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Controlling the dynamics of colloidal particles by critical Casimir forces

Journal article
Authors Alessandro Magazzu
Agnese Callegari
Juan Pablo Staforelli
Andrea Gambassi
Siegfried Dietrich
Giovanni Volpe
Published in Soft Matter
Volume 15
Pages 2152-2162
ISSN 1744683X
Publication year 2019
Published at Department of Physics (GU)
Pages 2152-2162
Language en
Subject categories Physical Sciences

Abstract

© 2019 The Royal Society of Chemistry. Critical Casimir forces can play an important role for applications in nano-science and nano-technology, owing to their piconewton strength, nanometric action range, fine tunability as a function of temperature, and exquisite dependence on the surface properties of the involved objects. Here, we investigate the effects of critical Casimir forces on the free dynamics of a pair of colloidal particles dispersed in the bulk of a near-critical binary liquid solvent, using blinking optical tweezers. In particular, we measure the time evolution of the distance between the two colloids to determine their relative diffusion and drift velocity. Furthermore, we show how critical Casimir forces change the dynamic properties of this two-colloid system by studying the temperature dependence of the distribution of the so-called first-passage time, i.e., of the time necessary for the particles to reach for the first time a certain separation, starting from an initially assigned one. These data are in good agreement with theoretical results obtained from Monte Carlo simulations and Langevin dynamics.

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Denna text är utskriven från följande webbsida:
http://www.gu.se/english/research/publication/?publicationId=286553
Utskriftsdatum: 2020-02-24