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Issue 10, 2019
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Controlling the dynamics of colloidal particles by critical Casimir forces

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Abstract

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.

Graphical abstract: Controlling the dynamics of colloidal particles by critical Casimir forces

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Publication details

The article was received on 05 Jul 2018, accepted on 10 Jan 2019 and first published on 23 Jan 2019


Article type: Paper
DOI: 10.1039/C8SM01376D
Citation: Soft Matter, 2019,15, 2152-2162
  • Open access: Creative Commons BY license
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    Controlling the dynamics of colloidal particles by critical Casimir forces

    A. Magazzù, A. Callegari, J. P. Staforelli, A. Gambassi, S. Dietrich and G. Volpe, Soft Matter, 2019, 15, 2152
    DOI: 10.1039/C8SM01376D

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