制备条件对气凝胶粉末粒径的影响
Influence of preparation factors on the size of aerogel powder
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摘要: 利用超声波乳化技术，结合溶胶-凝胶反应制备了间苯二酚-甲醛有机气凝胶粉末和碳化气凝胶粉末。通过大量实验，探讨了制备条件对气凝胶粉末粒径的影响。在粉末干燥前以Zeta电位-粒径分布测试仪对乙醇悬浊液进行分析测试，对有机粉末和碳化粉末用TEM方法进行表征。研究了反应液质量分数、反应温度和时间以及分散剂与反应液体积比对产物粒径的影响。实验表明：制备条件对于制备纳米级的气凝胶粉末影响非常大，通过优化实验条件可以制备出分布较好的气凝胶粉末，超声功率较大容易实现体系均匀混合，反应液在反应过程中温度和时间的控制起着关键的作用，低质量分数的反应液所生成的产物比高质量分数的粒径要小,经碳化后粉末粒径进一步降低。Abstract: Organic powder and carbon aerogel powder were prepared by sol-gel method with the help of ultrasonic emulsification technology using resorcinol and formaldehyde. Different experimental conditions were investigated to reveal the formation mechanism of aerogel powder. The particle-diameter distributions were measured with Zetasizer, and the aerogel powder was checked with TEM. The influences of supersonic field, the mass percentage, temperature, time and the volume ratio of dispersant to reactive liquid were investigated to optimize the experimental conditions.
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Key words:
- ultrasonic emulsification /
- sol-gel method /
- aerogel powder /
- preparation factors /
- size of particles
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