Superhydrophobic Surfaces with Very Low Hysteresis Prepared by Aggregation of Silica Nanoparticles During In Situ Urea-Formaldehyde Polymerization
We present a new method for the preparation of superhydrophobic materials by In Situ aggregation of silica nanoparticles on a surface during a urea-formaldehyde (UF) polymerization. This is a onestep process in which a two-tier topography is obtained. The polymerization is carried
out for 30, 60, 120, 180, and 240 min on silicon shards. Silicon surfaces are sintered to remove the polymer. SEM and AFM show both an increase in the area covered by the nanoparticles and their aggregation with increasing polymerization time. Chemical vapor deposition of a fluorinated silane
in the presence of a basic catalyst gives these surfaces hydrophobicity. Deposition of this low surface energy silane is confirmed by the F 1s signal in XPS. The surfaces show advancing water contact angles in excess of 160° with very low hysteresis (<7°) after 120 min and 60 min
polymerization times for 7 nm and 14 nm silica, respectively. Depositions are successfully demonstrated on glass substrates after they are primed with a UF polymer layer.
Document Type: Research Article
Publication date: 01 December 2015
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