| In recent years, hollow silica has attracted much attention because of its special structure and remarkable physical and chemical properties. Hollow silica is mainly used for the preparation of antireflection film. Antireflection film can not only increase the transmittance of glass, but also improve the scratch resistance and weather resistance of glass, it can be widely used in photovoltaic industry. The transparency of hollow silica and excellent electrical property of silver nanowires,using PET as substrate, can produce transparent conductive film. This film has high transmittance as well as good electrical conductivity. Besides, it also achieves the flexibility of the conductive film. This film can be used for the design of conducting equipment of different shapes.The research mainly employed template method and microemulsion method to prepare the hollow silica aluminum gel. The study explored the influence of many technical parameters, containing the variety of dispersant, silicon aluminum source and the reaction temperature and time, on the process of colloid by template method.It is suggested that using polystyrene as the template resulted in the larger diameter particle of silica aluminum gel(120 nm), but stability was very poor. In microemulsion method, this study investigated the effect of the type of oil phase,silica and alumina ratio, the reaction temperature and time on colloidal formation. The research result indicated that using hexadecyl trimethyl ammonium bromide as the emulsifier realized the preferable effect. The length of oil phase molecular chain had a direct influence on the size of particle. The shorter the length was, the smaller the particle size was. As the temperature rising, the reaction rate increased. Affected by objective factors, however, the reaction temperature had to be controlled in 50℃. If the reaction time was too long, it would destroy the hollow structure. Thus, the reaction time had to be controlled in 75-80 min. When the concentration of ethyl silicate was controlled in 8.3 wt%, the concentration of sopropanol aluminum was controlled in 0.4 wt%, and the ratio of silica and alumina was 20.75, the particle size was the smallest. The size was about 60 nm, which had a good monodispersity.Besides, the study explored the influence of the colloid concentration, number ofspin and spin rate on antireflection film. Findings showed the best antireflection film performance was obtained when the concentration of gel was controlled in 1.35mg/m L and the spin speed was controlled in 3000 rpm with double spin-coating after500℃ calcination treatment. The film thickness was about 150 nm and its spreading property was good. Under the optimum preparation conditions, the glass had antireflection effect(about 2.5% at 550 nm) within 300-800 nm wavelength. In terms of transparent conductive film, the research focused on the influence of the concentration of silver nanowires, coating methods and the concentration on colloid.The finding showed that the higher the concentration of silver nanowires was, the lower the film sheet resistance was. However, the transmittance of the film and the fog degree value would rise. When the concentration of silver nanowires was controlled in 1.52 mg/m L, the best conductive film performance was obtained by the vertical lifting method. The transmittance of the film could achieve 93.14%, the fog degree value of 1.67%, the sheet resistance of 93 Ω/sq. |
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