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Title: Effect of temperature and pressure on the dynamics of nanoconfined propane

We report the effect of temperature and pressure on the dynamical properties of propane confined in nanoporous silica aerogel studied using quasielastic neutron scattering (QENS). Our results demonstrate that the effect of a change in the pressure dominates over the effect of temperature variation on the dynamics of propane nano-confined in silica aerogel. At low pressures, most of the propane molecules are strongly bound to the pore walls, only a small fraction is mobile. As the pressure is increased, the fraction of mobile molecules increases. A change in the mechanism of motion, from continuous diffusion at low pressures to jump diffusion at higher pressures has also been observed.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Earth Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 S Oval Mall, Columbus, OH 43210 (United States)
  2. Geochemistry and Interfacial Science Group, Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
  3. Jülich Center for Neutron Sciences (JCNS-1), Forschungszentrum Jülich Outstation at Spallation Neutron Source(SNS), Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
  4. Spallation Neutron Source (SNS), Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
Publication Date:
OSTI Identifier:
22269309
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; DIFFUSION; NANOSTRUCTURES; NEUTRON REACTIONS; PROPANE; QUASI-ELASTIC SCATTERING; SILICA