Shape-directed rotation of homogeneous micromotors via catalytic self-electrophoresis

Allan M. Brooks, Mykola Tasinkevych, Syeda Sabrina, Darrell Velegol, Ayusman Sen, Kyle J.M. Bishop

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The pursuit of chemically-powered colloidal machines requires individual components that perform different motions within a common environment. Such motions can be tailored by controlling the shape and/or composition of catalytic microparticles; however, the ability to design particle motions remains limited by incomplete understanding of the relevant propulsion mechanism(s). Here, we demonstrate that platinum microparticles move spontaneously in solutions of hydrogen peroxide and that their motions can be rationally designed by controlling particle shape. Nanofabricated particles with n-fold rotational symmetry rotate steadily with speed and direction specified by the type and extent of shape asymmetry. The observed relationships between particle shape and motion provide evidence for a self-electrophoretic propulsion mechanism, whereby anodic oxidation and cathodic reduction occur at different rates at different locations on the particle surface. We develop a mathematical model that explains how particle shape impacts the relevant electrocatalytic reactions and the resulting electrokinetic flows that drive particle motion.

Original languageEnglish (US)
Article number495
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2019

Fingerprint

micromotors
Micromotors
electrophoresis
Electrophoresis
Propulsion
Anodic oxidation
Platinum
Hydrogen Peroxide
particle motion
microparticles
propulsion
Mathematical models
Chemical analysis
electrokinetics
hydrogen peroxide
mathematical models
platinum
asymmetry
Theoretical Models
oxidation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Brooks, Allan M. ; Tasinkevych, Mykola ; Sabrina, Syeda ; Velegol, Darrell ; Sen, Ayusman ; Bishop, Kyle J.M. / Shape-directed rotation of homogeneous micromotors via catalytic self-electrophoresis. In: Nature communications. 2019 ; Vol. 10, No. 1.
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Shape-directed rotation of homogeneous micromotors via catalytic self-electrophoresis. / Brooks, Allan M.; Tasinkevych, Mykola; Sabrina, Syeda; Velegol, Darrell; Sen, Ayusman; Bishop, Kyle J.M.

In: Nature communications, Vol. 10, No. 1, 495, 01.12.2019.

Research output: Contribution to journalArticle

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