Abstract
Although superomniphobic surfaces have attracted extensive interest owing to many important applications, successful fabrication of such surfaces still remains a critical challenge. Herein, we present a flexible transparent superomniphobic polydimethylsiloxane (PDMS) surface with a micropillar array using Si nanowires as the mould. The as-obtained PDMS not only exhibits excellent liquid-repellent performance with a static contact angle of over 150° and sliding angle of less than 6° against a wide range of liquids, but also maintains the super-repellency even under acid/base corrosion, mechanical damage, and unidirectional stretching.
Highlights
Superomniphobic surfaces that can repel a wide range of liquids with high contact angle and low sliding angle have received increasing attention as they have versatile applications, including antibiofouling,[1,2] liquid transportation,[3,4] drag resistance reduction[5,6] and self-cleaning surfaces,[7,8,9,10] etc
Contact angle (CA) and contact angle hysteresis were determined with a contact angle analyzer (TBU 95, DataPhysics Instruments GmbH, Germany). 3 mL of liquid droplet was dropped onto the PDMS micropillar surface to con rm its liquid repellency
The Si nanowires (SiNW) structures and PDMS replica are fabricated as shown in Scheme 1
Summary
Superomniphobic surfaces that can repel a wide range of liquids with high contact angle and low sliding angle have received increasing attention as they have versatile applications, including antibiofouling,[1,2] liquid transportation,[3,4] drag resistance reduction[5,6] and self-cleaning surfaces,[7,8,9,10] etc Building such surfaces usually requires the combination of micronanostructured hierarchical surfaces and the subsequent treatment of low surface energy chemicals[11] The chemical treatment can be implemented by per uorocarbon materials onto structured surfaces, including vapor deposition[12,13,14,15] and dip-coating.[7,8,16,17,18] To make hierarchical micro/nano structures, methods such as stacking micro and nanospheres,[9,16] texturing bers,[17] and spray coating,[7,12,18,19] have been commonly used while fabrication of such surfaces with special surface topography such as nanopatterned micropillars, usually involves photolithography or reactive ion-etching using sophisticated tools with complex preparation process.[13,14,15,19,20,21,22,23,24]. Our work simpli es the preparation process without sophisticated instruments for photolithography or reactive ion etching
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