本文以正硅酸乙酯(TEOS)为前驱体,通过酸碱两步溶胶-凝胶法,常压干燥制备疏水性SiO2气凝胶.研究了两种改性剂(三甲基氯硅烷、六甲基二硅氮烷)对二氧化硅气凝胶结构和性能的影响.对制备的气凝胶样品进行表面微观形态分析、热重差热分析、傅里叶红外分析以及比表面积分析.结果表明,通过改性制备的样品具有较好的性能,使用六甲基二硅氮烷改性得到的SiO2气凝胶密度为0.204g/cm3,接触角为128°,BET比表面积为973m2/g,平均孔径7.57nm;使用三甲基氯硅烷改性得到的SiO2气凝胶密度为0.115g/cm3,疏水性优良,接触角为158°,BET比表面积为1067m2/g,平均孔径13.40nm.综合考虑各种因素,采用TMCS进行改性制备得到的SiO2气凝胶综合性能更加优异.
参考文献
| [1] | Gerard Marcel Pajonk .Some applications of silica aerogels[J].Colloid and polymer science,2003(7):637-651. |
| [2] | 秦国彤,门薇薇,魏微,李大鹏.气凝胶研究进展[J].材料科学与工程学报,2005(02):293-296. |
| [3] | Hrubesh LW. .Aerogel applications[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,1998(1):335-342. |
| [4] | Debra R.Rolison;Bruce Dunn .Electrically conductive oxide aerogels:new materials in electrochemistry[J].Journal of Materials Chemistry,2001,11:963-980. |
| [5] | Ann M. Anderson;Mary K. Carroll;Emily C. Green .Hydrophobic silica aerogels prepared via rapid supercritical extraction[J].Journal of Sol-Gel Science and Technology,2010(2):199-207. |
| [6] | 杨小云,周斌,肖淑芳,杜艾,吴广明,沈军.高比表面积Ag掺杂SiO2气凝胶的制备及表征[J].材料科学与工程学报,2008(05):735-738. |
| [7] | Schwertfeger F.;Schmidt M.;Frank D. .Hydrophobic waterglass based aerogels without solvent exchange or supercritical 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,1998(1):24-29. |
| [8] | Mahadik, D.B.;Rao, A.V.;Rao, A.P.;Wagh, P.B.;Ingale, S.V.;Gupta, S.C. .Effect of concentration of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDZ) silylating agents on surface free energy of silica aerogels[J].Journal of Colloid and Interface Science,2011(1):298-302. |
| [9] | A. Parvathy Rao;A. Venkateswara Rao;G.M. Pajonk .Hydrophobic and physical properties of the ambient pressure dried silica aerogels with sodium silicate precursor using various surface modification agents[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(14):6032-6040. |
| [10] | 史非,王立久,刘敬肖,曾淼.介孔SiO2气凝胶的常压干燥制备研究[J].无机化学学报,2005(11):1632-1636. |
| [11] | Ae-Young Jeong;Sang-Man Goo;Dong-Pyo Kim .Characterization of Hydrophobic SiO_2 Powders Prepared by Surface Modification on Wet Gel[J].Journal of Sol-Gel Science and Technology,2000(1/3):483-487. |
| [12] | 吕雅楠;王维;邱小林 等.常压制备低孔径高比表面积疏水SiO2气凝胶[J].材料导报,2011,25(18):38-40. |
| [13] | Jyoti L Gurav;A. Venkateswara Rao;Uzma K.H. Bangi .Hydrophobic and low density silica aerogels dried at ambient pressure using TEOS precursor[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2009(1/2):296-302. |
| [14] | Poonam M. Shewale;A. Venkateswara Rao;A. Parvathy Rao .Effect of different trimethyl silylating agents on the hydrophobic and physical properties of silica aerogels[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2008(21):6902-6907. |
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%