Abstract
For almost all the research of super anti-wetting surfaces, pure liquids like water and n-hexadecane are used as the probes. However, liquids of diverse compositions are used in academic research, industrial production and our daily life. Obviously, the liquid repellency of super anti-wetting coatings is highly dependent on properties of the liquids. Here, we report the first superamphiphobic surface with high repellency towards liquids of extremely high viscosity and low surface tension. The surfaces were prepared by constructing a hierarchical micro-/nanostructure on the Cu micropillar arrays followed by modification with perfluorosilane. The surfaces are superamphiphobic towards the liquids with extremely high viscosity and low surface tension because of (i) the micro-/nanostructured surface composed of micropillars with proper pillar distance and CuO nano-flowers, and (ii) the abundant perfluorodecyl groups on the surface. The contact angles, sliding angles, apparent contact line at the solid-liquid interface and adhesion forces are the end products of micropillar distance, viscosity and surface tension. Smaller micropillar distance, higher viscosity and higher surface tension contribute to reducing the adhesion force. We in situ observed the process of microcapillary bridge rupture for the first time using highly viscous liquids. We also successfully reduced the adhesion forces and enhanced the average rolling velocity of liquids with extremely high viscosity and low surface tension by regulating the micropillar distance.
Highlights
Liquid drops of 20 μL were used for the measurement of contact angles (CAs) and sliding angles (SAs)
Oscillatory measurements showed that the storage modulus (G’) of the liquids is lower than the loss modulus (G”) in the angular frequency of 0.1–100 rad s−1 (Fig. 1d), indicating a viscous response of the liquids[50]
The contact angles, sliding angles, apparent contact line at the solid-liquid interface and adhesion forces of the superamphiphobic surfaces depend on micropillar distance, viscosity and surface tension of the liquids
Summary
Qing Zhu[1], Bucheng Li2, Shangbin Li1, Guan Luo[1], Baohui Zheng1 & Junping Zhang 2. For almost all the research of super anti-wetting surfaces, pure liquids like water and n-hexadecane are used as the probes. We report the first superamphiphobic surface with high repellency towards liquids of extremely high viscosity and low surface tension. Liquids of diverse compositions, e.g., solutions, suspensions and emulsions, are used in academic research, industrial production and our daily life The properties of these liquids including viscosity, surface tension, density and flow form are far different from those of the frequently used pure liquids in the field of super anti-wetting surfaces. The research about super anti-wetting coatings repelling complex liquids, e.g., high viscosity, high solid content and low surface tension, is very rare. We report preparation of superamphiphobic surfaces with high repellency towards liquids of extremely high viscosity and low surface tension. HTPB, a viscous mixture rather than a pure compound, is an oligomer of butadiene, and could react with isocyanates to form polyurethane polymers
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