A method for volume stabilization of single, dye-doped water microdroplets with femtoliter resolution

Details A method for volume stabilization of single, dye-doped water microdroplets with femtoliter resolution A method for volume stabilization of single, dye-doped water microdroplets with femtoliter resolution

2007-05-18

arxiv.org/abs/0705.2637v1

Physics

Optics

to appear in the J. Op. Soc. Am. B

Scientific paper

10.1364/JOSAB.24.001824

A self-control mechanism that stabilizes the size of Rhodamine B-doped water microdroplets standing on a superhydrophobic surface is demonstrated. The mechanism relies on the interplay between the condensation rate that was kept constant and evaporation rate induced by laser excitation which critically depends on the size of the microdroplets. The radii of individual water microdroplets (>5 um) stayed within a few nanometers during long time periods (up to 455 seconds). By blocking the laser excitation for 500 msec, the stable volume of individual microdroplets was shown to change stepwise.

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