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Origins of solidification when a simple molecular fluid is confined between two plates

J. Chem. Phys. 115, 1498 (2001); doi:10.1063/1.1380207

Issue Date: 15 July 2001

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A. Levent Demirel
Chemistry Department, Koç University, Rumelifeneri Yolu, Sariyer 80910, Istanbul, Turkey

Steve Granick
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
A simple globular-shaped liquid (octamethylcyclotetrasiloxane, OMCTS) was placed between two rigid mica plates at variable spacings comparable to the size of this molecule and the linear shear viscoelasticity of the confined interfacial film was measured. Strong monotonic increase of the shear relaxation time, elastic modulus, and effective viscosity were observed as the spacing was decreased below about 10 molecular dimensions. The frequency dependence of the viscoelastic spectra measured at different film thicknesses appeared to scale with reduced variables. The data are inconsistent with the abrupt first-order transition, from bulk fluid to solid with decreasing film thickness, whose possibility has been hypothesized, and suggest a glasslike transition instead. ©2001 American Institute of Physics.
History: Received 5 January 2001; accepted 27 April 2001
Permalink: http://link.aip.org/link/?JCPSA6/115/1498/1
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KEYWORDS and PACS

Keywords
PACS
  • 64.70.Dv
    Equations of state, phase equilibria, and phase transitions Specific phase transitions Solid–liquid transitions
  • 83.60.Bc
    Rheology Material behavior Linear viscoelasticity
  • 66.20.+d
    Transport properties of condensed matter (nonelectronic) Viscosity of liquids; diffusive momentum transport
  • YEAR: 2001

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PUBLICATION DATA

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