Role of Interfacial Entropy in the Particle-Size Dependence of Thermophoretic Mobility

A. Arango-Restrepo and J. M. Rubi
Phys. Rev. Lett. 125, 045901 – Published 24 July 2020

Abstract

We show that changes in the surface tension of a particle due to the presence of nonionic surfactants and impurities, which alter the interfacial entropy, have an impact on the value of the thermophoretic mobility. We have found the existence of different behaviors of this quantity in terms of particle size which can be summarized through a power law. For particles that are small enough, the thermophoretic mobility is a constant, whereas for larger particles it is linear in the particle radius. These results show the important role of the interfacial entropic effects on the behavior of the thermophoretic mobility.

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  • Received 7 May 2019
  • Accepted 5 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.045901

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsStatistical Physics & Thermodynamics

Authors & Affiliations

A. Arango-Restrepo*,† and J. M. Rubi

  • Departament de Física de la Matéria Condensada, Facultat de Física, Universitat de Barcelona, Avinguda Diagonal 647, 08028 Barcelona, Spain

  • *aarangor@unal.edu.co/aarangor@ub.edu
  • Also at Institut de nanociencia i nanotecnologia, Universitat de Barcelona, 08028 Barcelona, Spain.
  • Also at PoreLab, Department of Physics, Norwegian University of Science and Technology, NTNU, 7491 Trondheim, Norway.

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Issue

Vol. 125, Iss. 4 — 24 July 2020

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