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Now showing items 31-40 of 252
Multiscale chemomechanics of polymer deformation under contact : predicting structure-property correlations from the bulk to the interphase
(Massachusetts Institute of Technology, 2008)
The development of nanoscale polymeric materials for mechanical applications necessitates advances in small-volume experimental techniques and analyses that reflect the viscoelastoplastic behavior of such materials. In ...
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 ...
First principles study of effect of surface structure on chemical activity of Pt electrocatalysts in fuel cells
(Massachusetts Institute of Technology, 2008)
To facilitate commercialization of fuel cell systems as alternative energy device, the enhancement of Pt electrocatalysts activity is one of the most challenging issues. The first step to the solution is elucidating ...
Nanomechanical studies of metallic glasses at ambient and elevated temperatures
(Massachusetts Institute of Technology, 2009)
Bulk metallic glasses, though attractive for use in structural applications for their high strength and elastic limit, display several unacceptable features upon deformation, including quasi-brittle failure along shear ...
Controlling morphology of multi-component block copolymer based materials
(Massachusetts Institute of Technology, 2009)
The ability of block copolymers to self-assemble into ordered microstructures has attracted much interest both from a pure scientific perspective and for their potential in numerous industrial applications. The microphase ...
Polymeric photonic crystals
(Massachusetts Institute of Technology, 2000)
Two novel and practical methods for controlling the propagation of light are presented: First. a design criterion that permits truly omnidirectional reflectivity for all polarizations of incident light over a wide selectable ...
Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films
(Massachusetts Institute of Technology, 2007)
Amphiphilic comb-type graft copolymers comprising a poly(methyl methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, ...
Mechanism of oxygen reduction reaction on transition metal oxide catalysts for high temperature fuel cells
(Massachusetts Institute of Technology, 2008)
The solid oxide fuel cell (SOFC) with its high energy conversion efficiency, low emissions, silent operation and its ability to utilize commercial fuels has the potential to create a large impact on the energy landscape. ...
Physical properties and design of light-emitting devices based on organic materials and nanoparticles
(Massachusetts Institute of Technology, 2009)
This thesis presents the detailed experimental and theoretical characterization of light-emitting devices (LEDs) based on organic semiconductors and colloidal quantum dots (QDs). This hybrid material system has several ...
Ordered arrays of nanocrystals : synthesis, properties and applications
(Massachusetts Institute of Technology, 2007)
Nanoscale materials, including nanocrystals and carbon nanotubes, exhibit an appealing array of physical properties, and provide an interesting prospect for research both from a fundamental as well as a technological ...