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Issue 25, 2020
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Impurity effects in thermal regelation

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Abstract

When a particle is placed in a material with a lower bulk melting temperature, intermolecular forces can lead to the existence of a “premelted” liquid film of the lower melting temperature material. Despite the system being below the melting temperatures of both solids, the liquid film is a consequence of thermodynamic equilibrium, controlled by intermolecular, ionic and other interactions. An imposed temperature gradient drives the translation of the particle by a process of melting and refreezing known as “thermal regelation”. We calculate the rate of regelation of spherical particles surrounded by premelted films that contain ionic impurities. The impurities enhance the rate of motion thereby influencing the dynamics of single particles and distributions of particles, which we describe in addition to the consequences in natural and technological settings.

Graphical abstract: Impurity effects in thermal regelation

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Article information


Submitted
30 Mar 2020
Accepted
17 May 2020
First published
21 May 2020

This article is Open Access

Soft Matter, 2020,16, 5886-5891
Article type
Paper

Impurity effects in thermal regelation

N. K. Marath and J. S. Wettlaufer, Soft Matter, 2020, 16, 5886 DOI: 10.1039/D0SM00558D

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