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- Description:
- The microwave, optical, and electro-optic properties of epitaxial barium titanate thin films grown on (100) MgO substrates and photonic crystal electro-optic modulators fabricated on these films were investigated to demonstrate the applicability of these devices for telecommunication and data networks. The electrical and electro-optical properties were characterized up to modulation...
- Keyword:
- Integrated Photonics, Photonic Crystal, Ferroelectric, and Modulator
- Subject:
- Materials Science and Engineering
- Creator:
- Peter Girouard
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/13/2018
- Date Modified:
- 02/13/2018
- Date Created:
- 2016-01-01
- Resource Type:
- Dissertation
-
- Description:
- Worldwide, governments are beginning to take action to reduce anthropogenic CO2 emissions in order to mitigate the extent of global climate change. The largest fraction of global CO2 emission comes from electrical power generation, which is rapidly being converted to wind and solar installations. The intermittent nature of renewable resources...
- Keyword:
- SOC, Electrolysis, Fuel Cells, SOFC, SOEC, and Energy Storage
- Subject:
- Materials Science and Engineering
- Creator:
- Justin Railsback
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/19/2018
- Date Modified:
- 02/19/2018
- Date Created:
- 2016-01-01
- Resource Type:
- Dissertation
-
- Description:
- Organic photovoltaic (OPV) solar cells aim to provide efficient, flexible and lightweight photovoltaics (PV) with simple processing and low-cost. Advances in device optimization, structural and molecular design, as well as mechanistic understanding have helped increase device efficiency and performance. Within the framework of active layer optimization, systematically improving bulk heterojunction...
- Keyword:
- Self-assembly, solar cell, Organic photovoltaic, morphology, bulk heterojunction, and hydrogen bonding
- Subject:
- Materials Science and Engineering
- Creator:
- Taner Aytun
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/19/2018
- Date Modified:
- 02/19/2018
- Date Created:
- 2016-01-01
- Resource Type:
- Dissertation
-
- Description:
- Growing energy and climate concerns in the United States and across the world demand improvements in energy efficiency, conservation, and renewability. Solid oxide fuel cells (SOFCs) are highly efficient devices that electrochemically convert the chemical energy of a fuel to electricity. These devices can operate on natural gas as a...
- Keyword:
- Electrochemistry
- Subject:
- Materials Science and Engineering
- Creator:
- Patrick Kevin Duffy
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/20/2018
- Date Modified:
- 02/20/2018
- Date Created:
- 2016-01-01
- Resource Type:
- Dissertation
-
- Description:
- Nano-structured mixed ionic and electronic conducting (MIEC) materials have garnered intense interest in electrode development for solid oxide fuel cells due to their high surface areas which allow for effective catalytic activity and low polarization resistances. In particular, composite solid oxide fuel cell (SOFC) cathodes consisting of ionic conducting scaffolds...
- Keyword:
- Nanoparticles, Electrochemistry, Degradation, Cathodes, Infiltration, and SOFC
- Subject:
- Materials Science and Engineering
- Creator:
- Ann Virginia Call
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 03/13/2018
- Date Modified:
- 03/13/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- The impacts of many important technologies are limited by the availability of better-performing materials. One factor limiting the ability of engineers to develop better materials is the speed at which they can search through possible formulations and processing schemes. Recently, machine learning algorithms have emerged as a possible route to...
- Keyword:
- Machine Learning, Density Functional Theory, Crystal Structure Solution, Metallic Glasses, and Materials Science
- Subject:
- Materials Science and Engineering
- Creator:
- Logan Timothy Ward
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 03/13/2018
- Date Modified:
- 03/13/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Metal and bimetallic nanoparticles are of interest and are widely used in various applications because of their unique optical, electronic, and catalytic properties, which differ from those of their bulk counterparts. Better understanding of the thermodynamic and kinetic properties of nanoparticles and their underlying growth mechanisms can serve as a...
- Keyword:
- Nanotechnology, Electron Microscopy, and Materials Chemistry
- Subject:
- Materials Science and Engineering
- Creator:
- Lingxuan Peng
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 03/28/2018
- Date Modified:
- 03/28/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Accurate thermodynamic databases are the foundation of predictive microstructure and property models. An initial assessment of the commercially available Thermo-Calc TCAL2 database and the proprietary aluminum database of QuesTek demonstrated a large degree of deviation with respect to equilibrium precipitate phase prediction in the compositional region of interest when compared...
- Keyword:
- Atom-probe tomography (APT), Q-phase precipitates, CALPHAD, and Aluminum alloys
- Subject:
- Materials Science and Engineering
- Creator:
- Andrew Clay Bobel
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 04/02/2018
- Date Modified:
- 04/02/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- In today's rapidly changing world, there is constant demand for the development of new, high performance materials. Fire resistant steels can provide greater safety in the event of a building fire, creep resistant stainless steels can allow for higher power plant efficiency, and cobalt based superalloys have potential for use...
- Keyword:
- Stainless Steel, Fire Resistance, Combinatorial Synthesis, CALPHAD, Atom Probe Tomography, and Ferritic Steels
- Subject:
- Materials Science and Engineering
- Creator:
- Cameron Thomas Gross
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 04/18/2018
- Date Modified:
- 04/18/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Graphene offers promising opportunities for applications in printed and flexible electronic devices due to its high electrical and thermal conductivity, mechanical flexibility and strength, and chemical and environmental stability. However, scalable production and processing of graphene presents a critical technological challenge preventing the application of graphene for flexible electronic interconnects,...
- Keyword:
- conductive inks, inkjet printing, printed electronics, carbon nanomaterials,, and graphene
- Subject:
- Materials Science and Engineering
- Creator:
- Ethan Benjamin Secor
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 04/30/2018
- Date Modified:
- 04/30/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- The transport properties of mayenite-based materials, Ca12Al14O33, were investigated. Systems studied included H-doped/ UV-irradiated Ca12Al14O33, Ca(12-x)MgxAl14O33 (x = 0.1, 0.3, 0.5, 0.8, 1) and Ca12Al(14-x)SixO(33+x/2) (x = 1, 2, 3, 4). The as-prepared Ca12Al14O33 exhibited a room temperature electronic conductivity on the order of 10^-10 S/cm, and a high temperature...
- Keyword:
- Chemistry
- Subject:
- Materials Science and Engineering
- Creator:
- Mariana Ines Bertoni
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/10/2018
- Date Modified:
- 05/10/2018
- Date Created:
- 2007-01-30
- Resource Type:
- Dissertation
-
- Description:
- The electronic transport and magnetoresistive properties of the ferromagnetic semiconductor In1-xMnxAs were investigated in order to determine the nature of the transport and ferromagnetism in the films. p-InMnAs/n-InAs and metal/oxide/InMnAs heterojunctions were fabricated and characterized to elucidate the transport and magnetoresistance mechanisms at these technologically important interfaces. The electronic transport...
- Keyword:
- p-n junctions, magnetic semiconductors, and InMnAs
- Subject:
- Materials Science and Engineering
- Creator:
- Steven J. May
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/14/2018
- Date Modified:
- 05/14/2018
- Date Created:
- 2007-02-19
- Resource Type:
- Dissertation
-
- Description:
- Biomorphic silicon carbide (bioSiC) is a novel porous ceramic material derived directly from wood precursors. This material is fabricated by pyrolysis of a natural wood precursor in an inert atmosphere leaving an amorphous carbon scaffold. The amorphous carbon is infiltrated with molten Si in vacuum at elevated temperature, which reacts...
- Keyword:
- Engineers and Material Sciences
- Subject:
- Materials Science and Engineering
- Creator:
- Vikram Sharad Kaul
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/14/2018
- Date Modified:
- 05/14/2018
- Date Created:
- 2007-02-20
- Resource Type:
- Dissertation
-
- Description:
- Solid oxide fuel cells (SOFCs), renowned for their high electrical generation efficiency with low pollutant production, are promising for reducing global energy and environmental concerns. However, there are major barriers for SOFC commercialization. A primary challenge is reducing the capital cost of SOFC power plants to levels that can compete...
- Keyword:
- co-generation, LSGM, Cathode, syngas, direct methane, and SOFC
- Subject:
- Materials Science and Engineering
- Creator:
- Yuanbo Lin
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/14/2018
- Date Modified:
- 05/14/2018
- Date Created:
- 2007-03-09
- Resource Type:
- Dissertation
-
- Description:
- Fundamental investigations on the origins of friction at the nanoscale were carried out using both theoretical and experimental approaches. A model was developed that analytically solves for friction by the motion of dislocations at atomically flat crystalline interfaces. It combines known concepts from dislocation drag, grain boundary theory, and contact...
- Keyword:
- dislocations, tribology, friction, and in-situ TEM
- Subject:
- Materials Science and Engineering
- Creator:
- Arno Peter Merkle
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/21/2018
- Date Modified:
- 05/21/2018
- Date Created:
- 2007-03-15
- Resource Type:
- Dissertation
-
- Description:
- The optical and magneto-optical properties of the ferromagnetic semiconductors, InMnAs and its alloy InMnAsP were investigated to determine the band structure and nature of the ferromagnetism in these materials. Alloys were grown by metal-organic vapor phase epitaxy. Infrared absorption of InMnAs was investigated to determine the presence and properties of...
- Keyword:
- Engineering and Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Phillip Tang Chiu
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/22/2018
- Date Modified:
- 05/22/2018
- Date Created:
- 2007-04-18
- Resource Type:
- Dissertation
-
- Description:
- Ceramic matrix composites are known for their low density, high strength and high stiffness, but lower fracture toughness compared to metal matrix composites. The addition of a reinforcing agent within the matrix can increase the toughness of the composite via many strain energy absorption mechanisms such as plastic deformation. This...
- Keyword:
- Engineering and Materials Science
- Subject:
- Materials Science and Engineering
- Creator:
- Nasim Alem
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 05/22/2018
- Date Modified:
- 05/22/2018
- Date Created:
- 2007-04-25
- Resource Type:
- Dissertation
-
- Description:
- Supramolecular chemistry has proven to be an effective strategy for bottom-up fabrication of monodisperse, functional nanostructures. However, most applications require these nanostructures to be spatially or orientationally ordered. This thesis investigates patterning and spatial confinement as tools for controlling order in self-assembling systems. We first look to improve the ordering...
- Keyword:
- Alignment, Order, Self-Assembly, and Lithography
- Subject:
- Materials Science and Engineering
- Creator:
- Albert M Hung
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 06/27/2018
- Date Modified:
- 06/27/2018
- Date Created:
- 2007-05-11
- Resource Type:
- Dissertation
-
- Description:
- Polymers and polyelectrolytes are ideal tools for the development of novel self-assembled materials. The ability to control the length-scales of self-assembly, and thus the properties, for soft materials lies in the understanding and subsequent manipulation of competing intermolecular interactions, such as hydrophobicity, hydrogen bonding, van der Waals, electrostatics. In this...
- Keyword:
- Monte Carlo, charged systems, polymer gel, molecular dynamics, and Random Phase Approximation
- Subject:
- Materials Science and Engineering
- Creator:
- Sharon Loverde
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 07/25/2018
- Date Modified:
- 07/25/2018
- Date Created:
- 2007-05-14
- Resource Type:
- Dissertation
-
- Description:
- Novel self-healing alloy composites have been designed to address the need for self-repairable high-strength structural materials. A systems-based materials design approach using computational design tools was used to design a multifunctional biomimetic composite that can repair structural damage. The self-healing composite consists of a controlled-melting alloy matrix reinforced by thermodynamically...
- Keyword:
- Magnesium, Self-Healing, Shape Memory Alloy, Biomimetic, Composite, and Materials Design
- Subject:
- Materials Science and Engineering
- Creator:
- Michele Manuel
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 07/25/2018
- Date Modified:
- 07/25/2018
- Date Created:
- 2007-05-31
- Resource Type:
- Dissertation
-
- Description:
- In high power density transmission systems, Ni-Co secondary hardening steels have shown great potential for next-generation gear applications due to their excellent strength, toughness and superior fatigue performance. Study of residual stress generation and evolution in Ferrium C61 and C67 gear steels revealed that shot peening and laser peening processes...
- Keyword:
- secondary hardening, residual stress, synchrotron radiation, computational design, ultra-hard gear steels, and cryogenic deformation
- Subject:
- Materials Science and Engineering
- Creator:
- Yana Qian
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 07/26/2018
- Date Modified:
- 07/26/2018
- Date Created:
- 2007-05-10
- Resource Type:
- Dissertation
-
- Description:
- Over the past two decades photonic crystals (PhCs) have emerged as a promising new class of materials which offers unprecedented control of light in materials. Recently, atomic layer deposition (ALD) has been shown to be a powerful tool for the infiltration of 3D templates with dielectric or semiconducting materials, which...
- Keyword:
- opals, ZnO, photonic crystals, emission, photonic band gap, and lasing
- Subject:
- Materials Science and Engineering
- Creator:
- Michael Georg Scharrer
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 07/30/2018
- Date Modified:
- 07/30/2018
- Date Created:
- 2007-05-09
- Resource Type:
- Dissertation
-
- Description:
- Oxide surface structures play a key role in many technological processes, including catalysis, thin film growth, and layered structures, and a thorough understanding of surface structures and surface structure dynamics is required in order to better engineer materials systems for these processes. This research works towards understanding these fundamental principles...
- Keyword:
- Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Courtney Lanier
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/01/2018
- Date Modified:
- 08/01/2018
- Date Created:
- 2007-08-17
- Resource Type:
- Dissertation
-
- Description:
- In this work, the processing of the superconductor MgB<sub>2</sub> was studied to create a fundamental scientific background for the production of superconducting composite wires. The synthesis of MgB<sub>2</sub> from Mg and B powders was investigated in situ to determine reaction rates and kinetic parameters for the application of powder-in-tube technology...
- Keyword:
- Engineering and Materials Science
- Subject:
- Materials Science and Engineering
- Creator:
- John Defouw
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/02/2018
- Date Modified:
- 08/02/2018
- Date Created:
- 2007-06-26
- Resource Type:
- Dissertation
-
- Description:
- Gradient copolymers are novel materials that possess a gradual variation in composition along the chain, thereby forming an intermediate structure between random and block copolymers. As such, they are a model system to investigate the effect of molecular structure on fundamental properties of copolymers and may be useful in many...
- Keyword:
- spinodal decomposition
- Subject:
- Materials Science and Engineering
- Creator:
- Yongwoo Kwon
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/06/2018
- Date Modified:
- 08/06/2018
- Date Created:
- 2007-07-09
- Resource Type:
- Dissertation
-
- Description:
- Because soft materials, particularly polymer gels, are playing a greater role in industrial and biotechnological applications today, the exploration of their mechanical behavior over a range of deformations is becoming more relevant in our daily lives. Understanding these properties is therefore necessary as a means to predict their response for...
- Keyword:
- contact mechanics, mechanical properties, polymer gels, silicone, indentation, and poly(N-isopropyl acrylamide)
- Subject:
- Materials Science and Engineering
- Creator:
- Wei-Chun Lin
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/07/2018
- Date Modified:
- 08/07/2018
- Date Created:
- 2007-08-28
- Resource Type:
- Dissertation
-
- Description:
- In this dissertation, the Tg behavior of nanoconfined polymer films and 1-dimensional (1-D) patterned polymer nanostructures was studied. Using a novel fluorescence method, a reduction in Tg was observed upon confinement in PS films supported on silica, where free-surface (polymer-air interface) effects are dominant in modifying Tg. In contrast, Tg...
- Keyword:
- Materials Science and Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Manish Kumar Mundra
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/13/2018
- Date Modified:
- 08/13/2018
- Date Created:
- 2007-08-13
- Resource Type:
- Dissertation
-
- Description:
- This thesis examines the effects of micro-alloying additions to Al-Sc alloys on the microstructure, coarsening resistance and creep properties. The overarching goal of this research is to develop castable, creep-resistant aluminum alloys which can be used at temperatures in excess of 300?C. Successful high-temperature application of aluminum based alloys offers...
- Keyword:
- Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Marsha Van Dalen
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/16/2018
- Date Modified:
- 08/16/2018
- Date Created:
- 2007-10-05
- Resource Type:
- Dissertation
-
- Description:
- A series of investigations was undertaken to explore the processing and properties of porous titanium with 6 wt% Al and 4 wt% vanadium (Ti-6Al-4V) and an equiatomic nickel-titanium alloy (NiTi). In this study, porous materials were created in the solid state by entrapping argon in a powder compact, and subsequently...
- Keyword:
- NiTi, creep, Foam, and metal
- Subject:
- Materials Science and Engineering
- Creator:
- Scott M. Oppenheimer
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/27/2018
- Date Modified:
- 08/27/2018
- Date Created:
- 2007-11-19
- Resource Type:
- Dissertation
-
- Description:
- Aluminum alloys strengthened with coherent (L1<sub>2</sub>), nanosize Al<sub>3</sub>Sc precipitates may be used as structural materials at elevated temperatures. They are creep resistant at 300°C and exhibit a threshold stress, below which creep is not measurable. Introducing ternary alloying additions, such as rare-earth elements (RE=Y, Dy, Er), that segregate within Al<sub>3</sub>Sc...
- Keyword:
- precipitate coarsening, rare-earth elements, mechanical properties, creep, aluminum-scandium alloys, and precipitation strengthening
- Subject:
- Materials Science and Engineering
- Creator:
- Richard Karnesky
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/27/2018
- Date Modified:
- 08/27/2018
- Date Created:
- 2007-10-24
- Resource Type:
- Dissertation
-
- Description:
- Dimensionally constrained material systems are at the forefront of current materials research because of their novel and often enhanced physical, chemical and biological properties. The dimensionality effects are pervasive through different classes of materials including ceramics, metals and polymers. Often times dimensionality effects are manifested as internal structure variations in...
- Keyword:
- Engineering and Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Suresh Kumar Donthu
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/27/2018
- Date Modified:
- 08/27/2018
- Date Created:
- 2007-12-06
- Resource Type:
- Dissertation
-
- Description:
- For bone regeneration, there is need for biodegradable, synthetic scaffolds that direct the formation of <em>de novo</em> mineralized tissue. Orthopaedic implants additionally require mechanical function. The work described herein attempts to address both of these needs. The general strategy involves integrating molecularly designed tissue engineering scaffolds with porous metallic foams...
- Keyword:
- self-assembly, regenerative medicine, peptide amphiphile, tissue engineering, nanotechnology, and Biomaterials
- Subject:
- Materials Science and Engineering
- Creator:
- Timothy David Sargeant
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/27/2018
- Date Modified:
- 08/27/2018
- Date Created:
- 2007-12-07
- Resource Type:
- Dissertation
-
- Description:
- The work presented in this dissertation focuses on ceramic anode materials for solid oxide fuel cells (SOFCs). The primary goal was to characterize the anode and relate the electrochemical behavior to the microstructure. The anode that was most extensively studied in this work was a composite of Gd0.10Ce0.90O1.95 (GDC) and...
- Keyword:
- Engineering and Materials Science
- Subject:
- Materials Science and Engineering
- Creator:
- Worawarit Kobsiriphat
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/29/2018
- Date Modified:
- 08/29/2018
- Date Created:
- 2007-11-30
- Resource Type:
- Dissertation
-
- Description:
- The kinetics of nanoscale Cu-rich precipitates of multicomponent concentrated steels has been investigated utilizing primarily APT and supplemented with a synchrotron radiation experiment, first-principles calculations, Thermo-Calc study, and CTEM (at the longest aging time). Results on mechanical properties and microstructure at a greater length scale are also presented. The studied...
- Keyword:
- nucleation, precipitation, growth and coarsening, atom-probe tomography, phase transformations, and Fe-Cu steels
- Subject:
- Materials Science and Engineering
- Creator:
- R. Prakash Kolli
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/29/2018
- Date Modified:
- 08/29/2018
- Date Created:
- 2007-12-07
- Resource Type:
- Dissertation
-
- Description:
- This dissertation demonstrates how self-assembly can direct nanoscale ordering and optimize electronic properties of organic semiconductors, as well as organic-inorganic hybrids. In excitonic solar cells, controlling the ordering and interfaces between electron-transporting (n-type) and hole-transporting (p-type) domains is crucial. In addressing this challenge, hybrid nanostructures were designed by mineralization of...
- Keyword:
- Engineering and Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Marina Sofos
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/30/2018
- Date Modified:
- 08/30/2018
- Date Created:
- 2007-12-10
- Resource Type:
- Dissertation
-
- Description:
- A novel cryogenic variable temperature UHV STM has been constructed and utilized to investigate the dynamical behavior of isolated organic molecules covalently bound to silicon surfaces. The microscope can be operated from 8-300 K, and exhibits extremely low drift rates. A new design has been implemented for the rails (used...
- Keyword:
- Scanning Tunneling Microscopy; Single Molecule Dynamics; Desorption; Dissociation; Silicon; Cyclopentene
- Subject:
- Materials Science and Engineering
- Creator:
- Nathan Lee Yoder
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/30/2018
- Date Modified:
- 08/30/2018
- Date Created:
- 2007-12-11
- Resource Type:
- Dissertation
-
- Description:
- Two main topics are addressed in this dissertation: (1) adhesion in hydrogels; (2) interfacial interactions between model glassy polymers. A self-assembly technique for the formation of hydrogels from acrylic triblock copolymer solutions was developed, based on vapor phase solvent exchange. Structure formation in the gels was characterized by small angle...
- Keyword:
- hydrogel scaffolds, glassy polymers, diffusion mediated adhesion, Self assembly, DOPA adhesion, and hydrogel
- Subject:
- Materials Science and Engineering
- Creator:
- Murat Guvendiren
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/30/2018
- Date Modified:
- 08/30/2018
- Date Created:
- 2007-08-02
- Resource Type:
- Dissertation
-
- Description:
- Metal nanoparticles in polymeric matrices are of particular scientific interest due to their useful ability to self-assemble into complex nanocomposites. Recent examples involve using ultrathin diblock copolymers coupled with metal nanoparticles in the fabrication of novel electronic, magnetic and photonic devices. As this ordering process takes place far from equilibrium...
- Keyword:
- polymer, x-ray standing wave, and pvp
- Subject:
- Materials Science and Engineering
- Creator:
- Aleta L Hagman
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 08/30/2018
- Date Modified:
- 08/30/2018
- Date Created:
- 2007-09-07
- Resource Type:
- Dissertation
-
- Description:
- The current trend of ceramic nanotechnology has motivated an ever-increasing need to achieve exquisite control over size, shape, and spatial confinement for functional oxide architectures, in an equivalent manner demonstrated for semiconductors. However, the unique nature of ceramics has posed major challenges for most traditional nanofabrication technologies, putting the development...
- Keyword:
- Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Zixiao Pan
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/06/2018
- Date Modified:
- 09/06/2018
- Date Created:
- 2008-03-17
- Resource Type:
- Dissertation
-
- Description:
- The use of composites is increasing as they afford scientists and engineers the ability to combine the advantageous properties of each constituent phase, e.g. metal ductility and ceramic stiffness. With respect to materials design, biomimetics is garnering increasing attention due to the complex, yet efficient, natural microstructures. One such biomimetic,...
- Keyword:
- elastic behavior, mechanical properties, aluminum, fracture, composite, and silicon carbide
- Subject:
- Materials Science and Engineering
- Creator:
- Thomas E Wilkes
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/07/2018
- Date Modified:
- 09/07/2018
- Date Created:
- 2008-05-08
- Resource Type:
- Dissertation
-
- Description:
- The measurement of weak adhesive energies has previously been difficult to obtain. To measure these energies, I designed a technique that uses the combined sensitivities of both a quartz crystal resonator and the inflation of an elastomeric polymer membrane. The surfaces of the quartz crystal and/or the membrane are modified...
- Keyword:
- surface acoustic waves, membranes, quartz crystal microbalance, polymer brushes, permeability, and adhesion
- Subject:
- Materials Science and Engineering
- Creator:
- David Alan Brass
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/11/2018
- Date Modified:
- 09/11/2018
- Date Created:
- 2008-04-17
- Resource Type:
- Dissertation
-
- Description:
- Liquid metal melt-lubrication of high-power and high-speed sliding electrical contacts improves electrical current collection and reduces friction. However, armature material loss may cause transition to arcing or plasma contact. Boundary lubrication of the sliding contact with low melting-point alloys can provide comparable improvement in current collection at reduced temperatures. Bismuth,...
- Keyword:
- liquid metal, electromagnetic launcher, railgun, and lubrication
- Subject:
- Materials Science and Engineering
- Creator:
- Peter Yaw-Ming Hsieh
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/11/2018
- Date Modified:
- 09/11/2018
- Date Created:
- 2008-04-16
- Resource Type:
- Dissertation
-
- Description:
- In recent years, research has expanded the uses of triblock copolymer gels to a wide variety of applications including everything from ceramics processing to regenerative medicine and drug delivery. The research presented in this dissertation focuses on a physically crosslinked, block copolymers gel system in a selective solvent. This system...
- Keyword:
- Engineering and Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Rafael Edmundo Bras
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/13/2018
- Date Modified:
- 09/13/2018
- Date Created:
- 2008-06-23
- Resource Type:
- Dissertation
-
- Description:
- Motivated by performance requirements of future medical stent applications, experimental research addresses the design of novel TiNi-based, superelastic shape-memory alloys employing nanoscale precipitation strengthening to minimize accommodation slip for cyclic stability and to increase output stress capability for smaller devices. Using a thermodynamic database describing the B2 and L21 phases...
- Keyword:
- Engineering and Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Matthew D. Bender
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/13/2018
- Date Modified:
- 09/13/2018
- Date Created:
- 2008-07-21
- Resource Type:
- Dissertation
-
- Description:
- Increasing interest in long-life bone implants with reduced mechanical properties reducing the stress-shielding effect and a structure mimicking bone porous architecture has encouraged study and development of fabrication methods for porous NiTi. The main objective of this work was to advance these goals by developing new processing procedures for porous...
- Keyword:
- Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Ampika Bansiddhi
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/13/2018
- Date Modified:
- 09/13/2018
- Date Created:
- 2008-10-23
- Resource Type:
- Dissertation
-
- Description:
- In this work, electron beam induced current (EBIC) and scanning photocurrent microscopy (SPCM) were used to quantitatively investigate the electronic properties of silicon nanowire devices. For the first time, it was shown that minority carrier diffusion lengths in phosphorous-doped silicon nanowires are significantly reduced from their bulk values because of...
- Keyword:
- carrier concentration, photocurrent, silicon, nanowire, diffusion length, and diode
- Subject:
- Materials Science and Engineering
- Creator:
- Jonathan Edward Allen
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/13/2018
- Date Modified:
- 09/13/2018
- Date Created:
- 2008-11-25
- Resource Type:
- Dissertation
-
- Description:
- A multicomponent bimodal poly(vinyl acetate) (PVAc) polymer composite has been scientifically designed to increase biaxial plastic flow stabilization for the achievement of large biaxial deformations. For this, a systems-based approach was used for the computational materials design of a high performance bubblegum whose mean in-vivo bubble diameter exceeds that of...
- Keyword:
- Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Leslie Dale Morget
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/18/2018
- Date Modified:
- 09/18/2018
- Date Created:
- 2008-11-25
- Resource Type:
- Dissertation
-
- Description:
- Recent assessment of material property requirements for blast resistant applications, especially for the naval ship hulls, has defined the need to design steels with high stretch ductility and fragment penetration resistance, along with high strength and adequate toughness. Using a system based computational materials design approach, two series of austenitic...
- Keyword:
- Engineering
- Subject:
- Materials Science and Engineering
- Creator:
- Padmanava Sadhukhan
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/19/2018
- Date Modified:
- 09/19/2018
- Date Created:
- 2008-08-26
- Resource Type:
- Dissertation
-
- Description:
- Characterizing the interaction of light and matter has become increasingly important in recent decades, as devices scale down, data transfer speeds up, and the use of photon-based technology (photonics and optoelectronics) becomes widespread. Copper chloride (CuCl) thin films and zinc oxide (ZnO) inverse opal photonic crystals are the two material...
- Keyword:
- photonic crystal, copper chloride, exciton, inverse opal, zinc oxide, and plasmon
- Subject:
- Materials Science and Engineering
- Creator:
- Mark Allan Anderson
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/20/2018
- Date Modified:
- 09/20/2018
- Date Created:
- 2008-12-03
- Resource Type:
- Dissertation
-
- Description:
- Subsolidus phase relationships within the ZnO-In<sub>2</sub>O<sub>3</sub>-SnO<sub>2</sub> system at 1275 <sup>o</sup>C were established by conventional solid state reaction methods. No new compounds or structures were observed within the ternary diagram. Equilibrium in the ZnO-corner, between the homologous compounds and the spinel phase, was found difficult to achieve. This problem was overcome...
- Keyword:
- defect chemistry
- Subject:
- Materials Science and Engineering
- Creator:
- Steven Harvey
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 09/20/2018
- Date Modified:
- 09/20/2018
- Date Created:
- 2008-12-01
- Resource Type:
- Dissertation