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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Preparation of super hydrophobic silica aerogel and study on its fractal structure
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Preparation of super hydrophobic silica aerogel and study on its fractal structure

机译：超疏水二氧化硅气凝胶的制备及其分形结构的研究

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摘要

The experimental results on silica aerogels with super hydrophobic property are reported. Silica alcogels were prepared via a two-step acid/base process by keeping the molar ratio of tetraethyoxysiliane (TEOS), ethanol (EtOH), water (H2O), hydrochloric acid (HCl) and ammonia (NH4OH) constant at 1:6:8:1.0 x 10(-3):1.1 x 10(-2), respectively, and varying the molar ratio of N,N-dimethylformamide (DMF)/TEOS (G) from 0 to 1.2. After two aging treatment steps, they were modified by isopropyl alcohol (IPA)/trimethylchlorosilane (TMCS)-hexane solution at 60 degrees C. It was found that G Value at 0.8 resulted in low density (similar to 0.2 g cm(-3)) and the minimum volume shrinkage (similar to 6%), with the total water adsorption ratio similar to 5.1% when exposed to water for 3 months and the contact angle 0 approximate to 178 degrees. Besides, the aerogels (G = 0.8) had higher volume fractal dimension (similar to 1.8), which indicted that it possessed better connectivity and more uniform particle sizes.
机译：报道了具有超疏水性的​​二氧化硅气凝胶的实验结果。二氧化硅醇凝胶是通过两步酸/碱法制备的，将四乙氧基硅ilia烷（TEOS），乙醇（EtOH），水（H2O），盐酸（HCl）和氨气（NH4OH）的摩尔比保持恒定为1：6： 8：1.0 x 10（-3）：1.1 x 10（-2），并将N，N-二甲基甲酰胺（DMF）/ TEOS（G）的摩尔比从0更改为1.2。经过两个时效处理步骤后，在60摄氏度下用异丙醇（IPA）/三甲基氯硅烷（TMCS）/正己烷溶液对其进行了改性。发现0.8的G值导致密度低（类似于0.2 g cm（- 3））和最小体积收缩率（大约6％），当暴露于水中3个月且接触角0约为178度时，总吸水率接近5.1％。此外，气凝胶（G = 0.8）具有更高的体积分形维数（近似于1.8），这表明它具有更好的连通性和更均匀的粒径。

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