Aging effects on thermal conductivity of glass-forming liquids

Bhuyan, PJ and Mandal, R and Chaudhuri, P and Dhar, A and Dasgupta, C (2020) Aging effects on thermal conductivity of glass-forming liquids. In: Physical Review E, 101 (2).

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Abstract

Thermal conductivity of a model glass-forming system in the liquid and glass states is studied using extensive numerical simulations. We show that near the glass transition temperature, where the structural relaxation time becomes very long, the measured thermal conductivity decreases with increasing age. Second, the thermal conductivity of the disordered solid obtained at low temperatures is found to depend on the cooling rate with which it was prepared. For the cooling rates accessible in simulations, lower cooling rates lead to lower thermal conductivity. Our analysis links this decrease of the thermal conductivity with increased exploration of lower-energy inherent structures of the underlying potential energy landscape. Further, we show that the lowering of conductivity for lower-energy inherent structures is related to the high-frequency harmonic modes associated with the inherent structure being less extended. Possible effects of considering relatively small systems and fast cooling rates in the simulations are discussed.

Item Type:	Journal Article
Publication:	Physical Review E
Publisher:	American Physical Society
Additional Information:	The copyright of this article belongs to American Physical Society
Keywords:	Cooling; Cooling systems; Glass; Glass transition; Liquids; Potential energy, Cooling rates; Disordered solids; Glass-forming liquid; High-frequency harmonics; Low temperatures; Lower energies; Potential energy landscapes; Small systems, Thermal conductivity of solids
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Jun 2020 11:14
Last Modified:	16 Jun 2020 11:14
URI:	http://eprints.iisc.ac.in/id/eprint/64823

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