密度梯度SiO2气凝胶块体的成功制备与性能表征(英文)

Successful Production and Characterization of Gradient Density SiO_2 Aerogel Monoliths

通过连续成型工艺成功制备出密度梯度SiO_2气凝胶块体,气凝胶块体的形状呈线性均匀收缩。该气凝胶的密度变化范围从0.010~0.150 g/cm^3。随着气凝胶的密度自低到高的变化,其透明度逐渐增加,灰度逐渐减少,这也从侧向体现了气凝胶具备密度梯度功能特性。该SiO2气凝胶在密度较低区域比表面积为859 m^2/g,.孔容约5.7 cm^3/g,对应的较高度度区域内气凝胶的比表面积为565m^2/g,孔容约有2.8 cm^3/g。此外,这种连续成型法同样可以适用于其他材料的密度梯度制备。

Continuous formation technics were used for the fabrication of gradient density silica aerogel monoliths.The shape of gradient density silica aerogel monoliths shrink linearly.Its density ranged approximately from 0.010-150 g/cm^3.With the density varying from low to high,the transparency of the sample increased and gray scale decreased,which presented a gradient distribution.The gradient density aerogel monoliths also had a high surface area(859 m^2/g) and high pore volume(5.7 cm^3/g) in low density areas;in contrast,the high density areas of silica monoliths had a low specific surface area 565 m^2/g and low pore volume(2.8 cm^3/g).This continuous formation technics may potentially be expanded to the fabrication of other gradient density materials.