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Issue 13, 2017
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Optothermally driven colloidal transport in a confined nematic liquid crystal

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Abstract

We demonstrate transport of microparticles by rapid movement of a laser spot in a thin layer of a nematic liquid crystal. The transport is achieved by fluid flow, caused by two different mechanisms. The thermoviscous expansion effect induces colloidal transport in the direction opposite to the laser movement, whereas thermally induced local melting of the liquid crystal pulls the particles in the direction of the laser movement. We demonstrate control of colloidal transport by changing the speed of the laser trap movement and the laser power. We anticipate that complex optofluidic colloidal transport could be realized in the nematic liquid crystal using a channel-free optofluidic approach.

Graphical abstract: Optothermally driven colloidal transport in a confined nematic liquid crystal

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Publication details

The article was received on 19 Jan 2017, accepted on 02 Mar 2017 and first published on 02 Mar 2017


Article type: Paper
DOI: 10.1039/C7SM00136C
Citation: Soft Matter, 2017,13, 2448-2452
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    Optothermally driven colloidal transport in a confined nematic liquid crystal

    M. Škarabot, N. Osterman and I. Muševič, Soft Matter, 2017, 13, 2448
    DOI: 10.1039/C7SM00136C

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