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Materials Science and Engineering
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- Description:
- Two-dimensional materials’ “all-surface” architecture presents a new paradigm for investigations into electron confinement effects and surface phenomena. However, synthesizing, characterizing, and ultimately engineering the properties of 2D materials represents a formidable challenge. This thesis presents several cases of isolating novel 2D materials via vapor-based syntheses. Vapor-based syntheses allow for reproducible...
- Keyword:
- nanoscience, chalcogenides, oxides, and 2D materials
- Subject:
- Materials Science and Engineering
- Creator:
- Eve Dorthea Townsend Hanson
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/18/2019
- Date Modified:
- 02/18/2019
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
-
- Description:
- Lithium ion batteries (LIBs) have been the most prominent electrochemical energy storage technology over the past decades and enabled the wireless evolution of portable electronic devices. Yet the expanded use of renewable but intermittent energy sources coupled with increasing demand for electric transportation vehicles put forward requirements to electrochemical energy...
- Keyword:
- First-principles calculation, Lithium ion battery, and Density functional theory
- Subject:
- Materials Science and Engineering
- Creator:
- Zhengpeng Yao
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/18/2019
- Date Modified:
- 02/18/2019
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
-
- Description:
- Porous metal structures exhibit numerous advantages over dense materials due to their high specific stiffness, strength, damping, energy absorption, and surface areas, making them suitable for applications ranging from actuators to medical implants. However, traditional foam manufacturing methods do not provide sufficient control of the foam micro-architectures, and the creation...
- Keyword:
- additive manufacturing, powder metallurgy, NiTi, porous metal, bone implant, and Ni-Mn-Ga
- Subject:
- Materials Science and Engineering
- Creator:
- Shannon Lee Taylor
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/08/2019
- Date Modified:
- 02/08/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Gels are three-dimensional polymer networks capable of absorbing a large amount of solvent molecules subject to various external stimuli (pH, temperature, light, etc.). They exhibit a rich mechanical behavior and prominent nonlinearity owing to their high flexibility, stimuli-responsiveness and superabsorbency. More compelling are the intriguing morphologies and novel functionalities achieved...
- Keyword:
- anisotropic contraction, fiber-reinforced hydrogels, finite element method, contact, mechanical instability, and gel
- Subject:
- Materials Science and Engineering
- Creator:
- Shuangping Liu
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 02/08/2019
- Date Modified:
- 02/08/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- The limits of miniaturization of electronic device components and the steady need for faster computation power have motivated the discovery and cultivation of low-dimensional materials. Among these, two-dimensional (2D) materials have exhibited a wide range of superlative optoelectronic, thermal and mechanical properties. The interest in 2D materials took-off with the...
- Keyword:
- mixed-dimensional heterostructures, two-dimensional materials, and van der Waals heterostructure
- Subject:
- Materials Science and Engineering
- Creator:
- Itamar Balla
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/25/2019
- Date Modified:
- 01/30/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- There is growing interest in and demand for lightweight, age-hardenable alloys such as aluminum (Al) alloys in the transportation sector. This interest is due to the potential for reducing vehicle mass and thereby improving fuel economy. Precipitation microstructures improve the mechanical properties of materials, such as yield stress, by impeding...
- Keyword:
- Aluminum, Precipitation, First-principles calculation, Ostwald Ripening, Phase Field Model, and Age-hardening
- Subject:
- Materials Science and Engineering
- Creator:
- Kyoungdoc Kim
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/22/2018
- Date Modified:
- 01/29/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Two-dimensional (2D) materials such as graphene exhibit unique, superlative electronic, optical, and mechanical properties that are dictated by the precise atomic structure within each layer. Consequently, control of this atomic-scale configuration is critical to engineering desirable characteristics. To date, however, most 2D materials have been discovered by isolating mono- or...
- Keyword:
- 2D Materials, Borophene, Graphene, Scanning tunneling microscopy, and Silicene
- Subject:
- Materials Science and Engineering
- Creator:
- Andrew Jacob Mannix
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/22/2018
- Date Modified:
- 01/29/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Increasing energy demand due to rapid growth in population and industrialization along with environmental crisis has led to the search for cheap, environmentally friendly, and nontoxic methods for generation of energy. However, most alternative energy sources such as photovoltaic, biofuels, hydraulic power, wind power, and geothermal energy, are characterized by...
- Keyword:
- Sustainable, Biomass, Supercapacitors, Energy storage, and Hydrothermal carbonization
- Subject:
- Materials Science and Engineering
- Creator:
- Deepti Krishnan
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 03/22/2018
- Date Modified:
- 01/28/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Electromagnetic metamaterials composed of colloidally synthesized plasmonic metal nanoparticles offer new opportunities to probe light-matter interactions. The properties of these structures largely depend on the spatial arrangement of nanoparticles within them. Therefore, new assembly strategies that afford a high level of structural control are expected to enable a broad range...
- Keyword:
- DNA-mediated assembly, reconfigurable metamaterials, plasmonic nanoparticles, multicomponent nanoparticle architectures, and electromagnetic metamaterials
- Subject:
- Materials Science and Engineering
- Creator:
- Qingyuan Lin
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/11/2019
- Date Modified:
- 01/11/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- While synthesis and transformation processes to produce monodisperse nanoparticles are empirically well-developed, the pathways for these reactions as well as the exact role of synthetic agents and binding characteristics of surface moieties remain poorly understood. This lack of understanding is primarily due to the paucity of information about nanoparticle structural...
- Keyword:
- CTAB, in-situ, XAFS, nanocage, Galvanic exchange, and nanorods
- Subject:
- Materials Science and Engineering
- Creator:
- Liane Michelle Moreau
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/11/2019
- Date Modified:
- 01/11/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Technology has advanced rapidly, especially in the twenty-first century, influencing our day-to-day life on unprecedented levels. Most such advances in technology are closely linked to, and often driven by, the discovery and design of new materials. It follows that the discovery of new materials can not only improve existing technologies...
- Keyword:
- Materials Discovery, Density Functional Theory, Electrochemistry, Energy Materials, and Batteries
- Subject:
- Materials Science and Engineering
- Creator:
- Soo Kim
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/10/2019
- Date Modified:
- 01/10/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Microkinetic modeling is a powerful tool for creating dynamic and quantitative descriptions of complex systems. These detailed mechanistic models compliment experimental techniques and provide an ability to achieve deeper insights into chemical processes where numerous intermediates are highly reactive and difficult to quantify in the laboratory. This thesis discusses the...
- Keyword:
- volatiles, autoxidation, ethyl linoleate, microkinetic modeling, and oil-based paint
- Subject:
- Materials Science and Engineering
- Creator:
- Lindsay Oakley
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/09/2019
- Date Modified:
- 01/09/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Thin film oxidation is investigated using two modeling techniques in the interest of better understanding the roles of space charge and non-equilibrium effects. An electrochemical phase-field model of an oxide-metal interface is formulated in one dimension and studied at equilibrium and during growth. An analogous sharp interface model is developed...
- Keyword:
- Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Quentin Sherman
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/09/2019
- Date Modified:
- 01/09/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- This work reports studies on the physical properties of collections of nanosheets. First, the configurations of graphene oxide sheets in solution are studied. Polarized optical microscopy reveals quickly and decisively that sheets remain flat and form lyotropic liquid crystals over a wide range of solvent conditions. When solvent conditions are...
- Keyword:
- exfoliated nanosheets, crumpling, ionic conductivity, nanofluidics, and graphene oxide
- Subject:
- Materials Science and Engineering
- Creator:
- Andrew Robert Koltonow
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 01/07/2019
- Date Modified:
- 01/07/2019
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Moving away from fossil fuels requires environmentally friendly and economically viable alternative energy sources. A wide adoption of new technologies for energy production and storage depends on better performing materials. Computational methods, such as electronic structure calculations and machine learning, hold the promise to work in conjunction with traditional experimentation...
- Keyword:
- Perovskites, Hydrogen production, Water splitting, Density functional theory, Materials discovery, and Machine learning
- Subject:
- Materials Science and Engineering
- Creator:
- Antoine Alexandre Emery
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/22/2018
- Date Modified:
- 10/22/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Supported metal catalysts find many important uses in areas including chemical production, petroleum refining and emission control. The catalytic behavior of a supported metal catalyst is influenced by size and type of reaction sites on metal nanoparticles. For many structure insensitive reactions catalyzed by the supported metal catalysts, smaller metal...
- Keyword:
- Material Science
- Subject:
- Materials Science and Engineering
- Creator:
- Zhenyu Bo
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/21/2018
- Date Modified:
- 10/21/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Over the last 20 years a new field of amorphous transparent conducting oxides (a-TCOs) has developed. The amorphous nature of these films makes them well suited for large area applications. In addition, a-TCOs can be made at low temperatures and through solution processing methods. These assets provide promising opportunities to...
- Keyword:
- Structure-Property Relationships in Amorphous Transparent Conducting Oxides
- Subject:
- Materials Science and Engineering
- Creator:
- Stephanie Lucille Moffitt
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/12/2018
- Date Modified:
- 10/12/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Atom probe tomography (APT) was used to analyze doping and alloying in low-dimensional electronic materials including thin film heterostructures, van der Waals materials, and colloidal quantum dots (QDs). Firstly, APT was used to reveal structure-property relationship for low-dimensional thin film semiconductors used in electronic and opto-electronic devices. APT was shown...
- Keyword:
- low-dimensional electronic materials, InGaN/GaN QWs, doping and alloying, atom probe tomography, and 2D materials
- Subject:
- Materials Science and Engineering
- Creator:
- Xiaochen Ren
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/12/2018
- Date Modified:
- 10/12/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- Carbonate minerals are integral to life on earth, as reservoirs for CO2 in the earth’s natural carbon cycle and as the skeletal elements of abundant organisms like corals and plankton. Because of its relevance, availability, and low toxicity, calcium carbonate is also an important model system for phase transformations in...
- Keyword:
- gortatowskite, balcite, nucleation, metastable, confinement, and ACC
- Subject:
- Materials Science and Engineering
- Creator:
- Michael Whittaker
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/09/2018
- Date Modified:
- 10/09/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation
-
- Description:
- High performance structural materials are needed for Naval applications which require an excellent combination of yield strength, low-temperature impact toughness, ductility, ballistic-resistance, and weldability. This research investigates precipitation-strengthened HSLA-115 steels and ballistic-resistant 10 wt. % Ni steels, which have emerged as promising alternatives to the widely used HSLA-100 steels for...
- Keyword:
- Atom Probe Tomography
- Subject:
- Materials Science and Engineering
- Creator:
- Divya Jain
- Owner:
- Scholarly Digital Publishing
- Date Uploaded:
- 10/09/2018
- Date Modified:
- 10/09/2018
- Date Created:
- 2017-01-01
- Resource Type:
- Dissertation