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Phototaxis of active colloid by self-thermophoresis


Phototaxis usually refers to the ability of an motile micoorganism to move directionally within a light gradient, which is important for the microorganism to gain energy or avoid damage. Here, we show that an active Janus particle driven by self-thermophoresis from light heating is able to exhibit a significant phototactic motion by means of mesoscale dynamics simulation. Depending on the particle-fluid interactions, the active particle can move along or against the light gradient, corresponding to the positive or negative phototaxis, respectively. We find that the phototaxis of the active colloid is determined by various mechanisms, including alignment (polarization) of the particle to the light gradient, orientation-dependent motility and spatially inhomogeneous motility. Our results shed light on the phototactic behavior of the artificial active colloids and open up new possibility to design photo-responsive micromachines.

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Publication details

The article was received on 12 Sep 2018, accepted on 30 Nov 2018 and first published on 03 Dec 2018

Article type: Paper
DOI: 10.1039/C8SM01871E
Citation: Soft Matter, 2018, Accepted Manuscript
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    Phototaxis of active colloid by self-thermophoresis

    N. Yu, X. Lou, K. Chen and M. Yang, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM01871E

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