Geometric asymmetry driven Janus micromotors

Guanjia Zhao, Martin Pumera

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The production and application of nano-/micromotors is of great importance. In order for the motors to work, asymmetry in their chemical composition or physical geometry must be present if no external asymmetric field is applied. In this paper, we present a "coconut" micromotor made of platinum through the partial or complete etching of the silica templates. It was shown that although both the inner and outer surfaces are made of the same material (Pt), motion of the structure can be observed as the convex surface is capable of generating oxygen bubbles. This finding shows that not only the chemical asymmetry of the micromotor, but also its geometric asymmetry can lead to fast propulsion of the motor. Moreover, a considerably higher velocity can be seen for partially etched coconut structures than the velocities of Janus or fully etched, shell-like motors. These findings will have great importance on the design of future micromotors.

Original languageEnglish
Pages (from-to)11177-11180
Number of pages4
Issue number19
Publication statusPublished - 2014 Oct 7

Bibliographical note

Publisher Copyright:
© the Partner Organisations 2014.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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