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Quasielastic neutron scattering investigation of motion of water molecules in n-propyl alcohol-water mixture

J. Chem. Phys. 130, 074503 (2009); doi:10.1063/1.3073881

Published 19 February 2009

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Masaru Nakada,1 Kenji Maruyama,2 Osamu Yamamuro,3 and Masakatsu Misawa4
1Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
2Faculty of Science, Niigata University, Niigata 950-2181, Japan
3Neutron Scattering Laboratory, Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
4High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
The dynamics of water molecules in the n-propyl alcohol-water mixtures is investigated by using quasielastic neutron scattering measurements. The dynamic structure factor S(Q,E) obtained from incoherent scattering of hydrogen atoms of water is fitted with jump diffusion and relaxing cage models. The diffusion constant obtained from the relaxing cage model, which gives better fitting with S(Q,E), shows better agreement to the experimental value than that of jump diffusion model. The dependence of translational relaxation time tauT(Q) and stretched exponent betaT(Q) on the fraction of hydrophobic hydrating water molecules in the solution is discussed. ©2009 American Institute of Physics
History: Received 30 April 2008; accepted 31 December 2008; published 19 February 2009
Permalink: http://link.aip.org/link/?JCPSA6/130/074503/1
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KEYWORDS and PACS

Keywords
PACS
  • 66.10.C-
    Diffusion and thermal diffusion in liquids
  • 61.25.Em
    Structure of molecular liquids
  • YEAR: 2009

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ISSN:
0021-9606 (print)   1089-7690 (online)
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