Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 1, Pages 244-248Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201509385
Keywords
contact angle hysteresis; omniphobic surfaces; silanes; sliding angle; surface chemistry
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Funding
- NSF [CMMI-1025020]
- Materials Research Science and Engineering Center at the University of Massachusetts [DMR-0820506]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0820506] Funding Source: National Science Foundation
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Recent strategies to prepare omniphobic surfaces have demonstrated that minimizing 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 degrees) for a broad range of liquids have not been reported. In this work, we 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 acidcatalyzed graft polycondensation of dimethyldimethoxysilane. The smooth, stable, and temperature-resistant coatings show extremely low CAH (< 1 degrees) and low sliding angles for liquids that span surface tensions from 78.2 to 18.4 mNm(-1).
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