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Materials

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Displaying 1551 - 1575 of 2329

Packing density of rigid aggregates is independent of scale

May 14, 2014
Author(s)
Christopher D. Zangmeister, James G. Radney, Michael R. Zachariah
Large planetary seedlings, comets, microscale pharmaceuticals, and nanoscale soot particles are made from rigid, aggregated subunits that are compacted under low compression into larger structures spanning over 10 orders of magnitude in dimensional space

DNA-based Nanocomposite Bio-Coatings for Fire Retarding Polyurethane Foam

May 2, 2014
Author(s)
Yu-Chin Li, Yeon S. Kim, John R. Shields, Rick D. Davis
Layer-by-Layer (LbL) assembled multilayer thin films of deoxyribonucleic acid (DNA), chitosan (CHI), and montmorillonite (MMT), were studied in an effort to produce fully renewable, bio-based fire retardant coatings for flexible polyurethane foam. The PUF

Tearing and scrolling of transferred graphene

April 29, 2014
Author(s)
Guangjun Cheng, Brent A. Sperling, James E. Maslar, Curt A. Richter, Angela R. Hight Walker
We present an investigation on tearing and scrolling of the transferred graphene on a Si/SiO2 substrate. Graphene grown by chemical vapor deposition (CVD) is transferred onto a Si/SiO2 substrate using a wet polymer-mediated process. Upon the removal of

Measuring Organelle Shape in 3D in Stem Cells Cultured on Nanofiber Scaffolds

April 19, 2014
Author(s)
Carl G. Simon Jr., Peter Bajcsy, Wojtek J. Tutak, Jyotsnendu J. Giri
Previous work has demonstrated that culture of osteoprogenitor cells on nanofiber scaffolds can potentiate osteogenic differentiation [1-4]. Culture of cells in nanofiber scaffolds causes changes to cell morphology, suggesting that morphological changes

Preparation of nanocomposite plasmonic films made from cellulose nanocrystals or mesoporous silica decorated with unidirectionally aligned gold nanorods

April 11, 2014
Author(s)
Michael Campbell, Qingkun Liu, Aric Sanders, Julian Evans, Ivan I. Smalyukh
Using liquid crystalline self-assembly of cellulose nanocrystals, we achieve long-range alignment of anisotropic metal nanoparticles in colloidal nanocrystal dispersions that are then used to deposit thin structured films with ordering features highly

Recent Advances in Focused Ion Beam Technology and Applications

April 11, 2014
Author(s)
Nabil Bassim, Keana Scott, Lucille A. Giannuzzi
Focused ion beam (FIB) microscopes are extremely versatile and powerful instruments for materials research. These microscopes, when coupled in a system with a scanning electron microscope (SEM), offer the opportunity for novel sample imaging, sectioning

A Quantitative Study of Nanoparticle Release from Nanocoatings Exposed to UV Radiation

April 7, 2014
Author(s)
Li Piin Sung, Deborah S. Jacobs, Justin M. Gorham, Savelas A. Rabb, Xiaohong Gu, Lee L. Yu, Tinh Nguyen
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in

Superconformal Copper Electrodeposition in Complexed Alkaline Electrolyte

April 3, 2014
Author(s)
Daniel Josell, Thomas P. Moffat
This paper examines superconformal filling of trenches during copper electrodeposition from alkaline cupric tartrate electrolyte. Extreme bottom-up filling of submicrometer damascene trenches with minimal deposition on the sidewalls and the field around

Measuring Stem Cell Dimensionality in Tissue Scaffolds

April 1, 2014
Author(s)
Carl G. Simon Jr., Sapun Parekh, Christopher K. Tison, Girish Kumar, Tanya M. Farooque, Charles H. Camp
Many 3D scaffold systems have evolved for tissue engineering, drug screening and in vitro tissue models. However, it is not clear which scaffolds provide a 3D cell niche and there is no clear way to measure cell niche dimensionality. Advances in 3D niche

A nonlinear model for gusset plate connections

March 15, 2014
Author(s)
Dat Duthinh, Chiara Crosti
The investigation of the 2007 collapse of the I-35 W Bridge in Minnesota, United States, used very detailed nonlinear finite-element (FE) analysis, which is too difficult for routine design. On the other hand, simple guidelines amenable to hand

Structure-Property Relationships in Polyethylene Fusion Bonds

February 24, 2014
Author(s)
Aaron Forster, Kar T. Tan, Wei-Lun Ho, Donald Hunston
Polyethylene (PE) is used significantly for a wide range of critical fluid transport applications from water to fossil fuels. The advantages of polyethylene are competi-tive cost compared to metallic pipe, lower corrosion rates, and toughness. The key to

Inverse Vulcanization of Elemental Sulfur to Prepare Polymeric Electrode Materials for Li-S Batteries

February 20, 2014
Author(s)
Christopher L. Soles, Vladimir P. Oleshko, Jenny J. Kim, Adam Simmonds, Jared Griebel, Jeff Pyun, Jungjin Park, Woo Jin Chung, Woo Tae Kim, Richard Glass, Yung-Eun Sun, Kookheon Char
Sulfur-rich copolymers were synthesized via inverse vulcanization to create electroactive cathode materials for lithium-sulfur battery applications. These materials exhibit enhanced capacity retention (1005 mAh/g at 100 cycles) and extended battery

Role of salt on adhesion of an epoxy/aluminium (oxide) interface in aqueous environments

February 16, 2014
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Justin M. Gorham, Aaron M. Forster, Vogt D. Bryan
The durability of adhesive joints in hostile environments is a major area of concern in structural adhesive bonding. Therefore, understanding the mechanics and mechanisms of degradation of adhesive joints is a key factor for more extensive use in future

Designing High-Performance PbS and PbSe Nanocrystal Electronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic Layer Deposition

February 6, 2014
Author(s)
Soong Ju Oh, Nathaniel E. Berry, Hi-Hyuk Choi, E. A. Gaulding, Hangfei Lin, Taejong Paik, Benjamin T. Diroll, Shinichiro Muramoto, Murray B. Christopher, Cherie R. Kagan
We report a facile, solution based, post synthetic colloidal atomic layer deposition (PS-cALD) process to engineer the surface stoichiometry and therefore electronic properties of lead chalcogenide nanocrystal (NC) thin films. Using the stepwise and

A multicomponent phase-field model for extremely large partition coefficients

January 31, 2014
Author(s)
Michael J. Welland, Dieter Wolf, Jonathan E. Guyer
We develop a multi-component phase-field model specially formulated to robustly simulate concentration variations from molar to atomic magnitudes across an interface, i.e.: partition coefficients in excess of 10 (superscript 10plus23) such as may be the
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