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Numerical evidence for thermally induced monopoles

Wirnsberger, P; Fijan, D; Lightwood, RA; Saric, A; Dellago, C; Frenkel, D; (2017) Numerical evidence for thermally induced monopoles. Proceedings of the National Academy of Sciences , 114 (19) pp. 4911-4914. 10.1073/pnas.1621494114. Green open access

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Abstract

Electric charges are conserved. The same would be expected to hold for magnetic charges, yet magnetic monopoles have never been observed. It is therefore surprising that the laws of nonequilibrium thermodynamics, combined with Maxwell’s equations, suggest that colloidal particles heated or cooled in certain polar or paramagnetic solvents may behave as if they carry an electric/magnetic charge. Here, we present numerical simulations that show that the field distribution around a pair of such heated/cooled colloidal particles agrees quantitatively with the theoretical predictions for a pair of oppositely charged electric or magnetic monopoles. However, in other respects, the nonequilibrium colloidal particles do not behave as monopoles: They cannot be moved by a homogeneous applied field. The numerical evidence for the monopole-like fields around heated/cooled colloidal particles is crucial because the experimental and numerical determination of forces between such colloidal particles would be complicated by the presence of other effects, such as thermophoresis.

Type: Article
Title: Numerical evidence for thermally induced monopoles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1073/pnas.1621494114
Publisher version: http://doi.org/10.1073/pnas.1621494114
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: soft matter, molecular simulation, colloids, monopoles, nonequilibrium thermodynamics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10071900
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