| 溶剂对块体La基气凝胶性能的影响 |
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| 引用本文： | 朱秀榕,周斌,杜艾,余意,苑举君,余华军,张宪科.溶剂对块体La基气凝胶性能的影响[J].强激光与粒子束,2015,27(11):112011. |
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| 作者姓名： | 朱秀榕 周斌 杜艾 余意 苑举君 余华军 张宪科 |
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| 作者单位： | 1.赣南师范学院 物理与电子信息学院, 江西 赣州 341 000; |
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| 摘 要： | 采用溶胶-凝胶工艺,以氯化镧(LaCl3·7H2O)为前驱体,以甲醇和乙醇为溶剂,聚丙烯酸为分散剂,环氧丙烷为凝胶促进剂,分别合成两种性能不同的稀土La基气凝胶。采用扫描电子显微镜、傅里叶红外光谱仪、比表面积与孔径分析仪、力学性能测试仪对不同溶剂制备的两种稀土La基气凝胶的微观结构、成分、比表面积、孔径分布和力学性能进行了研究表征。结果表明,以甲醇和乙醇为溶剂制备的稀土La基气凝胶都具有纳米多孔材料的典型特征,由大量nm量级的球形和长条形颗粒胶连而成,孔洞结构丰富。以乙醇为溶剂制备的稀土La基气凝胶的网络骨架更纤细,孔洞更大,比表面积达到220m2·g-1,密度约为160mg·cm-3,但力学性能较差。而以甲醇为溶剂制备的稀土La基气凝胶的网络骨架更强壮,孔洞更小,比表面积达到95m2·g-1,密度约为350mg·cm-3,力学性能较好。样品性能上的差异可能是由甲醇的极性比乙醇的极性强引起的。
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| 关 键 词： | 稀土 镧 气凝胶 溶胶-凝胶 力学性能 |
Influence of solvents on properties of monolithic La-based aerogels |
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| Affiliation: | 1.School of Physics and Electronic Information,Gannan Normal University,Ganzhou 341000,China;2.Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai 200092,China |
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| Abstract: | La-based aerogels were synthesized by using LaCl37H2O as precursor, methanol and ethanol as solvents, via sol-gel process. The microstructure, components, specific surface area, pore diameter distribution and mechanical properties were characterized by scanning electron microscopy, Fourier transform infrared spectrometer, adsorption/desorption analysis and mechanical property tester, respectively. The results reveals that La-based aerogels derived from methanol and ethanol have a three-dimension network that consists of interconnected bead-like particles with diameters varying from several tens to hundreds nanometer. Comparing to the aerogel (specific surface area: 95 m2g-1, density: about 350 mgcm-3) derived from methanol, the aerogel (specific surface area: 220 m2g-1, density: about 160 mgcm-3) derived from ethanol possesses better pore morphology and worse mechanical property. The properties of the La-based aerogels can be attributed to the stronger polarity of methanol. |
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