Localized electrochemical deposition of bionic salvinia molesta micro-array structure

Surfaces with an array of Salvinia molesta usually have special bionic properties. The forward manufacturing of the structure of Salvinia molesta with a scepter shape has always been a challenge of manufacturing. This paper uses the localized electrochemical micro additive manufacturing technique based on the atomic force probe to make the optimized Salvinia molesta array structure. The metal salt solution is driven by air pressure for directional feeding, and under the action of the electric field, copper ions are reduced to atoms deposited on the substrate to form a three-dimensional(3D) micro-nano metal structure. The surface morphology, element composition, adhesion and contact angle of the fabricated Salvinia molesta array were characterized and analyzed by scanning electron microscope and contact angle meter. The results show that the complete surface of Salvinia molesta with micron scepter structures can be prepared by this technology, the monomer structure is in diameter of
$5\ \mu\mathrm{m}$
and in height of
$67\ \mu\mathrm{m}$
, and the content of copper on the surface of the deposit structure is up to 98.7%. It shows low adhesion property in the experiment. The micro/nano gradient structure of bionic Salvinia molesta endows it with good hydrophobic property, and its static contact angle to the water reaches 101.1°, which can realize hydrophobic function without any surface modification.