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Bioscience

Biomaterials

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Displaying 801 - 825 of 3439

Hydrodynamic Behavior of Carbon Nanotubes and Characterization of Length Distributions

February 28, 2014
Author(s)
Carlos A. Silvera Batista, Ming Zheng, Constantine Y. Khripin, Xiaomin X. Tu, Jeffrey Fagan
The sedimentation behavior of SWCNTs was studied through analytical ultracentrifugation. SWCNTs were dispersed with the aid of surfactants, doubly sorted by density and length to produce samples with invariant diameter distributions and aspect ratios that

Micro-Deformation in the Fracture of a Toughened Epoxy

February 24, 2014
Author(s)
Donald Hunston, Cyril Clerici, Aurelien Blond, Aaron M. Forster
Thermoset resins are used in many composites and structural adhesives because they have excellent proper-ties. Unfortunately, they tend to be quite brittle. Over the last 50 years, there has been a major effort to improve the toughness of thermosets, and

Structure-Property Relationships in Polyethylene Fusion Bonds

February 24, 2014
Author(s)
Aaron M. Forster, Kar T. Tan, Wei-Lun Ho, Donald L. 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

Fast Proton Conduction Facilitated by Minimum Water in a Series of Divinylsilyl-11-Silicotungstic Acid-co-Butyl Acrylate-co-Hexanediol Diacrylate Polymers

January 9, 2014
Author(s)
Lauren F. Greenlee, Andrew M. Herring, James L. Horan, Anitha Lingutla, Hui Ren, Mei-Chen Kuo, Sonny Sachdeva, Yuan Yang, Soenke Seifert, Michael A. Yandrasits, Steven J. Hamrock, Matthew H. Frey
Studies of proton transport in novel materials are important to enable a large array of electrochemical devices. In this study, we show that heteropoly acids (HPAs) when immobilized in polymer matrices have highly mobile protons. Divinyl-11-silicotungstic

Switching the Adhesive State of Catacholic Hydrogels using Phototitration

November 19, 2013
Author(s)
Evan M. White, Jonathan Seppala, Parker M. Rushworth, Suraj Sharma, Jason Locklin
A polyacrylamide hydrogel system that can be liquefied by remote activation using UV irradiation was investigated as a degradable adhesive. The linear polyacryamide copolymer, formed by conventional free-radical polymerization, contains biomemetic catechol

Airbrushed Nanofiber Scaffolds Support Bone Marrow Stromal Cell Differentiation

November 1, 2013
Author(s)
Carl G. Simon Jr., Wojtek J. Tutak, Sumona Sarkar, Tanya M. Farooque, Jyotsnendu J. Giri, Dongbo Wang, Sheng Lin-Gibson, Joachim Kohn, Durgadas Bolikal
Nanofiber scaffolds are effective for tissue engineering since they emulate the fibrous nanostructure of native extracellular matrix (ECM). Although electrospinning has been the most common approach for fabricating nanofiber scaffolds, airbrushing

Elasticity and rigidity percolation in networks of type-purified single-wall carbon nanotubes on flexible substrates

October 29, 2013
Author(s)
John M. Harris, JiYeon Huh, Matthew R. Semler, Christopher Stafford, Steven Hudson, Jeffrey Fagan, Erik K. Hobbie
Wrinkles and folds in compressed thin films of type-purified single-wall carbon nanotubes (SWCNTs) on polydimethylsiloxane (PDMS) substrates are used to study the mechanical response of pristine nanotube networks. While the low-strain plateau moduli are

Swelling of Ultrathin Molecular Layer-by-Layer Polyamide Water Desalination Membranes

September 30, 2013
Author(s)
Edwin P. Chan, Allison P. Young, Jung-Hyun Lee, Christopher M. Stafford
The water vapor swelling behavior of ultrathin crosslinked aromatic polyamide films, synthesized via molecular layer-by-layer deposition, is characterized via specular X-ray reflectivity. The results show that these films expand only along the thickness
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