Manipulation of Liquid
Filaments on Photoresponsive
Microwrinkles
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Abstract
Microwrinkle grooves serve as open microchannel capillaries,
where
the capillary action depends on the wettability of a liquid on the
groove surface. Here, we report the photoinduced capillary action
of a liquid in such microwrinkle grooves. The wettability is changed
through the irradiation of a photoresponsive microwrinkle surface.
By utilizing micropattern light-projection apparatus, we prepare liquid
filaments that fill only the microgrooves prescribed by the patterned
light, with micrometer-scale spatial resolution. This new technology
enables the precise spatial control of liquids on a solid surface,
and thus, is applicable in the fields of micropatterning and open-channel
microfluidics