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摘要
The effects of compression, thermal treatment and doping process on microstructure of fumed silica compacts were investigated by nitrogen adsorption analysis. The results showed that, during the compression process, the interspace among agglomerates could be continually compacted to form a regional superposed area filling of newborn nanopores to achieve considerable enhancement of effective porosity, which was measured by nitrogen adsorption. During thermal treatment process, adjacent particles in aggregate consolidated to induce the formation of a new bigger aggregate unit. The multistep nanoporous structure in fumed silica matrix could not be fundamentally changed after introducing nanosized Al2O3 powder. However, the regional nanoporous structure could be destroyed after introducing fibres.
- 出版日期2014-5
- 单位东北大学
