Expanding contracting material to create black dot

I am looking for a material that can easily contract and shrink to create an effect of a black dot with varying diameter using a small heat source. The idea is to get a drop to expand to a specified diameter using electricity. Any other suggestions for achieving the same effect will be welcome. thanks, Oren.

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Oren Elias
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Have you looked at piezoelectric elastomers? They can have enormous deformation from an applied field Here's one link - it's the wrong way round (generator mode) but it's a start.

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Gregg

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Gregg

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