Volume 83, Number 3, August 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||16 July 2008|
Low-frequency elastic behavior of a supercooled liquid
European Synchrotron Radiation Facility - B.P. 220, F-38043 Grenoble, France
2 Department of Physical and Astronomical Sciences - via Archirafi 36, I-90123, Palermo, Italy
Accepted: 10 June 2008
By X-ray photon correlation spectroscopy we quantify the influence of elasticity and viscosity on the capillary wave (CW) surface dynamics of a supercooled liquid. To fit the data a novel model combining Maxwell-Debye and Voigt-Kelvin viscoelasticity is derived yielding a saturation of relaxation rates at high q as well as an offset in the CW dispersion relation. Diffuse X-ray scattering confirms the result and data taken on the surface of supercooled polypropylene glycol (PPG-4000) evidence a low-frequency elastic plateau of the storage modulus. A possible connection between the observed solid-like response and the supercooled state is discussed.
PACS: 64.70.pm – Liquids / 61.05.cf – X-ray scattering (including small-angle scattering) / 68.03.Kn – Dynamics (capillary waves)
© EPLA, 2008
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