Active motion of a Janus particle by self-thermophoresis in a defocused laser beam

Hong Ren Jiang, Natsuhiko Yoshinaga, Masaki Sano

Research output: Contribution to journalArticlepeer-review

538 Citations (Scopus)

Abstract

We study self-propulsion of a half-metal coated colloidal particle under laser irradiation. The motion is caused by self-thermophoresis: i.e., absorption of a laser at the metal-coated side of the particle creates local temperature gradient which in turn drives the particle by thermophoresis. To clarify the mechanism, temperature distribution and a thermal slip flow field around a microscale Janus particle are measured for the first time. With measured temperature drop across the particle, the speed of self-propulsion is corroborated with the prediction based on accessible parameters. As an application for driving a micromachine, a microrotor is demonstrated.

Original languageEnglish
Article number268302
JournalPhysical review letters
Volume105
Issue number26
DOIs
Publication statusPublished - 2010 Dec 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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