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Materials

Ceramics

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Displaying 726 - 750 of 1323

Gradient Chemical Micropatterns: A Reference Substrate for Surface Nanometrology

August 1, 2005
Author(s)
D Julthongpiput, Michael J. Fasolka, Wenhua Zhang, Tinh Nguyen, Eric J. Amis
We present fabrication routes for a new type of surface specimen that exhibits a micropattern with a gradient in chemical contrast between the pattern domains. Design elements in the specimen allow chemical contrast in the micropattern to be related to

Boundary Lubricated Wear

July 15, 2005
Author(s)
Stephen M. Hsu, R G. Munro, M C. Shen, Richard S. Gates
This chapter reviews the fundamental nature of wear under lubricated conditions and presents a comprehensive view of our current understanding of the wear processes under boundary lubrication conditions. Wear under lubricated conditions can be classified

Rapid Formation of Soft Hydrophilic Silicone Elastomer Surfaces

June 16, 2005
Author(s)
K Efimenko, J A. Crowe, E Manias, D W. Schwark, Daniel A. Fischer, Jan Genzer
We report on the rapid formation of hydrophilic silicone elastomer surfaces by ultraviolet/zone (UVO) irradiation of poly(vinylmethyl siloxane) (PVMS) network films. Our results reveal that the PVMS network surfaces render hydrophilic upon only a short UVO

A Novel Test Method for Measuring Mechanical Properties at the Small-Scale: The Theta Specimen

June 9, 2005
Author(s)
George D. Quinn, Lin-Sien H. Lum, Dan Xiang, Ajitkumar Jillavenkatesa, Li Ma, Douglas T. Smith
A test method has been developed for measuring mechanical properties of material structures at the small-scale. Round or hexagonal rings are compressed vertically on their ends thereby creating a uniform tension stress in a horizontal crossbar that serves

First-Order Raman Spectra of AB' 1/2 B'' 1/2 O 3 Double Perovskites

June 1, 2005
Author(s)
S A. Prosandeev, U Waghmare, Igor Levin, James E. Maslar
First principles computations of Raman intensities were performed for perovskite-like compound CaAl1/2Nb1/2O3 (CAN). This compound features 1:1 (NaCl-type) ordering of Al and Nb superimposed onto the b-b-c+ octahedral tilting. Raman tensor for CAN was

Site Specific X-Ray Photoelectron Spectroscopy Using X-Ray Standing Waves

May 26, 2005
Author(s)
Joseph C. Woicik
The x-ray standing wave technique is an experimental method that can accurately determine the precise crystallographic positions of atoms within a crystalline unit cell. As we have seen in preceding chapters of this book, this unique ability arises from

Machining Cracks in Finished Ceramics

May 16, 2005
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Well prepared strength test specimens and components break from a material s inherent flaws and machining damage has no effect on strength. On the other hand, grinding can create machining flaws that control strength and limit the performance of finished

Magnetic Normal Modes of Nanoelements

May 1, 2005
Author(s)
Robert D. McMichael, Mark D. Stiles
Micromagnetic calculations are used to determine the eigenfrequencies and precession patterns of some of the lowest-frequency magnetic normal modes of submicron patterned elements. For a Permalloy-like ellipse, 350 nm 160 nm 5 nm thick in zero field, the
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