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Materials

Ceramics

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Displaying 651 - 675 of 1323

X-Ray and Neutron Powder Diffraction Studies of (Ba 1-x Sr x )Y 2 CuO 5

May 18, 2006
Author(s)
Zhi Yang, Winnie K. Wong-Ng, James A. Kaduk, Qingzhen Huang, Lawrence P. Cook
This paper reports the results of the crystallography and crystal chemistry investigation of the (Ba1-xSrx)Y2 CuO5 ( green phase ) solid solution series by x-ray powder diffraction (XPD) and neutron powder diffraction (NPD) methods. The single phase region

Characterization of the Skin Orientation of Thermotropic Liquid-Crystalline Copolyester Moldings with Near-Edge X-ray Absorption Fine Structure

May 11, 2006
Author(s)
Robert A. Bubeck, L S. Thomas, S Rendon, W R. Burghardt, A Hexemer, Daniel A. Fischer
The process of injection molding net-shape parts from thermotropic liquid crystalline polymers (TLCPs) results in a skin-core macrostructure. The underlying orientation in the core and the skin may differ both in magnitude and direction. A combination of

Effect of Self-Assembled Monolayer Film Order on Nanofriction

May 11, 2006
Author(s)
S Sambasivan, S Hsieh, Daniel A. Fischer, Stephen M. Hsu
Self-assembled monolayers (SAMs) have increasingly being explored as potential protective films in devices friction and adhesion. However, accurate determination of the nanomechanical properties of monolayer films is difficult and fraught with

Probing the Ordering of Semiconducting Fluorene-Thiophene Copolymer Surfaces on Rubbed Polyimide Substrates by Near-Edge X-Ray Absorption Fine Structure

May 11, 2006
Author(s)
L R. Pattison, A Hexemer, E. J. Kramer, Sitaraman Krishnan, P Petroff, Daniel A. Fischer
The temperature-dependent alignment of semiconducting liquid crystalline fluorene-thiophene copolymer (F8T2) thin film surfaces was investigated using the near-edge X-ray absorption fine structure (NEXAFS) technique. Partial electron yield spectra were

Texture Measurements in 001> Fiber-Oriented PMN-PT

April 9, 2006
Author(s)
Kristen H. Brosnan, G L. Messing, Richard J. Meyer, Mark D. Vaudin
Textured (1-x)(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) ceramics obtained by the templated grain growth (TGG) process a significant fraction of the piezoelectric properties of the Bridgman growth single crystals at a fraction of the cost. These materials could have

Failure of Glass Layers on Polymeric Substrates From Vickers Indentation

March 25, 2006
Author(s)
Herzl Chai, Brian R. Lawn
A study is made of median crack evolution in brittle coatings subjected to sharp contacts. A model bilayer system consisting of a glass plate bonded to a polycarbonate base, with a Vickers pyramid as indenter, is used to demonstrate the evolution in situ

Local Structures and Raman Spectra in the Ca(Zr,Ti)O 3 Perovskite Solid Solutions

February 7, 2006
Author(s)
Igor Levin, Eric J. Cockayne, M W. Lufaso, Joseph C. Woicik, James E. Maslar
Local structures and cation distributions in perovskite Ca(Zr, Ti)O3 solid solutions were analyzed using X-ray absorption fine structure and pair-distribution functions obtained from total neutron scattering. The analyses revealed that the Zr-O and Ti-O

Quantification of the Meniscus Effect in Adhesion Force Measurements

February 1, 2006
Author(s)
Jaroslaw Grobelny, Pradeep N. Namboodiri, Doo-In Kim, Z C. Ying
Adhesion forces between a gold sphere and flat gold substrate are studied using atomic force microscopy in different environments. The pull-off force measured in vacuum is found to be a small fraction of that in ambient air or nitrogen atmosphere. In

Comparison of the Fouling Release Properties of Hydrophobic Fluorinated and Hydrophilic PEGylated Block Copolymer Surfaces

January 19, 2006
Author(s)
S Krishman, N Wang, Christopher K. Ober, J Finlay, M E. Callow, J A. Callow, A Hexemer, K E. Sohn, E J. Kramer, Daniel A. Fischer
To understand the role of surface-wettability on adhesion of cells, the attachment of two different marine algae was studied on hydrophobic and hydrophilic polymer surfaces. Adhesion of cells of the diatom Navicula and sporelings (young plants) of the

Surfaces of Fluorinated Pyridinium Block-Copolymers with Enhanced Antibacterial Activity

January 19, 2006
Author(s)
Sitaraman Krishnan, R J. Ward, A Hexemer, K E. Sohn, K L. Lee, E R. Angert, Daniel A. Fischer, E J. Kramer, Christopher K. Ober
Polystyrene-block-poly(4-vinylpyridine) copolymers were quaternized with 1-bromohexane and 6-perfluorooctyl-1-bromohexane. Surfaces prepared from these polymers were characterized by contact angle measurements, near-edge X-ray absorption fine structure

Wake Fields in the Electron Gas Including Transverse Response

January 19, 2006
Author(s)
Eric J. Cockayne, Zachary H. Levine
Relativistic electrons have transverse electric fields comparable in magnitude to the longitudinal fields. We determine the relative effects of transverse and longitudinal fields of a moving point charge on the dielectric response of a uniform electron gas

First Principles Based Simulations of Relaxor Ferroelectrics

January 16, 2006
Author(s)
Benjamin P. Burton, Eric J. Cockayne, Silvia Tinte, U Waghmare
The phenomenology of Pb(B,B$ {\prime}$)O$_{3}$, perovskite based relaxor ferroelectrics is reviewed, with emphasis on the relationship between chemical short-range order and the formation of polar nanoregions in the temperature range between the freezing
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