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Georgia Tech
1.
Liang, Qizhen.
Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/44846
► With excellent electrical, thermal and mechanical properties as well as large specific surface area, graphene has been applied in next-generation nano-electronics, gas sensors, transparent electrical…
(more)
▼ With excellent electrical, thermal and mechanical properties as well as large specific surface area, graphene has been applied in next-generation nano-electronics, gas sensors, transparent electrical conductors, thermally conductive materials, and superior energy capacitors etc. Convenient and productive preparation of graphene is thereby especially important and strongly desired for its manifold applications.
Chemically developed functionalized graphene from graphene oxide (GO) has significantly high productivity and low cost, however, toxic chemical reduction agents (e.g. hydrazine hydrate) and raised temperature (400-1100°C) are usually necessary in GO reduction yet not preferred in current technologies. Here, microwaves (MW) are applied to reduce the amount of graphene oxide (GO) at a relatively low temperature (~165°C). Experimental results indicate that resurgence of interconnected graphene-like domains contributes to a low sheet resistance with a high optical transparency after MW reduction, indicating the very high efficiency of MW in GO's reduction.
Moreover, graphene is usually recumbent on solid substrates, while vertically aligned graphene architecture on solid substrate is rarely available and less studied. For TIMs, electrodes of ultracapacitors, etc, efficient heat dissipation and electrical conductance in normal direction of solid surfaces is strongly desired. In addition, large-volume heat dissipation requires a joint contribution of a large number of graphene sheets. Graphene sheets must be aligned in a large scale array in order to meet the requirements for TIM application. Here, thermally conductive fuctionalized multilayer graphene sheets (fMGs) are efficiently aligned in a large scale by vacuum filtration method at room temperature, as evidenced by SEM images and polarized Raman spectroscopy. A remarkably strong anisotropy in properties of aligned fMGs is observed. Moreover, VA-fMG TIMs are prepared by constructing a three-dimensional vertically aligned functionalized multilayer graphene architecture between contact Silicon/Silicon surfaces with pure Indium as a metallic medium. Compared with their counterpart from recumbent A-fMGs, VA-fMG TIMs have significantly higher equivalent thermal conductivity and lower contact thermal resistance.
Electrical and thermal conductivities of polymer composite are also greatly interested here. Previous researches indicated that filler loading, morphology of fillers, and chemical bonding across filler/polymer interfaces have significant influence on electrical/thermal conductivity of polymer composite. Therefore, the research also pays substantial attention to these issues. First, electrical resistivity of CPCs is highly sensitive on volume or weight ratio (filler loading) of conductive fillers in polymer matrix, especially when filler loading is close to percolation threshold (pc). Thermal oxidation aging usually can cause a significant weight loss of polymer matrix in a CPC system, resulting in a filler loading change which can be exhibited by a prompt…
Advisors/Committee Members: C. P. Wong (Committee Chair), Anselm Griffin (Committee Member), Donggang Yao (Committee Member), Karl Jacob (Committee Member), Meilin Liu (Committee Member).
Subjects/Keywords: Polymer composite; Thermal conductivity; Graphene; Nanomaterials; Electrical conductivity; Graphene; Nanostructured materials
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APA (6th Edition):
Liang, Q. (2011). Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/44846
Chicago Manual of Style (16th Edition):
Liang, Qizhen. “Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials.” 2011. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/44846.
MLA Handbook (7th Edition):
Liang, Qizhen. “Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials.” 2011. Web. 06 Mar 2021.
Vancouver:
Liang Q. Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/44846.
Council of Science Editors:
Liang Q. Preparation and properties of thermally/electrically conductive material architecture based on graphene and other nanomaterials. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/44846
2.
Chae, Han Gi.
Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/28125
► Polyacrylonitrile (PAN)/carbon nanotube (CNT) composite fibers were made using various processing methods such as conventional solution spinning, gel spinning, and bi-component gel spinning. The detailed…
(more)
▼ Polyacrylonitrile (PAN)/carbon nanotube (CNT) composite fibers were made using various processing methods such as conventional solution spinning, gel spinning, and bi-component gel spinning. The detailed characterization exhibited that the smaller and longer CNT will reinforce polymer matrix mostly in tensile strength and modulus, respectively. Gel spinning combined with CNT also showed the promising potential of PAN/CNT composite fiber as precursor fiber of the next generation carbon fiber. High resolution transmission electron microscopy showed the highly ordered PAN crystal layer on the CNT, which attributed to the enhanced physical properties. The subsequent carbonization study revealed that carbonized PAN/CNT fibers have at least 50% higher tensile strength and modulus as compared to those of carbonized PAN fibers. Electrical conductivity of CNT containing carbon fiber was also 50% higher than that of carbonized PAN fiber. In order to have carbon fiber with high tensile strength, the smaller diameter precursor fiber is preferable. Bi-component gel spinning produced 1-2 µm precursor fiber, resulting in ~1 µm carbon fiber. The tensile strength of the carbonized bi-component fiber (islands fibers) is as high as 6 GPa with tensile modulus of ~500 GPa. Further processing optimization may lead to the next generation carbon fiber.
Advisors/Committee Members: Satish Kumar (Committee Chair), Anselm Griffin (Committee Member), Dong Yao (Committee Member), Naresh Thadhani (Committee Member), Samuel Graham (Committee Member).
Subjects/Keywords: Polyacrylonitrile; Carbon nanotube; Bi-component spinning; Gel spinning; Carbon fiber; Polymeric composites; Nanotubes; Carbon fibers; Fibrous composites; Spinning
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APA (6th Edition):
Chae, H. G. (2008). Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/28125
Chicago Manual of Style (16th Edition):
Chae, Han Gi. “Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies.” 2008. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/28125.
MLA Handbook (7th Edition):
Chae, Han Gi. “Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies.” 2008. Web. 06 Mar 2021.
Vancouver:
Chae HG. Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/28125.
Council of Science Editors:
Chae HG. Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/28125
3.
Smith, Michael Hughes.
The design of multifunctional hydrogel nanoparticles for drug delivery.
Degree: PhD, Chemistry and Biochemistry, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/43609
► Hydrogel micro- and nanoparticles (microgels and nanogels) are a promising class of drug delivery vehicles. Composed of hydrophilic polymers arranged into a cross-linked network structure,…
(more)
▼ Hydrogel micro- and nanoparticles (microgels and nanogels) are a promising class of drug delivery vehicles. Composed of hydrophilic polymers arranged into a cross-linked network structure, nanogels show several attractive features for the delivery of macromolecule therapeutics. For instance, the hydrated, porous internal cavity of the nanogel may serve as a high capacity compartment for loading macromolecules, whereas the periphery of the nanogel may be used as a scaffold for conjugating cell-specific targeting moieties. This dissertation presents recent investigations of nanogels as targeted delivery vehicles for oligonucleotides to cancer cells, while exploring new nanogel chemistries that enable future in vivo applications. For instance, synthetic efforts have produced particles capable of erosion into low molar mass constituents, providing a possible mechanism of particle clearance after repeated administration in vivo. In another example, the microgel network chemistry was tuned to promote the encapsulation of charged proteins. In parallel with those synthetic efforts, new light scattering methodologies were developed to accurately quantify the particle behaviors (e.g. loading, erosion). Using multiangle light scattering (MALS), changes in particle molar mass and radius were measured, providing a quantitative and direct approach for monitoring nanogel erosion and macromolecule encapsulation. The new particle chemistries demonstrated, together with enabling light scattering methods, will catalyze the development of improved delivery vehicles in the near future.
Advisors/Committee Members: Professor L. Andrew Lyon (Committee Chair), Professor Anselm Griffin (Committee Member), Professor Facundo Fernandez (Committee Member), Professor Jiri Janata (Committee Member), Professor Robert Dickson (Committee Member).
Subjects/Keywords: Light scattering; SiRNA; RNA interference; Microgel; Drug delivery; Hydrogel particle; Nanogel; Drug delivery systems; Nanogels; Colloids; Nanostructured materials
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APA ·
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APA (6th Edition):
Smith, M. H. (2012). The design of multifunctional hydrogel nanoparticles for drug delivery. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43609
Chicago Manual of Style (16th Edition):
Smith, Michael Hughes. “The design of multifunctional hydrogel nanoparticles for drug delivery.” 2012. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/43609.
MLA Handbook (7th Edition):
Smith, Michael Hughes. “The design of multifunctional hydrogel nanoparticles for drug delivery.” 2012. Web. 06 Mar 2021.
Vancouver:
Smith MH. The design of multifunctional hydrogel nanoparticles for drug delivery. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/43609.
Council of Science Editors:
Smith MH. The design of multifunctional hydrogel nanoparticles for drug delivery. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/43609
4.
Matichak, Jonathan D.
The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications.
Degree: PhD, Chemistry and Biochemistry, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/41050
► Material development is necessary before all-optical signal processing (AOSP) can be realized. Traditional AOSP will require materials with a large magnitude of the real part…
(more)
▼ Material development is necessary before all-optical signal processing (AOSP) can be realized. Traditional AOSP will require materials with a large magnitude of the real part of the third-order polarizability, while having a small imaginary magnitude of third-order polarizability. The aim of this thesis is to investigate the potential for polymethine dyes to be used for AOSP applications. The basic structure of a polymethine dye was synthetically modified in a variety of positions to observe the effects upon the linear and nonlinear optical properties. The modifications included variation in the terminal group, substituents in the polymethine bridge, and exchange of the counterion. The dyes were generally synthesized using the Vilsmeyer-Haack reaction to form simple polymethine precursors, and then complexity was added by performing the Knoevenagel condensation with various acceptors and the polymethine precursor. Ion metathesis was often employed to exchange the initial counterion for a counterion that provided increased solubility in common organic solvents. The third-order nonlinear optical polarizabilities were characterized by Dr. Joel Hales who used the open- and closed-aperture Z-scan technique at 1300 nm and non-degenerate two-photon absorption experiments to identify the position of the two-photon absorption bands.
Advisors/Committee Members: Seth Marder (Committee Chair), Anselm Griffin (Committee Member), Jean-Luc Bredas (Committee Member), Joseph Perry (Committee Member), Laren Tolbert (Committee Member).
Subjects/Keywords: Dioxaborine; Cyanine; Nonlinear optics; TCF; Pyrylium; Polymethines; Telecommunication Materials; Optical communications; Signal processing
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Matichak, J. D. (2010). The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/41050
Chicago Manual of Style (16th Edition):
Matichak, Jonathan D. “The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications.” 2010. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/41050.
MLA Handbook (7th Edition):
Matichak, Jonathan D. “The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications.” 2010. Web. 06 Mar 2021.
Vancouver:
Matichak JD. The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/41050.
Council of Science Editors:
Matichak JD. The design, synthesis, and characterization of polymethine dyes for all-optical signal processing applications. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/41050

Georgia Tech
5.
Englert, Brian Carl.
Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry.
Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech
URL: http://hdl.handle.net/1853/7102
► The synthesis and investigation of new types of poly(paraphenyleneethynylene)s, PPEs, is presented. PPEs which are Jacketed are there by shielded from electronic and plararization effects…
(more)
▼ The synthesis and investigation of new types of poly(paraphenyleneethynylene)s, PPEs, is presented. PPEs which are Jacketed are there by shielded from electronic and plararization effects in the solid state. Other PPEs contain pendent groups which may functionalized before or after polymerization to afford two versitle routes to newly functionalized polymeric materials. Based on the PPE structure, metals may be introduced and these polymers may be used as precursors for other types of materials such as ceramics.
Advisors/Committee Members: Uwe Bunz (Committee Chair), Anselm Griffin (Committee Member), David Collard (Committee Member), Joseph Perry (Committee Member), Laren Tolbert (Committee Member).
Subjects/Keywords: Poly(paraphenyleneethynylene)s
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APA ·
Chicago ·
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Export
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APA (6th Edition):
Englert, B. C. (2005). Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7102
Chicago Manual of Style (16th Edition):
Englert, Brian Carl. “Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry.” 2005. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/7102.
MLA Handbook (7th Edition):
Englert, Brian Carl. “Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry.” 2005. Web. 06 Mar 2021.
Vancouver:
Englert BC. Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/7102.
Council of Science Editors:
Englert BC. Jacketed and Functionalized Poly(paraphenyleneethynylene)s: Nonaggregating Conjugated Polymers and Materials Functionalized Through Click-Chemistry. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7102

Georgia Tech
6.
Singla, Swati.
Topological Effects on Properties of Multicomponent Polymer Systems.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2004, Georgia Tech
URL: http://hdl.handle.net/1853/5067
► Multicomponent polymer systems comprised of two or more chemically different polymer moieties provide an effective way to attain the desired properties from a limited palette…
(more)
▼ Multicomponent polymer systems comprised of two or more chemically different polymer moieties provide an effective way to attain the desired properties from a limited palette of commodity polymers. Variations in macromolecular topologies often result in unique and unusual properties leading to novel applications. This dissertation addresses the effect of topology on properties of two multicomponent polymers systems: blends and polyrotaxanes. Blends of cyclic and linear polymers were compared to their topological counterparts, polyrotaxanes, in which cyclic components are threaded onto the linear polymer chains.
The first part of the dissertation focuses on the synthesis and purification of cyclic polymers derived from linear (polyoxyethylene) (POE). Cyclic POEs of different cycle sizes were synthesized and then purified from their linear byproducts by inclusion complexation with alpha-cyclodextrin. Polystyrene was threaded through the resulting cycles by in situ free radical polymerization of styrene monomer in the presence of an excess of POE cycles. A bulky free radical initiator was utilized to endcap the polystyrene molecule at the two ends to prevent dethreading of cyclic moieties.
In the second part of the dissertation, phase behavior, morphology and dynamics of cyclic POE and polystyrene blends were compared to linear POE and polystyrene blends. Advanced solid-state NMR techniques and differential scanning calorimetry were employed for this purpose. Cyclic POE was found to be much more miscible with polystyrene when compared to linear POE, resulting in nanometer-sized domains and significantly reduced mobilities of the cyclic POE components in the blends. The unusual behavior of cyclic POE in the blends was attributed to topological as well as end-group effects with the topological effects being predominant. Polyrotaxanes composed of polystyrene and cyclic POE components exhibited cyclic POE domain sizes similar to that of physical blends. Cyclic POE dynamics in polyrotaxanes were considerably hindered, however, due to the threaded architecture. Surface segregation studies of cyclic POE/polystyrene blends and polyrotaxanes did not show segregation of POE to the surface because of the improved miscibility and the topological constraints present in these systems.
Advisors/Committee Members: Haskell Beckham (Committee Chair), Anselm Griffin (Committee Member), Johannes Leisen (Committee Member), W. Brent Carter (Committee Member), William J. Koros (Committee Member).
Subjects/Keywords: Topology; Solid-state NMR; Blends; Polyrotaxanes; Polymers; Topology
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Singla, S. (2004). Topological Effects on Properties of Multicomponent Polymer Systems. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/5067
Chicago Manual of Style (16th Edition):
Singla, Swati. “Topological Effects on Properties of Multicomponent Polymer Systems.” 2004. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/5067.
MLA Handbook (7th Edition):
Singla, Swati. “Topological Effects on Properties of Multicomponent Polymer Systems.” 2004. Web. 06 Mar 2021.
Vancouver:
Singla S. Topological Effects on Properties of Multicomponent Polymer Systems. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/5067.
Council of Science Editors:
Singla S. Topological Effects on Properties of Multicomponent Polymer Systems. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/5067

Georgia Tech
7.
Zhou, Jian.
Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2003, Georgia Tech
URL: http://hdl.handle.net/1853/5121
► A liquid crystal (LC) at its boundary surface adopts a preferential alignment, which is referred to as anchoring. The direction of this alignment (i.e., anchoring…
(more)
▼ A liquid crystal (LC) at its boundary surface adopts a preferential alignment, which is referred to as anchoring. The direction of this alignment (i.e., anchoring direction) may be perpendicular, parallel or tilted with respect to the surface. Transitions from one anchoring condition to another may occur when the parameters (e.g., temperature) charactering the surface change, as referred to as anchoring transitions. In the LC-polymer composite systems under our study, the anchoring and temperature- driven anchoring transitions of nematic fluids is very sensitive to the structure of the side chain of poly (alkyl acrylate) matrixes that encapsulate the LC. We have shown that the anchoring transition temperature of these systems can be tuned far below the nematic-to-isotropic transition temperature, by varying either the length, branching structure of the side chains of homopolymers, or the composition of copolymer of two dissimilar monomers. Both sharp and broad anchoring transitions with respect to the temperature range over which a transition occurs were observed. It is postulated that microscopic interactions between the polymer side chains and LC molecules play an important role in determining the anchoring. In particular, the conformation of the polymer side chain is proposed to have important control over the anchoring. Anchoring strength and tilt angle as a function of temperature during the anchoring transitions were also experimentally investigated, which contribute to understanding of the microscopic mechanism for such transitions.
Based on the LC-polymer composites with controlled anchoring, a LC display with reverse switching mode and a novel electrically switchable diffraction grating have been demonstrated. The advantages of these devices are ease of manufacturing, low operation voltage, and mechanical stability offered by polymer matrix.
Moreover, a detailed study of the director configuration of wall defects found in these composite films was carried out using fluorescence confocal polarized microscopy.
Advisors/Committee Members: Mohan Srinivasarao (Committee Chair), David M. Collard (Committee Co-Chair), Andrew Lyon (Committee Member), Anselm Griffin (Committee Member), Jung O. Park (Committee Member), Mostafa El-Sayed (Committee Member).
Subjects/Keywords: Anchoring; Liquid crystals; Polymers; Nematic; Surface; Composites; Polymer liquid crystals Surfaces; Polymeric composites Surfaces
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Zhou, J. (2003). Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/5121
Chicago Manual of Style (16th Edition):
Zhou, Jian. “Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals.” 2003. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/5121.
MLA Handbook (7th Edition):
Zhou, Jian. “Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals.” 2003. Web. 06 Mar 2021.
Vancouver:
Zhou J. Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals. [Internet] [Doctoral dissertation]. Georgia Tech; 2003. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/5121.
Council of Science Editors:
Zhou J. Study of Anchoring Behavior of Nematic Fluids at The Interface of Polymer-Dispersed Liquid Crystals. [Doctoral Dissertation]. Georgia Tech; 2003. Available from: http://hdl.handle.net/1853/5121

Georgia Tech
8.
Wang, Tong.
Electrospun carbon nanofibers for electrochemical capacitor electrodes.
Degree: PhD, Textile and Fiber Engineering, 2007, Georgia Tech
URL: http://hdl.handle.net/1853/22563
► The objective of this work is to electrospin poly(acrylonitrile) (PAN) based nanofibers with controlled diameter and to stabilize and carbonize them for developing meso-porous carbon…
(more)
▼ The objective of this work is to electrospin poly(acrylonitrile) (PAN) based nanofibers with controlled diameter and to stabilize and carbonize them for developing meso-porous carbon for application as electrochemical capacitor electrodes. A sacrificial polymer, poly(styrene-co-acrylonitrile) (SAN) has been used to control porosity. Carbon nanotubes (CNT) have been used to increase electrode conductivity and hence power density. The study has been divided into two parts.
In part I, electrospinning behavior of PAN and PAN/CNT has been studied. The diameter of electrospun PAN fibers was monitored as a function of polymer molecular weight, solution concentration, solution flow rate, distance between the spinneret and the target, and the applied voltage. Bead free PAN fibers of 60 nm diameter have been electrospun. Various electrospun fibers have been characterized by wide angle X-ray diffraction and by Raman spectroscopy. Electrospinning process has been observed by high speed photography.
In part II, the electrospun PAN, PAN/SAN, and PAN/SAN/CNT fiber mats were stabilized, carbonized, and processed into electrochemical capacitor electrodes. The performance of the electrochemical capacitors was tested by the constant current charge/discharge and cyclic voltammetry in 6 molar potassium hydroxide aqueous solution. The surface area and pore size distribution of the electrodes were measured using N2 adsorption and desorption. The effect of surface area and pore size distribution on the capacitance performance has been studied. The capacitance performance of various carbonized electrospun fibers mats have been compared to those of the PAN/SAN/CNT film, carbon nanotube bucky paper, and activated carbon pellet. The capacitance of PAN/SAN/CNT fiber mat over 200 F/g (at a current density of 1 A/g) and the power density approaching 1 kW/kg have been observed. Addition of 1 wt% carbon nanotubes in PAN/SAN, improves the power density by a factor of four. For comparison, the capacitance of single wall carbon nanotube bucky paper at a current density of 1 A/g is about 50 F/g.
Advisors/Committee Members: Satish Kumar (Committee Chair), Anselm Griffin (Committee Member), John D. Muzzy (Committee Member), Ravi Bellamkonda (Committee Member), Rina Tannenbaum (Committee Member).
Subjects/Keywords: Carbon nanofibers; Electrospin; Electrochemical capacitor; Nanofibers; Carbon fibers; Electrochemistry; Electrodes; Capacitors
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Wang, T. (2007). Electrospun carbon nanofibers for electrochemical capacitor electrodes. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/22563
Chicago Manual of Style (16th Edition):
Wang, Tong. “Electrospun carbon nanofibers for electrochemical capacitor electrodes.” 2007. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/22563.
MLA Handbook (7th Edition):
Wang, Tong. “Electrospun carbon nanofibers for electrochemical capacitor electrodes.” 2007. Web. 06 Mar 2021.
Vancouver:
Wang T. Electrospun carbon nanofibers for electrochemical capacitor electrodes. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/22563.
Council of Science Editors:
Wang T. Electrospun carbon nanofibers for electrochemical capacitor electrodes. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/22563

Georgia Tech
9.
Foston, Marcus Bernard.
Cyclic, tethered and nanoparticulate silicones for material modification.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/24762
► I have examined three different topological forms of a material modifier. The modifier is silicone and the three topological forms are cyclic, linear tethers and…
(more)
▼ I have examined three different topological forms of a material modifier. The modifier is silicone and the three topological forms are cyclic, linear tethers and networked siloxane bonds in the form of a nanoparticulate. Often silicones, or siloxanes, are added to a material because of its unique properties that are related to its inorganic or inorganic-organic hybrid character.
This dissertation addresses either the synthesis of silicones for material modification or the effect of the adding silicones to a variety of substrates and polymeric systems.
Chapters 2 and 3 present research focused on the first topological form, cyclic PDMS. The synthesis of cyclic polymers is very important to the synthesis and subsequent characterization of cyclic containing multi-component materials. Cyclic PDMS is formed via ring-chain depolymerization and bimolecular coupling and the unique issues associated with the formation, purification and analysis of cyclic polymer topologies. The goal of the work described in these chapters was to find a straightforward high-yield route to form large cycles of PDMS in a relatively high purity.
Chapter 4 focuses on the modification of the next topological form, linear polymers as tethers for surface modification and presents a novel concept for surface-modifying compounds; the incorporation of an ionic-reactive functionality into PDMS is presented. The idea being its ionic character will increase affinity for the surface, surface coverage and levelness, while the subsequent reactive fixation will permanently modify the surface to improve retention and fastness. The use of such chemistry has not been applied for surface modification protocols.
Chapters 5, 6 and 7 discuss the characterization of systems with the third topological form incorporated. They include differences in the viscoelastic behavior of PVAc/silica nanocomposites and the neat PVAc matrix, relating those differences to polymer dynamics and structure as determined by several solid-state NMR experiments. The latter two chapters pertain to PVAc/silica nanocomposites with PDMS surface treatments. Specifically, evaluating how polymer dynamics and structure changes particularly at the interfaceinterphase with various PDMS surface treatments having different topologies at the surface.
Advisors/Committee Members: Dr. Haskell W. Beckham (Committee Chair), Dr. Anselm Griffin (Committee Member), Dr. Johannes Leisen (Committee Member), Dr. Sankar Nair (Committee Member), Dr. Uwe Bunz (Committee Member).
Subjects/Keywords: Cyclic PDMS; Ionic-reactive; Surface-modifying compounds; PVAc/silica nanocomposites; Solid-state NMR; Silicones Synthesis; Nanostructured materials; Composite materials; Polymeric composites
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APA (6th Edition):
Foston, M. B. (2008). Cyclic, tethered and nanoparticulate silicones for material modification. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/24762
Chicago Manual of Style (16th Edition):
Foston, Marcus Bernard. “Cyclic, tethered and nanoparticulate silicones for material modification.” 2008. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/24762.
MLA Handbook (7th Edition):
Foston, Marcus Bernard. “Cyclic, tethered and nanoparticulate silicones for material modification.” 2008. Web. 06 Mar 2021.
Vancouver:
Foston MB. Cyclic, tethered and nanoparticulate silicones for material modification. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/24762.
Council of Science Editors:
Foston MB. Cyclic, tethered and nanoparticulate silicones for material modification. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/24762

Georgia Tech
10.
Zucchero, Anthony Joseph.
Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals.
Degree: PhD, Chemistry and Biochemistry, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/37206
► The design of chromophores targets materials with optoelectronic properties necessary for advanced applications. Organic materials possess properties which emerge from the collective impact of the…
(more)
▼ The design of chromophores targets materials with optoelectronic properties necessary for advanced applications. Organic materials possess properties which emerge from the collective impact of the constituent backbone and substituents as well as their connectivity (i.e. molecular architecture), necessitating the exploration of novel conjugated architectures. This thesis chronicles our examination of 1,4-distyryl-2,5-bis(arylethynyl)benzenes (cruciforms, XFs). Electronic substitution of this 'X-shaped' cross-conjugated scaffold tunes both the energy levels and the spatial distribution of the frontier molecular orbitals (FMOs) in XFs. The resulting fluorophores exhibit FMO separation, imbuing XFs with desirable properties for sensory applications. Using model analytes, we examine how the underlying FMO arrangement and the nature of analyte interaction elicit observable responses. These studies provide a foundation for future access of functional responsive ratiometric cores. This case study demonstrates the importance and unique potential of FMO-separated fluorophores.
Advisors/Committee Members: Uwe H. F. Bunz (Committee Chair), Anselm Griffin (Committee Member), David M. Collard (Committee Member), Joseph Perry (Committee Member), Laren M. Tolbert (Committee Member).
Subjects/Keywords: Conjugated materials; Fluorophores; FMO separation; Sensors; Cruciforms; Organic electronics; Fluorescent probes
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zucchero, A. J. (2010). Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/37206
Chicago Manual of Style (16th Edition):
Zucchero, Anthony Joseph. “Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals.” 2010. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/37206.
MLA Handbook (7th Edition):
Zucchero, Anthony Joseph. “Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals.” 2010. Web. 06 Mar 2021.
Vancouver:
Zucchero AJ. Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/37206.
Council of Science Editors:
Zucchero AJ. Cruciform pi-systems: novel two-dimensional cross-conjugated chromophores possessing spatially separated frontier molecular orbitals. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/37206

Georgia Tech
11.
Zhang, Xiefei.
Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers.
Degree: PhD, Textile and fiber engineering, 2004, Georgia Tech
URL: http://hdl.handle.net/1853/7610
► Single wall carbon nanotubes (SWNT) have been extensively studied over the last decade due to their excellent comprehensive properties for a variety of applications. This…
(more)
▼ Single wall carbon nanotubes (SWNT) have been extensively studied over the last decade due to their excellent comprehensive properties for a variety of applications. This study is focused on the applications of SWNTs as reinforcement for polymer matrices. Due to van der Waal interactions, SWNTs form bundles of about 30 nm diameters. In order to take full advantage of the SWNT mechanical properties, SWNT must exfoliate or at least disperse in small diameter bundle size. Optical microscopy and SEM only give qualitative information of dispersion. Quantitative characterization through TEM or AFM can be time consuming in order to get statistical result. In this study, simple method is developed to quantitatively estimate the size of SWNT bundle in dispersion based on the geometry controlled electrical percolation behavior. The SWNTs can be dispersed /exfoliated via PVP wrapped SWNT aqueous dispersion assisted by surfactants such as sodium dodycel sulfate. PVA / SWNT composite films prepared through PVP wrapped SWNTs exhibit improved mechanical properties as well as the evidence of load transfer from the polymer matrix to the SWNT as monitored by the Raman spectroscopy. SWNT can also be well dispersed into PVA/DMSO/H2O solution. Gel spinning of PVA/SWNT composite fiber has been successfully carried out with improved mechanical properties. Functionalized tubes can be used to enhance SWNT dispersion and exfoliation. Oxidation in strong acids is one method used for functionalizing nanotubes. SWNTs have been functionalized in nitric acid. The structure and properties of films (buckypaper) processed from nitric acid functionalized tubes have been studied exhibiting high tensile strength and high electrical conductivity. Nitric acid treatment results in selective degradation of the small diameter tubes.
Advisors/Committee Members: Satish Kumar (Committee Chair), Anselm Griffin (Committee Member), David Collard (Committee Member), Hamid Garmestani (Committee Member), Pete Ludovice (Committee Member), Samuel Graham (Committee Member).
Subjects/Keywords: SWNT; Polymers; Composite; Film; Fiber; Nanostructured materials; Polymeric composites
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, X. (2004). Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7610
Chicago Manual of Style (16th Edition):
Zhang, Xiefei. “Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers.” 2004. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/7610.
MLA Handbook (7th Edition):
Zhang, Xiefei. “Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers.” 2004. Web. 06 Mar 2021.
Vancouver:
Zhang X. Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/7610.
Council of Science Editors:
Zhang X. Studies on Single Wall Carbon Nanotube and Polymer Composite Films and Fibers. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/7610

Georgia Tech
12.
Shotwell, Sandra Leigh.
Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.
Degree: PhD, Chemistry and Biochemistry, 2006, Georgia Tech
URL: http://hdl.handle.net/1853/10449
► In the first part of this thesis, the synthesis, characterization and investigation of ortho-phenyleneethynylenes containing heterocycles, are presented. These compounds display changes in absorption and…
(more)
▼ In the first part of this thesis, the synthesis, characterization and investigation of ortho-phenyleneethynylenes containing heterocycles, are presented. These compounds display changes in absorption and emission spectra varying with their functionalization and size. These compounds also have the ability to coordinate with metals. The synthesis of coordination compounds and their crystallographic data are reported. The synthesis and characterization of tetraethynyl thiophene compounds containing pyridines are also presented. These compounds exhibit differences in absorption and emission spectra upon exposure to various metal salts. The final topic to be discussed is the synthesis and characterization of diphenyl amine polymers. These polymers could in principle be used in NLO applications or light emitting devices.
Advisors/Committee Members: Dr. Uwe Bunz (Committee Chair), Dr. Anselm Griffin (Committee Member), Dr. David Collard (Committee Member), Dr. Joseph Perry (Committee Member), Dr. Laren Tolbert (Committee Member).
Subjects/Keywords: Polymers; Thiophenes Synthesis; Pyridinium compounds Synthesis; Ligands; Diphenylamine Synthesis; Oligomers
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Shotwell, S. L. (2006). Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/10449
Chicago Manual of Style (16th Edition):
Shotwell, Sandra Leigh. “Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.” 2006. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/10449.
MLA Handbook (7th Edition):
Shotwell, Sandra Leigh. “Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers.” 2006. Web. 06 Mar 2021.
Vancouver:
Shotwell SL. Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/10449.
Council of Science Editors:
Shotwell SL. Synthesis and Characterization of ortho-Phenyleneethynylenes and Diphenylamine Polymers. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/10449

Georgia Tech
13.
Wang, Xi.
Drop-on-demand inkjet deposition of complex fluid on textiles.
Degree: PhD, Polymer, Textile and Fiber Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/26624
► The objective of the research was to develop fundamental understanding of the process of deposition of complex mixtures by the inkjet method. The rheological properties…
(more)
▼ The objective of the research was to develop fundamental understanding of the process of deposition of complex mixtures by the inkjet method. The rheological properties and DOD drop formation dynamics of carbon black pigmented inkjet inks were investigated. It was found that the suspension microstructure responses to bulk motions, leading to shear rate and time dependent shear viscosity. However, DOD drop formation dynamics of highly pigmented inkjet ink and pure Newtonian fluid is similar even though shear rate up to 105 s-1 exists during inkjet jetting process. A proposed explanation for these observations is that the shearing time during DOD drop ejection is insufficient for changing and stabilizing the microstructure of the suspension. The effects of signal amplitude and jetting frequency on DOD drop formation dynamics of pure Newtonian fluids were investigated. A transition of DOD drop formation dynamics when the inkjet nozzle is switched from idle to jetting was identified. A qualitative investigation of DOD drop impaction and post-impaction behavior on inkjet paper and textiles was carried out. Dynamics of DOD drop accumulation and spreading on the substrates and final ink distribution show drastic differences between these two substrates.
Advisors/Committee Members: Wallace W. Carr (Committee Chair), Anselm Griffin (Committee Member), Carson J. Meredith (Committee Member), David G. Bucknall (Committee Member), Jeffrey F. Morris (Committee Member).
Subjects/Keywords: Capillary viscometer; Drop-on-demand; Drop formation; Inkjet printing; Textile printing; Inkjet ink; Suspension rheology; Ink-jet printing; Drops
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, X. (2008). Drop-on-demand inkjet deposition of complex fluid on textiles. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/26624
Chicago Manual of Style (16th Edition):
Wang, Xi. “Drop-on-demand inkjet deposition of complex fluid on textiles.” 2008. Doctoral Dissertation, Georgia Tech. Accessed March 06, 2021.
http://hdl.handle.net/1853/26624.
MLA Handbook (7th Edition):
Wang, Xi. “Drop-on-demand inkjet deposition of complex fluid on textiles.” 2008. Web. 06 Mar 2021.
Vancouver:
Wang X. Drop-on-demand inkjet deposition of complex fluid on textiles. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1853/26624.
Council of Science Editors:
Wang X. Drop-on-demand inkjet deposition of complex fluid on textiles. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/26624
.