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Materials

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Displaying 1401 - 1425 of 2343

A Scanning Probe Investigation of the Role of Surface Motifs in the Behavior of p-WSe(sub2) Photocathodes

October 8, 2015
Author(s)
Jesus M. Velazquez, Jimmy John, Daniel V. Esposito, Adam Pieterick, Ragip Pala, Guofeng Sun, Xinghao Zhou, Zhuangqun Huang, Shane Ardo, Bruce S. Brunschwig, Nathan S. Lewis
The spatial variation in the properties and performance of bare and Pt-decorated p-type WSe(sub2) photocathodes has been investigated by using Scaning Photocurrent Microscopy (SPCM) and Local Spectral Response in solution. Microscale SPCM measurements

Cosolvency and cononsolvency explained in terms of a Flory-Huggins type theory

October 7, 2015
Author(s)
Jack F. Douglas, Jacek Dudowicz, Freed Karl
Standard classic Flory-Huggins (FH) theory is employed to describe the enigmatic cosolvency and co-nonsolvency phenomena for systems of polymers dissolved in mixed solvents. In particular, phase boundaries (spinodals) are calculated for solutions of

Assessment of Water Vapor Diffusion in Firefighters Protective Clothing

October 1, 2015
Author(s)
Shonali Nazare, Christopher W. Meyer, Daniel M. Madrzykowski
Structural firefighters often encounter hot and humid environments during interior firefighting. The water vapor transfer to and from the skin has great influence on thermo-physiological comfort of the firefigher. Quantitative information on water vapor

Assessing the Thermal Protective Performance of Fire Blocking Barrier Fabrics for Residential Upholstered Furniture: Report to Consumer Product Safety Commission for Interagency Agreement CPSC-I-13-0022

September 17, 2015
Author(s)
Shonali Nazare, John R. Shields, Szabolcs Matko, Rick D. Davis
Fire behavior of five barrier fabrics has been evaluated both, as an individual component and as a part of composite samples, using different test methods. The quantitative component test methods selected to characterize fire behavior of barrier fabrics

Structural origins of enhanced capacity retention in novel copolymerized sulfur-based composite cathodes for high-energy density Li-S batteries

September 17, 2015
Author(s)
Vladimir P. Oleshko, Jenny J. Kim, Jennifer L. Schaefer, Steven D. Hudson, Christopher L. Soles, Adam Simmonds, Jared Griebel, Kookheon Char, Jeff Pyun
Poly(sulfur-random-(1,3-diisopropenylbenzene) (poly(S-r-DIB)) copolymers synthesized via inverse vulcanization form high molecular mass electrochemically active polymers capable of realizing enhanced capacity retention (1005 mAh/g at 100 cycles) and

When does a branched polymer becomes a particle?

September 17, 2015
Author(s)
Alexandros Chremos, Jack F. Douglas
Melts with topologically distinct molecular structures are investigated by molecular dynamics simulation. We determine the mean polymer size and shape, and glass transition temperature for each molecular topology. Both in terms of structure and dynamics

Self-terminated Electrodeposition of Iridium Electrocatalysts

September 16, 2015
Author(s)
Thomas P. Moffat
A simple electrochemical process for submonolayer deposition of ultrathin catalytic iridum (Ir) films is demonstrated. The process enables effective utilization of one of nature’s rarest elements while different substrates facilitate the exploration of

Stress in Aluminum Induced by Hydrogen Absorption during Cathodic Polarization

September 16, 2015
Author(s)
Gery R. Stafford, Jae W. Shin, Kurt Hebert
The hydrogen concentration in metals during aqueous corrosion is influenced by the kinetics of hydrogen absorption. Measurements of absorption kinetics are challenged by competing gas evolution and corrosion processes. However, in situ measurements of

The Osmotic Virial Repersentation of the Free Energy of Polymer Mixing

September 14, 2015
Author(s)
Jack F. Douglas, August W. Bosse
In this Letter we derive a new representation of the free energy of polymer mixing. We begin with a Flory-Huggins-like free energy of mixing, and assume that the excess free energy of mixing exhibits an arbitrary dependence on the blend composition that

Direct Immersion Annealing of Thin Block Copolymer Films

September 9, 2015
Author(s)
Jack F. Douglas, Alamgir Karim, Arvind Arvind Modi1, Sarang Bhaway, Bryan D. Vogt, Abdullah Al-Enizi, Ahmed Elzatahry, Ashutosh Sharma
We demonstrate that direct immersion annealing (DIA) greatly enhances the rate at which block copolymer (BCP) films order into stable morphologies when the BCP films are immersed in carefully selected mixtures of good and marginal solvents that can impart

Enhanced Thermoelectric Properties for Cu2ZnSnSe4 with Ga-doping

August 22, 2015
Author(s)
Kaya Wei, Laura Beauchemin, Hsin Wang, Joshua Martin, George S. Nolas
Gallium doped Cu2ZnSnSe4 quaternary chalcogenides with and without excess Cu have been synthesized by elemental reaction and densified using hot pressing in order to investigate their high temperature thermoelectric properties. The resistivity, ρ, and

Classification of Semiconducting Polymeric Mesophases to Optimize Device Post-Processing

August 17, 2015
Author(s)
Chad R. Snyder, Regis J. Kline, Dean M. DeLongchamp, Ryan C. Nieuwendaal, Lee J. Richter, Martin Heeney, Iain McCulloch
Semiconducting polymers form a variety of phases and mesophases that respond differently to post-deposition solvent or thermal treatments. Here it is shown that classification of these materials into their appropriate mesophases can be a useful tool to

In-Situ Method for Measuring the Mechanical Properties of Nafion Thin Films during Hydration Cycles

August 15, 2015
Author(s)
Kirt A. Page, Jae W. Shin, Scott Eastman, Brandon W. Rowe, Sangcheol Kim, Ahmet Kusoglu, Kevin G. Yager, Gery R. Stafford
Perfluorinated ionomers, in particular Nafion, are an essential component in hydrogen fuel cells, as both the proton exchange membrane and the binder within the catalyst layer. During normal operation of a hydrogen fuel cell the ionomer will progressively
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