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Author: andrew allen

Displaying records 11 to 20 of 73 records.
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11. Selective Adsorption of CO2 from Light Gas Mixtures Using a Structurally Dynamic Porous Coordination Polymer
Published: 4/29/2011
Authors: Winnie K Wong-Ng, Andrew John Allen, Laura Espinal, Kristi L Kauffman, Jeffrey T Culp, Angela Goodman, Thomas D Brown, Mark P Bernardo, Russel J Pancoast, Danielle Chirdon, Christopher Matranga
Abstract: The selective adsorption of CO2 from binary mixtures of N2 and CH4 was investigated using a structurally dynamic porous coordination polymer, catena-bis(dibenzoylmethanato)-(4,4‰bipyridyl)nickel (II), ,NiDBM-Bpy‰, as the separation sorbent. A third g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908322

12. High Resolution Reference X-ray Diffraction Pattern for Bis(2-methylimidazolyl)-Zinc, C8H10N4Zn (ZIF-8)
Published: 4/24/2011
Authors: Winnie K Wong-Ng, James A Kaduk, Laura Espinal, Matthew Suchomel, Andrew John Allen
Abstract: The family of zeolitic imidazolate framework (ZIF) compounds are efficient sorbent materials that can be used for catalytic, ion exchange, gas storage and gas separation applications. A high resolution reference x-ray powder diffraction pattern for o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906156

13. Challenges for Physical Characterization of Silver Nanoparticles Under Pristine and Environmentally Relevant Conditions
Published: 3/17/2011
Authors: Robert I. MacCuspie, Kim Rogers, Manomita Patra, Zhiyong Suo, Andrew John Allen, Matthew N. Martin, Vincent A Hackley
Abstract: The conditions used to disperse silver nanoparticles (AgNPs) strongly impact their resulting size measurements and agglomeration state, based on the underlying metrology and physical chemistry, respectively. A series of AgNP materials with reported ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907651

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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



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