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You searched on: Author: andrew allen

Displaying records 11 to 20 of 81 records.
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11. Improved Synthesis and Crystal Structure of the Flexible Pillared Layer Porous Coordination Polymer: Ni(1,2-bis(4-pyridyl)ethylene)[Ni(CN)4]
Published: 4/4/2013
Authors: Winnie K Wong-Ng, Jeffrey T Culp, Yu-Sheng Chen, Peter Zavalij, Laura Espinal, Daniel W Siderius, Andrew John Allen, Steve Scheins, Christopher Matranga
Abstract: A new method of synthesis was developed for the flexible coordination polymer Ni(L)[Ni(CN)4], L=1,2-bis(4-pyridyl)ethylene (bpene) to increase its CO2 sorption uptake. The structure of the newly synthesized bpene has been determined by synchrotron X ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912264

12. Structure and Dynamics Studies of Concentrated Micrometer-Sized Colloidal Suspensions
Published: 1/7/2013
Authors: Fan Zhang, Andrew John Allen, Lyle E Levine, Jan Ilavsky, Gabrielle Gibbs Long
Abstract: We present an experimental study of the structural and dynamical properties of concentrated suspensions of a series of different sized polystyrene microspheres dispersed in glycerol for volume fraction concentrations between 10 % and 20 %. The static ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912414

13. Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source, History, Recent Development, and Current Status
Published: 1/1/2013
Authors: Andrew John Allen, Fan Zhang, Lyle E Levine, Gabrielle Gibbs Long, Jan Ilavsky, Pete R. Jemian
Abstract: The history and development over more than 25 years is presented and discussed of an ultra-small-angle X-ray scattering (USAXS) instrument dedicated to serving a broad range of materials research needs. This history is traced from the instrument‰s o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911113

14. High-energy Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source
Published: 12/1/2012
Authors: Andrew John Allen, Lyle E Levine, Fan Zhang, Gabrielle Gibbs Long, Jan Ilavsky, Pete R. Jemian
Abstract: This paper reports recent tests performed on the Bonse-Hart-type ultra-small angle X-ray scattering (USAXS) instrument at the Advanced Photon Source with higher-order reflection optics , Si (440) instead of Si (220) , and with X-ray energies greate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911966

15. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907783

16. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909707

17. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906876

18. 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 G. 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

19. 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

20. 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



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