Naslov
Spontaneous adsorption-induced Salvinia-like micropillars with high adhesion

Autori
Shi, Zhen ; Zhang, Zejun ; Huang, Wei ; Zeng, Hang ; Mandić, Vilko ; Hu, Xin ; Zhao, Lizhong ; Zhang, Xuefeng

Izvornik
Langmuir (0743-7463) 37 (2021), 22; 6728-6735

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
micropillars ; superhydrofobicity ; cerium oxide ; magnetron sputtering

Sažetak
Superhydrophobic surfaces with high adhesion provide high potential for underwater applications. Inspired by Salvinia leaf, here, we have reported a simple method for fabricating adhesive Salvinia-like micropillars via photolithography and spontaneous adsorption of organic molecules from the atmosphere. With continuous hydrocarbon adsorption on sputtered cerium dioxide (CeO2) films, the surface gradually evolved and eventually became chemically heterogeneous. Huge wetting contrast from superhydrophilic to superhydrophobic over exposure time was observed ; meanwhile, the wetting mode changed from the Wenzel (W) state to Cassie- Baxter (C-B) state. As a result, hydrophobic hydrocarbons (C−C/C−H) and trapped air between adjacent pillars contributed to the high apparent contact angle (CA), while the hydrophilic domains of C−O/OC−O and CeO2 on the top layer made the surface highly adhesive with water droplets. In comparison with traditional fluorinated superhydrophobic surfaces, CeO2-coated surfaces showed high adhesive force with water droplets and can be used as a “mechanical hand” for water droplet transport. The adsorption-induced Salvinia-like micropillars with high adhesion may find many other droplet-based applications in microfluidic fields.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Interdisciplinarne tehničke znanosti

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