以廉价水玻璃为硅源,经溶胶-凝胶工艺和超临界干燥技术制备了SiO2气凝胶块体,并研究了制备条件对其成胶时间的影响.结果表明,成胶时间随稀释剂用量(水或无水乙醇)的减少和温度的升高而缩短,但随NH3·H2O添加量的增加先缩短后延长,并且以无水乙醇为稀释剂时较以水为稀释剂时短.典型样品的扫描电镜(SEM)表明纳米尺寸球形骨架颗粒构成了连续网状纳米多孔结构,并且由N2吸附测试得知所有孔径均＜61nm,平均为6.3nm,比表面积为297.7m2/g.
参考文献
| [1] | Muller C.A. .Organically Modified Titania-Silica Aerogels for the Epoxidation of Olefins and Allylic Alcohols[J].Journal of Catalysis,1999(1):280-293. |
| [2] | Maury S;Buisson P;Perrard A et al.[J].Journal of Molecular Catalysis B:Enzymatic,2004,29(1-6):133-148. |
| [3] | Hrubesh LW.;Satcher JH.;Coronado PR. .Solvent removal from water with hydrophobic aerogels[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2001(1/3):328-332. |
| [4] | Kim GS.;Hyun SH. .Synthesis of window glazing coated with silica aerogel films via ambient drying[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2003(1/3):125-132. |
| [5] | Smirnova I;Suttiruengwong S;Arlt W .Feasibility study of hydrophilic and hydrophobic silica aerogels as drug delivery systems[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2004(0):54-60. |
| [6] | 甘礼华,陈龙武,张宇星.非超临界干燥法制备SiO2气凝胶[J].物理化学学报,2003(06):504-508. |
| [7] | 甘礼华,张宇星,陈龙武,葛奇.干燥控制化学添加剂在制备硅气凝胶中的应用[J].同济大学学报(自然科学版),2003(09):1131-1134. |
| [8] | 邓忠生,魏建东,王珏.由多聚硅氧烷制备二氧化硅气凝胶[J].功能材料,2000(03):296. |
| [9] | 张志华,倪星元,沈军,杨庙祥.疏水型SiO2气凝胶的常压制备及吸附性能研究[J].同济大学学报（自然科学版）,2005(12):1641-1645. |
| [10] | 沈军,周斌,吴广明,邓忠生,倪星元,王珏.纳米孔超级绝热材料气凝胶的制备与热学特性[J].过程工程学报,2002(04):341-345. |
| [11] | 陈一民,赵大方,谢凯,肖加余.制备条件对疏水SiO2气凝胶结构和性能的影响[J].硅酸盐学报,2005(06):727-731. |
| [12] | 史非,王立久.环境气压干燥新工艺快速合成SiO2气凝胶研究[J].大连理工大学学报,2006(02):241-245. |
| [13] | 张秀华,赵海雷,何方,李雪,仇卫华,吴卫江,曲选辉.SiO2气凝胶的常压制备与表面改性[J].北京科技大学学报,2006(02):157-162. |
| [14] | Bhagat, SD;Kim, YH;Ahn, YS;Yeo, JG .Textural properties of ambient pressure dried water-glass based silica aerogel beads: One day synthesis[J].Microporous and Mesoporous Materials,2006(1/3):237-244. |
| [15] | Ho J;Zhu W;Wang HT;Forde GM .Mesoporous silica spheres from colloids[J].Journal of Colloid and Interface Science,2007(2):374-380. |
| [16] | Ryoji Takahashi;Satoshi Sato;Toshiaki Sodesawa;Takaya Goto;Katsuhiro Matsutani;Naoki Mikami .Bending strength of silica gel with bimodal pores: Effect of variation in mesopore structure[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2005(7):1148-1156. |
| [17] | Bhagat SD;Kim YH;Ahn YS;Yeo JG .Rapid synthesis of water-glass based aerogels by in situ surface modification of the hydrogels[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(6):3231-3236. |
| [18] | Lee S;Cha Y C;Hwang H J et al.[J].Materials Letters,2006,61(14-15):3130-3133. |
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