Preparation and properties of superhydrophobic-highly oleophobic SiC membrane

A process was developed to prepare a superhydrophobic-highly oleophobic surface on SiC membrane based on SiO2 particle blending spraying and immersion method. By spraying SiO2 particles of different sizes, a micro-nano dual rough structure with amphiphobic capability was created on the surface of the SiC membrane. Then, perfluorodecyltrimethoxysilane was grafted onto the SiC membrane surface through immersion, successfully achieving a SiC membrane with superhydrophobic-highly oleophobic characteristics and excellent self-cleaning performance. The effects of different parameters, such as fluorine content and surface roughness, on surface wettability were analyzed. The modified superhydrophobic-highly oleophobic SiC membrane exhibited the static water contact angle of 152.6°and the static contact angle of n-hexadecane of 146.3°. The sliding angles were measured to be 5.2°and 10.2°, respectively. These properties could be attributed to the micro-nano structure on the SiC membrane surface and the low surface energy material, which reduced the adhesion between the surface and other substances. The superhydrophobic-highly oleophobic SiC membrane also exhibited stable amphiphobicity in strong acid and alkali solutions. This research provided a simple process for constructing superhydrophobic-highly oleophobic surfaces with excellent acid-base resistance on inorganic membranes. © 2024 Chemical Industry Press Co., Ltd.. All rights reserved.