以正硅酸乙酯为硅源,分别以 HF 和 HF/氨水为催化剂,通过溶胶-凝胶法常压制备 SiO2 气凝胶.研究表明以 HF 为催化剂能有效地加快反应的速度,当以 HF/氨水为催化剂时对产品的合成和性能产生更大的影响.用热重分析仪(TG-DTA)、比表面(BET)、XRD、傅里叶变换红外光谱仪、激光粒度仪等仪器对两种产品微结构测试结果表明:两种产品都是非晶纳米多孔结构,体积平均粒径小于 20μm,为介孔结构.
参考文献
| [1] | 陈龙武,甘礼华,侯秀红.SiO2气凝胶的非超临界干燥法制备及其形成过程[J].物理化学学报,2003(09):819-823. |
| [2] | 王钰;沈军;Fricke J .高效隔热材料掺及玻璃纤维硅石气凝胶的研制[J].材料研究学报,1995,9(06):568-572. |
| [3] | 沈军;王钰;甘礼华 等.溶胶-凝胶法制备 SiO2 气凝胶及其特性研究[J].无机材料学报,1995,10(01):69-75. |
| [4] | 周斌;王钰;沈军 等.丙酮为溶剂制备 SiO2 气凝胶[J].无机材料学报,1996,11(03):520-524. |
| [5] | Husing N;Schubert U .Aerogele-luftige materialien:chemie,strukur und eigenschaften[J].Angewandte Chemie International Edition,1998,377(1-2):22-47. |
| [6] | Prakash S S;Brinker C J;Hurd A J et al.Silica aerogel films prepared at ambient pressure by using surface derivatization to induce reversible dying shrinkage[J].Nature(London),1995,374:439. |
| [7] | A. Venkateswara Rao;S.D. Bhagat .Synthesis and physical properties of TEOS-based silica aerogels prepared by two step (acid-base) sol-gel process[J].Solid state sciences,2004(9):945-952. |
| [8] | Wagh P B;Ingale S V.Comparison of some physieo-chemical properties of hydrophilic and hydrophobic silica aerogels[J].Ceramics International,2002(28):43-50. |
| [9] | Nilsen E;Einarsrud MA;Scherer GW;Norwegian Univ Sci & Technol Dept Inorgan Chem N-7034 Trondheim Norway. .Effect of precursor and hydrolysis conditions on drying shrinkage[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,1997(2/3):135-143. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%