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Controllable wettability has been achieved in inverse opal, fabricated with a photoresponsive azobenzene monolayer. The surface undergoes reversible changes in wettability on UV/Vis irradiation due to photoisomerization of the monolayer. Adjustment of the air-sphere size of the inverse opal controls both structural color and contact angle (CA) [picture shows SEM image of modified inverse opal and water droplet shapes in the trans (CA=140.8°) and cis states (CA=121.8°)].
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Ge et al. (2006) studied this question.
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