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SEM morphologies of ND films with (a) flat, (b) nanopillar, (c) nanocone, and (d) nanowhisker arrays. The insets are optical microscopic images of water droplets contacted on corresponding ND surfaces modified with perfluorosilane.
(Upper images) The corresponding optical microscopic images of water droplets contacted on cBN films with (lower images) (a) flat, (b) nanocone, and (c) nanopillar array surfaces. The cBN films were chemically modified with perfluorosilane.
Water contact angles and sliding angles measured on as deposited ND and cBN films and the resulted nanostructures before and after chemical modification. The solid–liquid contact areas for different nanostructures calculated according to the Cassie mode are also presented.
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