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Displaying 1901 - 1925 of 2146

Shear Bond Strength of Bioactive Amorphous Calcium Phosphate Composites

November 1, 2007
Author(s)
Gary E. Schumacher, Joseph M. Antonucci, Justin N. O'Donnell, Drago Skrtic
Bioactive, amorphous calcium phosphate (ACP)-filled polymeric composites in aqueous environments release significant amounts of Ca and PO4 ions leading to deposition of an apatitic mineral that is similar to that found in enamel. These materials are

Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates

October 24, 2007
Author(s)
Vijay Tirumala, R A. Pai, Sumit Agarwal, Curran Chandler, Gaurav Bhatnagar, Alvin Omang, Eric K. Lin, J J. Watkins
Well ordered mesoporous silica films were prepared by infusion and selective condensation of Si alkoxides within pre-organized block copolymer/homopolymer blend templates using supercritical CO2 as the delivery medium. The morphologies of mesoporous silica

E-Glass/DGEBA/m-PDA Single Fiber Composites: Interface Debonding During Fiber Fracture

October 1, 2007
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston, Walter G. McDonough
In this paper, we examine the regions of debonding between the fibers and the matrix surrounding fiber breaks formed during single-fiber fragmentation tests. The materials used were E-glass fibers embedded in a matrix of diglycidyl ether of bisphenol-A

Raman Spectroscopy of n-Type and p-Type GaSb with Multiple Excitation Wavelengths

October 1, 2007
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
The interpretation of Raman spectra of GaSb can be complicated by the presence of a so-called surface space-charge region (SSCR), resulting in an inhomogeneous near-surface Raman scattering environment. To fully interpret Raman spectra, it is important to

Evaluation of Thin Film Mechanical Properties by Means of Electrical Test Methods

September 30, 2007
Author(s)
Nicholas Barbosa, Robert Keller, David T. Read, Richard P. Vinci
The ability to measure the mechanical properties of thin films and small scale structures is essential in designing reliable components at the micro- and nano-scales. It is known that the mechanical properties of thin film materials deviate from relations

Tunable Ionic-Conductivity of Collapsed Sandia Octahedral Molecular Sieves (SOMS)

September 12, 2007
Author(s)
Jason D. Pless, Terry J. Garino, James E. Maslar, Tina M. Nenoff
The structure-property relationship between atomic cation substitution and bulk scale conductivity in perovskites has been studied systematically. A series of Na-Nb perovskites has been synthesized via two methods (1) ion-exchange or (2) synthetic metal

NIST Workshop on Materials Test Procedures for Hydrogen Pipelines

September 1, 2007
Author(s)
Thomas A. Siewert, Joseph D. McColskey, Richard E. Ricker
The Materials Reliability and Metallurgy Divisions have expanded their efforts to advance the technology for the construction, repair, and inspection of pipelines. One key factor is to identify and prioritize the research needs of the pipeline community

Analysis of Welding Parameter Distribution in Stud Arc Welding

July 15, 2007
Author(s)
Ivan Samardzic, Stefanija Klaric, Thomas A. Siewert
This paper describes the application of on-line monitoring system for recording welding current and voltage during stud arc welding with a ceramic ferrule. Recorded values of welding current and voltage are analyzed off-line for the weld process with both

Tuning Polymer Melt Fragility With Antiplasticizer Additives

June 19, 2007
Author(s)
Robert A. Riggleman, Jack F. Douglas, J J. de Pablo
A polymer-diluent model exhibiting antiplasticization has beendeveloped and characterized by molecular dynamics simulations. Antiplasticizer molecules are shown to decrease the glass transition temperature Tg, but to increase the elastic moduli of the

Computer Simulations of Ionomer Self-Assembly and Dynamics

May 17, 2007
Author(s)
Moonjoy Goswami, S K. Kumar, Aniket Bhattacharya, Jack F. Douglas
Computer simulations of a model telechelic ionomer, i.e. a melt with a charge at each chain end along with neutralizing counterions, indicate a form of self-assembly that is hybrid between the packing driven interactions in block copolymers and the

Influence of Indium-Tin Oxide Surface Structure on the Ordering and Coverage of Organosilane, Carboxylic Acid and Thiol Monolayers

May 17, 2007
Author(s)
M Cerruti, C Rhodes, M Losego, A Efremenko, Jon-Paul Maria, Daniel A. Fischer, D L. Feldheim, S Franzen, Jan Genzer
We report on the formation of organosilane-, carboxylic acid- and thiol-based self assembled monolayers (SAMs) on two lots of commercially prepared Indium Tin Oxide (ITO) thin films. Contact angle measurements, electrochemical experiments, and near-edge x
Displaying 1901 - 1925 of 2146