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Displaying 301 - 325 of 1326

Vibrational Modes of Multilayered Ceramic Capacitors

April 28, 2016
Author(s)
Kirsten L. Peterson, Ward L. Johnson, Sudook A. Kim, Paul R. Heyliger
Micron-scale spacing of interleaved electrodes and high-dielectric ceramics in multilayer ceramic capacitors (MLCCs) provide exceptionally high capacitances in small volumes. This has led to MLCCs being the preferred type of capacitor in a wide range of

Lateral Tip Control Effects in CD-AFM Metrology: The Large Tip Limit

January 25, 2016
Author(s)
Ronald G. Dixson, Ndubuisi G. Orji, Ryan Goldband
Sidewall sensing in CD-AFMs usually involves continuous lateral dithering of the tip or the use of a control algorithm and fast response piezo actuator to position the tip in a manner that resembles touch-triggering of coordinate measuring machine (CMM)

Structure of Periodic Crystals and Quasicrystals in Ultrathin Films of Ba-Ti-O

January 7, 2016
Author(s)
Eric J. Cockayne, Marek Mihalkovic, Christopher L. Henley
We model the remarkable thin-film Ba-Ti-O structures formed by heat treatment of an initial perovskite BaTiO$_3$ thin film on a Pt(111) surface. All structures contain a rumpled Ti-O network with all Ti threefold coordinated with O, and with Ba occupying

Charge transfer stabilization of late transition metal oxide nano-particles on a layered niobate support

December 10, 2015
Author(s)
Megan E. Strayer, Thomas Senftle, Jonathan P. Winterstein, Nella M. Vargas-Barbosa, Renu Sharma, Robert M. Rioux, Michael J. Janik, Thomas Mallouk
The interfacial interactions between late transition metal/metal oxide nanoparticles and oxide supports impact catalysts' activity and stability. Here, we report the use of isothermal titration calorimetry (ITC), electron microscopy and density functional

Multi-Scale Effects in the Strength of Ceramics

October 15, 2015
Author(s)
Robert F. Cook
Multiple length-scale effects are demonstrated in indentation-strength measurements of a range of ceramic materials under inert and reactive conditions. Meso-scale effects associated with flaw disruption by lateral cracking at large indentation loads are

THE COMPELLING CASE FOR INDENTATION AS A FUNCTIONAL EXPLORATORY AND CHARACTERIZATION TOOL

September 15, 2015
Author(s)
Robert F. Cook, David B. Marshall, Nitin P. Padture, Michelle L. Oyen, Antonia Pajares, Jodie E. Bradby, Ivar E. Reimanis, Rajan Tandon, Trevor F. Page, George M. Pharr, Brian R. Lawn
The utility of indentation testing for characterizing a wide range of mechanical properties of brittle materials is highlighted in light of recent articles questioning its validity, specifically in relation to the measurement of toughness. Contrary to

Compact X-ray and Extreme-Ultraviolet Light Sources

July 10, 2015
Author(s)
Lahsen Assoufid, Uwe Arp, Patrick Naulleau, Sandra Biedron , William Graves
Bringing the brightness and power of vast synchrotron and free-electron laser sources to the scale of the lab and clinic marks an important next frontier—and could transform the landscape of X-ray science and technology.

The red color in 19th century Thai glass studied by X-ray and optical spectroscopy

July 2, 2014
Author(s)
Bruce D. Ravel, Wantana Klysubun, G. Lawrence Carr, Christoph Hauzenberger
The Temple of the Emerald Buddha in Bangkok, Thailand is noted for its glass mosaic decorations on exterior walls and statuary. The original mosaic artwork dates to the early 19th century and is composed of variously-colored, mirrored glass pieces. In this

Stress mapping of micromachined polycrystalline silicon devices via confocal Raman microscopy

June 15, 2014
Author(s)
Grant A. Myers, Siddharth Hazra, Maarten de Boer, Chris A. Michaels, Stephan J. Stranick, Ryan P. Koseski, Robert F. Cook, Frank W. DelRio
Stress mapping of micromachined polycrystalline silicon devices with components in various levels of uniaxial tension was performed. Confocal Raman microscopy was used to form two-dimensional maps of Raman spectral shifts, which exhibited variations on the

Evolution of electrochemical interfaces in solid oxide fuel cells (SOFC): a Ni and Zr resonant anomalous ultra-small-angle X-ray scattering studywith elemental and spatial resolution across the cell assembly

June 1, 2014
Author(s)
Andrew J. Allen, Jan Ilavsky, Pete R. Jemian, Artur Braun
Electrochemical interfaces are key to the direct conversion of fuels to electrical energy and lend energy converters like solid oxide fuel cells (SOFC) their functionality. Over extended operation at high temperatures, the microstructure of the underlying

Substrate Control of Anisotropic Resistivity in Heteroepitaxial Nanostructured Arrays of Cryptomelane Manganese Oxide on Strontium Titanate

January 15, 2014
Author(s)
Anais E. Espinal, Yonggao Y. Yan, Lichun Zhang, Laura Espinal, Aimee Morey, Barrett O. Wells, Mark Aindow, Steven L. Suib
Resistivity and resistance measurements have been carried out for thin films of cryptomelane-type manganese oxide (OMS-2) grown onto (001), (110) and (111)STO single crystals substrates via pulsed laser deposition. Combined with controlled synthesis and

Measurement, Standards, and Data Needs for CO2 Capture Materials: A Critical Review

October 21, 2013
Author(s)
Laura Espinal, Dianne L. Poster, Winnie K. Wong-Ng, Andrew J. Allen, Martin L. Green
The commercial deployment of cost-effective carbon capture technology is hindered partially by the lack of a proper suite of materials-related standards, data, and measurement methods, which would provide critical information for the systematic design of

Porosity and Its Measurement

September 17, 2013
Author(s)
Laura Espinal
Numerous approaches have been applied for measuring the porosity of materials. The most common techniques are based on gas sorption, liquid intrusion, microscopy, and X-ray and neutron scattering. Each technique provides a characteristic value of porosity

Cubic Silsesquioxanes as Tunable High Performance Coating Materials

June 19, 2013
Author(s)
Christopher Soles, Hyun W. Ro, Aaron M. Forster, Dave J. Krug, Vera Popova, Richard M. Laine
In this manuscript a series of cubic silsequioxane monomers with their eight vertices functionalized with different organic ligands terminated with triethoxysilane groups were acid hydrolyzed, spin cast into thin films, and then vitrified into hard
Displaying 301 - 325 of 1326