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You searched on: Author: andrew allen

Displaying records 11 to 20 of 76 records.
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11. Ultra-Small-Angle X-ray Scattering,X-ray Photon Correlation Spectroscopy: A New Measurement Technique for in-situ Studies of Equilibrium and Nonequilibrium Dynamics
Published: 5/1/2012
Authors: Fan Zhang, Andrew John Allen, Lyle E Levine, Jan Ilavsky, Gabrielle G. Long
Abstract: Ultra-small-angle X-ray scattering,X-ray photon correlation spectroscopy (USAXS-XPCS) is a novel measurement technique for the study of equilibrium and slow nonequilibrium dynamics in disordered materials. This technique fills an existing gap between ...

12. Time dependent CO2 sorption hysteresis in a one-dimensional microporous octahedral molecular sieve
Published: 4/6/2012
Authors: Laura Espinal, Winnie K Wong-Ng, Andrew John Allen, Daniel W Siderius, Chad R Snyder, Eric J Cockayne, Lan (Lan) Li, James A. Kaduk, Anais E. Espinal, Steven L. Suib, Chun Chiu
Abstract: A critical challenge in the development of novel carbon capture materials with engineered porous architectures is to understand and control the phenomenon of sorption hysteresis, whereby the path to adsorption of gas molecules by the porous host diff ...

13. Ultra-small-Angle X-ray Scattering ‹ X-ray Photon-Correlation Spectroscopy Studies of Incipient Structural Changes in Amorphous Calcium Phosphate Based Dental Composites
Published: 2/28/2012
Authors: Fan Zhang, Andrew John Allen, Lyle E Levine, Laura Espinal, Joseph M Antonucci, Drago Skrtic, Justin N.R. O'Donnell, Jan Ilavsky
Abstract: The local structural changes in amorphous calcium phosphate (ACP) based dental composites were studied upon heating using both static, bulk measurement techniques and recently developed ultra-small angle X-ray scattering ‹ X-ray photon correlation sp ...

14. 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 ...

15. 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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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