Er Li

Fabrication of CdS films with superhydrophobicity by the microwave assisted chemical bath deposition

A simple method of microwave assisted chemical bath deposition (MA-CBD) was adopted to fabricate cadmium sulfide (CdS) thin films. The superhydrophobic surface with a water contact angle (CA) of 151 degrees was obtained. Via a scanning electron microscopy (SEM) observation, the film was proved having a porous micro/nano-binary structure which can change the property of the surface and highly enhance the hydrophobicity of the film. A possible mechanism was suggested to describe the growth of the porous structure, in which the microwave heating takes an important role in the formation of two distinct characteristic dimensions of CdS precipitates, the growth of CdS sheets in micro-scale and sphere particles in nano-scale. The superhydrophobic films may provide novel platforms for photovoltaic, sensor, microfluidic and other device applications.

Superhydrophobic behavior on transparency and conductivity controllable ZnO∕Zn films

This study employs a facile method to selectively fabricate a pair of ZnO films on glass slide with controllable transparency and conductivity. The resultant surfaces both show static superhydrophobicity with alike contact angles of 155° and 158° but exhibit a significant difference under dynamic conditions. The sliding angle of the clustered ZnO film is 31° smaller than that of the one randomly covered with nanorods, due to its more discrete wetting structure of multiscaled hierachical architecture of the clusters. The kinetic mechanism is briefly discussed and a further modification for nanorod film to achieve real superhydrophobicity is suggested.

Stable superhydrophobic surface: fabrication of interstitial cottonlike structure of copper nanocrystals by magnetron sputtering

Abstract A stable superhydrophobic copper surface was obtained by radio-frequency magnetic sputtering on Si (100) and quartz substrates. The water contact angle and sliding angle of the superhydrophobic copper surface were 160.5° and 3±1.9°, respectively. Scanning electron microscopy (SEM) photos show that the superhydrophobic surface structure comprises many uniform nanocrystals with a diameter of about 100 nm. A brief explanation of the formation of this special microstructure and the mechanism of its wettability were proposed.