Dr. José Bico of the Institute of Industrial Physics and Chemistry (ESPCI) in Paris and his colleagues cut geometric shapes a millimeter or so across from thin, rubbery membranes ranging from 40 to 80 microns thick. They then placed a drop of water large enough to reach all corners on top of each shape. As the liquid evaporated, its surface tension tugged the membrane closer around the water's decreasing volume, until the remaining liquid was completely encapsulated inside a sphere, tetrahedron, or some other shape.
This demonstration could lead to improved techniques for constructing microscale or even nanoscale objects by starting with flat pieces that are easy to cut and mass produce.
Read the Focus story and watch the video describing this research.
Abstract of the paper from Physical Review Letters: Phys. Rev. Lett. 98, 156103 (issue of 13 April 2007)
Image credit: Phys. Rev. Lett. 98, 156103 (2007)