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Title: Neutron spin-echo studies on dynamic and static fluctuations in two types of poly(vinyl alcohol) gels

We report neutron spin-echo measurements on two types of poly(vinyl alcohol) (PVA) gels. The first is PVA gel in a mixture of dimethyl sulfoxide (DMSO) and water with volume ratio 60/40, and the second is PVA gel in an aqueous borax solution. The observed normalized intermediate scattering functions I(Q,t)/I(Q,0) are very different between them. The former I(Q,t)/I(Q,0) shows a nondecaying component in addition to a fast decay, but the latter does not have the nondecaying one. This clearly indicates that the fluctuations in the former PVA gel consist of static and dynamic fluctuations whereas the latter PVA gel does include only the dynamic fluctuations. The dynamic fluctuations of the former and latter gels have been analyzed in terms of a restricted motion in the network and Zimm motion, respectively, and the origins of these motions will be discussed.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011 (Japan)
  2. Department of Physics, Faculty of Science, Kyoto University, Kyoto, 606-5802 (Japan)
  3. Institute for Solid State Physics, The University of Tokyo, 106-1 Shirakata, Tokai, Ibaraki-ken 319-1106 (Japan)
  4. Faculty of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima-ken 192-0397 (Japan)
Publication Date:
OSTI Identifier:
20641341
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; Journal Volume: 71; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevE.71.011801; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AQUEOUS SOLUTIONS; BORAX; DMSO; FLUCTUATIONS; FUNCTIONS; GELS; NEUTRONS; PVA; SCATTERING; SPIN ECHO; WATER