CAJ | 학술논문

以氨水为催化剂、正硅酸乙酯为硅源、醇为溶剂,采用改进的溶胶-凝胶工艺制备单分散SiO2微球,通过扫描电镜、激光粒度分析仪着重研究了正硅酸乙酯添加方式、反应温度、溶剂类型等单因素对SiO2的颗粒大小和形貌的影响.结果表明,正硅酸水解对醇溶剂是有选择性的,乙醇作为溶剂合成SiO2的单分散性和球形度最好.连续滴定和分步滴定更有利于单分散SiO2微球的形成.水解温度升高,生成的颗粒粒径将运渐增大,最佳反应温度为常温25℃或恒温水浴25～35℃.
이안수위최화제、정규산을지위규원、순위용제,채용개진적용효-응효공예제비단분산SiO2미구,통과소묘전경、격광립도분석의착중연구료정규산을지첨가방식、반응온도、용제류형등단인소대SiO2적과립대소화형모적영향.결과표명,정규산수해대순용제시유선택성적,을순작위용제합성SiO2적단분산성화구형도최호.련속적정화분보적정경유리우단분산SiO2미구적형성.수해온도승고,생성적과립립경장운점증대,최가반응온도위상온25℃혹항온수욕25～35℃.
Monodispersed silicon dioxide spherical particles are synthesized by improved sol-gel methods,using ammonia as catalyst, tetraethoxy silane(TEOS) as silica source and ethanol as solvent. The effect of adding method,reaction temperature,solvent types of TEOS on the particle size and morphology of silicon dioxide is studied by scanning electron microscope(SEM) and laser particle size analyzer. The results show that hydrolysis of ortho silicate is selective to alcohol solvent,monodispersity and sphericity of silicon dioxide are best using ethanol as solvent. continuous titration and stepwise titration are more beneficial to the formation of monodispersed silicon dioxide spherical particles.The particle size increases gradually with the rise of hydrolysis temperature, the best reaction temperature is room temperature 25℃ or constant temperature water bath 25～35℃.