Electroless deposited robust Ni–B films coated with trimethylsiloxysilicate exhibit superhydrophobicity

Abstract

We prepared electroless deposited Ni–B alloy films treated with trimethylsiloxysilicate (TMSS) that showed superhydrophobicity. Hydrophilic electroless deposited Ni–B films were made to be superhydrophobic by immersing them into an ethanolic solution of TMSS and water. This treatment lowered the surface energy of the electroless deposited Ni–B alloy films because hydrophobic TMSS was immobilized on them. A small amount of coexisting water promoted this immobilization process. In addition, the electroless deposition time had significant influence on the wettability of Ni–B films because micro- and nanometre-sized roughness was developed with the prolonged electroless deposition time. The superhydrophobic Ni–B films continuously repelled running water, and superhydrophobicity was maintained after rubbing them with bare fingers.