二氧化硅气凝胶是目前世界上最轻的人造多孔固体材料。采用硅酸钠为硅源,通过采取老化、溶剂置换、表面改性和分级干燥等一系列措施,常压干燥制得SiO2气凝胶颗粒,并利用红外光谱、比表面分析、扫描电镜等测试方法对其结构、形貌及化学组成进行了分析。研究表明:该样品呈疏水性,孔径较小,比表面积为740m2/g,孔体积为0.89cm3/g,平均孔径为4.8nm。 Silica airgel is the world’s lightest artificial porous solid material. Using sodium silicate as a silicon source, SiO2 airgel particles were prepared by a series of measures such as aging, solvent substitution, surface modification and graded drying. The samples were characterized by FTIR, SEM, SEM and other tests Methods Its structure, morphology and chemical composition were analyzed. The results show that the sample is hydrophobic, the pore size is small, the specific surface area is 740m2 / g, the pore volume is 0.89cm3 / g and the average pore size is 4.8nm.