Phys. Rev. Lett. 103, 175701 (2009) [4 pages]
Structural Signal of a Dynamic Glass Transition
Abstract
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Sudeshna Chattopadhyay, 1 Ahmet Uysal, 1 Benjamin Stripe, 1 Guennadi Evmenenko, 1 Steven Ehrlich, 2 Evguenia A. Karapetrova, 3 and Pulak Dutta11Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
2National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA
3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
Received 14 August 2009; revised 11 September 2009; published 22 October 2009
Pentaphenyl trimethyl trisiloxane is an isotropic liquid at room temperature with a dynamic glass transition at 224 K. Using x-ray reflectivity, we see surface density oscillations (layers) develop below 285 K, similar to those seen in other metallic and dielectric liquids and in computer simulations. The layering threshold is ~0.23 times the liquid-gas critical temperature. Upon cooling further, there is a sharp increase at 224 K in the persistence of the surface layers into the bulk material, i.e., an apparently discontinuous change in static structure at the glass transition.
©2009 The American Physical Society
| URL: |
http://link.aps.org/doi/10.1103/PhysRevLett.103.175701
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| DOI: |
10.1103/PhysRevLett.103.175701 |
| PACS: |
64.70.kj;
68.03.Hj
|
REFERENCES (27)
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