Spreading of Impacting Water Droplet on Surface with Fixed Microstructure and Different Wetting from Superhydrophilicity to Superhydrophobicity

The spreading of the water droplets falling on surfaces with a contact angle from 0 to 160° was investigated in this work. Superhydrophilicity surface is achieved by laser treatment, and hydrophobization then applying fluoropolymer coating different thicknesses. chosen approach makes it possible obtain wettability, but same morphology. parameter t* corresponding time when capillary wave reaches droplet apex established. It shown that for earlier moments, height change does not depend type used substrate. A comparison data other authors made motion line weakly depends structure if its characteristic size less than 10 μm.