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化工学报  2015 

液滴界面可控导入沉淀剂制备单分散均匀微球

DOI: 10.11949/j.issn.0438-1157.20150919, PP. 3654-3660

Keywords: 介尺度,界面,制备,微流控,液滴,微球,单分散

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Abstract:

均一尺寸微米功能材料在诸如高分子化学、医药化工、催化以及高效分离等领域都受到普遍关注。现有常规方法很难满足制备单分散、均一性的微米材料的要求。采用微流控技术,在微流控芯片内先生成液滴,然后再在线固化液滴的方法,制备了各种单分散、尺寸均一的微球。通过液滴界面受控导入沉淀剂到液滴中,当所含溶质为固化慢的硅溶胶时,生成实心微球,制备得到表面积达572m2·g-1、直径变异系数约为2%的纳米孔道二氧化硅微球;当液滴内含沉淀固化较快的溶质,如Zn、Fe、Cu,则可形成水合氧化物或者混合氧化物空心球微球;当含快沉淀也含慢速固化物质时,如含可溶性Fe的硅溶胶时,通过调控沉淀剂进入液滴的速度,也成功了制备了Fe均匀分散在氧化硅内的混合氧化物微球。

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