Smart wetting based on thermal-induced dual-scale surfaces

Abstract

Surfaces wettability influences drag reduction in engineering applications, and surface structure largely determines the wetting properties. This study proposes a novel thermal shape memory polymer (TSMP) with dual-scale structure surface capable of reversible transformation via working temperature. A preparation method for TSMP with micro-nano dual-scale structure is also proposed to enhance hydrophobicity comparing with microstructure. Experimental results indicate TSMP micro-nanostructure surfaces achieve reversible conversion between hydrophilicity and hydrophobicity, TSMPs with micro-nano structure also exhibit good recovery. Simulation was established to understand tunable wettability and fluid flow mechanisms of TSMP reversible two-phase microstructures aiding design of TSMP microstructures with adjustable wettability.