Hydrodynamically induced rhythmic motion of optically driven colloidal particles on a ring

Yuriko Sassa, Shuhei Shibata, Yasutaka Iwashita, Yasuyuki Kimura

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We experimentally study the motion of optically driven colloidal particles on a circular path by varying their number N. Although an identical driving force is applied to each particle, their equally spaced configuration is hydrodynamically unstable, and a doublet configuration is spontaneously formed. In small-N systems, the angular difference between neighboring particles exhibits oscillatory or nonoscillatory behavior. The number of oscillatory modes that appear depends on the maximum number of doublets that the system can contain. Frequent switching between different modes was observed with increasing N. The characteristic frequencies of the oscillatory modes are discussed theoretically by linear stability analysis of the equations that govern the motion of hydrodynamically coupled particles. The evaluated frequencies of the slowest modes exhibit reasonably good agreement with those of the mainly observed modes in experiments. The relationship between the characteristic frequencies and specific configurations is confirmed experimentally by setting a specific initial configuration for the particles. An increase in N also enhances the mean angular velocity of the particles owing to the reduced effective viscosity in large-N systems.

Original languageEnglish
Article number061402
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume85
Issue number6
DOIs
Publication statusPublished - Jun 1 2012

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Ring
Motion
rings
Configuration
configurations
Linear Stability Analysis
Angular velocity
Driving Force
angular velocity
Viscosity
Unstable
viscosity
Path
Experiment

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Hydrodynamically induced rhythmic motion of optically driven colloidal particles on a ring. / Sassa, Yuriko; Shibata, Shuhei; Iwashita, Yasutaka; Kimura, Yasuyuki.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 85, No. 6, 061402, 01.06.2012.

Research output: Contribution to journalArticle

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