Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling

Ryabov, A and Tasinkevych, M ORCID: https://orcid.org/0000-0001-6689-1844, 2022. Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling. Journal of Chemical Physics, 157 (10): 104108. ISSN 0021-9606

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Abstract

Catalytically active macromolecules are envisioned as key building blocks in development of artificial nanomotors. However, theory and experiments report conflicting findings regarding their dynamics. The lack of consensus is mostly caused by a limited understanding of specifics of self-propulsion mechanisms at the nanoscale. Here, we study a generic model of a self-propelled nanoparticle that does not rely on a particular mechanism. Instead, its main assumption is the fundamental symmetry of microscopic dynamics of chemical reactions: the principle of microscopic reversibility. Significant consequences of this assumption arise if we subject the particle to an action of an external time-periodic force. The particle diffusion coefficient is then enhanced compared to the unbiased dynamics. The enhancement can be controlled by the force amplitude and frequency. We also derive the power spectrum of particle trajectories. Among new effects stemming from the microscopic reversibility are the enhancement of the spectrum at all frequencies and sigmoid-shaped transitions and a peak at characteristic frequencies of rotational diffusion and external forcing. The microscopic reversibility is a generic property of a broad class of chemical reactions, therefore we expect that the presented results will motivate new experimental studies aimed at testing of our predictions. This could provide new insights into dynamics of catalytic macromolecules.

Item Type:	Journal article
Publication Title:	Journal of Chemical Physics
Creators:	Ryabov, A. and Tasinkevych, M.
Publisher:	AIP Publishing
Date:	14 September 2022
Volume:	157
Number:	10
ISSN:	0021-9606
Identifiers:	Number Type 10.1063/5.0101520 DOI 1565863 Other
Rights:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Ryabov, A., & Tasinkevych, M. (2022). Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling. Journal of Chemical Physics, 157(10), 104108 and may be found at https://doi.org/10.1063/5.0101520
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	27 Jan 2023 16:18
Last Modified:	27 Jan 2023 16:18
URI:	https://irep.ntu.ac.uk/id/eprint/48102

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