Effect of Morphology Evolution on the Anticorrosion Performance of Superhydrophobic Surfaces and Lubricant-Infused Surfaces

The properties of three kinds of superhydrophobic surfaces (SHSs) and three kinds of superslippery liquid-infused surfaces (SLIPSs) composed of microspheres with different morphologies (solid spheres, bayberry-like hollow spheres, and urchin-like hollow spheres) were studied in this paper. The results show that, in all the superhydrophobic surface samples, the superhydrophobic surfaces with a multilayer structure have outstanding advantages in all aspects of performance over that with a single structure. It is likely due to the multistage structure combining the pressure dissipation of the microstructure and the high capillary pressure of the nanostructure, further reducing the contact angle hysteresis and improving the pressure resistance resulting in an improvement in the surface properties. We also show that SLIPSs with the urchin-like microspheres (U-SLIIPS) provide a superior performance relative to the other two kinds of SLIPSs. The unique inner hollow part of the urchin-like structure provides a good environment for storing lubricating fluids. The spherical outer shell with nanotubes can facilitate better capillary output and minimize lubricant loss. The U-SLIPS has the best shear resistance, lowest contact angle hysteresis, and best corrosion resistance and other properties among all the samples.