研究了滴落法制备毫米级SiO2气凝胶球的性能.将SiO2气凝胶粉末(疏水角约为126°)平铺在平面上预制为载台,将水玻璃(模数n＝1．8~2．3)离子交换制备出溶胶,调节 pH 值后分散滴落于载台上,可保持为毫米级溶胶球；凝胶化处理后,将其转移乙醇溶液老化,经溶剂交换和表面改性,常压干燥制备出毫米级疏水性Si O 2气凝胶球.SiO2气凝胶球较好保持直径为1~2 mm 球状形貌,具有滚动性；BET 分析表明其比表面积约为730 m2/g,其介孔为近圆柱形细长孔道,平均孔径为7~10 nm；SEM显示其呈连续网络纳米孔；FT-IR 表明在其制备过程枝接了—CH3,并具有良好的疏水性；DSC-TGA分析表明其在1000℃以内热稳定性良好.
Preparation and performance of silica aerogel millimeter-beads by dropping method were studied in this paper.The silica aerogel powder (hydrophobic angle-126°)was paved evenly on the plane as the prefabrica-ted platform.Water glass (n=1.8-2.3)was made into silica sol by ion exchange,and sol which was adjusted the pH value was dropped dispersedly on the platform,which remained sol millimeter-beads.After the gelation, the millimeter-beads was aged in the ethanol,then via solvent exchange and surface modification,the hydro-phobic SiO2 aerogel millimeter-beads were prepared finally by ambient pressure drying.The diameter of the SiO2 aerogel beads was about 1-2 mm with an excellent spherical morphology at the macro and rolling well;BET analysis indicates that its surface area was above 730 m2/g,and the hysteresis loop of adsorption-desorp-tion curves indicates that its microporous structure was nearly elongate cylindrical bore,and the average pore diameter was 7-10 nm;SEM indicates that its microstructure has continuous network with nano-porous;FT-IR shows that it has a good hydrophobicity because it was grafted —CH3 during its preparation;DSC-TGA analysis indicates that it has a good thermal stability below 1 000 ℃.
参考文献
| [1] | 何方;熊先文;吴菊英;黄渝鸿;张瑞珠;邹文俊;彭进;马秋花;朱贺;李荣春.SiO2气凝胶微球的雾化制备及表征[J].功能材料,2013(1):143-146. |
| [2] | He, Ya-Ling;Xie, Tao.Advances of thermal conductivity models of nanoscale silica aerogel insulation material[J].Applied thermal engineering: Design, processes, equipment, economics,2015:28-50. |
| [3] | Zhao, Y.;Tang, G. H.;Du, M..Numerical study of radiative properties of nanoporous silica aerogel[J].International Journal of Thermal Sciences,2015:110-120. |
| [4] | Pradip B. Sarawade;Jong-Kil Kim;Askwar Hilonga.Production of low-density sodium silicate-based hydrophobic silica aerogel beads by a novel fast gelation process and ambient pressure drying process[J].Solid state sciences,20105(5):911-918. |
| [5] | Jinbin Lin;Hongling Chen;Ting Fei;Chang Liu;Jinlong Zhang.Highly transparent and thermally stable superhydrophobic coatings from the deposition of silica aerogels[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013May 15(May 15):776-786. |
| [6] | 王妮;任洪波.不同硅源制备二氧化硅气凝胶的研究进展[J].材料导报,2014(1):42-45,58. |
| [7] | 胡银;张和平;黄冬梅;何松;毕海江;杨晖;程旭东.柔韧性块体疏水二氧化硅气凝胶的制备及表征[J].硅酸盐学报,2013(8):1037-1041. |
| [8] | 吕鹏鹏;赵海雷;刘欣;李兴旺.常压干燥制备SiO2气凝胶的研究[J].材料工程,2012(4):22-26. |
| [9] | C.C. Li;Y.T. Chen;Y.T. Lin;S.F. Sie;Y.W. Chen-Yang.Mesoporous silica aerogel as a drug carrier for the enhancement of the sunscreen ability of benzophenone-3[J].Colloids and Surfaces, B. Biointerfaces,2014:191-196. |
| [10] | 毕海江;黄冬梅;何松;李治;杨晖;程旭东.改性剂对二氧化硅气凝胶性能的影响[J].材料科学与工程学报,2014(2):178-182. |
| [11] | Jianjun Li;Jungang Cao;Li Huo;Xiaodong He.One-step synthesis of hydrophobic silica aerogel via in situ surface modification[J].Materials Letters,2012:146-149. |
| [12] | Omranpour, H.;Motahari, S..Effects of processing conditions on silica aerogel during aging: Role of solvent, time and temperature[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,2013:7-11. |
| [13] | Kim, CY;Lee, JK;Kim, BI.Synthesis and pore analysis of aerogel-glass fiber composites by ambient drying method[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2008:179-182. |
| [14] | Zaidong Shao;Fengzuan Luo;Xuan Cheng;Ying Zhang.Superhydrophobic sodium silicate based silica aerogel prepared by ambient pressure drying[J].Materials Chemistry and Physics,20131(1):570-575. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%