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You searched on: Author: andrew allen

Displaying records 21 to 30 of 81 records.
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21. Development of Ultrasmall-Angle X-ray Scattering - X-ray Photon Correlation Spectroscopy
Published: 2/1/2011
Authors: Fan Zhang, Andrew John Allen, Lyle E Levine, Jan Ilavsky, Gabrielle G Long, Alec Sandy
Abstract: In this paper, we present the development of ultrasmall-angle X-ray scattering - X-ray photon correlation spectroscopy (USAXS-XPCS). This technique takes advantage of Bonse-Hart crystal optics and is capable of probing the slow equilibrium and nonequ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906111

22. Dispersion Stabilization of Silver Nanoparticles in Synthetic Lung Fluid Studied under In-Situ Conditions
Published: 8/23/2010
Authors: Robert I. MacCuspie, Andrew John Allen, Vincent A Hackley
Abstract: The dispersion stabilization of silver nanoparticles in synthetic lung fluid is studied systematically to determine the key ingredients for colloidal stabilization. A variety of in-situ techniques are used, including dynamic light scattering, UV-Vis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903694

23. Multi-Scale Pore Morphology in Vapor-Deposited Yttria-Stabilized Zirconia Coatings
Published: 6/16/2010
Authors: Derek D. Hass, H. Zhao, Tabbetha A. Dobbins, Andrew John Allen, Andrew J Slifka, H. N.G. Wadley
Abstract: A high pressure, electron-beam directed-vapor deposition process has been used to deposit partially stabilized zirconia containing 7 % yttria by mass at deposition pressures of 7.5 Pa to 23 Pa. Anisotropic ultra-small-angle X-ray scattering (USAXS) w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903655

24. Relationships between Composition and Density of Tobermorite, Jennite, and Nanoscale CaO-SiO2-H2O
Published: 5/16/2010
Authors: Andrew John Allen, Jeffrey Thomas, Hamlin M Jennings
Abstract: Relationships between composition, mass density, and atomic packing density for CaO{SiO2{H2O (C{S{H) gel, the main hydration product of ce- ment, and its mineral analogues tobermorite and jennite, are examined. A phase diagram approach is proposed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903643

25. Hydration kinetics and microstructure development of normal and CaCl2 accelerated tricalcium silicate pastes
Published: 10/26/2009
Authors: Andrew John Allen, Jeffrey J. Thomas, Hamlin M Jennings
Abstract: Microstructure development and the kinetics of hydration of pure tricalcium silicate (C3S) and CaCl2-accelerated C3S pastes were investigated by performing isothermal calorimetry and in situ small-angle neutron scattering (SANS) measurements on para ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903017

26. Glassy Carbon as an Absolute Intensity Calibration Standard for Small Angle Scattering
Published: 8/19/2009
Authors: Andrew John Allen, Jan Ilavsky, Fan Zhang, Gabrielle G Long, Pete R. Jemian
Abstract: Absolute calibration of small-angle scattering (SAS) intensity data (in units of differential cross-section per unit sample volume per unit solid angle) is essential for many important aspects of quantitative SAS analysis, such as obtaining the numbe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901709

27. Characterization of Fly Ash Reactivity in Hydrating Cement by Neutron Scattering
Published: 7/14/2009
Authors: W Bumrongjaroen, Richard A Livingston, Dan A. Neumann, Andrew John Allen
Abstract: A combination of small-angle and inelastic neutron scattering studies are presented to elucidate the different effects of Class F and Class C fly ash additions on microstructure development in hydrating cement (and concrete). Small angle neutron sca ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851096

28. Annealing Behavior of Atomic Layer Deposited HfO2 Films Studied by Synchrotron X-Ray Reflectivity and Grazing Incidence Small Angle Scattering
Published: 6/30/2009
Authors: Martin L Green, Andrew John Allen, J. L. Jordan-Sweet, Jan Ilavsky
Abstract: New results are presented for the annealing behavior of ultrathin complementary-metal-gate-semiconductor (CMOS) gate-dielectric (high-) HfO2 films grown by atomic layer deposition (ALD). A series of ALD HfO2 dielectric films has been stu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854475

29. Ultra-small-angle X-ray scattering at the Advanced Photon Source
Published: 6/12/2009
Authors: Pete R. Jemian, Jan Ilavsky, Andrew John Allen, Fan Zhang, Lyle E Levine, Gabrielle G. Long
Abstract: The design and operation of a versatile ultra-small-angle X-ray scattering (USAXS) instrument at the Advanced Photon Source (APS) at Argonne National Laboratory are presented. The instrument is optimized for the high brilliance and low emittance of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854464

30. Multi-Scale Microstructure Characterization of Solid Oxide Fuel Cell Assemblies with Ultra Small-Angle X-Ray Scattering
Published: 6/11/2009
Authors: Andrew John Allen, Jan Ilavsky, Artur Braun
Abstract: The structure of three solid oxide fuel cell assemblies with 200 micrometers nominal thick-ness in the transverse plane, before and after operation, and with and without sulfur con-taining fuel, is quantified with ultra small angle x-ray scattering ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854440



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