Abstract
Superwetting surfaces have received increasing attention because of their rich practical applications. Although various superwettabilities are independently achieved, the relationship between those superwettabilities is still not well-clarified. In this mini-review, we show that superhydrophilicity, underwater superoleophilicity, underwater superaerophilicity, superhydrophobicity, underwater superoleophobicity, and underwater superaerophobicity can be obtained on a same structured surface by the combination of hierarchical surface microstructures and proper chemistry. The relationship and interconversion between the above-mentioned different superwettabilities are also well-discussed. We believe that the current discussion and clarification of the relationship and interconversion between different superwettabilities has important significance in the design, fabrication, and applications of various superwetting materials.
Highlights
As three common states of matter, solid, liquid, and gas form different kinds of solid/liquid/gas interfaces
Taking the hydrophilic Al substrate and the hydrophobic polydimethylsiloxane (PDMS) substrate as the examples, we show that various kinds of superwettabilities can be obtained on the same structured surface
The superhydrophilicity and superhydrophobicity of a structured surface can be transformed from one state to another state by simple hydrophobic or hydrophilic modification
Summary
As three common states of matter, solid, liquid, and gas form different kinds of solid/liquid/gas interfaces. Oil droplet, or gas bubble on the material surfaces with superhydrophilicity, superoleophilicity, or superaerophilicity has a contact angle (CA)
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