Preparation and properties of a mesoporous SBA-15/silica composited aerogel
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摘要: 以有序介孔二氧化硅顆粒SBA-15為添加劑,利用酸堿兩步法制備SBA-15/SiO2氣凝膠硅-硅復合材料.研究SBA-15添加量對氣凝膠復合材料的形成過程和性能的影響,采用掃描電鏡和氮氣吸附-脫附對樣品的結構進行表征,并測試其力學性能和熱導率.結果表明:少量有序介孔二氧化硅材料SBA-15的加入能大大縮短二氧化硅氣凝膠形成時間,提高氣凝膠復合材料的力學性能,并保持較低的熱導率,而材料的比表面積僅略有下降.Abstract: A mesoporous SBA-15/silica composited aerogel was prepared by a two-step acid-alkali method with SBA-15 as an additive. The effects of the amount of SBA-15 on the formation process and the performance of the eomposited aerogel were investigated. The microstructure of the composited aerogel was characterized by scanning electron microscopy and N2 adsorption-desorption isotherms, and the mechanical properties and thermal conductivity were tested. It is found that as a small amount of SBA-15 is added, the gelation time of silica greatly shortens, the mechanical properties improves, the thernlal conductivity still keeps small, while the specific surface area slightly decreases.
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Key words:
- aerogels /
- silica /
- mesoporous materials /
- preparation methods /
- mechanical properties /
- thermal conductivity
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