Preparation of monolithic copper-based aerogel via ambient pressure drying

来源 :2014中国溶胶-凝胶学术研讨会暨国际论坛 | 被引量 : 0次 | 上传用户:xbq001
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  Monolithic copper-based aerogels with high porosity were successfully prepared by ambient pressure drying through a multi-step solvent exchange approach which may replace the more costly and dangerous operation of supercritical drying.The multiple treatment was found to be necessary to achieve sufficient modification of the wet gel for reduction in drying-induced surface tension force to maintain the aerogels integrity and high porosity.The aerogels structural properties were characterized by the field emission scanning electron microscopy (FESEM), the high resolution transmission electron microscopy HRTEM).The results indicate that the aerogel prepared via ambient pressure drying process shows typical three-dimensional network structure with the particles arranged closely.The Brunauer-Emmett-Teller (BET) analysis shows that the surface area of the aerogel is about 272m2/g, and pore diameter is about 20nm.In conclusion, the procedure reduced the volume shrinkage, increased the monolith and porosity of the resulting aerogels.
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