Preparation and characterization of polyhedral oligomeric silsesquioxane-zirconia aerogels
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摘要: 以官能团化的多面体低聚倍半硅氧烷（POSS-［C2H4Si(OEt)3］8）和正丁醇锆为原料，以乙醇作为溶剂，通过溶胶-凝胶及二氧化碳超临界干燥成功制备了三种不同锆含量POSS-ZrO2的复合气凝胶。并用傅里叶变换红外光谱分析仪（FTIR）、扫描电镜（SEM）、X射线衍射仪（XRD）和比表面吸附仪（BET）对其进行表征。结果表明：该气凝胶中有SiOZr键，并且所得气凝胶都是无定型的，其比表面积随着锆含量的增加而变小，最高可达491 m2/g，并且其孔径分布都比较广。
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关键词:
- 多面体低聚倍半硅氧烷 /
- 氧化锆 /
- 复合气凝胶 /
- 超临界干燥
Abstract: The polyhedral oligomeric silsesquioxane(POSS)-zirconia aerogels which contain three different contents of zirconia were successfully prepared from the POSS-［C2H4Si(OEt)3］8 and Zr(OC4H9)4 by the sol-gel process and subsequently supercritical drying with carbon dioxide. Ethanol was used as the solvent during the process. The samples were characterized by FTIR, SEM, XRD and BET. The results indicate that the three samples all have homogeneous Si-O-Ti bonds, and they are amorphous. The BET surface areas decrease with the increasing of the contents of zirconia, the biggest surface area is 491 m2/g, and all the pore distributions of the three samples are broad. -
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