Optically transparent, superhydrophobic methyltrimethoxysilane based silica coatings without silylating reagent

► Contact angle value reached up to 171°. ► Thermal conductivity of the silica coating is 0.089 Wm−1 K−1. ► The superhydrophobic coatings stable up to 457 °C. ► The optical transmission study shows coatings have nearly 91% transmission in the visible region.