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1. Unveiling the Origin of a Nonequilibrium Dynamic Process Detected by X-Ray Photon Correlation Spectroscopy via a Finite Element Analysis Approach
Published: 7/1/2014
Authors: Li Ma, Fan Zhang, Andrew John Allen, Lyle E Levine
Abstract: It is a scientific and engineering challenge to characterize materials under nonequilibrium conditions. In recent years, X-ray photon correlation spectroscopy (XPCS), a synchrotron based coherent X-ray scattering technique, has been found useful in - ...

2. Use of Single Particle Inductively Coupled Plasma Mass Spectrometry to Characterize a New Silver Nanoparticle Reference Material
Published: 6/11/2014
Authors: Karen E Murphy, Jingyu Liu, William F Guthrie, Justin M Gorham, John E Bonevich, Andrew John Allen, Michael R Winchester, Vincent A Hackley, Robert MacCuspie
Abstract: In this study we use inductively coupled plasma mass spectrometry operated in single particle mode (spICP-MS) to simultaneously characterize the size distribution and dissolved silver fraction of a new silver nanoparticle (AgNP) candidate reference m ...

3. Just Add Water ‹ reproducible singly dispersed silver nanoparticle suspensions
Published: 6/19/2013
Authors: Robert I. MacCuspie, Andrew John Allen, Matthew N. Martin, Vincent A Hackley
Abstract: Silver nanoparticles (AgNPs) are of interest due to their antimicrobial attributes, which are derived from their inherent instability and subsequent release of silver ions into solution. At the same time, this instability makes achieving stable long ...

4. Flexible Metal Organic Framework Compound, Ni(1,2-bis(4-pyridyl)ethylene)[Ni(CN)4]n, for CO2 Sorption Applications
Published: 4/7/2013
Authors: Winnie K Wong-Ng, Jeffrey T Culp, Yu Sheng Chen, Laura Espinal, Andrew John Allen, Daniel W Siderius, Craig Brown, Wendy Queen, Peter Zavalij, Christopher Matranga
Abstract: New sorbent materials are required for carbon capture because coal-fired electrical power plants, the largest emitters of this greenhouse gas, will continue to produce much of our nation‰s electricity for at least several decades. Within the family o ...

5. 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 ...

6. 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 ...

7. 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 ...

8. 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 ...

9. 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 ...

10. 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 ...

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