Researches of Fabrication of Globular ZnO and the Super-Hydrophobicity

Abstract

In order to reduce the adherence of platelets to the pyrolytic carbon surface of cardiac valve prosthesis, micro patterns are textured on the surface by nanosecond laser. As the basement, the textured pyrolytic carbon then reacts with formamide and zinc by hydrothermal method for preparation of globular ZnO film. In the process, the formamide concentration should be 10%, temperature at 70°C and the time lasts for 24 hours. Subsequently, scanning electron microscope (SEM) is employed for observation of its characteristics and morphologies and Optical Contact Angle Measuring Device (OCA) for measurement of contact angles. The experimental results indicate that the ZnO film produced on the textured pyrolytic carbon surface is a globular structure, similar to dandelions and the contact angle with super-hydrophobicity feature is 155 o. So it is concluded that globular ZnO film makes the rough pyrolytic carbon surface endowed with the characteristic of super-hydrophobicity.