学术论文

      疏水型 SiO2气凝胶

      Hydrophobic SiO2 Aerogels Prepared with Polyethoxydisiloxanes

      摘要:
      以多聚硅为硅源,通过溶胶-凝胶、表面修饰及超临界干燥过程制备出了疏水型SiO2气凝胶. 表面修饰后SiO2气凝胶孔洞由修饰前的23.1nm减小到18.2nm,比表面积由修饰前的477m2g-1增加到563m2g-1,骨架颗粒比修饰前略大,饱和水蒸汽吸附量由吸附前的0.04(重量比)降低到0.0012, 且与水不浸润.
      Abstract:
      Hydrophobic SiO2 aerogels were produced by the surface modification of alcogels prepared via sol-gel process using polyethoxydisiloxanes (E-40) as the precursor and followed by ethanol supercritical drying. The structure of the modified silica aerogels was a silica matrix produced by hydrolysis and condensation of polyethoxydisiloxanes. Si-CH3 was modified on the surface of the silica matrix. The pore size decreased from 23.1nm to 18.2nm, the specific surface area increased from 477 m2*g-1 to 563 m2*g-1 and the water vapor adsorption decreased from 0.04 to 0.0012(weight ratio) after the surface modification of silica aerogels. The existence of Si-CH3 was observed using infrared spectra.
      作者: 邓忠生 [1] 魏建东 [1] 吴爱梅 [2] 暴玉萍 [1] 王珏 [1] 沈军 [1] 周斌 [1] 陈玲燕 [1]
      Author: DENG Zhong-Sheng [1] WEI Jian-Dong [1] Wu Ai-Mei [2] BAO Yu-ping [1] WANG Jue [1] SHEN Jun [1] ZHOU Bin [1] CHEN Ling-Yan [1]
      作者单位: 同济大学波耳固体物理研究所, 上海 200092 上海化工研究院, 上海 200062
      刊 名: 无机材料学报 ISTICEISCIPKU
      年,卷(期): 2000, 15(2)
      分类号: TM285
      机标分类号: O6 R17
      在线出版日期: 2004年1月8日
      基金项目: 国家自然科学基金,国家高技术研究发展计划(863计划),军品配套项目,上海市青年科技启明星计划