Browsing Materials Science and Engineering - Ph.D. / Sc.D. by Title
Now showing items 994-1013 of 1014
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Ultra-lightweight nanorelief networks : photopatterned microframes
(Massachusetts Institute of Technology, 2007)Lightweight nano-network structures in polymers have been fabricated and investigated for their mechanical properties. Fabrication techniques via holographic interference lithography and phase mask lithography were implemented ... -
Ultrastructural studies of the mechanism governing compressive deformation in rigid-rod polymers
(Massachusetts Institute of Technology, 1993) -
The uncommon nature of point defects in organic-inorganic Perovskite solar cells
(Massachusetts Institute of Technology, 2018)Organic-inorganic perovskite solar cells (PSCs) have shown enormous success in the past decade, increasing in power conversion efficiency from ~4% in 2009 to >22%. One of the critical properties that contributed to this ... -
Undercooling and rapid solidification of Fe-Cr-Ni ternary alloys
(Massachusetts Institute of Technology, 1994) -
Understanding and designing carbon-based thermoelectric materials with atomic-scale simulations
(Massachusetts Institute of Technology, 2015)Thermoelectric (TE) materials, which can convert unused waste heat into useful electricity or vice versa, could play an important role in solving the current global energy challenge of providing sustainable and clean energy. ... -
Understanding and designing high power and high energy density cathode materials for lithium ion batteries by experiments and first principles computations
(Massachusetts Institute of Technology, 2012)A new layered compound LiNi2/3Sb1/30 2 was synthesized and tested electrochemically to understand the effect of the transition metals on the structural stability of the layered compound upon Li de-intercalation. The ... -
Understanding and development of combined acoustic and magnetic actuation of Ni₂MnGa single crystals
(Massachusetts Institute of Technology, 2007)Ni-Mn-Ga based ferromagnetic shape memory alloys (FSMAs) have emerged as a promising new class of active materials capable of producing a large (several %) magnetic-field-induced strain (MFIS). FSMAs still have several ... -
Understanding and engineering azobenzene for thermal energy storage
(Massachusetts Institute of Technology, 2017)This thesis focuses on the understanding and engineering of a molecule known as azobenzene which holds unique properties for thermal storage applications. The azobenzene molecule undergoes structural change into a metastable ... -
Understanding defects in germanium and silicon for optoelectronic energy conversion
(Massachusetts Institute of Technology, 2016)This thesis explores bulk and interface defects in germanium (Ge) and silicon (Si) with a focus on understanding the impact defect related bandgap states will have on optoelectronic applications. Optoelectronic devices are ... -
Understanding electronic and optical properties of PbS QDs for improved photovoltaic performance
(Massachusetts Institute of Technology, 2015)Photovoltaic (PV) solar cells that constitute semiconducting sunlight absorber and metallic electrical contacts convert solar energy to electricity. Even though silicon represents roughly 90% of installed solar PV capacity ... -
Understanding the active sites of Mg-Al oxide catalysts in the formation of aromatic platform chemicals from acetaldehyde
(Massachusetts Institute of Technology, 2018)The aromatization of acetaldehyde derived from bio-based feedstocks offers a sustainable route to obtaining valuable BTX (benzene, toluene, and xylenes)-like platform chemicals traditionally produced from petroleum naphtha. ... -
Understanding the catalytic activity of oxides through their electronic structure and surface chemistry
(Massachusetts Institute of Technology, 2016)The intermittent nature of renewable energy sources requires a clean, scalable means of converting and storing energy. Water electrolysis can sustainably achieve this goal by storing energy in the bonds of oxygen and ... -
Understanding the effect of protonation on the self-assembly of a model polyelectrolyte-neutral block copolymer
(Massachusetts Institute of Technology, 2016)Charge-containing polymers are used in a wide variety of commercial products including fuel cell membranes, heat sealing packages, and golf ball covers. Traditionally made as random copolymers of charged and uncharged ... -
Understanding the oxidation and reduction process in transparent conducting oxides
(Massachusetts Institute of Technology, 2019)Transparent conductors play important roles in many optoelectronic devices such as LEDs, thin film solar cells, and smart windows through their ability to efficiently transport both photons and electrons. Simultaneous ... -
Virus-enabled synthesis and 2D/3D assembly of nanowire networks
(Massachusetts Institute of Technology, 2013)Dense networks of high aspect ratio nanowires can provide important functionality to electronic devices through a unique combination of electronic and structural properties including high conductivity, high surface area, ... -
Viscous flow and volume relaxation in simple glass-forming liquids.
(Massachusetts Institute of Technology, 1969) -
Voltage programmable materials
(Massachusetts Institute of Technology, 2015)The physical and chemical properties of nanoscale materials derive largely from structure and composition at interfaces. The possibility to electrically modify these interfacial characteristics would provide a powerful ... -
Wafer surface cleaning for silicon homoepitaxy with and without ECR hydrogen plasma exposure
(Massachusetts Institute of Technology, 1994) -
Wetting of ceramic particulates with liquid aluminum alloys
(Massachusetts Institute of Technology, 1987) -
Wide band-gap nanowires for light emitting diodes
(Massachusetts Institute of Technology, 2015)Wide band-gap nanowires composed of GaN and ZnO are promising materials for unique designs and potential efficiency improvement of light emitting diodes (LEDs) for solid state lighting. The large surface-to-volume ratio ...
