文章基本信息

标题：Adam-Gibbs model in the density scaling regime and its implications for the configurational entropy scaling
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作者：Elżbieta Masiewicz ; Andrzej Grzybowski ; Katarzyna Grzybowska 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep13998
出版社：Springer Nature
摘要：To solve a long-standing problem of condensed matter physics with determining a proper description of the thermodynamic evolution of the time scale of molecular dynamics near the glass transition, we have extended the well-known Adam-Gibbs model to describe the temperature-volume dependence of structural relaxation times, τ _α( T , V ). We also employ the thermodynamic scaling idea reflected in the density scaling power law, τ _α = f ( T ⁻¹ V ^{− γ}), recently acknowledged as a valid unifying concept in the glass transition physics, to differentiate between physically relevant and irrelevant attempts at formulating the temperature-volume representations of the Adam-Gibbs model. As a consequence, we determine a straightforward relation between the structural relaxation time τ _α and the configurational entropy S _C, giving evidence that also S _C( T , V ) = g ( T ⁻¹ V ^{− γ}) with the exponent γ that enables to scale τ _α( T , V ). This important findings have meaningful implications for the connection between thermodynamics and molecular dynamics near the glass transition, because it implies that τ _α can be scaled with S _C.