基于TaCl_5的Ta_2O_5气凝胶制备工艺

Preparation of monolithic tantalic oxide aerogel from tantalic pentachloride

主要介绍了以TaCl5为前驱体，低分子醇类为溶剂，分别采用环氧丙烷和环氧氯丙烷作为凝胶促进剂制备Ta2O5湿凝胶，湿凝胶经过CO2超临界干燥而获得白色Ta2O5气凝胶。透射电镜图谱表明气凝胶是由粒度为10～20nm的颗粒堆积而成。N2等温吸附一脱附分析表明，气凝胶的比表面积为800～900m^2／g。

Monolithic tantalic oxide aerogels were synthesized from inorganic salt precursors, tantalic pentachloride by hydrolysis and condensation in alcohol solvent. The propylene oxide and the epichlorohydrin were used as gelling agent respectively. The tantalic oxide wet gels was obtained and washed in acetone to remove water and remaining PO. Finally, the wet gels were dried in supercritical CO2 instrument. This approach is straightforward, inexpensive and versatile, it produces monolithic mesoporous materials with high specific surface areas and very low bulk density. Dried tantalic oxide aerogel is characterized by transmission electron microscopy（TEM） and nitrogen adsorption/desorption analyses, and the specific surface area is about 800-900 m^2/g.