Silica aerogels were prepared at ambient drying by using ethanol/trimethylchlorosilane (TMCS)/heptane solution as pore water exchange and surface modification of the wet gel before drying. The obtained silica aerogels exhibit a sponge-like structure with uniform pore size distribution. The effects of heat-treatment on the hydrophobicity, specific surface area and other properties were investigated. The results indicated that the hydrophobicity of silica aerogels could be maintained up to 350℃. With increasing heating temperature, hydrophobicity decreased, and became completely hydrophilic after heat-treatment at 500℃. Brunaueremmitt-teller (BET) surface area results indicated that the specific surface area of silica aerogels increased with increasing heating temperature in the range of 150-500 ℃. The effects of heat-treatment on the morphology and chemical bonding state of silica aerogels were investigated by scanning electron microscopy (SEM),differential temperature analysis (DTA) and Fourier-transform infrared spectroscopy (FT-IR).
参考文献
| [1] | C A Muller;M Maciejewski;T Mallat;A Baiker .[J].Journal of Catalysis,1999,184:280. |
| [2] | S.Maury;P.Buisson;A.Perrard;A.C.Pierre .Influence of the sol-gel chemistry on the activity of a lipase encapsulated in a silica aerogel[J].Journal of molecular catalysis, B. Enzymatic,2004(1/6):133-148. |
| [3] | L W Hrubesh;P R Coronado;J H Satcher .[J].Journal of Non-Crystalline Solids,2001,285:328. |
| [4] | G S Kim;S H Hyun .[J].Journal of Non-crystalline Solids,2003,320:125. |
| [5] | W C Ackerman;M Vlachos;S R Rouanet;J Fruendt .[J].Journal of Non-Crystalline Solids,2001,285:264. |
| [6] | K Kamiuto;T Miyamoto;S Saitoh .[J].Applied Energy,1999,62:113. |
| [7] | I Smirnova;J Mamic;W Arlt .[J].Langmuir,2003,19:8521. |
| [8] | Y G Kwon;S Y Choi;E S Kang;S S Baek .[J].Journal of Materials Science,2000,35:6075. |
| [9] | S W Park;S B Jung;J K Yang;H H Park and H C Kim .[J].Thin Solid Films,2002,420-421:461. |
| [10] | M A Einarsrud;E Nilsen .[J].Journal of Non-crystalline Solids,1998,226:122. |
| [11] | A Venkateswara Rao;E Nilsen;M A Einarsrud .[J].Journal of Non-Crystalline Solids,2001,296:165. |
| [12] | F Schwertfeger;D Frank;M Schmidt .[J].Journal of Non-Crystalline Solids,1998,225:24. |
| [13] | C J Lee;G S Kim;S H Hyun .[J].Journal of Materials Science,2002,37:2237. |
| [14] | 史非,王立久,刘敬肖.纳米介孔SiO2气凝胶的常压干燥制备及表征[J].硅酸盐学报,2005(08):963-967,974. |
| [15] | P B Wagh;S V Ingale .[J].Ceramics International,2002,28:43. |
| [16] | I Smirnova;A W Suttiruengwong .[J].Journal of Non-Crystalline Solids,2004,350:54. |
| [17] | V D Land;T M Harris;D C Teeters .[J].Journal of Non-Crystalline Solids,2001,283:11. |
| [18] | 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. |
| [19] | Fei SHI;Lijiu WANG;Jingxiao LIU;Shuhai LI .[J].New Building Mater,2004,6:19. |
| [20] | A Y Jeong;S M Goo;D P Kim .[J].Journal of Sol-Gel Science and Technology,2000,19:483. |
| [21] | A Venkateswara Rao;M M Kulkarni;D P Amalnerkar;T Seth .[J].Applied Sueface Science,2003,206:262. |
| [22] | S K Kang;S Y Choi .[J].Journal of Materials Science,2000,35:4971. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%