Preparation Of The Superhydrophobic Surfaces By A Solid-Liquid-Vapor Diffused Method

In nature, many creatures exhibit fascinating surface wettability. A surface whose water contact angle is greater than 150°is commonly called a superhydrophobic surface. In fact, various methods for the processing of such surfaces are being investigated. The research prospects about superhydrophobic surfaces can be potentially applied in self-cleaning surfaces, antireflection coatings and mico-fluidic devices ect. However, the fabrication techniques for superhydrophobic surfaces are not only complicated but also expensive, limiting their practical applications. As a consequence, it still remains a great challenge to develop simple and convenient techniques for the fabrication of superhydrophobic surfaces.The main research progresses of this thesis are shown as follow:1. The recent development of the studies on superhydrophobic phenomena which existed in the nature was reviewed. The current biomimetic preparation of the superhydrophobic surfaces, the properties of the superhydrophobic surfaces, and the potential applications of the superhydrophobic surfaces were reviewed too.2. In the present study, we prepared perfectly superhydrophobic coatings on the common glass substrates by a simple solid -liquid- vapor method. The superhydrophobic coatings were characterized by contact angle(CA), thermogravimetric-Differential scanning calorimetry(TG-DSC), Fourier transform infrared spectrometry(FT-IR) and field emission scanning electron microscope (FESEM). The results showed that the superhydrophobic coatings were consisted of entangled tortuous silicone nanofibers and water contact angle is greater than 160°.3. In the present study, a secondary growth method for the synthesis of zeolite membrane is developed for silicalite-1 zeolite membrane synthesis. This thesis was focused on study of the influence of different factors on the morphology and property of Silicalite-1 zeolite membranes prepared by secondary growth method. X-ray diffractometry (XRD), thermogravimetric-Differential scanning calorimetry(TG-DSC) and field emission scanning electron microscope(FESEM) were used for characterizing these membranes. The characterization results showed that a continues and dense membrane with a high quality is formed.4. The superhydrophobic coatings were prepared on this silicalite-1 zeolite and water contact angle is greater than 160°. At the same time, chemical stability toward acid and alkaline aqueous solution and thermal stability of the superhydrophobic coatings have been also investigated. The results showed that the superhydrophobic coatings were excellence about chemical stability and thermal stability.