Orbits, Spirals, and Trapped States: Dynamics of a Phoretic Janus Particle in a Radial Concentration Gradient DOI
Parvin Bayati, Stewart A. Mallory

ACS Nano, Journal Year: 2024, Volume and Issue: 18(34), P. 23047 - 23057

Published: Aug. 13, 2024

A long-standing goal in colloidal active matter is to understand how gradients fuel concentration influence the motion of phoretic Janus particles. Here, we present a theoretical description spherical particle presence radial gradient chemical solute driving self-propulsion. Radial are geometry relevant many scenarios systems and naturally arise due point source or sink fuel. We derive an analytical solution for particle's velocity quantify on trajectory. Compared linear concentration, uncover much richer set dynamic behaviors including circular orbits trapped stationary states. identify ratio mobilities between two domains as central quantity tuning their dynamics. Our results provide path developing optimum protocols dynamics particles mixing fluid at microscale. In addition, this work suggests method quantifying surface properties particles, which have proven be challenging probe experimentally.

Language: Английский

Effect of Janus balance on the thermal conductivity of nanofluid DOI
Takahiro Ikeda, Yusei Kobayashi, Masashi Yamakawa

et al.

Chemical Physics Letters, Journal Year: 2025, Volume and Issue: unknown, P. 141969 - 141969

Published: Feb. 1, 2025

Language: Английский

Citations

0
Single-file diffusion of active Brownian particles DOI

Abosede Adeola Akintunde,

Parvin Bayati, Hyeongjoo Row

et al.

The Journal of Chemical Physics, Journal Year: 2025, Volume and Issue: 162(16)

Published: April 22, 2025

Single-file diffusion (SFD) is a key mechanism underlying transport phenomena in confined physical and biological systems. In typical SFD process, microscopic particles are restricted to moving narrow channel where they cannot pass one another, resulting constrained motion anomalous long-time diffusion. this study, we use Brownian dynamics simulations analytical theory investigate the of athermal active (ABPs)—a minimal model colloids. Building on prior work [Schiltz-Rouse et al., Phys. Rev. E 108, 064601 (2023)], kinetic temperature, pressure, compressibility single-file ABP system were derived, develop an accurate expression for mean square displacement (MSD) tagged particle. We find that MSD exhibits ballistic behavior at short times, governed by reduced temperature system. At long characteristic subdiffusive scaling SFD, [⟨(Δx)2⟩∼ t1/2], preserved. However, self-propulsion introduces significant changes 1D-mobility, which directly relate system’s compressibility. Furthermore, demonstrate generalized originally proposed Kollmann equilibrium systems [M. Kollmann, Lett. 90, 180602 (2003)], can be extended with modification. These findings provide framework understanding particle tuning properties microscale, particularly geometries highly restricted.

Language: Английский

Citations

0
Orbits, Spirals, and Trapped States: Dynamics of a Phoretic Janus Particle in a Radial Concentration Gradient DOI
Parvin Bayati, Stewart A. Mallory

ACS Nano, Journal Year: 2024, Volume and Issue: 18(34), P. 23047 - 23057

Published: Aug. 13, 2024

A long-standing goal in colloidal active matter is to understand how gradients fuel concentration influence the motion of phoretic Janus particles. Here, we present a theoretical description spherical particle presence radial gradient chemical solute driving self-propulsion. Radial are geometry relevant many scenarios systems and naturally arise due point source or sink fuel. We derive an analytical solution for particle's velocity quantify on trajectory. Compared linear concentration, uncover much richer set dynamic behaviors including circular orbits trapped stationary states. identify ratio mobilities between two domains as central quantity tuning their dynamics. Our results provide path developing optimum protocols dynamics particles mixing fluid at microscale. In addition, this work suggests method quantifying surface properties particles, which have proven be challenging probe experimentally.

Language: Английский

Citations

3