Understanding enhanced rotational dynamics of active probes in rod suspensions

Abstract

Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.

Graphical abstract: Understanding enhanced rotational dynamics of active probes in rod suspensions

Supplementary files

Article information

Article type
Paper
Submitted
06 May 2022
Accepted
20 Jul 2022
First published
05 Aug 2022
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2022, Advance Article

Understanding enhanced rotational dynamics of active probes in rod suspensions

N. Narinder, M. F. Bos, C. Abaurrea-Velasco, J. de Graaf and C. Bechinger, Soft Matter, 2022, Advance Article , DOI: 10.1039/D2SM00583B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements