Probing microscopic wetting properties of superhydrophobic surfaces by vibrated micrometer-sized droplets.

Abstract

We determine contact angles of micrometer-sized NaCl-water droplets on superhydrophobic surfaces by analyzing their lowest-order axisymmetric vibrational resonances driven by vertical oscillations of the surface. Fluorescence spectra of the dye-doped droplets excited by laser light feature whispering-gallery modes (WGMs) whose spectral widths depend on the… (More)
DOI: 10.1021/la1049925

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