The European Physical Journal Special Topics

, Volume 141, Issue 1, pp 53–56 | Cite as

Does confined water exhibit a fragile-to-strong transition?

  • J. Hedström
  • J. Swenson
  • R. Bergman
  • H. Jansson
  • S. Kittaka
Article

Abstract.

The dynamics of supercooled confined water has recently been shown to have a pronounced, apparent fragile-to-strong transition (FST). Here we use broadband dielectric spectroscopy (10-2–109 Hz) to study the dynamics of water confined in silica matrices MCM-41 C10 and C18, with pore diameter of 21.4 and 36.1 Å, respectively. The local dynamics of water molecules and the dynamics of the hydroxyl groups on the inner wall of the pores are followed up to over 240 K. We argue that the reported FST for confined water is due to the vanishing of the cooperative α relaxation, which implies that it should not be interpreted as a true FST.

Keywords

European Physical Journal Special Topic Hydration Level Dielectric Data Supercooled Water Nanoporous Silica 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • J. Hedström
    • 1
  • J. Swenson
    • 1
  • R. Bergman
    • 1
  • H. Jansson
    • 1
  • S. Kittaka
    • 2
  1. 1.Department of Applied PhysicsChalmers University of TechnologyGöteborgSweden
  2. 2.Department of ChemistryFaculty of Science, Okayama University of ScienceOkayamaJapan

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