Low-frequency elastic behavior of a supercooled liquid

被引：28
|
作者：
Chushkin, Y. [1 ]
Caronna, C. [1 ,2 ]
Madsen, A. [1 ]
机构：
[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[2] Dept Phys & Astron Sci, I-90123 Palermo, Italy
来源：
EPL | 2008年 / 83卷 / 03期
关键词：
D O I：
10.1209/0295-5075/83/36001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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. Copyright (C) EPLA, 2008.
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