Abstract
Nanobubbles are produced on hydrophobic surfaces when they are immersed in aqueoussolutions. The effect of nanobubbles on the immersed surface is of interest in manyapplications. In the study presented here, immersion of the polystyrene film inde-ionized water for several hours produces nanoindents on the film surface. Thetypical diameter of the nanoindents is around 20 nm, and the density is about2.0 × 108 mm−2. The location and formation of nanoindents show strong correlation with the size andlocation of nanobubbles. A mechanism of nanobubble-induced formation of nanoindents isproposed. The influences of film thickness and nanobubble size on the nanoindents are alsodiscussed.
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