Fabrication And Study Of Organ/inorganic Biomemic Superhydrophobic Film

The rapid development of science and technology brings our great changes in life.This thesis describes several experiments in fabrication of superhydrophobic films, and elaborates series of new methods and theories in the field of superhydrophobic films:The first part covers the latest theoretical research, such as Wenzel equation, Cassie equation and a new experimental technique is proposed to easily measure both advancing and receding contact angles of a liquid on a solid surface, with unprecedented accuracy; the preparation methods: the Sol–Gel processing, chemical modification method, flame plating method, solution method, etching method, hydrothermal method, microscale phase separation method, in situ polymerization method, electrospinning method , and anodizing method , etc, which emerged in recent years were reviewed.; introduces the application of the latest features of superhydrophobic surface, in microscale material-energy filed, biomedical domain, optics filed, fuel economy area, and the application in battery, etc. Finally, we prospected the direction of development of the superhydrophobic surface preparation and theoretical research, objectively.The second part introduces two biomimetic superhydrophobic polymeric surfaces, which were obtained by a simple approach under ambient atmosphere. Water and ethanol were used as the nonsolvents in the method of phase separation in different systems. The influences of various factors in the process were investigated. Both of the as-prepared films showed excellent superhydrophobicity, depending on the high contact angle and the low contact angle hysteresis. Moreover, the classic and a new modified Cassie-Baxter relation were used on the polystyrene and poly-α-methyl styrene films to confirm the superhydrophobic performance.The third part shows a flame-like superhydrophobic yttrium aluminum garnet surface ,which was obtained by a simple approach under ambient conditions. The influences of the concentration of curing agent and paraffin wax in course of the experiment were investigated. The as-prepared film shows superhydrophobicity which has a water contact angle of 158±1.0°, and sliding angle of 4±1.0°. Moreover, the water contact angle of the rough surface remained higher than 150°, after exposure for 10 days. Transmission electronic microscope, scanning electronic microscope, fluorescence spectrometer and atomic force microscopy were also used to characterize the samples.The fourth part presents a kind of Polystyrene/silica nanoparticles, which were prepared by radical polymerization of silica nanoparticles possessing vinyl groups and styrene with benzoyl peroxide. The resulting vinyl silica nanoparticles, polystyrene/silica nanoparticles were characterized by means of Fourier transformation infrared spectroscopy, scanning electron microscopy and UV–vis absorption spectroscopy. The results indicated that polystyrene had been successfully grafted onto vinyl silica nanoparticles via covalent bond. The morphological structure of polystyrene/silica nanoparticles film, investigated by scanning electron microscopy, showed a characteristic rough structure. Surface wetting properties of the polystyrene/silica nanoparticles film were evaluated by measuring water contact angle and the sliding angle using a contact angle goniometer, which were measured to be 159°and 2°, respectively. The excellent superhydrophobic property enlarges potential applications of the superhydrophobic surfaces.