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Friday, 20 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Instant omniphobic surfaces with unprecedented repellency

Monday, 30 November 2015

American researchers report a simple and straightforward method to prepare omniphobic surfaces that they believe to be as good or better than reported methods.

The prepared coatings are smooth, stable and temperature-resistant. Source: Rainer Sturm/pixelio.de

The prepared coatings are smooth, stable and temperature-resistant. Source: Rainer Sturm/pixelio.de

Recent strategies to prepare "omniphobic” surfaces have demonstrated that minimising contact angle hysteresis (CAH) is the key criterion for effectiveness. CAH is affected by chemistry and topography defects at the molecular and higher levels, thus most surfaces exhibit significant CAH. Preparative methods for stable coatings on smooth substrates with negligible CAH (<2°) for a broad range of liquids have not been reported.

Smooth, stable, temperature-resistant

In this work, researchers describe a simple and rapid procedure to prepare omniphobic surfaces that are stable under pressure and durable at elevated temperatures. Consistent with theory, they exhibit sliding angles that decrease with liquid surface tension. Slippery omniphobic covalently attached liquid (SOCAL) surfaces are obtained through acid-catalysed graft polycondensation of dimethyldimethoxysilane. The smooth, stable and temperature-resistant coatings show extremely low CAH (≤1°) and low sliding angles for liquids that span surface tensions from 78.2 to 18.4 mN m−1.

The study is published in: Angewandte Chemie.

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