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Search Publications by: Antonio Faraone (Fed)

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Displaying 51 - 70 of 70

Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

April 5, 2017
Author(s)
Erkan NMN Senses, Siyam M. Ansar, Christopher L. Kitchens, Yimin NMN Mao, Suresh Narayanan, Bharath NMN Natarajan, Antonio Faraone
Using neutron spin-echo spectroscopy, X-ray photon correlation spectroscopy and bulk rheology, we studied the effect of particle size on the single chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle

Hydrogen Diffusion in Bulk and Nanocrystalline Palladium: A Quasielastic Neutron Scattering Study

August 29, 2016
Author(s)
Maiko Kofu, Naoki Hashimoto, Hiroshi Akiba, Hirokazu Kobayashi, Hiroshi Kitagawa, Hiroshi Kitagawa, Madhu Sudan Tyagi, Antonio Faraone, John R. Copley, Wiebke Lohstroh, Osamu Yamamuro
The diffusion dynamics of hydrogen in bulk and Nanocrystalline palladium has been examined using quasielastic neutron scattering (QENS). With respect to bulk PdH 0.73, two relaxation processes were found. For both processes, the variation of the relaxation

Structure and Dynamics of Interacting Nanoparticles in Semidilute Polymer Solutions

August 17, 2016
Author(s)
Ryan Poling-Skutvik, Katrina Irene S. Mongcopa, Antonio Faraone, Suresh Narayanan, Jacinta C. Conrad, Ramanan Krishnamoorti
We investigate the structure and dynamics of silica nanoparticles and polymer chains in semidilute solutions of high molecular weight polystyrene in 2-butanone to determine the effect of long range interparticle interactions on the coupling between

Dynamic Signature of Molecular Association in Methanol

July 7, 2016
Author(s)
Christopher E. Bertrand, Jeffrey L. Self, John R. Copley, Antonio Faraone
Quasielastic neutron scattering measurements and molecular dynamics simulations were combined to investigate the collective dynamics of deuterated methanol. A slow, non-Fickian mode was observed in addition to the standard heat mode. The qualitative

Kinetic Polymer Arrest in Percolated SWNT Networks

December 3, 2014
Author(s)
Rana NMN Ashkar, Mansour Abdul Baki, Madhu Sudan Tyagi, Antonio Faraone, Paul Butler, Ramanan Krishnamoorti
The inclusion of single-wall carbon nanotubes (SWNT) in a polymer, with interchain distances comparable to the SWNT diameter, can significantly perturb the structural and dynamical properties of interfacial polymeric units. For SWNT concentrations above

Incoherent Quasielastic Neutron Scattering Study of the Relaxation Dynamics in Molybdenum-Oxide Based Keplerate Type Nanocages

June 19, 2014
Author(s)
Antonio Faraone, Emiliano Fratini, Somenath Garai, Achim Muller, Madhu Sudan Tyagi, Timothy Jenkins, Eugene Mamontov, Rick L. Paul, John R. Copley, Piero Baglioni
The single particle relaxation dynamics of hydrogen atoms in different oxomolybdate Keplerate type nanocages characterized by a (metal) 30 icosidodecahedron and a size of {approximately equal}25 A were studied using Incoherent Quasielastic Neutron

Coherent Dynamics of meta-Toluidine Investigated by QuasiElastic Neutron Scattering

March 14, 2012
Author(s)
Antonio Faraone, Kunlun Hong, Larry Kneller, Michael Ohl, John R. Copley
The coherent dynamics of a typical fragil glass former, meta-toluidine, was investigated at the molecular level using QuasiElastic Neutron Scattering, with Time-of-Flight and Neutron Spin Echo spectrometers. It is well known that the static structure

Temperature Dependence of Structure and Density for D 2 O Confined in MCM-41-S

February 15, 2012
Author(s)
William A. Kamitakahara, Antonio Faraone, Kao-Hsiang Liu, Chung-Yuan Mou
Using neutron diffraction, we have tracked the temperature dependence of structural properties for heavy water confined in the nanoporous silica matrix MCM-41-S. By observing the correlation peak corresponding to the pore-pore distance, which is determined

Distinguishing the Monomer to Cluster Phase Transition in Concentrated Lysozyme Solutions by Studying the Temperature Dependence of the Short-Time Dynamics

January 25, 2012
Author(s)
Peter Falus, Lionel Porcar, Emiliano Fratini, Wei-Ren Chen, Antonio Faraone, Kunlun Hong, Piero Baglioni, Yun Liu
Recently experiments that combine both small angle neutron scattering (SANS) and Neutron Spin Echo (NSE) have demonstrated that dynamic clusters can form in concentrated lysozyme solutions when a right combination of a short-ranged attraction and long

Light-Controlled Protein Dynamics Observed with Neutron Spin Echo Measurements

August 2, 2011
Author(s)
Shao-Chun Wang, Panteha Mirarefi, Antonio Faraone, Jr. Lee
A photo-responsive surfactant has been used as a means to control protein structure and dynamics with light illumination. This cationic azobenzene surfactant, azoTAB, which undergoes a reversible photoisomerization upon exposure to the appropriate

Lysozyme Protein Solution with an Intermediate Range Order Structure

November 10, 2009
Author(s)
Yun Liu, Lionel Porcar, Jinhong Chen, Wei-Ren Chen, Peter Falus, Antonio Faraone, Emiliano Fratini, Piero Baglioni
The formation of equilibrium clusters has been studied in both prototypical colloidal system and protein solution. The appearance of a low-Q correlation peak in small angle scattering patterns of lysozyme solution was attributed to the cluster-cluster

A C-S-H Atomic-Scale Computational Toolkit: Application to Service Life Modeling

September 1, 2006
Author(s)
Kenneth A. Snyder, Raymond D. Mountain, Antonio Faraone
A computational toolkit is being developed for studying materials relevant to portland cement hydration. The toolkit will eventually include both a materials database and a collection of computational tools for constructing atomic-scale models, of both
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