezing and Freeze-Drying
. [Internet] [Thesis]. Kyoto University; 2010. [cited 2020 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
19.
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 ·
Chicago ·
MLA ·
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CSE |
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, 2020.
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 2020.
Vancouver:
Deville L. Modélisation et caractérisation expérimentale des joints à brosse : Modelling and experimental characterization of brush seals. [Internet] [Doctoral dissertation]. Poitiers; 2016. [cited 2020 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
20.
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 ·
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Manager
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, 2020.
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 2020.
Vancouver:
Nissam E. Catalysis by Modified Pillared Clays and Porous Clay Heterostructures. [Internet] [Thesis]. Cochin University of Science and Technology; 2014. [cited 2020 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 Newcastle Upon Tyne
21.
Jia, Yong Feng.
Adsorption of heavy metal ion species from aqueous solution in activated carbon.
Degree: PhD, 2000, University of Newcastle Upon Tyne
URL: http://hdl.handle.net/10443/519
► Activated carbons are used widely for the adsorption of environmentally unfriendly species from both liquid and gas phases, the separation of gases and adsorption of…
(more)
▼ Activated carbons are used widely for the adsorption of environmentally unfriendly species from both liquid and gas phases, the separation of gases and adsorption of species from aqueous solution. Examples of the processes are the adsorption of Au(CN)2 and Ag(CN)2 from aqueous solution for the recovery of precious metals, the treatment of waste water containing organic chemicals and toxic metal species and the preparation of metal catalysts supported on carbon. This investigation has involved the study of the influence of porous structure and surface functional groups on the adsorption of both anionic and cationic metal species in order to understand the mechanism of adsorption of these species on active carbon from aqueous solution. Various types of oxygen functional groups were introduced onto the surface of coconut shell derived activated carbon through oxidation using nitric acid. Fourier transform infrared spectroscopy (FTIR), temperature programmed desorption (TPD) and selective neutralisation were used to characterise the surface oxygen functional groups. The oxidised carbons were also heat treated to provide a suite of carbons where the oxygen functional groups of various thermal stability were varied progressively. It was found that acidic oxygen functional groups mainly as carboxylic acid groups were incorporated into activated carbon by HNO3 oxidation. The phenol and quinone groups were also introduced by the oxidation process while the lactone groups were formed during heat treatment. The oxygen functional groups had a range of thermal stabilities with carboxylic acid groups being the least stable. A coconut shell derived active carbon was treated with ammonia and nitric acid followed by ammonia to incorporate nitrogen functional groups into the carbon. Active carbon with high nitrogen content was also prepared from nitrogen-rich precursor polyacrylonitrile (PAN). X-ray absorption near edge structure spectroscopy (XANES) and FTIR were used to investigate the structures of the nitrogen functional groups in carbons. The possible nitrogen functional groups present on carbon surface were pyridinic, pyrrolic (or indolic), pyridonic and aromatic amine-like structures. The adsorption characteristics of gold and silver cyanide anionic species on a suite of active carbons derived from coconut shell, polyacrylonitrile and chemical modification of the coconut shell carbon were investigated. The gold and silver cyanide adsorption capacities for coconut shell derived carbons correlate with total pore volume. Nitric acid oxidation treatment of the carbon was detrimental to gold adsorption in spite of the incorporation of oxygen content of carbon. The influence of nitrogen functional groups in the carbon structure on gold and silver adsorption was investigated using carbons derived from polyacrylonitrile. The addition of ethanol and butanol to the solution had an adverse effect on gold adsorption. Adsorption of silver cyanide ionic species on the active carbon was suppressed in the presence of excess free cyanide ions…
Subjects/Keywords: 541; Porous structure; Waste water treatment; Surface
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APA (6th Edition):
Jia, Y. F. (2000). Adsorption of heavy metal ion species from aqueous solution in activated carbon. (Doctoral Dissertation). University of Newcastle Upon Tyne. Retrieved from http://hdl.handle.net/10443/519
Chicago Manual of Style (16th Edition):
Jia, Yong Feng. “Adsorption of heavy metal ion species from aqueous solution in activated carbon.” 2000. Doctoral Dissertation, University of Newcastle Upon Tyne. Accessed January 23, 2020.
http://hdl.handle.net/10443/519.
MLA Handbook (7th Edition):
Jia, Yong Feng. “Adsorption of heavy metal ion species from aqueous solution in activated carbon.” 2000. Web. 23 Jan 2020.
Vancouver:
Jia YF. Adsorption of heavy metal ion species from aqueous solution in activated carbon. [Internet] [Doctoral dissertation]. University of Newcastle Upon Tyne; 2000. [cited 2020 Jan 23].
Available from: http://hdl.handle.net/10443/519.
Council of Science Editors:
Jia YF. Adsorption of heavy metal ion species from aqueous solution in activated carbon. [Doctoral Dissertation]. University of Newcastle Upon Tyne; 2000. Available from: http://hdl.handle.net/10443/519
22.
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
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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, 2020.
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 2020.
Vancouver:
Miranda CRB. Estudo de filmes de telureto de chumbo eletrodepositados sobre silício poroso. [Internet] [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2005. [cited 2020 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
23.
島田, 光星.
高次構造による配向高分子フィルムの複屈折制御.
Degree: 博士（マテリアルサイエンス）, 2017, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学
URL: http://hdl.handle.net/10119/14257
Supervisor:山口 政之
マテリアルサイエンス研究科
博士
Subjects/Keywords: Optical film; Orientation birefringence; Form birefringence; Porous structure
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APA (6th Edition):
島田, . (2017). 高次構造による配向高分子フィルムの複屈折制御. (Thesis). Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10119/14257
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):
島田, 光星. “高次構造による配向高分子フィルムの複屈折制御.” 2017. Thesis, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Accessed January 23, 2020.
http://hdl.handle.net/10119/14257.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
島田, 光星. “高次構造による配向高分子フィルムの複屈折制御.” 2017. Web. 23 Jan 2020.
Vancouver:
島田 . 高次構造による配向高分子フィルムの複屈折制御. [Internet] [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; 2017. [cited 2020 Jan 23].
Available from: http://hdl.handle.net/10119/14257.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
島田 . 高次構造による配向高分子フィルムの複屈折制御. [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; 2017. Available from: http://hdl.handle.net/10119/14257
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Nemati, Navid.
Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation.
Degree: Docteur es, Acoustique, 2012, Le Mans
URL: http://www.theses.fr/2012LEMA1028
► Ce travail présente et valide une théorie nonlocale nouvelle et généralisée, de la propagation acoustique dans les milieux poreux à structure rigide, saturés par un…
(more)
▼ Ce travail présente et valide une théorie nonlocale nouvelle et généralisée, de la propagation acoustique dans les milieux poreux à
structure rigide, saturés par un fluide viscothermique. Cette théorie linéaire permet de dépasser les limites de la théorie classique basée sur la théorie de l’homogénéisation. Elle prend en compte non seulement les phénomènes de dispersion temporelle, mais aussi ceux de dispersion spatiale. Dans le cadre de la nouvelle approche, une nouvelle procédure d’homogénéisation est proposée, qui permet de trouver les propriétés acoustiques à l’échelle macroscopique, en résolvant deux problèmes d’action-réponse indépendants, posés à l’échelle microscopique de Navier-Stokes-Fourier. Contrairement à la méthode classique d’homogénéisation, aucune contrainte de séparation d’échelle n’est introduite. En l’absence de
structure solide, la procédure redonne l’équation de dispersion de Kirchhoff-Langevin, qui décrit la propagation des ondes longitudinales dans les fluides viscothermiques. La nouvelle théorie et procédure d’homogénéisation nonlocale sont validées dans trois cas, portant sur des microgéométries significativement différentes. Dans le cas simple d’un tube circulaire rempli par un fluide viscothermique, on montre que les nombres d’ondes et les impédances prédits par la théorie nonlocale, coïncident avec ceux de la solution exacte de Kirchhoff, connue depuis longtemps. Au contraire, les résultats issus de la théorie locale (celle de Zwikker et Kosten, découlant de la théorie classique d’homogénéisation) ne donnent que le mode le plus attenué, et encore, seulement avec le petit désaccord existant entre la solution simplifiée de Zwikker et Kosten et celle exacte de Kirchhoff. Dans le cas où le milieu poreux est constitué d’un réseau carré de cylindres rigides parallèles, plongés dans le fluide, la propagation étant regardée dans une direction transverse, la vitesse de phase du mode le plus atténué peut être calculée en fonction de la fréquence en suivant les approches locale et nonlocale, résolues au moyen de simulations numériques par la méthode des Eléments Finis. Elle peut être calculée d’autre part par une méthode complètement différente et quasi-exacte, de diffusion multiple prenant en compte les effets viscothermiques. Ce dernier résultat quasi-exact montre un accord remarquable avec celui obtenu par la théorie nonlocale, sans restriction de longueur d’onde. Avec celui de la théorie locale, l’accord ne se produit que tant que la longueur d’onde reste assez grande. Enfin, dans le cas où la microgéométrie, formée de portions de conduits droits, est celle de résonateurs de Helmholtz placés en dérivation sur un guide principal, on peut, en appliquant la nouvelle procédure d’homogénéisation de la théorie nonlocale, et en modélisant les champs par des ondes planes aller retour dans chacune des portions droites, calculer les deux fonctions de densité et compressibilité effectives du milieu dans l’espace de Fourier. Sans faire d’erreur appréciable les ondes planes aller-retour en question peuvent…
Advisors/Committee Members: Aurégan, Yves (thesis director), Lafarge, Denis (thesis director).
Subjects/Keywords: Milieux poreux; Propagation acoustique; Structure rigide; Fluide viscothermique; Théorie non locale; Homogénéisation; Métamatériaux; Dispersion spatiale; Porous materials; 534
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APA ·
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APA (6th Edition):
Nemati, N. (2012). Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation. (Doctoral Dissertation). Le Mans. Retrieved from http://www.theses.fr/2012LEMA1028
Chicago Manual of Style (16th Edition):
Nemati, Navid. “Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation.” 2012. Doctoral Dissertation, Le Mans. Accessed January 23, 2020.
http://www.theses.fr/2012LEMA1028.
MLA Handbook (7th Edition):
Nemati, Navid. “Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation.” 2012. Web. 23 Jan 2020.
Vancouver:
Nemati N. Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation. [Internet] [Doctoral dissertation]. Le Mans; 2012. [cited 2020 Jan 23].
Available from: http://www.theses.fr/2012LEMA1028.
Council of Science Editors:
Nemati N. Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation : Théorie macroscopique de la propagation du son dans les matériaux poreux incluant les phénomènes de dispersion spatiale : principe et validation. [Doctoral Dissertation]. Le Mans; 2012. Available from: http://www.theses.fr/2012LEMA1028
Universidade do Estado do Rio de Janeiro
25.
Diego Dornelas Diogo.
Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão.
Degree: Master, 2011, Universidade do Estado do Rio de Janeiro
URL: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2713
;
► Neste trabalho, copolímeros à base de acrilonitrila e divinilbenzeno foram sintetizados, utilizando a técnica de polimerização em suspensão, na presença de três agentes porogênicos diferentes…
(more)
▼ Neste trabalho, copolímeros à base de acrilonitrila e divinilbenzeno foram sintetizados, utilizando a técnica de polimerização em suspensão, na presença de três agentes porogênicos diferentes (álcool isoamílico, metil-etil-cetona e tolueno). Esses copolímeros foram caracterizados por meio da determinação da densidade aparente, do volume e diâmetro de poros, por microscopia ótica e microscopia eletrônica de varredura e foram avaliados quanto à capacidade de inchamento em heptano e tolueno. O principal intuito dessa pesquisa foi correlacionar a formação da estrutura porosa desses materiais com os principais parâmetros de síntese (grau de diluição dos monômeros, poder solvatante do diluente e teor do agente de reticulação). Desses parâmetros, o que mais influenciou na formação da estrutura porosa desses materiais foi o poder solvatante do diluente. A teoria dos parâmetros de solubilidade de Hansen e Hildebrand foi utilizada com o intuito de fazer uma previsão das características porosas dos copolímeros à base de acrilonitrila e divinilbenzeno sintetizados na presença de três diluentes diferentes. Dentre esses diluentes, o álcool isoamílico foi o pior solvente para os copolímeros de AN-DVB, em todos os teores de agente de reticulação e em todas as diluições utilizadas. O tolueno foi o melhor solvente para os copolímeros que contêm altos teores de agente de reticulação. Estas observações estão de acordo com as previsões dos parâmetros de solubilidade de Hansen e Hildebrand. A metil-etil-cetona foi o melhor solvente para os copolímeros que contêm teores intermediários de agente de reticulação. Esta observação só está condizente com o parâmetro de solubilidade de Hansen.
In this work, acrylonitrile-divinylbenzene copolymers were synthesized using the technique of suspension polymerization in the presence of three different solvents (isoamyl alcohol, methyl-ethyl-ketone and toluene). These copolymers were characterized by apparent density, pore volume and pore diameter, optical and scanning electron microscopy, and were evaluated for their ability to swell in heptane and toluene. The principal aim of this research was to correlate the porous structure formation of these materials, with the main synthesis parameters (degree of dilution, solvating power of the diluent and crosslinking degree). Among these parameters, the most important on the formation of the materials porous structure was the solvating power of the diluent. The theory of solubility parameters of Hansen and Hildebrand was used in order to make a prediction of the porous characteristics of acrylonitrile-divinylbenzene copolymers synthesized in the presence of three different diluents. Among these solvents, the isoamyl alcohol was the worst solvent for acrylonitrile-divinylbenzene copolymers, at all levels of crosslinking degree and at all dilutions used. Toluene was the best solvent for the copolymers containing high levels crosslinking degree. These observations are consistent with the predictions of the solubility parameters of Hansen and Hildebrand. The…
Advisors/Committee Members: Luiz Cláudio de Santa Maria, Marcos Antonio da Silva Costa, Viviane Gomes Teixeira, Marcia Angélica Fernandes e Silva Neves.
Subjects/Keywords: Copolímeros à base de acrilonitrila e divinilbenzeno; estrutura porosa; polimerização em suspensão
; Acrylonitrile-divinylbenzene copolymers; porous structure; suspension polymerization; QUIMICA
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APA (6th Edition):
Diogo, D. D. (2011). Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão. (Masters Thesis). Universidade do Estado do Rio de Janeiro. Retrieved from http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2713 ;
Chicago Manual of Style (16th Edition):
Diogo, Diego Dornelas. “Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão.” 2011. Masters Thesis, Universidade do Estado do Rio de Janeiro. Accessed January 23, 2020.
http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2713 ;.
MLA Handbook (7th Edition):
Diogo, Diego Dornelas. “Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão.” 2011. Web. 23 Jan 2020.
Vancouver:
Diogo DD. Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão. [Internet] [Masters thesis]. Universidade do Estado do Rio de Janeiro; 2011. [cited 2020 Jan 23].
Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2713 ;.
Council of Science Editors:
Diogo DD. Avaliação da influência da interação polímero-solvente sobre a porosidade de copolímeros de acrilonitrila e divinilbenzeno obtidos por polimerização em suspensão. [Masters Thesis]. Universidade do Estado do Rio de Janeiro; 2011. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2713 ;
University of Cincinnati
26.
Liang, Huayan.
Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube.
Degree: MS, Engineering and Applied Science: Mechanical
Engineering, 2014, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407189
► In present study, the enhancement of meniscus evaporation by changing meniscus shape and area was investigated. Rather than observing the meniscus shape directly, an alternative…
(more)
▼ In present study, the enhancement of meniscus
evaporation by changing meniscus shape and area was investigated.
Rather than observing the meniscus shape directly, an alternative
method has been utilized. A Condensation Particle Counter (CPC)
structure, which benefits from meniscus evaporation of a
porous
media to make vapor for water droplet growth, has been introduced
to analyze the production water droplet. By analyzing the size and
concentration of the condensed water droplet from CPC, the
enhancement of meniscus evaporation taken place at the
porous media
was determined. The meniscus shape and area alterations were
controlled by applying an additional pressure onto the meniscus.
The results of the bigger condensed water droplet and higher
concentration clearly demonstrate that the enhancement has been
achieved to the meniscus evaporation, which was led by changing of
the additional pressure applied to the meniscus of the
porous
media.
Advisors/Committee Members: Son, Sang Young (Committee Chair).
Subjects/Keywords: Mechanics; Condensation; Particle growth; Non-wetting porous structure; Water vapor condensation; Interferometric Mie Imaging; Evaporation Condensation Tube
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APA (6th Edition):
Liang, H. (2014). Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407189
Chicago Manual of Style (16th Edition):
Liang, Huayan. “Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube.” 2014. Masters Thesis, University of Cincinnati. Accessed January 23, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407189.
MLA Handbook (7th Edition):
Liang, Huayan. “Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube.” 2014. Web. 23 Jan 2020.
Vancouver:
Liang H. Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube. [Internet] [Masters thesis]. University of Cincinnati; 2014. [cited 2020 Jan 23].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407189.
Council of Science Editors:
Liang H. Evaporation Enhancement for Condensational Nanoparticle
Growth in Hydrophobic Evaporation - Condensation Tube. [Masters Thesis]. University of Cincinnati; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407407189
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, 2020.
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 2020.
Vancouver:
Tsai H. Study on ultra low-k silicon oxide with nano-porous structure. [Internet] [Thesis]. NSYSU; 2002. [cited 2020 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
University of Lund
28.
Nilsson, Emelie.
Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description.
Degree: 2016, University of Lund
URL: http://lup.lub.lu.se/record/ff118023-d849-4f1c-b9f6-c0f3e5f6ec26
;
http://portal.research.lu.se/ws/files/7656647/Spik_Emelie_exkl_papers.pdf
► The formation process of porous silica materials is an intricate process, involving a number of components that interact to form a highly organized material. Both…
(more)
▼ The formation process of porous silica materials is
an intricate process, involving a number of components that
interact to form a highly organized material. Both zeolites and
mesoporous silica materials typically require the presence of
organic structure director agents (SDAs) around which the silica
network polymerizes. For zeolites the SDAs are molecular and for
mesoporous silica the SDAs assemble into aggregates, i.e. micelles.
The aim of this thesis is to further the understanding of the
initial stages of the formation of porous silica materials. This
has been done by investigating aqueous model systems of components
critical for the formation of porous silica materials using neutron
scattering coupled with empirical potential structure refinement
(EPSR) to arrive at atomistic descriptions of the systems. The
systems are based on aqueous solutions of single components under
different conditions as well as a system in which two components
are mixed and allowed to interact. Molecular SDAs,
tetramethylammonium bromide and tetrapropylammonium bromide
respectively, were found to have different association behavior;
small clusters of tetrapropylammonium ions were formed whereas
tetramethylammonium only formed pairs. Micellar SDA aggregates of
decyltrimethylammonium ions with different counterions reveal a
strong dependence on the identity of the counterions. The effect of
the counterions appears to originate from a subtle balance between
electrostatic interactions and ion-specific effects. A model system
for oligomeric silica species was evaluated. The system is based on
cubic silsesquioxane. 29Si-NMR was used to identify and quantify
the silica species that occur in solution. The silica species
reveal a high dependence on additives in solution, which can
stabilise the cubic silica molecule. Finally the silica model was
probed in the presence of decyltrimethylammonium ions in order to
probe interactions that occur in the early stages of the synthesis
of MCM-41. The silica species show little affinity for the micelle
surface, even though being negatively charged, however their
presence in the system greatly decrease the size of the micelles
compared to those in a pure aqueous solution.
Subjects/Keywords: Fysikalisk kemi; porous silica; struture directing agents; 29Si-NMR; neutron scattering; empirical potentail structure refinement; micelles
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APA ·
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MLA ·
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APA (6th Edition):
Nilsson, E. (2016). Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description. (Doctoral Dissertation). University of Lund. Retrieved from http://lup.lub.lu.se/record/ff118023-d849-4f1c-b9f6-c0f3e5f6ec26 ; http://portal.research.lu.se/ws/files/7656647/Spik_Emelie_exkl_papers.pdf
Chicago Manual of Style (16th Edition):
Nilsson, Emelie. “Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description.” 2016. Doctoral Dissertation, University of Lund. Accessed January 23, 2020.
http://lup.lub.lu.se/record/ff118023-d849-4f1c-b9f6-c0f3e5f6ec26 ; http://portal.research.lu.se/ws/files/7656647/Spik_Emelie_exkl_papers.pdf.
MLA Handbook (7th Edition):
Nilsson, Emelie. “Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description.” 2016. Web. 23 Jan 2020.
Vancouver:
Nilsson E. Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description. [Internet] [Doctoral dissertation]. University of Lund; 2016. [cited 2020 Jan 23].
Available from: http://lup.lub.lu.se/record/ff118023-d849-4f1c-b9f6-c0f3e5f6ec26 ; http://portal.research.lu.se/ws/files/7656647/Spik_Emelie_exkl_papers.pdf.
Council of Science Editors:
Nilsson E. Aqueous behaviour of characteristic molecules in the
synthesis of porous silica materials : - an atomistic
description. [Doctoral Dissertation]. University of Lund; 2016. Available from: http://lup.lub.lu.se/record/ff118023-d849-4f1c-b9f6-c0f3e5f6ec26 ; http://portal.research.lu.se/ws/files/7656647/Spik_Emelie_exkl_papers.pdf
29.
Oikonomopoulou, Vasiliki.
Ανάπτυξη τροφίμων πορώδους δομής.
Degree: 2014, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)
URL: http://hdl.handle.net/10442/hedi/42134
► The modern way of life has turned consumers to the consumption of processedfoods that are easy to be used and require little preparation time. The…
(more)
▼ The modern way of life has turned consumers to the consumption of processedfoods that are easy to be used and require little preparation time. The optimizationand development of new products with desirable characteristics is based on theexamination and understanding of the effect of production methods and processconditions on the quality characteristics of final products. Structure formation duringproduction and processing is playing a predominant role in the qualitycharacteristics of processed foods and also determines many other properties, suchas mechanical properties, appearance, taste, etc., that are crucial for theacceptance of food products by consumers. The objective of this thesis is thedevelopment of foods with determined porous structure and the correlation ofstructure with the quality properties of the products. Drying and extrusion were usedfor the production of foods with defined structure. The materials that were selectedto be studied are Greek products, representative of the three main food categories -fruits, vegetables and cereals. For the production of the extrudates, rice flour wasmixed with dehydrated carrot powder. The effect of freeze drying pressure onproperties of rice, potatoes, mushrooms and strawberries was studied. In addition,the effect of freeze drying, vacuum drying and air drying on quality characteristics ofosmotically pretreated potatoes and bananas was examined. For the extrusionprocess, a twin screw extruder was used, regulating four independent parameters,the extrusion temperature, the screw speed, the feed moisture content and the ratioof the dehydrated carrot powder to the rice flour. Various properties weredetermined in the final products that include structural characteristics, mechanicalproperties, thermal properties, rheological properties and sensory characteristics, aswell as the disintegration kinetics of components in simulated gastric fluid andsaliva. Simple mathematical models were applied or developed for the correlation ofproperties with process conditions, as well as the correlation of properties withstructure. Various process conditions and methods resulted in the development offoods with different structures. Structure significantly influenced the examinedproperties and was a key factor for the determination of the products characteristicsand their acceptance by consumers.
Ο σύγχρονος τρόπος ζωής των ανθρώπων έχει καταστήσει απαραίτητη την κατανάλωση τυποποιημένων τροφίμων, τα οποία είναι εύκολα στη χρήση και απαιτούν μικρό χρόνο προετοιμασίας. Η ανάπτυξη και βελτιστοποίηση νέων,επεξεργασμένων προϊόντων με επιθυμητά χαρακτηριστικά βασίζεται στη μελέτη της επίδρασης των μεθόδων και συνθηκών επεξεργασίας στις ιδιότητες των προϊόντων.Μεταξύ των ιδιοτήτων που χαρακτηρίζουν την ποιότητα των επεξεργασμένων προϊόντων, οι δομικές ιδιότητες είναι ιδιαίτερα κρίσιμες. Η διαμόρφωση της δομής των προϊόντων επηρεάζει πλήθος άλλων ιδιοτήτων, όπως είναι οι μηχανικές ιδιότητες, η εμφάνιση, η γεύση, κτλ. Αντικείμενο, επομένως, της συγκεκριμένης διατριβής αποτελεί η ανάπτυξη…
Subjects/Keywords: Πορώδης δομή; Ξήρανση; Εκβολή; Ιδιότητες ποιότητας; Μαθηματική προτυποποίηση; Τρόφιμα; Food; Porous structure; Drying; Extrusion; Quality properties; Mathematical modelling
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APA ·
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Export
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APA (6th Edition):
Oikonomopoulou, V. (2014). Ανάπτυξη τροφίμων πορώδους δομής. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/42134
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):
Oikonomopoulou, Vasiliki. “Ανάπτυξη τροφίμων πορώδους δομής.” 2014. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 23, 2020.
http://hdl.handle.net/10442/hedi/42134.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oikonomopoulou, Vasiliki. “Ανάπτυξη τροφίμων πορώδους δομής.” 2014. Web. 23 Jan 2020.
Vancouver:
Oikonomopoulou V. Ανάπτυξη τροφίμων πορώδους δομής. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2014. [cited 2020 Jan 23].
Available from: http://hdl.handle.net/10442/hedi/42134.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oikonomopoulou V. Ανάπτυξη τροφίμων πορώδους δομής. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2014. Available from: http://hdl.handle.net/10442/hedi/42134
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
30.
Liang, Xin.
Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries.
Degree: PhD, 2015, University of Wollongong
URL: 0912
MATERIALS
ENGINEERING
;
https://ro.uow.edu.au/theses/4634
► Rechargeable lithium/sulfur batteries have attracted significant attention due to their high theoretical specific capacity, high power density and low cost. Nevertheless, sulfur is very…
(more)
▼ Rechargeable lithium/sulfur batteries have attracted significant attention due to their high theoretical specific capacity, high power density and low cost. Nevertheless, sulfur is very much an electrically insulating material, which leads to poor electrochemical accessibility and low utilization of the sulfur in the electrode. The polysulfide anions which are formed as the reaction intermediates are highly soluble in the organic electrolyte solvent, which results in low active material utilization, low coulombic efficiency and short cycle life of the sulfur electrode. Many approaches have been investigated for improving the performances of the sulfur cathode, such as synthesizing sulfur/carbon and sulfur/conducting polymer composites, adding adsorption additives into the electrodes, modification of the electrolyte, etc. Much attention has been paid to recent advances in the sulfur cathodes. In my doctoral work, honeycomb-like sulfur was synthesized via a soft template strategy for lithium/sulfur battery cathode, which has shown improved electrochemical performance compared to commercial sulfur particles. Another
[email protected]@polypyrrole (
[email protected]@PPy) composite with half-split tubular
structure was prepared by the oxidative chemical polymerization method together with the chemical precipitation method. Moreover, the spray pyrolysis method was applied to synthesize a
porous sulfur/dual-carbon composite with improved electrochemical performance, which shows great potential for the commercialization of lithium/sulfur batteries. Finally, an active carbon/nano-sulfur/polypyrrole composite with host-container architecture was prepared by the spray precipitation method and a subsequent oxidative chemical polymerization method for lithium/sulfur battery cathode.
Advisors/Committee Members: Jiazhao Wang.
Subjects/Keywords: Lithium/sulfur batteries; porous structure; polypyrrole/sulfur/polypyrrole; spraypyrolysis/ sublimation method; active carbon/nano sulfur/polypyrrole
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Liang, X. (2015). Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries. (Doctoral Dissertation). University of Wollongong. Retrieved from 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/4634
Chicago Manual of Style (16th Edition):
Liang, Xin. “Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries.” 2015. Doctoral Dissertation, University of Wollongong. Accessed January 23, 2020.
0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/4634.
MLA Handbook (7th Edition):
Liang, Xin. “Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries.” 2015. Web. 23 Jan 2020.
Vancouver:
Liang X. Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries. [Internet] [Doctoral dissertation]. University of Wollongong; 2015. [cited 2020 Jan 23].
Available from: 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/4634.
Council of Science Editors:
Liang X. Study on Sulfur Cathode Materials for High Performance Lithium/Sulfur Batteries. [Doctoral Dissertation]. University of Wollongong; 2015. Available from: 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/4634
◁ [1] [2] [3] [4] ▶
. 
Open Access Theses and Dissertations