A rapid one-step process for fabrication of biomimetic superhydrophobic surfaces by pulse electrodeposition

Inspired by some typical plants such as lotus leaves, superhydrophobic surfaces are commonly prepared by a combination of low surface energy materials and hierarchical micro/nano structures. In this work, superhydrophobic surfaces on copper substrates were prepared by a rapid, facile one-step pulse electrodepositing process with different duty ratios in an electrolyte containing lanthanum chloride (LaCl3•6H2O), myristic acid (CH3(CH2)12COOH) and ethanol. The equivalent electrolytic time was only 10 min. The surface morphology, chemical composition and superhydrophobic property of the pulse electrodeposited surfaces were fully investigated with SEM, EDX, XRD, contact angle meter and time-lapse photographs of water droplets bouncing method. The results show that the as-prepared surfaces have micro/nano dual scale structures mainly consisting of La[CH3(CH2)12COO]3 crystals. The maximum water contact angle (WCA) is about 160.9° and the corresponding sliding angle is about 5° . This method is time-saving and can be easily extended to other conductive materials, having a great potential for future application.