[Soft-matter] Soft Matter and Statistical Physics Seminar on 22 Jan 2021

[Maciej Lisicki]

Dear Soft Matter Colleagues and Friends,

On Friday 22 January 2021 at 9:30 AM we are hosting a seminar during which

Anna Maciołek (MPI for Intelligent Systems, Stuttgart, and ICHF PAN)

will give a talk

Optically heated Janus colloids in a binary liquid mixture: motility and transient coarsening

Abstract
Colloidal particles covered by materials that absorb light receive an increasing attention in various fields of research and in many important applications, for example, bio-medical applications. Such particles become hot under illumination by laser. This gives rise to a variety of curious phenomena, which may be of practical use. For instance, an optically heated colloid suspended in a binary liquid mixture may self-propel or, if trapped by a laser beam, it becomes a microscopic engine.

Using a fluid particle dynamics approach we  investigate a propulsion mechanism for a gold-capped Janus particle as a function of the wettability contrast between capped and uncapped sides of a Janus particle and of a heating power for symmetric and nonsymmetric binary solvent. We also have immobilized this particle in a narrow channel and study nonequilibrium dynamics of a binary solvent around it using experiment and theory. Our results demonstrate that a remarkably complex  time evolution of the concentration field around the colloid is governed by combined effects of temperature gradient and wettability, and crucially depends on whether the colloid is free to move or trapped. Moreover, we discover an important role of transient dynamics for self-propulsion.

The seminar will be conducted on Zoom
https://zoom.us/j/92987083349?pwd=YTZLSFVWUnJzdE4xS1drR3dqMVFDdz09 <https://zoom.us/j/92987083349?pwd=YTZLSFVWUnJzdE4xS1drR3dqMVFDdz09>
and will begin at 9:30AM. 

Maria Ekiel-Jeżewska
Maciej Lisicki
Marek Napiórkowski
Piotr Szymczak
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