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Issue 40, 2014
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Light controlled friction at a liquid crystal polymer coating with switchable patterning

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Abstract

We describe a new methodology that enables dynamical control of motion through modulating the friction at coating surfaces by exposing to UV light. The principle is based on reversible switching of the surface topographies of the coating by light. The coating surface transfers from flat in the dark to corrugated in the presence of UV by forming regular ridge-like line gratings. Both the static and the kinetic friction coefficient are investigated in a dynamic manner by switching between the off (flat surface) and the activated (with ridges) state. By dynamically changing the friction, we are able to bring the sample from a static state into motion via UV exposure. When in motion, the friction coefficient can be altered further by modulating the light conditions. For example, a smooth sliding can transfer into an interlocking state, or vice versa. Moreover, we can dynamically reduce the contact area in the interface and thus lowering friction forces.

Graphical abstract: Light controlled friction at a liquid crystal polymer coating with switchable patterning

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Article information


Submitted
10 Jun 2014
Accepted
05 Aug 2014
First published
05 Aug 2014

Soft Matter, 2014,10, 7952-7958
Article type
Paper
Author version available

Light controlled friction at a liquid crystal polymer coating with switchable patterning

D. Liu and D. J. Broer, Soft Matter, 2014, 10, 7952
DOI: 10.1039/C4SM01249F

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