You searched for subject:(Surface Structure).
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University of Alberta
1.
Binazadeh, Mojtaba.
Effect of Secondary Structure on Surface Adsorption of
Peptides.
Degree: PhD, Department of Chemical and Materials
Engineering, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/jh343v004 
► Protein adsorption at the biomaterial-tissue interface has several detrimental consequences which undermines the widespread application of engineered materials. Herein, it was asked what role protein…
(more)
▼ Protein adsorption at the biomaterial-tissue interface
has several detrimental consequences which undermines the
widespread application of engineered materials. Herein, it was
asked what role protein secondary structures play in the adsorption
of peptides, as well as how these structures affect the
physicochemical properties of the final adsorbed layer on bare gold
(Au) and poly (ethylene glycol) (PEG) modified Au surfaces. To this
end, α-helices and -sheets were induced in poly-L-Lysine (PLL) and
persistence of these structures in solution and adsorbed state was
confirmed by circular dichroism (CD). PLL adsorption to Au surfaces
was monitored using quartz crystal microbalance with dissipation
(QCM-D). PLL adsorption on bare Au resulted in higher initial
adsorption rates for α-helices as compared to β-sheets but the
final adsorbed amount of β-sheets was higher than α-helices
regardless of solution salt concentration. Viscosities for films
formed from α-helices were ~2x that of β-sheets films, regardless
of solution ionic strength. β-sheets have higher zeta potential as
compared to α-helices. The interaction energy between PLL and Au
surface was found to be driven by electrostatic and van der Waals
forces. Presence of PEG grafted brush layers on the Au surface
drastically reduced the adsorbed amount of different PLL structures
and PLL layers adsorbed on PEG coated surfaces had similar layer
viscosities. To further understand PLL adsorption mechanism and
adsorbed layer properties, the interacting forces between PLL-Au,
PLL-PLL, PEG-mica, and PEG-PLL surfaces were studied by surface
forces apparatus (SFA). SFA results revealed that the adhesion
energy of β-sheet vs. Au and β-sheet vs. β-sheet was considerably
more than α-helix vs. Au and α-helix vs. α-helix systems
respectively. The substrate surface adhesion energy of β-sheet was
more dependent on the solution salt concentration as compared to
α-helix due to the higher electrostatic interactions of β-sheet PLL
film with Au (higher zeta potential value of β-sheet PLL). It was
found that presence of PEG grafted layer eliminated the PLL
secondary structure effect on adsorption due to the purely
repulsive force that governed the PEG vs. PLL
interaction.
Subjects/Keywords: Peptide; Surface Adsorption; Secondary Structure
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APA (6th Edition):
Binazadeh, M. (2013). Effect of Secondary Structure on Surface Adsorption of
Peptides. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/jh343v004
Chicago Manual of Style (16th Edition):
Binazadeh, Mojtaba. “Effect of Secondary Structure on Surface Adsorption of
Peptides.” 2013. Doctoral Dissertation, University of Alberta. Accessed April 20, 2021.
https://era.library.ualberta.ca/files/jh343v004.
MLA Handbook (7th Edition):
Binazadeh, Mojtaba. “Effect of Secondary Structure on Surface Adsorption of
Peptides.” 2013. Web. 20 Apr 2021.
Vancouver:
Binazadeh M. Effect of Secondary Structure on Surface Adsorption of
Peptides. [Internet] [Doctoral dissertation]. University of Alberta; 2013. [cited 2021 Apr 20].
Available from: https://era.library.ualberta.ca/files/jh343v004.
Council of Science Editors:
Binazadeh M. Effect of Secondary Structure on Surface Adsorption of
Peptides. [Doctoral Dissertation]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/jh343v004
Louisiana State University
2.
Li, Yi.
Chemical composition and structure study of surfaces and ultrathin films of complex compounds.
Degree: PhD, Physical Sciences and Mathematics, 2013, Louisiana State University
URL: etd-04102013-025926
;
https://digitalcommons.lsu.edu/gradschool_dissertations/3651
► Complex Materials, such as transition-metal oxides (TMOs) with exotic properties provide immense opportunities in condensed matter and materials science. The signature and challenge of these…
(more)
▼ Complex Materials, such as transition-metal oxides (TMOs) with exotic properties provide immense opportunities in condensed matter and materials science. The signature and challenge of these materials is the multitude of competing ground states that can be tuned or manipulated by doping, structural modification, strain induction, or the application of external stimulus. In the past few years, it is becoming increasingly clear that surfaces/interfaces, thin films, and heterostructures of TMOs, display a rich diversity of fascinating properties that are related to, but not identical to, the bulk phenomena. The fundamental issues for the understanding of these emergent phenomena include the structure and chemical composition in the proximity of surface/interface. In the thesis, I have developed a method using angle resolved X-ray photoelectron spectroscopy (ARXPS) to characterize the surface structure and chemical composition. In particular, I have considered the photoelectron diffraction effects on the relative intensities of different core electron levels which are essential to reveal the variation of chemical composition. I developed the basic methodology for the data analysis of the ARXPS spectra and used the well-known crystal surface of Sr2RuO4 (100) to verify our methodology. Using the angle-dependence of Sr 3d/ Ru 3p core level intensity ratio, our method clearly confirms that the termination layer of the surface is SrO-layer with minor amount of oxygen vacancies. The diffraction pattern matches very well with the theoretical calculation of forward scattering peaks. Then I have used the developed ARXPS method coupled with low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) to investigate the surface structure and chemical composition of a widely used crystal surface: SrTiO3(100). I found that, although maintaining in-plane unreconstructed: primary p(1×1), the surface exhibits out-of-the-plane bulking relaxation. More importantly, the systematic analysis of ARXPS spectra show that the surface is TiO2-layer terminated and has significant oxygen vacancies. These results confirm the conjecture from LEED-I(V) refinement on structure. The existence of surface oxygen-vacancies may explain the observed surface metallicity of SrTiO3. Finally, I have studied the chemical composition of the ultrathin crystalline films of La2/3Sr1/3MnO3 on SrTiO3 (100), especially focusing on the Sr surface segregation. I found that Sr concentration at the surface is appreciably higher than the corresponding bulk value. Such an off-stoichiometric behavior should link to the different physical properties such as nonmetallic/nonmagnetic “dead layer” behavior in the ultrathin films compared with the bulk crystal. To conclude, by considering the photoelectron diffraction effects, I have developed a method of ARXPES to characterize the surface chemical composition, which is essential for the understanding of emergent phenomena at surface, interface and thin film of complex materials.
Subjects/Keywords: Surface Structure; ARXPS; Chemical Composition
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APA (6th Edition):
Li, Y. (2013). Chemical composition and structure study of surfaces and ultrathin films of complex compounds. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04102013-025926 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3651
Chicago Manual of Style (16th Edition):
Li, Yi. “Chemical composition and structure study of surfaces and ultrathin films of complex compounds.” 2013. Doctoral Dissertation, Louisiana State University. Accessed April 20, 2021.
etd-04102013-025926 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3651.
MLA Handbook (7th Edition):
Li, Yi. “Chemical composition and structure study of surfaces and ultrathin films of complex compounds.” 2013. Web. 20 Apr 2021.
Vancouver:
Li Y. Chemical composition and structure study of surfaces and ultrathin films of complex compounds. [Internet] [Doctoral dissertation]. Louisiana State University; 2013. [cited 2021 Apr 20].
Available from: etd-04102013-025926 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3651.
Council of Science Editors:
Li Y. Chemical composition and structure study of surfaces and ultrathin films of complex compounds. [Doctoral Dissertation]. Louisiana State University; 2013. Available from: etd-04102013-025926 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3651
3.
BONADIO, RAFFAELE.
Broadband Surface Wave Tomography of Ireland, Britain and Other Regions.
Degree: School of Natural Sciences. Discipline of Geology, 2019, Trinity College Dublin
URL: http://hdl.handle.net/2262/90896
► Over the last decades, seismic surface-wave studies have produced increasingly detailed images of the Earth s structure at a regional scale. In this study, we…
(more)
▼ Over the last decades, seismic
surface-wave studies have produced
increasingly detailed images of the Earth s
structure at a regional scale.
In this study, we have tuned well-established techniques and when
required implemented new ones in order to investigate regions in which
important debates are still ongoing, regarding the
structure and the evolution
of the Earth beneath them.
Several studies suggested that the Paleogene uplift of parts of Britain
and Ireland was caused by a lateral branch of the Iceland mantle plume,
which played a fundamental role in the evolution of the North Atlantic Ocean
over the past 60 M.y. Alternatively, among competing hypothesis, it was
suggested that the uplift could be due to the far-field stress associated with
the Alpine and Pyrenees Orogenies, with reactivation of old Variscan and
Caledonian faults across Ireland and Britain. A major part of this study is
aimed at gaining new insights into the seismic
structure of the British Isles,
which can help us answer these open questions. Teleseismic earthquakes
and ambient noise, recorded at densely spaced seismic stations in the region,
were used to determine the
surface-wave dispersion across the British Isles
and construct detailed images of the seismic
structure beneath the area. The
measurements, obtained using independent
surface-wave analysis techniques
(cross-correlation of teleseismic
surface waves, multimode waveform fitting,
and ambient noise interferometry), were applied to produce the first 3D
shear-velocity model of the lithosphere and the asthenosphere of the entire
region including Ireland, Britain, and the Irish Sea. The application of different
methodologies yielded complementary frequency bands of the measurements,
sensitive to different depths, from the shallow crust to the deep upper mantle.
Abundant, newly available data was used to image the region with higher
resolution than previously. The highly uneven station coverage resulted in a
considerably irregular distribution of the measurements in the area; this, and
the effects of errors on the measurements, required the development of a new,
multi-resolution tomographic scheme. This scheme allows us to maximize the
information extracted from the data and reach an optimal target resolution of
the model at each knot, minimizing the effects of uneven data sampling and
of the propagation of systematic errors.The multi-resolution phase-velocity maps, obtained at densely spaced
periods, were inverted, point by point, for shear-velocity
structure in order
to produce a 3D, shear-velocity model of the lithosphere and asthenosphere.
The optimal resolution tomography offers important new insights into the
structure and evolution of the British Isles. A robust, low-velocity anomaly
beneath the Irish Sea and its surroundings persists in the models from ~60
to at least 140 km depth, indicating an anomalously thin lithosphere. The
area that exhibits the low velocity anomaly corresponds to where uplift and
volcanism are evidenced by geological data. Our results also show a striking…
Advisors/Committee Members: Chew, David.
Subjects/Keywords: Surface wave; Seismic structure; British Isles
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APA (6th Edition):
BONADIO, R. (2019). Broadband Surface Wave Tomography of Ireland, Britain and Other Regions. (Thesis). Trinity College Dublin. Retrieved from http://hdl.handle.net/2262/90896
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):
BONADIO, RAFFAELE. “Broadband Surface Wave Tomography of Ireland, Britain and Other Regions.” 2019. Thesis, Trinity College Dublin. Accessed April 20, 2021.
http://hdl.handle.net/2262/90896.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
BONADIO, RAFFAELE. “Broadband Surface Wave Tomography of Ireland, Britain and Other Regions.” 2019. Web. 20 Apr 2021.
Vancouver:
BONADIO R. Broadband Surface Wave Tomography of Ireland, Britain and Other Regions. [Internet] [Thesis]. Trinity College Dublin; 2019. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/2262/90896.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
BONADIO R. Broadband Surface Wave Tomography of Ireland, Britain and Other Regions. [Thesis]. Trinity College Dublin; 2019. Available from: http://hdl.handle.net/2262/90896
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
4.
Macquet, Marie.
Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation.
Degree: Docteur es, Sciences de la terre et de l'univers, et de l'environnement, 2014, Université de Grenoble
URL: http://www.theses.fr/2014GRENU037
► Durant cette thèse, nous appliquons la méthode de la corrélation de bruit ambiant dans la région particulièrement hétérogène des Pyrénées et des ses alentours (socle…
(more)
▼ Durant cette thèse, nous appliquons la méthode de la corrélation de bruit ambiant dans la région particulièrement hétérogène des Pyrénées et des ses alentours (socle rocheux affleurant et bassin sédimentaires épais). Le jeu de données utilisé est une combinaison de deux réseaux temporaires large-bande français et espagnol (PYROPE et IBERARRAY) et de stations des réseaux permanents large-bande français et catalan. Le bruit sismique, enregistré pendant un an par les 158 stations est utilisé pour calculer les corrélations dans la gamme de période 5-55 s. Les vitesses de groupe de l'onde de Rayleigh et de l'onde de Love entre paires de stations sont inversées de manière linéarisée et nous obtenons, pour chaque période, des cartes de vitesses de groupe avec une résolution latérale d'environ 40 km. La comparaison entre les deux types d'ondes montre qu'il existe une anisotropie radiale à courtes périodes, alors que peu ou pas d'anisotropie radiale n'est visible aux périodes plus longues. Nous avons développé une nouvelle stratégie d'inversion des courbes de dispersion en modèle de vitesse d'onde S que nous avons appliqué sur les vitesses de groupe de l'onde de Rayleigh. Cette approche d'inversion est basée sur une exploration complète de l'espace des modèles et une inversion linéarisée. Le modèle obtenu, validé par la comparaison avec des résultats provenant d'autres méthodes, est le premier modèle 3-D crustale en vitesse d'onde S de la région et il permet d'apporter des contraintes sur la géodynamique des Pyrénées et de ses alentours. Deux points importants sont soulevés : (1) Des profils de vitesses atypiques sous l'Est du Massif Central, avec une croûte amincie et des vitesses anormalement faibles dans le manteau supérieur. (2) Deux anomalies de vitesses rapides sous la zone du Labourd-Mauléon et dans le prolongement du bassin de Parentis. Ces anomalies, situées à 25 km de profondeur, sont interprétées comme les traces de l'hyper-extension qui aurait précédée la phase de collision amenant à la formation des Pyrénées. La forte hétérogénéité de la zone permet également de faire l'analyse de l'influence de la non prise en compte des déviations de rais lors de l'inversion. Les premiers résultats montrent que le modèle obtenu en utilisant la théorie des rais droits ne permet pas d'expliquer les déviations calculées par la méthode de formation de voie. Ces déviations observées peuvent donc apporter une amélioration du modèle en considérant l'utilisation d'une inversion combinée.
In this thesis, we applied the ambient noise correlation method in the very heterogeneous region of the Pyrenees and the surrounding areas (mountain belt and thick sedimentary basins). The dataset used is a combination of two temporary broadband arrays from France and Spain (PYROPE and IBERARRAY) and stations of the French and Catalan permanent broadband arrays. Seismic noise recorded over years by the 158 stations was used to calculate correlations in a period range of 5-55 s. Observed Rayleigh and Love wave group velocities between pairs of…
Advisors/Committee Members: Paul, Anne (thesis director), Pedersen, Helle Anette (thesis director).
Subjects/Keywords: Sismologie; Structure; Croûte; Pyrénées; Ondes de surface; Seismology; Structure; Crust; Pyrenees; Surface waves; 550
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APA ·
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APA (6th Edition):
Macquet, M. (2014). Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2014GRENU037
Chicago Manual of Style (16th Edition):
Macquet, Marie. “Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation.” 2014. Doctoral Dissertation, Université de Grenoble. Accessed April 20, 2021.
http://www.theses.fr/2014GRENU037.
MLA Handbook (7th Edition):
Macquet, Marie. “Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation.” 2014. Web. 20 Apr 2021.
Vancouver:
Macquet M. Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation. [Internet] [Doctoral dissertation]. Université de Grenoble; 2014. [cited 2021 Apr 20].
Available from: http://www.theses.fr/2014GRENU037.
Council of Science Editors:
Macquet M. Tomographie crustale des Pyrénées et des régions avoisinantes par corrélation de bruit : Crustal tomography of the Pyrenees and the surrounding regions by noise correlation. [Doctoral Dissertation]. Université de Grenoble; 2014. Available from: http://www.theses.fr/2014GRENU037
University of Toronto
5.
Raza, Shahzad.
Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas.
Degree: 2012, University of Toronto
URL: http://hdl.handle.net/1807/32618
► The conventional mushroom-like Sievenpiper structure is re-visited in this thesis and a relationship is established between the dispersion and reflection phase characteristics of the structure.…
(more)
▼ The conventional mushroom-like Sievenpiper structure is re-visited in this thesis and a
relationship is established between the dispersion and reflection phase characteristics of the structure. It is shown that the reflection phase frequency at which the structure behaves as a Perfect Magnetic Conductor (PMC) can be predicted for varying angles of incidence from the modal distribution in the dispersion diagrams and corresponds to the supported leaky modes within the light cone. A methodology to independently tune the location of the PMC frequency point with respect to the surface wave band-gap location is then presented. The influence of having said PMC frequency point located inside or outside the surface wave band-gap on a dipole radiation pattern is then studied numerically. It is demonstrated that the antenna exhibits a higher gain when the PMC frequency and band-gap coincide versus when they are separated. Two design cases are then presented for when the aforementioned properties coincide and are separated and a gain improvement of 1.2 dB is measured for the former case.
MAST
Advisors/Committee Members: Eleftheriades, George V., Electrical and Computer Engineering.
Subjects/Keywords: Electromagnetic Bandgap Structure; surface-wave band gap; mushroom structure; High Impedance Surface; 0544
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APA (6th Edition):
Raza, S. (2012). Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/32618
Chicago Manual of Style (16th Edition):
Raza, Shahzad. “Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas.” 2012. Masters Thesis, University of Toronto. Accessed April 20, 2021.
http://hdl.handle.net/1807/32618.
MLA Handbook (7th Edition):
Raza, Shahzad. “Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas.” 2012. Web. 20 Apr 2021.
Vancouver:
Raza S. Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/1807/32618.
Council of Science Editors:
Raza S. Characterization of the Reflection and Dispersion Properties of 'Mushroom'-related Structures and their Applications to Antennas. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/32618
Brno University of Technology
6.
Kunz, Jiří.
Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface.
Degree: 2018, Brno University of Technology
URL: http://hdl.handle.net/11012/4774
► This bachelor thesis deals with the analysis of parameters structure tooled surface, it contains their division and description including schematic pictures. Next thesis describes technological…
(more)
▼ This bachelor thesis deals with the analysis of parameters
structure tooled
surface, it contains their division and description including schematic pictures. Next thesis describes technological influence, which them mostly affect, completed detailed description each of them. In next chapter are processed two practical measurements. Both of them are specialized on sizes of selected parameters
structure surface, first measurement is in addition completed about size accuracy. End of thesis is devoted theoretical and recommended values and comparison these values with results previous experiments.
Advisors/Committee Members: Prokop, Jaroslav (advisor), Bumbálek, Bohumil (referee).
Subjects/Keywords: Struktura povrchu; parametry struktury povrchu; technologické podmínky; Structure surface; parameters structure surface; technological conditions
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APA ·
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APA (6th Edition):
Kunz, J. (2018). Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/4774
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):
Kunz, Jiří. “Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface.” 2018. Thesis, Brno University of Technology. Accessed April 20, 2021.
http://hdl.handle.net/11012/4774.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kunz, Jiří. “Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface.” 2018. Web. 20 Apr 2021.
Vancouver:
Kunz J. Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/11012/4774.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kunz J. Technologické vlivy na parametry struktury povrchu obrobené plochy: Technological influence over parameters structure tooled surface. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/4774
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
7.
Streit, Simone.
Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites.
Degree: 2007, Technische Universität Dortmund
URL: http://hdl.handle.net/2003/24580
► The focus of this work is the investigation of the surface properties of supercooled liquids and metal-polymer nanocomposites around the glass transition temperature TG at…
(more)
▼ The focus of this work is the
investigation of the
surface properties of supercooled liquids and
metal-polymer nanocomposites around the glass transition
temperature TG at nanometer length scales. This thesis provides two
major contributions in the field of
surface sensitive x-ray
scattering techniques employed to characterize the behavior of
surface fluctuations in polymeric liquids around TG and the
nanoparticle dynamics in out-of-equilibrium systems. The research
topic of the first part of this thesis consists in the
determination of the cooling rate dependent freezing of capillary
waves on the glass forming liquid poly(propy- lene glycol) by means
of in-situ cooling x-ray reflectivity measurements. The freezing in
of density fluctuations while approaching the glass transition has
been known in the bulk for a long time, but it has not been
determined until now whether an analogous effect also occurs at the
free
surface. Above TG the
surface roughness o can be described by
the standard capillary wave model for simple liquids, whereas the
surface fluctuations are frozen in at temperatures below TG. As the
state of a glass forming liquid strongly depends on its thermal
history, for fast cooling rates this effect occurs at higher
temper- atures than for slow cooling. Large shifts of TG to 240 K
compared to the bulk value of 196 K have been observed. This
represents a significant difference to the bulk where the
dependence of TG on the cooling rate is typically weak. The
temporal evolution of gold nanoparticles moving on the
surface of
thin polystyrene films is investigated in the second part of this
work. As the measurements are performed around the glass transition
of the polymer, the metal-polymer system is out of equilib- rium
and therefore exhibits interesting dynamics. The dynamic
structure
factor f(qjj) of the gold clusters with the lateral wavevector
transfer qjj and the relaxation time is measured with
two-dimensional x-ray photon correlation spectroscopy. There is
cur- rently extensive interest in bulk soft matter systems where a
similar behavior of the dynamic
structure factor and aging
phenomena are observed. Above the glass transition of the polymer
the peculiar modified exponential form f(qjj)..] is found with 0:7
< alpha < 1:9, depending on sample age and
temperature. The relaxation rates scale linearly with qjj,
excluding a simple Brownian diffusive motion. This type of
behavior, already observed in aging bulk soft matter systems, is
explained by a power law distribution of particle velocities due to
ballistic motion.
Advisors/Committee Members: Tolan, M..
Subjects/Keywords: ageing; glas transition; surface
dynamics; surface structure; X-ray scattering; 530
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APA ·
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APA (6th Edition):
Streit, S. (2007). Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites. (Thesis). Technische Universität Dortmund. Retrieved from http://hdl.handle.net/2003/24580
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):
Streit, Simone. “Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites.” 2007. Thesis, Technische Universität Dortmund. Accessed April 20, 2021.
http://hdl.handle.net/2003/24580.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Streit, Simone. “Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites.” 2007. Web. 20 Apr 2021.
Vancouver:
Streit S. Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites. [Internet] [Thesis]. Technische Universität Dortmund; 2007. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/2003/24580.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Streit S. Surface structure and dynamics of
supercooled polymer melts and metal-polymer nanocomposites. [Thesis]. Technische Universität Dortmund; 2007. Available from: http://hdl.handle.net/2003/24580
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
8.
Kim, Sunghan.
Surface Properties of Nanopore-Structured Metals and Oxides.
Degree: PhD, Mechanical Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/187436
► The importance of understanding the properties of textured surfaces is growing with their potential wide engineering applications. In this thesis research, nanopore structures of metals…
(more)
▼ The importance of understanding the properties of textured surfaces is growing with their potential wide engineering applications. In this thesis research, nanopore structures of
metals and oxides were examined to determine the interactions between environmental object and the textured surfaces. The major applications of nanopore structures are micro/nanoelectromechanical systems (MEMS/NEMS), energy devices, sensors, and environmental devices. In order to achieve better performance in each, it needs to consider three critical
surface properties such as
surface forces, electrochemical performances, and wettability. In this research, the
surface properties of nanopore structures have been explored
with understanding the essence of contact. This research uses experimental approach combined with basic analysis in physical principles.
Experiments include fabrication of nanopore structures, investigation of
surface force, electrochemical evaluation, and wetting/electrowetting studies of nanopore structures.
Metallic nanopore structures (MNSs) of nickel were characterized by using an atomic force microscope (AFM) and a triboscope. The mechanisms of bacteria desorption were examined by alumina nanopore structures (ANSs) with various pore sizes. The kinetics of ion-transfer on MNSs was studied using Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltametry (CV).
The (electro-) wetting behavior of MNSs were examined using a droplet shape measurement system.
A physics based analysis was conducted in order to understand the principles of the nanopore effects on environments suitable for various applications. Results lead to the
successful identification of critical geometrical factors. A contact model has been established to understand properties of textured surfaces. Specific design factors, which are related to the
geometry of the textured surfaces has been identified. This research revealed fundamental mechanisms of contact and establish a relationship between morphology/geometry and
surface
properties. The findings in this thesis research afford new approach to optimize applications of textured
surface. The proposed contact models are beneficial to the
surface design and
application of sustainable micro/nanodevices.
This thesis includes eight chapters. The first chapter introduces the background and fundamental knowledge related to current research in order to understand the basics. Followed by the chapter two of motivation and objectives, chapter three discusses materials and
experimental details, chapter four and five cover the
surface forces, chapter six studies the electrochemical performances, chapter seven investigates the (electro-)wettability, and the conclusions and future recommendations are presented in chapter eight.
Advisors/Committee Members: Liang, Hong (advisor), Polycarpou, Andreas A (advisor), Zou, Jun (committee member), Mukherjee, Partha P (committee member).
Subjects/Keywords: nanopore structure; surface property; surface force; electrochemical performance; (electro-)wettability
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APA (6th Edition):
Kim, S. (2015). Surface Properties of Nanopore-Structured Metals and Oxides. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/187436
Chicago Manual of Style (16th Edition):
Kim, Sunghan. “Surface Properties of Nanopore-Structured Metals and Oxides.” 2015. Doctoral Dissertation, Texas A&M University. Accessed April 20, 2021.
http://hdl.handle.net/1969.1/187436.
MLA Handbook (7th Edition):
Kim, Sunghan. “Surface Properties of Nanopore-Structured Metals and Oxides.” 2015. Web. 20 Apr 2021.
Vancouver:
Kim S. Surface Properties of Nanopore-Structured Metals and Oxides. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/1969.1/187436.
Council of Science Editors:
Kim S. Surface Properties of Nanopore-Structured Metals and Oxides. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/187436
Rice University
9.
Luna Singh, Jennifer A.
Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles.
Degree: PhD, Engineering, 2016, Rice University
URL: http://hdl.handle.net/1911/96224
► Self-limiting assembly of nanoparticle arrays promises to revolutionize compliant device fabrication by enabling print-on-demand. Presently, quantitative understanding of the relationship between the array order, nanoparticle…
(more)
▼ Self-limiting assembly of nanoparticle arrays promises to revolutionize compliant device fabrication by enabling print-on-demand. Presently, quantitative understanding of the relationship between the array order, nanoparticle size,
surface characteristics, and process conditions remain elusive. Previous simulations have shown that tuning particle and
surface potentials, screening lengths, and particle concentrations can lead to ordering. However, identifying the experimental conditions to observe these in-plane order-disorder and order-order transitions for nanoparticles remains a challenge. This study focuses on the ordering process during absorption of electrostatically stabilized nanoparticles onto an attractive
surface with varying bulk concentrations of the nanoparticles in solution. The bond orientational correlation function as well as Voronoi and 2D
structure factor analysis is used to determine the transition points between liquid, hexatic, and crystalline nanoparticle arrays. Brownian dynamics simulations demonstrated that the critical effective
surface coverage required for the liquid-hexatic or hexatic-crystalline transition point increases with increasing bulk concentration, while the critical timestep decreases with increasing bulk concentration. To better understand the role of hydrodynamic interactions between the particles simulations using Fast Lubrication dynamics were compared to the Brownian dynamics simulations. Computational cost of Fast Lubrication dynamics is approximately an order of magnitude greater than that of Brownian dynamics. The inclusion of particle-particle hydrodynamic interactions revealed a reduced bulk diffusion coefficient and the stochastic nature of the ordering process. The Fast Lubrication dynamics simulations demonstrate the complex role of not only the bulk concentration but also the bulk solvent on the ordering process. Identifying and understanding these transition points will help elucidate experimental conditions necessary to create high resolution patterns and smaller devices.
Advisors/Committee Members: Bayazitoglu, Yildiz (advisor).
Subjects/Keywords: Adsorption; Colloidal system; Surface phase transitions; Surface structure
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CSE |
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APA (6th Edition):
Luna Singh, J. A. (2016). Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/96224
Chicago Manual of Style (16th Edition):
Luna Singh, Jennifer A. “Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles.” 2016. Doctoral Dissertation, Rice University. Accessed April 20, 2021.
http://hdl.handle.net/1911/96224.
MLA Handbook (7th Edition):
Luna Singh, Jennifer A. “Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles.” 2016. Web. 20 Apr 2021.
Vancouver:
Luna Singh JA. Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles. [Internet] [Doctoral dissertation]. Rice University; 2016. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/1911/96224.
Council of Science Editors:
Luna Singh JA. Simulations of Adsorption and In-plane Ordering of Electrostatically Adsorbed Charged Colloidal Nanoparticles. [Doctoral Dissertation]. Rice University; 2016. Available from: http://hdl.handle.net/1911/96224
10.
Leroy, Jean-François.
Elaborer l'unique à partir du même : Creating the unique from the same.
Degree: Docteur es, SACRe, arts visuels, 2019, Paris Sciences et Lettres (ComUE)
URL: http://www.theses.fr/2019PSLET011
► Emprunté à Marion Delage de Luget et, plus précisément au texte pour l’exposition "Et pour matériau, les standards (La Permanence, Clermond-Ferrand, 2013 / commissariat : Kurt…
(more)
▼ Emprunté à Marion Delage de Luget et, plus précisément au texte pour l’exposition "Et pour matériau, les standards (La Permanence, Clermond-Ferrand, 2013 / commissariat : Kurt forever)", ce titre, « Élaborer l’unique à partir du même », ne constitue pas seulement un sujet mais un principe d’être avec le monde ; il fait directement écho aux formes que je manipule au quotidien. Le même / l’unique : l’objet en série vs l’objet singulier ; l’objet produit vs l’objet expérimenté ; la ressemblance vs la dissemblance. Partir d’une forme commune, d’une forme pauvre de notre temps, se l’approprier, la démembrer, l’associer pour arriver à une forme unique, c’est aussi, d’une certaine manière, refuser l’esprit de système. C’est utiliser le réel pour ne pas le décrire.Aujourd’hui, j’identifie deux grandes catégories de matériaux dans ma pratique : les matériaux industriels qui n’ont pas encore d’histoire(s), de charges qui apparaissent avec fonction de
structure, de construction ; les matériaux récupérés qui constituent le fonds d’atelier, des formes a priori sans qualités qui ont perdu leur valeur d’usage, et donc leur rôle économique. J’utilise donc des « éléments précontraints » (Claude Levi-Strauss) afin d’aboutir à une sorte de bricolage de l’industrie. Dans l’atelier, ce lieu où se rencontrent différents registres de formes, j’exploite le potentiel tant sculptural que pictural de ces « éléments précontraints », en procédant par déduction. Je les réactive en tenant compte de leurs spécificités, format, épaisseur, élasticité, couleur… J’assimile d’ailleurs la couleur à un matériau : la peinture. Il y a trois ans, à l’invitation de Yann Owens de Franciscopolis Edition, j’ai engagé la série All comes from a plan, qui consiste en une tentative de mise à plat de mon travail par le filtre de la sérigraphie. Par la sérigraphie, je tente de synthétiser l’expérience sensible que l’on peut avoir lors de l’appréhension réelle du travail. À aucun moment il n’est question de reproduire les pièces mais plutôt d’en comprendre la généalogie. Une manière de retrouver le pourquoi initial. Dans ce processus d’appropriation, de déplacement, de transformation et de composition, il y a la volonté de créer des objets qui souligneraient à quel point toute forme porte en elle son propre discours, sa propre métaforme. J’ai pensé cette thèse comme une succession d’indices en pratique sur ma pratique. Elle relève donc de l’objet plastique - qui renvoie de manière directe à, plus encore, qui est ma façon de travailler. Cette thèse n’a jamais été envisagée comme pouvant venir compléter la pratique (pire : l’éclairer) ; car elle est elle aussi cette pratique. Elle est pièce, fait pièce, tout comme les pièces sont des objets de recherche.L’édition (présente) relève entièrement de mon processus de travail, elle est constituée de 3 objets imprimés : A. Des notes, mes notes. Arrangées ? Réarrangées ? Ne pas expliquer : ni cela, ni le travail. Refuser la narration, accepter peut-être le récit : celui des matériaux à l’atelier. B. Une documentation…
Advisors/Committee Members: Maldonado, Guitemie (thesis director), Julien, Jacques (thesis director).
Subjects/Keywords: Sculpture; Installation; Surface; Structure; Peinture dans l'espace; Serigraphie; Sculpture; Installation; Surface; Structure; Painting in the space; Serigraphy; 700
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APA (6th Edition):
Leroy, J. (2019). Elaborer l'unique à partir du même : Creating the unique from the same. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2019PSLET011
Chicago Manual of Style (16th Edition):
Leroy, Jean-François. “Elaborer l'unique à partir du même : Creating the unique from the same.” 2019. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed April 20, 2021.
http://www.theses.fr/2019PSLET011.
MLA Handbook (7th Edition):
Leroy, Jean-François. “Elaborer l'unique à partir du même : Creating the unique from the same.” 2019. Web. 20 Apr 2021.
Vancouver:
Leroy J. Elaborer l'unique à partir du même : Creating the unique from the same. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2019. [cited 2021 Apr 20].
Available from: http://www.theses.fr/2019PSLET011.
Council of Science Editors:
Leroy J. Elaborer l'unique à partir du même : Creating the unique from the same. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2019. Available from: http://www.theses.fr/2019PSLET011
11.
Viard, Antoine.
Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application.
Degree: Docteur es, Chimie et physico-chimie des matériaux, 2016, Montpellier
URL: http://www.theses.fr/2016MONTT243
► Les matériaux céramiques se sont énormément développés durant le dernier siècle et ne cessent d'attirer l'attention pour diverses applications. Cela tient aux propriétés nombreuses et…
(more)
▼ Les matériaux céramiques se sont énormément développés durant le dernier siècle et ne cessent d'attirer l'attention pour diverses applications. Cela tient aux propriétés nombreuses et variées qu'elles peuvent présentées. Un avantage certain de ce type de matériaux réside dans leurs stabilités mécanique, thermique et chimique, ce qui en fait des candidats de choix pour des applications dans des environnements sévères. Ceci est notamment observable dans le domaine des membranes. En effet, malgré leurs coût réduit, les membranes polymères, constituant l'essentiel des membranes utilisées à ce jour, sont très sensibles à l'environnement dans lequel elles sont utilisées et nécessitent d'être renouvelées régulièrement. Cela justifie la recherche d'alternatives, comme par exemple les céramiques plus résistantes. Différentes mises en forme sont possibles pour la formation de membranes, mais parmi celles-ci, les formes en tubes ont suscité un engouement certain en raison des avantages en termes de rapport
surface/volume et de la résistance au transport de masse moindre. La majorité des céramiques utilisées et commercialisées reposent sur des compositions chimiques à base d'oxydes. Il apparaît cependant que ces matériaux trouvent leurs limites en termes de vieillissement et de stabilité à très haute température. Un autre type de céramiques, les céramiques non-oxydes à base de silicium, présentent des propriétés très intéressantes, pouvant potentiellement répondre à ces problématiques. De tels matériaux sont produits par la voie PDC (Polymer Derived Ceramic), notamment en raison de l'impossibilité de procéder autrement pour la majorité d'entre eux. Cette méthode consiste à synthétiser des polymères pré-céramiques pouvant être convertis en céramiques par un traitement thermique adéquat. Cela permet notamment un très bon contrôle de la
structure chimique de la céramique finale, et donc une grande versatilité. Parmi ces matériaux, le système quaternaire Si-B-C-N a particulièrement attiré l'attention en raison de ses propriétés thermostructurales couplées à sa stabilité chimique singulière. Les travaux de thèses présents se sont donc focalisés sur l'utilisation de cette céramique. Un autre avantage de la voie des polymères pré-céramiques réside dans les mises en forme rendues possibles par l'utilisation de polymères. Cette méthode a déjà été utilisée abondamment pour produire des fibres céramiques avec des diamètres de l'ordre de la dizaine de microns, notamment par le recours à la technique de filage en fondu (melt-spinning en anglais). L'objectif principal de cette thèse est la production de fibres creuses et de capillaires céramiques SiBCN en se basant sur cette méthode de mise en forme. Le but est la formation de supports membranaires très stables à un coût relativement faible comparé aux procédés généralement utilisés pour la mise en forme de céramiques, impliquant souvent un traitement de frittage à très haute température. Ces supports offriront à terme des applications en séparation de gaz ou en traitement de l'eau. Plus…
Advisors/Committee Members: Bernard, Samuel (thesis director).
Subjects/Keywords: Polymère précéramique; Fibres creuses; Structure; Élaboration; Propriétés; Modification de surface; Polymer derived ceramic; Hollow fibres; Structure; Processing; Properties; Surface modifications
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APA (6th Edition):
Viard, A. (2016). Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2016MONTT243
Chicago Manual of Style (16th Edition):
Viard, Antoine. “Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application.” 2016. Doctoral Dissertation, Montpellier. Accessed April 20, 2021.
http://www.theses.fr/2016MONTT243.
MLA Handbook (7th Edition):
Viard, Antoine. “Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application.” 2016. Web. 20 Apr 2021.
Vancouver:
Viard A. Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application. [Internet] [Doctoral dissertation]. Montpellier; 2016. [cited 2021 Apr 20].
Available from: http://www.theses.fr/2016MONTT243.
Council of Science Editors:
Viard A. Structure, élaboration, propriétés et modification de surface de fibres creuses non-oxydes à partir de polymères pré-céramiques pour des applications membranaires : Design, processing, properties and surface modification of polymer-derived Silicon-containing non-oxide ceramic hollow fibers for membrane application. [Doctoral Dissertation]. Montpellier; 2016. Available from: http://www.theses.fr/2016MONTT243
University of Arkansas
12.
Coleman, Shawn Patrick.
Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models.
Degree: PhD, 2014, University of Arkansas
URL: https://scholarworks.uark.edu/etd/2185
► The objectives of this work are to investigate the structure and energetic stability of different alumina (Al2O3) phases using atomistic simulation and virtual diffraction…
(more)
▼ The objectives of this work are to investigate the
structure and energetic stability of different alumina (Al
2O
3) phases using atomistic simulation and virtual diffraction characterization. To meet these objectives, this research performs molecular statics and molecular dynamics simulations employing the reactive force-field (ReaxFF) potential to model bulk, interface, and
surface structures in the θ-, γ-, κ-, and α-Al
2O
3 system. Simulations throughout this study are characterized using a new virtual diffraction algorithm, developed and implemented for this work, that creates both selected area electron diffraction (SAED) and x-ray diffraction (XRD) line profiles without assuming prior knowledge of the crystal system. First, the transferability of the ReaxFF potential is evaluated by modelling different alumina bulk systems. ReaxFF is shown to correctly predict the energetic stability of α-Al
2O
3 among the crystalline alumina phases, but incorrectly predicts an even lower energy amorphous phase. Virtual XRD patterns uniquely identify each phase and validate the minimum energy bulk structures through experimental comparison. Second, stable and metastable alumina surfaces are studied at 0, 300, 500, and 700 K. ReaxFF predicts minimum energy
surface structures and energies in good agreement with prior studies at 0 K; however, select
surface models at 500 and 700 K undergo significant reconstructions caused by the unnatural bias for a lower-energy amorphous phase. Virtual SAED analysis performed on alumina surfaces allow advanced characterization and direct experimental validation of select models. Third, ReaxFF is used to model homophase and heterophase alumina interfaces at 0 K. Predicted minimum energy structures of α-Al
2O
3 interfaces show good agreement with prior works, which provides the foundation for the first atomistic study of metastable alumina grain boundaries and heterophase alumina interfaces. Virtual SAED patterns characterize select alumina interfaces and help guide the construction of low-energy heterophase alumina interfaces by providing insight into crystallographic compatibilities. Combined, the energetic data extracted from bulk,
surface, and interface simulations as well as insights gained through virtual diffraction will aid the development of mesoscale predictive models of polycrystalline alumina formation during physical vapor deposition.
Advisors/Committee Members: Douglas Spearot, Shui-Qing Yu, Po-Hao Huang.
Subjects/Keywords: Alumina; Atomistic Simulation; Interface Structure; Surface Structure; Virtual Diffraction; Applied Mechanics; Metallurgy; Nanoscience and Nanotechnology
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APA (6th Edition):
Coleman, S. P. (2014). Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2185
Chicago Manual of Style (16th Edition):
Coleman, Shawn Patrick. “Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models.” 2014. Doctoral Dissertation, University of Arkansas. Accessed April 20, 2021.
https://scholarworks.uark.edu/etd/2185.
MLA Handbook (7th Edition):
Coleman, Shawn Patrick. “Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models.” 2014. Web. 20 Apr 2021.
Vancouver:
Coleman SP. Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models. [Internet] [Doctoral dissertation]. University of Arkansas; 2014. [cited 2021 Apr 20].
Available from: https://scholarworks.uark.edu/etd/2185.
Council of Science Editors:
Coleman SP. Atomistic Simulation and Virtual Diffraction Characterization of Alumina Interfaces: Evaluating Structure and Stability for Predictive Physical Vapor Deposition Models. [Doctoral Dissertation]. University of Arkansas; 2014. Available from: https://scholarworks.uark.edu/etd/2185
NSYSU
13.
Chiang, Cheng-Yan.
The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals.
Degree: PhD, Electro-Optical Engineering, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026113-095553
► Discotic liquid crystals can assemble into columnar structure by means of Ï-Ï interaction between molecules. In the highly ordered columnar structure, the charge-carrier mobility along…
(more)
▼ Discotic liquid crystals can assemble into columnar
structure by means of Ï-Ï interaction between molecules. In the highly ordered columnar
structure, the charge-carrier mobility along the discotic columns is high (10â3 â 1 cm2Vâ1sâ1), whereas the mobility in the transverse direction of the column is rather low. Consequently, discotic liquid crystals with a highly ordered columnar
structure can be regarded as a one-dimension conductor, and are particularly suitable for the devices that demand the unidirectional and efficient charge-carrier transport property, such as photovoltaic cells, organic light emitting diodes, organic semiconductors. In the applications mentioned above, a long-range molecular order of discotic liquid crystals and the suitable molecular orientation of discotic columns are demanded in order to enhance the performance for these devices. However, there is no practical and reliable techniques can be used to align the discotic liquid crystals. In this study, we investigate the decisive factors that dominate the molecular arrangement of discotic molecules, and develop the effective techniques for aligning the discotic liquid crystals, in which the discotic mesogen hexaalkoxydibenzo[a,c]phenazine is used as the experimental object.
Firstly, we observed the effect of the cooling procedure on the stacking of discotic molecules. Our experimental results show that a highly ordered molecular stacking of discotic liquid crystals may form when the cooling rate of the discotic layer is controlled to below 0.1 °C/min. Secondly, we studied the effect of the physicochemical properties of substrate on the molecular orientation of discotic molecules. Our investigation results indicate that the
surface free energetic states of substrates play a decisive role in determining the molecular anchoring type of the discotic liquid crystals. We find that the
surface with higher energetic state larger than 60 mJ/m2 supports the disk-face-on anchoring of discotic liquid crystals. With the
surface free energy decreasing, the anchoring type varies. The disk-edge-on anchoring of discotic molecules forms when the
surface free energy of substrate decreases to below a value of 20 mJ/m2.
The homeotropic alignment of discotic liquid crystals can be achieved by increasing the
surface energetic state of substrates and on the help of slowly cooling process; whereas the homogeneous alignment of discotic layers can be obtained by aligning the discotic molecules using the microstructure
surface or the patterned self-assembled monolayers. Our experimental results indicate that, under the conditions that the size of microstructure and the layout of the self-assembled monolayers are well designed, these alignment surfaces can align the discotic molecules into the homogeneous arrangement. Furthermore, the orientation of discotic columns in the discotic layer can be locally controlled, realizing the multi-domain molecular alignment of discotic liquid crystals.
We measured the characteristics of the charge-carrier transport of the aligned…
Advisors/Committee Members: Wenjun Zheng (committee member), Tsung-Hsien Lin (chair), Chi Wi Ong (chair), Chung-Kung Lai (chair), Wei Lee (chair).
Subjects/Keywords: liquid crystal alignment; surface free energy; discotic liquid crystal; patterned self-assembled monolayers; anisotropy of surface free energy; surface topological structure
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APA (6th Edition):
Chiang, C. (2013). The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026113-095553
Chicago Manual of Style (16th Edition):
Chiang, Cheng-Yan. “The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals.” 2013. Doctoral Dissertation, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026113-095553.
MLA Handbook (7th Edition):
Chiang, Cheng-Yan. “The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals.” 2013. Web. 20 Apr 2021.
Vancouver:
Chiang C. The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals. [Internet] [Doctoral dissertation]. NSYSU; 2013. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026113-095553.
Council of Science Editors:
Chiang C. The Study of Effect of Surface Physicochemical Properties on the Alignment of Discotic Liquid Crystals. [Doctoral Dissertation]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1026113-095553
Penn State University
14.
Luo, Jiawei.
Understanding shear-induced hydrolysis reactions on soda lime silica glass surface.
Degree: 2018, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/15252jzl221
► Soda lime silica (SLS) glass is the most widely used glass materials in terms of mass in windows, glass bottles & containers, etc. One of…
(more)
▼ Soda lime silica (SLS) glass is the most widely used glass materials in terms of mass in windows, glass bottles & containers, etc. One of the biggest challenge for SLS glass is its brittleness or prone to be damaged at ambient conditions. One important reason is that cracks propagation on SLS glass
surface can be significantly accelerated by tensile stress induced corrosion reactions of amorphous silicate network, which breaks the Si-O-Si bonds to form two silanol groups, known as stress corrosion effect. It has also been found that stress corrosion reactions are faster with the increase of relative humidity (RH). The propagation of cracks will eventually lead to the failure of SLS glass. However, very little is known on the reactions between glass and water in the environment induced by interfacial shear, which results in the removal of SLS glass.
Recently, it has been found that SLS glass shows unique response to interfacial shear in humid conditions through a ball-on-flat wear test. For most of the commercial flat glasses, including silica, borosilicate glasses, boroaluminosilicate glasses and aluminosilicate glasses, the amount of wear will increase as the humidity level increases. Only SLS glass shows wear resistance at high relative humidity. It is found that shear-induced hydrolysis reactions take place on SLS glass
surface for medium and low RH conditions. Then this shear-induced hydrolysis reaction must be “suppressed” or have similar reaction rates of its reverse reactions (condensation of silanols) at high RH. One hypothesis is that Na+/H+ + H2O exchange could take place at high RH, which creates
surface residual compressive stress at the meantime. Compressive stress which could lower the effective tensile stress on glass
surface, is believed to stabilize or hinder the propagation of cracks. Then the amount of wear could also be lowered if the applied stress is not large enough to induce hydrolysis reactions.
To test this hypothesis and explore the factors that govern the shear-induced reactions on SLS glass
surface, effects of different structural units,
surface mechanical properties and compressive stress, Na+/H+ + H2O exchange are investigated in this dissertation. It should be noted that these factors cannot be easily isolated. Therefore, multiple different treatments need to be performed to modify the
surface chemical structures of SLS glass. These
surface treatments include hydrothermal reactions, leaching in acid solution, thermal poling in controlled environment, ion-exchange with KNO3. The governing factors are determined through correlating the changes in
surface chemical
structure, mechanical properties with the wear behavior. It is found that
surface mechanical properties, compressive stress and alteration layers created by Na+/H+ + H2O exchange are not responsible for SLS glass’s unique wear behavior at high RH. While no specific mechanism has been identified, mobile Na+ cations and silicate network
structure are suggested to be the dominating factors.
To better understand the amorphous…
Advisors/Committee Members: Seong Han Kim, Dissertation Advisor/Co-Advisor, Seong Han Kim, Committee Chair/Co-Chair, Kristen Ann Fichthorn, Committee Member, Manish Kumar, Committee Member, Carlo G. Pantano, Outside Member.
Subjects/Keywords: Soda lime silica glass; surface structure of glass; surface mechanical properties; shear-induced hydrolysis reactions; vibrational spectroscopy; wear behavior; surface chemistry
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APA (6th Edition):
Luo, J. (2018). Understanding shear-induced hydrolysis reactions on soda lime silica glass surface. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15252jzl221
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):
Luo, Jiawei. “Understanding shear-induced hydrolysis reactions on soda lime silica glass surface.” 2018. Thesis, Penn State University. Accessed April 20, 2021.
https://submit-etda.libraries.psu.edu/catalog/15252jzl221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luo, Jiawei. “Understanding shear-induced hydrolysis reactions on soda lime silica glass surface.” 2018. Web. 20 Apr 2021.
Vancouver:
Luo J. Understanding shear-induced hydrolysis reactions on soda lime silica glass surface. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Apr 20].
Available from: https://submit-etda.libraries.psu.edu/catalog/15252jzl221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luo J. Understanding shear-induced hydrolysis reactions on soda lime silica glass surface. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15252jzl221
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Freie Universität Berlin
15.
Feiten, Felix Elias.
Die Oberflächenstruktur von V2O3(0001).
Degree: 2016, Freie Universität Berlin
URL: http://dx.doi.org/10.17169/refubium-5788
► Vanadiumoxide sind weit verbreitete Katalysatoren in industriellen Reaktionen. Die katalytische Aktivität eines Materials beruht auf seiner Oberflächenstruktur. Während die katalytische Aktivität von V2O3(0001) gezeigt wurde,…
(more)
▼ Vanadiumoxide sind weit verbreitete Katalysatoren in industriellen Reaktionen.
Die katalytische Aktivität eines Materials beruht auf seiner
Oberflächenstruktur. Während die katalytische Aktivität von V2O3(0001) gezeigt
wurde, wurde die Oberflächenterminierung von V2O3(0001) Filmen umstritten,
seit Ionenstreuversuche nahelegten, dass diese Oberfläche von einer
Dreifachlage Sauerstoff terminiert ist. Dies steht im Widerspruch zu der zuvor
weit verbreiteten Ansicht, dass die Oberfläche von einer vollständigen Lage
von Vanadylgruppen belegt ist. In dieser Dissertation wurde die
Oberflächenstruktur von V2O3(0001) Filmen mit kombinierten I/V-LEED und STM
Messungen bestimmt, um diesen Widerspruch aufzulösen. Die Analyse einer
Vielzahl von Präparationen zeigt, dass die Filme von einer kompletten Lage
Vanadylgruppen, mit lokalen Defekten, terminiert sind. Die Vanadyl-
terminierten Oberflächen können zu Oberflächen mit partieller Vanadyl-Belegung
oxidiert werden, welche eine Superzelle aufweisen. Oxidation von Filmen die
solch eine Superzelle haben führt zur Bildung und zum Verdampfen von V2O5.
Diese Ergebnisse wurden mit übereinstimmenden Ergebnissen von Jan Seifert et
al. und Joachim Paier et al. kombiniert, welche durch Streuung von schnellen
Atomen bzw. Dichtefunktionaltheorie-Rechnungen erhalten wurden. Es wurde auch
die Oberflächenstruktur von durch Elektronenbeschuss reduzierten V2O3(0001)
Filmen bestimmt. Diese Oberflächen zeigen eine Koexistenz von zwei Phasen:
Eine geordnete und eine ungeordnete. Die geordnete Phase konnte als
Einfachlage von Vanadiumatomen auf einer Dreifachlage Sauerstoff identifiziert
werden.
Advisors/Committee Members: m (gender), Prof. Dr. Hans-Joachim Freund (firstReferee), Prof. Dr. Thomas Risse (furtherReferee).
Subjects/Keywords: surface structure; surface science; V2O3; LEED; I/V-LEED; STM; vanadium oxide; surface crystallography; catalysis; 500 Naturwissenschaften und Mathematik::540 Chemie
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APA (6th Edition):
Feiten, F. E. (2016). Die Oberflächenstruktur von V2O3(0001). (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-5788
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):
Feiten, Felix Elias. “Die Oberflächenstruktur von V2O3(0001).” 2016. Thesis, Freie Universität Berlin. Accessed April 20, 2021.
http://dx.doi.org/10.17169/refubium-5788.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Feiten, Felix Elias. “Die Oberflächenstruktur von V2O3(0001).” 2016. Web. 20 Apr 2021.
Vancouver:
Feiten FE. Die Oberflächenstruktur von V2O3(0001). [Internet] [Thesis]. Freie Universität Berlin; 2016. [cited 2021 Apr 20].
Available from: http://dx.doi.org/10.17169/refubium-5788.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Feiten FE. Die Oberflächenstruktur von V2O3(0001). [Thesis]. Freie Universität Berlin; 2016. Available from: http://dx.doi.org/10.17169/refubium-5788
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
16.
Hsu, Chia-Hsiu.
Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study.
Degree: PhD, Physics, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-130831
► Atomic and electronic structures of metal overlayers on the Si(111) surface were studied by first-principles calculations. For the one-dimensional metal atomic wires on Si(111), we…
(more)
▼ Atomic and electronic structures of metal overlayers on the Si(111)
surface were
studied by first-principles calculations. For the one-dimensional metal atomic wires
on Si(111), we first revisited and examined the models with a honeycomb chain
feature for the Au/Si(111)-(5Ã2)
surface reconstruction systematically. Our newly
identified model reproduces certain key features in the angle-resolved photoemission
spectroscopy (ARPES) measurement and experimental scanning tunneling microscope
(STM) images. Next, similarly structural models for the Ag/Si(111)-c(12Ã2)
phase were also identified from a systematic search. The mechanisms of phase transitions from 3Ã1 to 6Ã1 and from 6Ã1 to c(12Ã2) have also been examined. The
simulated STM images of this c(12Ã2) model is in excellent agreement with the experimental STM images. On the other hand, for two dimensional metal overlayers
grown on Si(111), the band structures of Pb/Si(111)-â7Ãâ3
surface reconstruction
were analyzed in detail, and are in good agreement with the identified bands in the
experimental study. Finally, we discuss the 2Ã2 graphene on SiC(0001)-â3Ãâ3.
It becomes a buffer layer when graphene growth on SiC(0001) suface, and the Dirac
point of graphene will disappear. However, by intercalating Bi or Sb layer to become
a buffer layer make the Dirac cone of graphene will preserved. On the other hand,
for the Bi and Sb buffer layer the Ï and Ï* bands of the graphene exhibit spinâorbit
(SO) splitting will be shown.
Advisors/Committee Members: Feng-Chuan Chuang (committee member), Wei-Feng Tsai (chair), Ya-Ping Chiu (chair), Chien-Cheng Kuo (chair), Wen-Jay Lee (chair).
Subjects/Keywords: Si(111); SiC(0001); graphene; band structure; first-principles; surface reconstruction
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APA (6th Edition):
Hsu, C. (2013). Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-130831
Chicago Manual of Style (16th Edition):
Hsu, Chia-Hsiu. “Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study.” 2013. Doctoral Dissertation, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-130831.
MLA Handbook (7th Edition):
Hsu, Chia-Hsiu. “Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study.” 2013. Web. 20 Apr 2021.
Vancouver:
Hsu C. Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study. [Internet] [Doctoral dissertation]. NSYSU; 2013. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-130831.
Council of Science Editors:
Hsu C. Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study. [Doctoral Dissertation]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0630113-130831
NSYSU
17.
Syu, Wun-hong.
Development of Four-phase Micro Coupler Using MEMS Technology.
Degree: Master, Electrical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1131114-143913
► In order to improve the high insertion loss of traditional silicon-based stack coupler and non-four-phase output characteristics. This thesis presents the planar suspended four-phase quadrature…
(more)
▼ In order to improve the high insertion loss of traditional silicon-based stack coupler and non-four-phase output characteristics. This thesis presents the planar suspended four-phase quadrature coupler utilizing
surface micromachining technology to reduce insertion loss and compact size, and can be applied to the manufacturing of the front-end receiver for next-generation mobile communication systems.
To achieve the four-phase quadrature coupler with four-phase output, low insertion loss and high isolation characteristics, the main fabrication processes in this thesis including: (i) utilize suspended
structure to reduce the insertion loss caused by parasitic capacitance between device and substrate, (ii) construct of a tandem coupler with center-tapped balun to perform four-phase output, (iii) use the air dielectric layer of MIM capacitors input/output ports matching by employing high frequency simulation software (HFSS and ADS) to optimize the analysis of the coupler. The suspended four-phase quadrature coupler constructed of supported post, bottom electrodes, vias and top electrodes. The main fabrication processes including four thin-film depositions, four graphic definitions of photolithography, four copper electroplating and etching processes.
The chip size of the suspended four-phase quadrature coupler is 22 mmÃ12.8 mmÃ71 µm, and measured by network analyzer under frequency range from10 MHz ~ 4 GHz. First generation of suspended coupler result of measurement shows its center frequency is 825 MHz, the insertion loss of four output ports are -41, -44.7, -44.7 and -44.7 dB, the phases of four output ports are 88°, 21.7°, -74.7° and -175.3°, input return loss and isolation are -3.9 and -32 dB, respectively. Second generation of suspended coupler with the improvement of slotting cavities on the ground plane
structure. The measurement results show the center frequency is 1.05 GHz, insertion loss of four output ports are -45, -47.9, -49.8 and -51.6 dB, input return loss of -4.53 dB, isolation of -37.7 dB, and the phase of four output ports are 138°, 56.1°, -25.9° and -145°. Obviously, the insertion loss and phase of bandwidth can be further increased and more close to the simulation.
Advisors/Committee Members: Jin-Chern Chiou (chair), I-Yu Huang (committee member), Wei-Leun Fang (chair), Yu-Cheng Lin (chair).
Subjects/Keywords: suspended structure; surface micromachining; four-phase; coupler; RF-MEMS
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Syu, W. (2015). Development of Four-phase Micro Coupler Using MEMS Technology. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1131114-143913
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):
Syu, Wun-hong. “Development of Four-phase Micro Coupler Using MEMS Technology.” 2015. Thesis, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1131114-143913.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Syu, Wun-hong. “Development of Four-phase Micro Coupler Using MEMS Technology.” 2015. Web. 20 Apr 2021.
Vancouver:
Syu W. Development of Four-phase Micro Coupler Using MEMS Technology. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1131114-143913.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Syu W. Development of Four-phase Micro Coupler Using MEMS Technology. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1131114-143913
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
18.
Tang, Ming-Ru.
Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array.
Degree: Master, Electrical Engineering, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0608114-140456
► In this letter presents the effect of surface plasmon polaritons (SPPs) and ap-plied to thermal emitter. First, the sample Ag/SiO2/Ag plasmonic thermal emitter (ASA-PTE) were…
(more)
▼ In this letter presents the effect of
surface plasmon polaritons (SPPs) and ap-plied to thermal emitter. First, the sample Ag/SiO2/Ag plasmonic thermal emitter (ASA-PTE) were fabricated by using photolithography and evaporation proce-dures. There have three different designed. Different thickness of Ag film (10, 11, 15 and 18 nm). The dimple Ag film (a = 3, 5 μm, D = 2μm, L = 2μm) or not. Different thickness of SiO2 cavity (100, 520, 900 and 2000 nm). Analyzed SPPs by the emittance and efficiency. The thermal emission spectra and dispersion relations of reflection spectra are measured by Perkin Elmer 2000 Fourier Transfer Infrared (FTIR) and Bruker IFS 66 v/s FTIR. We designed 10 nm to 15 nm dimple Ag coupling layer and enhance the emission intensity. When the size a = 3μm, D = 2μm, heating temperature 100â, 150â and 200â, the emission power are 22.4 mW/cm2, 31.2 mW/cm2 and 42.3 mW/cm2 respectively. And the size a = 5 μm, L=2μm, heating temperature 100â, 150â and 200â, the emis-sion power are up to 43.2 mW/cm2, 63.4 mW/cm2 and 79.3 mW/cm2 respec-tively. Prove that the
surface plasmons can efficiently applied to thermal emit-ter. The future work is combine with Biomedical application.
Advisors/Committee Members: Mu-Jen Lai (chair), Jyi-Tsong Lin (committee member), Wei-Chen Tu (chair), Yi-Tsung Chang (committee member), Lung-Chien Chen (chair).
Subjects/Keywords: Dimple structure; Dual E-Beam Evaporation; Sputter; Surface plasmon; Thermal emitter
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APA ·
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APA (6th Edition):
Tang, M. (2014). Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0608114-140456
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):
Tang, Ming-Ru. “Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array.” 2014. Thesis, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0608114-140456.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tang, Ming-Ru. “Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array.” 2014. Web. 20 Apr 2021.
Vancouver:
Tang M. Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0608114-140456.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tang M. Emission Enhancement in Ag/SiO2/Ag Infrared Thermal Emitter by Using a Hexagonal Dimple Array. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0608114-140456
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
19.
Li , Tsung-Hsun.
Analysis on electro-optical modulation of liquid crystal on a metallic grating structure.
Degree: Master, Electro-Optical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1014115-210850
► Surface plasmon resonance (SPR) is sensitive to surface structure, metal thickness or refraction index of medium layer. Liquid crystal is anisotropic, and optically, the refraction…
(more)
▼ Surface plasmon resonance (SPR) is sensitive to
surface structure, metal thickness or refraction index of medium layer.
Liquid crystal is anisotropic, and optically, the refraction index of light is related to its direction and polarization.
In this research, the birefringent nematic liquid crystal (NLC) with uniaxial crystal
structure, E7, was injected to a liquid crystal cell with metallic gratings, and placed on a prism with Kretschmann
structure. From the characteristics of electro-optical modulation of liquid crystal, E7 was used to serve as the switch which can couple
surface plasma wave. Pumping light source was controlled to be coupled or un-coupled by changing the refraction index of liquid crystal, and SPR mode effect modulated by liquid metal would be reached.
Advisors/Committee Members: Tsung-Hsien Lin (chair), Yuan-Yao Lin (chair), Jui-Hung Hsu (chair), Yu-Ju Hung (committee member).
Subjects/Keywords: Kretschmann structure; Surface plasmon resonance; Anisotropic; Birefringence; Liquid crystals
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APA ·
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Manager
APA (6th Edition):
Li , T. (2015). Analysis on electro-optical modulation of liquid crystal on a metallic grating structure. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1014115-210850
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):
Li , Tsung-Hsun. “Analysis on electro-optical modulation of liquid crystal on a metallic grating structure.” 2015. Thesis, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1014115-210850.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Li , Tsung-Hsun. “Analysis on electro-optical modulation of liquid crystal on a metallic grating structure.” 2015. Web. 20 Apr 2021.
Vancouver:
Li T. Analysis on electro-optical modulation of liquid crystal on a metallic grating structure. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1014115-210850.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Li T. Analysis on electro-optical modulation of liquid crystal on a metallic grating structure. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1014115-210850
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
20.
Lu, Yu-Chun.
Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film.
Degree: Master, Electro-Optical Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822112-185441
► Surface-enhanced Raman scattering (SERS) effect on Ag films with different morphology is studied. We varied the deposition rates and also proposed a new method to…
(more)
▼ Surface-enhanced Raman scattering (SERS) effect on Ag films with different morphology is studied. We varied the deposition rates and also proposed a new method to control the nano-gaps on the silver island film. By bending the glass substrates during film deposition, we can control the gap width on the fractal Ag film. The measured SERS intensity is related to the metal film morphology and we found that the gap width is the dominant factor to analyze the SERS signal. The 3-layer metal-insulator-metal
structure is simulated and the E-field intensity with different gaps fits to our measurement results.
Advisors/Committee Members: Min-Hsiung Shih (chair), Yu-Ju Hung (committee member), Chao-Kuei Lee (chair).
Subjects/Keywords: SERS; surface plasmon; Raman scattering; silver island film; MIM structure
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APA (6th Edition):
Lu, Y. (2012). Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822112-185441
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):
Lu, Yu-Chun. “Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film.” 2012. Thesis, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822112-185441.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Yu-Chun. “Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film.” 2012. Web. 20 Apr 2021.
Vancouver:
Lu Y. Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822112-185441.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu Y. Study of Surface-Enhanced Raman Spectrum (SERS) on Silver Island Film. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822112-185441
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
21.
Liao, Jhe-Yi.
Fabrication and Discussion on Nano-Metal Structure.
Degree: Master, Electro-Optical Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830112-214915
► Abstract Negative index structures could be implemented through surface Plasmon polariton waves generated by nanostructures. We are interested in PMMA grating structure on curved metal…
(more)
▼ Abstract
Negative index structures could be implemented through
surface Plasmon polariton waves generated by nanostructures. We are interested in PMMA grating
structure on curved metal
surface. In order to fabricate this kind of samples, a series process parameters have been tested and also the lift-off process has been developed. Our results show superlens effect under optical microscope(OM). The sub-wavelength grating image is reconstructed in the non-grating region where the PMMA dielectric layer is not uniform.
Surface Plasmon(SPP) waves generated in the grating region propagate to the non-grating region and are scattered out through the non-uniform PMMA layer. The grating information is not resolvable under OM but clear in the reconstructed region. It shows that SPP waves can show super resolution and a simple batch process should be developed in the future.
Advisors/Committee Members: Chao-Kuei Lee (chair), Yu-Ju Hung (committee member), Min-Hsiung Shih (chair).
Subjects/Keywords: superlens; surface plasma; lift-off; E-beam lithography; nano structure
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APA (6th Edition):
Liao, J. (2012). Fabrication and Discussion on Nano-Metal Structure. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830112-214915
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):
Liao, Jhe-Yi. “Fabrication and Discussion on Nano-Metal Structure.” 2012. Thesis, NSYSU. Accessed April 20, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830112-214915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liao, Jhe-Yi. “Fabrication and Discussion on Nano-Metal Structure.” 2012. Web. 20 Apr 2021.
Vancouver:
Liao J. Fabrication and Discussion on Nano-Metal Structure. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Apr 20].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830112-214915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liao J. Fabrication and Discussion on Nano-Metal Structure. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830112-214915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Verma, Archana.
Response surface designs undersplit plot
structure;.
Degree: Statistics, 2012, University of Delhi
URL: http://shodhganga.inflibnet.ac.in/handle/10603/28352
Subjects/Keywords: SURFACE DESIGNS; SPLIT PLOT STRUCTURE
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APA (6th Edition):
Verma, A. (2012). Response surface designs undersplit plot
structure;. (Thesis). University of Delhi. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/28352
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):
Verma, Archana. “Response surface designs undersplit plot
structure;.” 2012. Thesis, University of Delhi. Accessed April 20, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/28352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Verma, Archana. “Response surface designs undersplit plot
structure;.” 2012. Web. 20 Apr 2021.
Vancouver:
Verma A. Response surface designs undersplit plot
structure;. [Internet] [Thesis]. University of Delhi; 2012. [cited 2021 Apr 20].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/28352.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Verma A. Response surface designs undersplit plot
structure;. [Thesis]. University of Delhi; 2012. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/28352
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – San Diego
23.
Zhang, Boyao.
Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering.
Degree: Materials Sci and Engineering, 2015, University of California – San Diego
URL: http://www.escholarship.org/uc/item/9dq79047
► We present a detailed study of the devitrification behavior of five Ni-based amorphous metal foils of different compositions, consolidated using spark plasma sintering (SPS) or…
(more)
▼ We present a detailed study of the devitrification behavior of five Ni-based amorphous metal foils of different compositions, consolidated using spark plasma sintering (SPS) or pressureless sintering. Samples of approximately 5 mm thickness and 20 mm in diameter were prepared by stacking layers of amorphous foil on top of each other. The sintering temperatures were based on the crystallization temperatures (Tx) for each sample as determined from differential scanning calorimetry (DSC). Through detailed X-ray diffraction (XRD) analysis, full-width-half-maximum (FWHM) measurements and DSC analysis, we observed that the width of the 100% diffraction peak decreased with increasing temperature. The changes in FWHM with temperature correspond to similar exothermic crystallization reaction stages observed in DSC analysis. In addition, differences in crystallization kinetics were noticed for samples sintered by SPS versus samples sintered in ambient atmosphere using an external heat source (free sintering). Microstructure analysis of the samples by scanning electron microscopy shows the extent of sintering between the foil layers and bonding mechanisms with different sintering methods. Unique morphologies with positive effect on foil bonding were observed when consolidating foils using SPS.
Subjects/Keywords: Materials Science; Amorphous metal; Devitrification; Spark plasma sintering; Surface structure
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APA (6th Edition):
Zhang, B. (2015). Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/9dq79047
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):
Zhang, Boyao. “Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering.” 2015. Thesis, University of California – San Diego. Accessed April 20, 2021.
http://www.escholarship.org/uc/item/9dq79047.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Boyao. “Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering.” 2015. Web. 20 Apr 2021.
Vancouver:
Zhang B. Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering. [Internet] [Thesis]. University of California – San Diego; 2015. [cited 2021 Apr 20].
Available from: http://www.escholarship.org/uc/item/9dq79047.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang B. Devitrification behavior and interface microstructure of Ni-based amorphous metal during spark plasma sintering. [Thesis]. University of California – San Diego; 2015. Available from: http://www.escholarship.org/uc/item/9dq79047
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – Riverside
24.
LI, YANG.
The Effect of Platinum Surface Structure in the Oxidation of Glycerol.
Degree: Chemistry, 2014, University of California – Riverside
URL: http://www.escholarship.org/uc/item/53k8n0mm
► The surface structures of catalysts have in some instances a large impact on their catalytic properties. On the other hand, historically, mild reactions are not…
(more)
▼ The surface structures of catalysts have in some instances a large impact on their catalytic properties. On the other hand, historically, mild reactions are not considered to be surface structure sensitive. In this thesis we report on our observation that both the size and the shape of Pt nanoparticles strongly affect the selectivity of glycerol oxidation, a reaction that can proceed at low temperature and under atmospheric pressures. In a series of experiment using Pt/SiO2 catalysts with average particle sizes varying from 3.9 to 5.7 nm, it was determined that selectivity toward primary carbon oxidation increases as the proportion of larger particles increases. Together with CO IR titration result, these results appears to indicate that larger Pt particles with flat surfaces and extensive fractions of atop and bridge sites may promote primary carbon oxidation, whereas edge, corner, and other low-coordination Pt sites may promote secondary carbon oxidation. Further catalyst characterization and kinetic experiments will be needed to confirm this tentative conclusion. Tetrahedral- and cuboctahedral-shaped Pt catalysts were also tested for the glycerol oxidation reaction, and cuboctahedral-shaped Pt nanoparticles were found to display higher activity and higher selectivity toward primary carbon oxidation.
Subjects/Keywords: Physical chemistry; catalysis; glycerol oxidation; selectivity; surface structure
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APA (6th Edition):
LI, Y. (2014). The Effect of Platinum Surface Structure in the Oxidation of Glycerol. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/53k8n0mm
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):
LI, YANG. “The Effect of Platinum Surface Structure in the Oxidation of Glycerol.” 2014. Thesis, University of California – Riverside. Accessed April 20, 2021.
http://www.escholarship.org/uc/item/53k8n0mm.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
LI, YANG. “The Effect of Platinum Surface Structure in the Oxidation of Glycerol.” 2014. Web. 20 Apr 2021.
Vancouver:
LI Y. The Effect of Platinum Surface Structure in the Oxidation of Glycerol. [Internet] [Thesis]. University of California – Riverside; 2014. [cited 2021 Apr 20].
Available from: http://www.escholarship.org/uc/item/53k8n0mm.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
LI Y. The Effect of Platinum Surface Structure in the Oxidation of Glycerol. [Thesis]. University of California – Riverside; 2014. Available from: http://www.escholarship.org/uc/item/53k8n0mm
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Michigan
25.
Li, Yaoxin.
Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces.
Degree: PhD, Chemistry, 2017, University of Michigan
URL: http://hdl.handle.net/2027.42/138790
► Biomolecular decorated surfaces have shown great potential in many applications ranging from antimicrobial coatings to biosensing and biofuels due to their excellent properties. The performance…
(more)
▼ Biomolecular decorated surfaces have shown great potential in many applications ranging from antimicrobial coatings to biosensing and biofuels due to their excellent properties. The performance of such biomolecular functionalized surfaces is largely dependent on the molecular
structure of
surface immobilized biomolecules, the surfaces used for attachment, and the surrounding environment biomolecules are functioning in. Moreover, maintaining the functions of such biomolecular surfaces in the absence of bulk water is challenging but important for extending the applications of such surfaces to non-aqueous environment. In order to have an in-depth understanding of how such biomolecule immobilized surfaces should be designed with optimized functions, molecular level characterization needs to be done to reveal the structures of interfacial biomolecules. Here my thesis research mainly focuses on the investigations of structures (conformations and orientations) of immobilized peptides and proteins at the molecular level using sum frequency generation vibrational spectroscopy (SFG), supplemented by circular dichroism (CD) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The relations of structures and functions of the biomolecular surfaces are elucidated.
I first studied the effect of the immobilization site (e.g., N- or C-terminus) on the
structure and activity of
surface immobilized antimicrobial peptide (AMP) MSI-78 using a combination of SFG, CD, coarse grained MD simulation, and antibacterial testing. This peptide exhibits similar secondary
structure but different orientations when immobilized with different termini, leading to varied antibacterial activity. In order to determine whether a peptide could be engineered to assume a different orientation (standing up instead of lying down), a combined coarse grained MD simulation/SFG approach was developed to design AMPs with controlled orientations after
surface immobilization.
To extend this research into more complicated systems, surfaces immobilized with enzymes were characterized using SFG and coarse grained MD simulation. Results show that not only can the orientation of these immobilized enzymes be controlled by selecting the
surface immobilization site, but this
surface orientation can dictate the enzymatic activity. The enzymatic activity is also affected by the property of the underlined
surface for enzyme immobilization. With a more hydrophilic
surface, a better enzymatic activity was observed.
Thirdly, methods of retaining the
structure and function of immobilized biomolecules in the absence of bulk water were developed. Both native secondary
structure and orientation of
surface immobilized biomolecules can be retained and controlled by physically attached sugar coatings and chemically co-immobilized poly-saccharide molecules. Chemically tethered sugar was found to be able to enhance the antibacterial activity of immobilized AMPs in dry conditions.
Lastly, the interfacial structures of protein therapeutics adsorbed at…
Advisors/Committee Members: Chen, Zhan (committee member), Gafni, Ari (committee member), Kennedy, Robert T (committee member), Marsh, E Neil G (committee member).
Subjects/Keywords: surface/interface; peptide/protein; vibrational spectroscopy; orientation; structure; activity; Chemistry; Science
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Manager
APA (6th Edition):
Li, Y. (2017). Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/138790
Chicago Manual of Style (16th Edition):
Li, Yaoxin. “Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces.” 2017. Doctoral Dissertation, University of Michigan. Accessed April 20, 2021.
http://hdl.handle.net/2027.42/138790.
MLA Handbook (7th Edition):
Li, Yaoxin. “Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces.” 2017. Web. 20 Apr 2021.
Vancouver:
Li Y. Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces. [Internet] [Doctoral dissertation]. University of Michigan; 2017. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/2027.42/138790.
Council of Science Editors:
Li Y. Structural and Functional Studies of Peptide and Protein On Engineered Surfaces/Interfaces. [Doctoral Dissertation]. University of Michigan; 2017. Available from: http://hdl.handle.net/2027.42/138790
Penn State University
26.
Murphy, Kelly Ann.
Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/20489
► One of the most promising options for long-term storage of radioactive waste is vitrification, or immobilization in a glass matrix. The viability of this storage…
(more)
▼ One of the most promising options for long-term storage of radioactive waste is vitrification, or immobilization in a glass matrix. The viability of this storage method is evaluated by exposure of the glass to corrosive conditions. Previous work has indicated that alteration layers, which may be protective in nature, form on the glass
surface. Solid-state nuclear magnetic resonance (NMR) spectroscopy is an ideal tool to study the alteration layers because this technique provides structural and (indirectly) compositional information. Moreover, inherent properties of the glass can be exploited to differentiate between the alteration layers and bulk glass via cross-polarization magic angle spinning (CP-MAS) NMR.
Initial characterization suggested the alteration layers formed on two glass compositions were comprised of a hydrated glass layer (barrier between pristine glass and gel layer) and a nano-porous gel layer (directly in contact with solution). The former contained hydrated versions of all components in the pristine, non-corroded glass. Only certain components such as silicon and aluminum, however, were retained in the gel layer. Experimental conditions such as glass composition and form (powder versus fiber) have been shown to influence the composition and
structure of the alteration layers. After formation, the alteration layers continue to interact with solution species due to an established dynamic equilibrium. Through isotopic labeling and solution swapping experiments, recondensation of aqueous silicon onto the powder
surface was observed at short and long equilibration periods. Boron sorption after release to solution was also observed for one glass composition. The questions probed in these studies suggest that the solution-
surface interface is constantly evolving. Therefore, future work in the field should continue to strive towards mimicking environmental conditions and attempting to answer fundamental questions about water-glass interactions.
Advisors/Committee Members: Karl Todd Mueller, Dissertation Advisor/Co-Advisor, Karl Todd Mueller, Committee Chair/Co-Chair, Carlo G Pantano, Dissertation Advisor/Co-Advisor, Miriam Arak Freedman, Committee Member, Danny Glynn Sykes, Committee Member, James David Kubicki, Committee Member.
Subjects/Keywords: NMR; Alteration layers; Surface structure; Nuclear waste glasses; Corrosion
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APA (6th Edition):
Murphy, K. A. (2014). Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/20489
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):
Murphy, Kelly Ann. “Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance.” 2014. Thesis, Penn State University. Accessed April 20, 2021.
https://submit-etda.libraries.psu.edu/catalog/20489.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Murphy, Kelly Ann. “Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance.” 2014. Web. 20 Apr 2021.
Vancouver:
Murphy KA. Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Apr 20].
Available from: https://submit-etda.libraries.psu.edu/catalog/20489.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Murphy KA. Characterizing the Alteration Layers on Nuclear Waste Glasses by Solid-State Nuclear Magnetic Resonance. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/20489
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
RMIT University
27.
Revell, L.
A decorative effect.
Degree: 2012, RMIT University
URL: http://researchbank.rmit.edu.au/view/rmit:160379
► This research project investigates the influence of decoration and decorating on a fashion design practice, exploring the transformative effects of both in relation to surface…
(more)
▼ This research project investigates the influence of decoration and decorating on a fashion design practice, exploring the transformative effects of both in relation to surface and structure. Decoration is considered an after-effect, something that can be differentiated from the object it adheres to, sometimes making it superfluous to the object’s function. This project considers decoration as having its own function – the ability, through its link to the ‘exterior’ world, to transform the shape, appearance and context of materials and objects by modifying their façade. It is proposed that the act of decorating organises singular and disparate elements and transforms them into a whole which within the framework of this research is the garment. Gottfried Semper’s theories underpin this project. He proposes that it is the decorative cover, and not the hidden structure, which expresses the purpose, the nature and the origin of the object, and that the object itself results from the primeval urge to create order through decorating. In the practical experiments pursued as part of this project, these ideas are tested by investigating various examples of lace. Lace is regarded not only as a decorative cover but also symbolic of the act of decorating itself, in the manner by which it takes individual elements to create a unified whole, a characteristic embedded in its process of manufacture, with bobbin lace an example. In response to the initial investigations into decoration, ideas of replication, individualisation and transformation, are explored, in both the practical experiments and in the text, through an analogy between the decorated cake and the clothed body and decorated garment. This is contextualised against the writings of Robin Boyd, who expresses contempt at the act of changing the shape and appearance of manufactured objects through decoration, a process he terms Featurism. The findings of this research propose that decoration and decorating can inform fashion design practice. Decoration can be adjunct to the surface or structure of garments but it need not be a secondary consideration, and ultimately it is decoration and decorating that can be the catalyst in the design process either by representing an idea or through analysing its methods of manufacture to inform ways in which disparate elements can be combined to create a singular outcome.
Subjects/Keywords: Fields of Research; Decoration; surface; structure; lace; fashion
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Manager
APA (6th Edition):
Revell, L. (2012). A decorative effect. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160379
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):
Revell, L. “A decorative effect.” 2012. Thesis, RMIT University. Accessed April 20, 2021.
http://researchbank.rmit.edu.au/view/rmit:160379.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Revell, L. “A decorative effect.” 2012. Web. 20 Apr 2021.
Vancouver:
Revell L. A decorative effect. [Internet] [Thesis]. RMIT University; 2012. [cited 2021 Apr 20].
Available from: http://researchbank.rmit.edu.au/view/rmit:160379.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Revell L. A decorative effect. [Thesis]. RMIT University; 2012. Available from: http://researchbank.rmit.edu.au/view/rmit:160379
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
28.
Xie, Jiayi.
Inferring the Oriented Elastic Tensor from Surface Wave Observations.
Degree: PhD, Physics, 2016, University of Colorado
URL: https://scholar.colorado.edu/phys_gradetds/175
► Seismic anisotropy yields important constraints on the character of past and present deformation of the Earth’s interior. It is therefore of great interest to…
(more)
▼ Seismic anisotropy yields important constraints on the character of past and present deformation of the Earth’s interior. It is therefore of great interest to seismologists. In this thesis, I develop and apply a new method to estimate the tilted elastic tensor for a hexagonally symmetric medium based on seismic
surface wave (i.e. Rayleigh and Love waves) data. I apply the method to infer crustal anisotropy in the western US and eastern Tibet. The goal is to obtain more accurate and reliable information about the anisotropic properties of the Earth’s crust to help improve the understanding of crustal composition and past deformation. In terms of method development, my inversion technique simultaneously reconciles observations of
surface wave azimuthal and radial anisotropy to provide novel information about the inherent anisotropy and the orientation of the foliated anisotropic material that composes Earth's crust. My inferences occur within the framework of a Bayesian Monte Carlo inversion, which yields posterior distributions for the components of the elastic tensor and its orientation and naturally propagates data uncertainties into model uncertainties. In terms of application of the methodology, I process seismic data from several arrays in the US and China (USArray, PASSCAL, CEArray, ChinaArray) recorded between the years 2000 and 2012 to obtain high resolution measurements of Rayleigh and Love wave phase speeds and the azimuthal variation of Rayleigh wave phase speeds. Data in both regions can be fit well simultaneously by a tilted hexagonally symmetric medium. The resulting models of the tilted elastic tensor are geologically correlated. An example result is that in the interior of eastern Tibet, where the crust is thicker than elsewhere in the world, I infer a shallowly dipping middle-to-lower crust that I believe is caused by ductile deformation underlying a steeply dipping upper crust that I believe reflects brittle deformation. In contrast, near the periphery of the Tibetan Plateau the foliation is moderately-to-steeply dipping throughout the entire crust, which may reflect the redirection and shearing of crustal flows imposed by less deformable media surrounding Tibet. The spatial and vertical variations of the estimated elastic tensor and its orientation may provide new insights into the composition and deformation history of Tibetan Plateau in the future.
Advisors/Committee Members: Michael H. Ritzwoller, Shijie Zhong, Michael A. Calkins, Craig H. Jones, Vera Schulte-Pelkum.
Subjects/Keywords: anisotropy; crustal structure; seismology; surface wave; Geophysics and Seismology
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APA ·
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Export
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APA (6th Edition):
Xie, J. (2016). Inferring the Oriented Elastic Tensor from Surface Wave Observations. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/175
Chicago Manual of Style (16th Edition):
Xie, Jiayi. “Inferring the Oriented Elastic Tensor from Surface Wave Observations.” 2016. Doctoral Dissertation, University of Colorado. Accessed April 20, 2021.
https://scholar.colorado.edu/phys_gradetds/175.
MLA Handbook (7th Edition):
Xie, Jiayi. “Inferring the Oriented Elastic Tensor from Surface Wave Observations.” 2016. Web. 20 Apr 2021.
Vancouver:
Xie J. Inferring the Oriented Elastic Tensor from Surface Wave Observations. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2021 Apr 20].
Available from: https://scholar.colorado.edu/phys_gradetds/175.
Council of Science Editors:
Xie J. Inferring the Oriented Elastic Tensor from Surface Wave Observations. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/phys_gradetds/175
University of Exeter
29.
Edmunds, James David.
Microwave transmissivity of sub-wavelength metallic structures.
Degree: PhD, 2011, University of Exeter
URL: https://ore.exeter.ac.uk/repository/handle/10036/3214
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547051
► The use of patterned metallic surfaces for the control of the transmission of microwave radiation has been reinvigorated in recent years due to the success…
(more)
▼ The use of patterned metallic surfaces for the control of the transmission of microwave radiation has been reinvigorated in recent years due to the success and interest in metamaterial research. These metallic periodic structures, commonly referred to as frequency selective screens (FSSs), allow responses to be tailored according to the geometry of the metallic structure as opposed to the material composition. A consequence of the presence of a metallic corrugation is the possible excitation of surfaces waves (commonly referred to as surface plasmon polaritons at visible frequencies). Surface waves can be utilised to achieve further control of the transmission properties of a structure. In this thesis several highly original metallic structures are investigated which use FSS and surface wave concepts. These structures exhibit interesting and previously unexplained transmission behaviour. The experimental chapters within this thesis are divided into two areas. The first three experimental chapters (4-6) present original investigations into the excitation of diffractively coupled surface waves on metallic hole/patch arrays and their role in the enhanced transmission/reflection of microwave radiation. The importance of metallic connectivity within arrays is highlighted through measurements of the metallic filling fraction dependence on the transmission properties of regular periodic and random arrays. The last two experimental chapters (7-8) contain investigations into the transmission properties of two novel resonant cavities. The structure studied in chapter 7 provides a mechanism for remarkably enhanced microwave transmission on resonance through an otherwise opaque continuous thin metal film. The second resonant cavity structure in chapter 8 uses a resonant array of metallic crosses to form a ‘resonant mirror’ Fabry-Perot cavity. These resonant FSSs exhibit a frequency dependent transmission/reflection and phase response thus producing an interesting series of modes which have very different properties to those supported by a non-resonant mirror etalon.
Subjects/Keywords: 534; microwave; transmission; metallic; structure; surface waves; diffraction
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APA (6th Edition):
Edmunds, J. D. (2011). Microwave transmissivity of sub-wavelength metallic structures. (Doctoral Dissertation). University of Exeter. Retrieved from https://ore.exeter.ac.uk/repository/handle/10036/3214 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547051
Chicago Manual of Style (16th Edition):
Edmunds, James David. “Microwave transmissivity of sub-wavelength metallic structures.” 2011. Doctoral Dissertation, University of Exeter. Accessed April 20, 2021.
https://ore.exeter.ac.uk/repository/handle/10036/3214 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547051.
MLA Handbook (7th Edition):
Edmunds, James David. “Microwave transmissivity of sub-wavelength metallic structures.” 2011. Web. 20 Apr 2021.
Vancouver:
Edmunds JD. Microwave transmissivity of sub-wavelength metallic structures. [Internet] [Doctoral dissertation]. University of Exeter; 2011. [cited 2021 Apr 20].
Available from: https://ore.exeter.ac.uk/repository/handle/10036/3214 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547051.
Council of Science Editors:
Edmunds JD. Microwave transmissivity of sub-wavelength metallic structures. [Doctoral Dissertation]. University of Exeter; 2011. Available from: https://ore.exeter.ac.uk/repository/handle/10036/3214 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547051
30.
Ritter, Scott.
Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado.
Degree: MS(M.S.), Forest and Rangeland Stewardship, 2016, Colorado State University
URL: http://hdl.handle.net/10217/178922
► Lodgepole pine dwarf mistletoe (Arceuthobium americanum Nutt. ex Engelm) is an obligate hemiparsite that infects lodgepole pine (Pinus contorta Dougl. Ex. Loud) throughout the large…
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▼ Lodgepole pine dwarf mistletoe (Arceuthobium americanum Nutt. ex Engelm) is an obligate hemiparsite that infects lodgepole pine (Pinus contorta Dougl. Ex. Loud) throughout the large majority of lodgepole pine’s range. Lodgepole pine dwarf mistletoe increases mortality rates, alters tree biomass distributions, and slows overall tree growth, which results in substantial losses to stand productivity and wood quality. In lodgepole pine dominated forests, dwarf mistletoe and wildfire are fundamental disturbances that may interact with each other in complex ways. This interaction is bidirectional as wildfire can either positively or negatively affect post-fire dwarf mistletoe populations, and pre-fire dwarf mistletoe populations may influence wildfire severity. Though it has long been assumed that dwarf mistletoe increases potential wildfire severity in lodgepole pine forests through modifications to the fuels complex, empirical data to support this conclusion is lacking. The overall goal of this project was to enhance the understanding of both sides of the fire-dwarf mistletoe interaction through a combination of long-term post-fire data, forest measurements, and simulation of dwarf mistletoe impacts and intensification. Chapter one provides background into dwarf mistletoe biology and pathology, and reviews the existing literature on interactions between fire and dwarf mistletoe. The second chapter documents the results of research into the influence of dwarf mistletoe infestation level on stand
structure and fuel parameters that influence potential fire behavior. To evaluate the relationship between infestation severity and stand
structure and forest fuels plots were randomly located within stands containing a range of dwarf mistletoe infestation severities. Of primary interest were impacts to canopy base height and the loading of fuels both on the forest floor and in the canopy. Chapter three is a case study documenting the impact of three prescribed crown fires on dwarf mistletoe populations thirty years post-fire. These fires burned across a range of mortality levels allowing for a detailed evaluation of the influence of fire severity on dwarf mistletoe populations. This chapter combines field measurements with forest growth and yield simulations from the United States Forest Service’s Forest Vegetation Simulator to understand longer-term impacts to both the dwarf mistletoe population and stand productivity. Field data from randomly located plots indicate that dwarf mistletoe may have conflicting impacts on parameters influencing crown fire potential and wildfire severity. This finding suggests that the impact of dwarf mistletoe infestation of potential wildfire severity may not conform to the positive linear relationship assumed by many forest pathologists. Infestation level was found to have a strong positive relationship with the loading of
surface fuels of all sizes, and was negatively related to canopy base height, and calculated canopy fuel load and canopy bulk density. Impacts to stand
structure include…
Advisors/Committee Members: Hoffman, Chad (advisor), Ex, Seth (committee member), Stewart, Jane (committee member), Zimmerman, Tom (committee member).
Subjects/Keywords: dwarf mistletoe; surface fuel; canopy fuel; woody debris; stand structure
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Ritter, S. (2016). Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/178922
Chicago Manual of Style (16th Edition):
Ritter, Scott. “Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado.” 2016. Masters Thesis, Colorado State University. Accessed April 20, 2021.
http://hdl.handle.net/10217/178922.
MLA Handbook (7th Edition):
Ritter, Scott. “Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado.” 2016. Web. 20 Apr 2021.
Vancouver:
Ritter S. Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Apr 20].
Available from: http://hdl.handle.net/10217/178922.
Council of Science Editors:
Ritter S. Complex interactions between dwarf mistletoe, fuel loading, and fire in the lodgepole pine dominated forests of central Colorado. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/178922
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Open Access Theses and Dissertations
