Sand-grinding integrated with coatings for preparation of hydrophobic surface based on Miao silver

Water-proofing, anti-corrosion and anti-tarnishing requirement is currently the key to improvement of Miao silver industry. Inspired by superhydrophobic surface (SHS), we managed to use it as a protecting layer to isolate from air, water vapor, liquid electrolyte possibly around with silver ware; meanwhile also give a guide for other mental productions with the same requirement. Considering micro/nanostructure of lotus leaf, water strider's leg, butterfly wings together surface wax substance, especially for butterfly wings' scale-like macrostructure with semi-cylinder-like nanostructure on it, a biomimetic semi-cylinder was theoretically put forward to simulate such composite structure. Followed by it, experimentally using sand-grinding integrated with SiO₂-doped fluorinated modified silane coatings to obtain an SHS with water contact angle (CA) of 162° and CA hysteresis of 4°, micro/nanostructure obtained by coarse/fine sand-grinding in same direction respectively for simulation of butterfly wings' scale structure (macro size) and cylinder structure (nano size); coatings mainly consist of fluorinated modified silane and nano SiO₂ grain from doping; thus structure and coating design having some of independent. Our study emphasizes three aspects below:1.Theoretically, how to simulate micro/nano structure of butterfly wings by modeling based on the natural and artificial SHS, thus a semi-cylinder model was proposed.2.Experimentally, how to prepare such an SHS similar to the butterfly wings' composite structure; thus method of sand-grinding integrated with coatings was configured.3.How to establish the relationship between microstructure and the roughness, solid fraction, contact angle, adhesion work and spreading coefficient based on the already formed composite wetting state.