Liquid elasticity length, universal dynamic crossovers, and glass transition

Trachenko, K. and Brazhkin, V. V. (2008) Liquid elasticity length, universal dynamic crossovers, and glass transition. Journal of Physics: Condensed Matter, 20 (7). 075103. DOI 10.1088/0953-8984/20/7/075103

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Abstract

We discuss two main universal dynamic crossovers in a liquid that correspond to relaxation times of 1 ps and 10−7–10−6 s. We introduce the concept of liquid elasticity length del. At room temperature, del is several Å in water and increases to 0.01 mm in honey and 1 mm in tar. We discuss that on temperature decrease, del = dm and del = L correspond to the two dynamic crossovers, where dm is the medium-range order and L is system size. In this picture, the two important changes in the dynamics of a system are defined by its fundamental lengths. The second crossover defines all kinetic aspects of the glass transition, whereas the 'thermodynamic' glass transition is realized in the limit of infinite system size only. In this picture, we also discuss the division of liquids into strong and fragile. One prediction of our theory is the increase of viscosity with the size of macroscopic system, which we verify by measuring the viscosity of honey.

Item Type:	Article
Uncontrolled Keywords:	2007 AREP IA55 2008 P kot;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Physics: Condensed Matter
Volume:	20
Page Range:	075103
Identification Number:	10.1088/0953-8984/20/7/075103
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:03
Last Modified:	23 Jul 2013 10:08
URI:	http://eprints.esc.cam.ac.uk/id/eprint/745

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