Droplet-based microfluidics for emulsion and solvent evaporation synthesis of monodisperse mesoporous silica microspheres
Droplet-based microfluidics for emulsion and solvent evaporation synthesis of monodisperse mesoporous silica microspheres
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DOI：
10.1021/la7032516
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发表时间：
2008-02-05
期刊：
影响因子：
3.9
通讯作者：
Petsev, Dimiter N.
中科院分区：
文献类型：
--
作者：
Carroll, Nick J.;Rathod, Shailendra B.;Petsev, Dimiter N.
提出了一种制备单分散介孔氧化硅颗粒的新方法。它是基于使用微流体方法形成定义明确的相等大小的乳液液滴。液滴含有二氧化硅前体/表面活性剂溶液，并悬浮在作为连续油相的十六烷中。然后溶剂从液滴中排出，导致表面活性剂的浓缩和胶束化。同时，二氧化硅在表面活性剂结构周围固化，形成相同尺寸的中孔颗粒。可以调整该过程以产生分离良好的颗粒或连接在一起的颗粒。后者允许我们创建具有分层孔隙度的2D或3D结构。
A novel method for the fabrication of monodisperse mesoporous silica particles is suggested. It is based on the formation of well-defined equally sized emulsion droplets using a microfluidic approach. The droplets contain the silica precursor/surfactant solution and are suspended in hexadecane as the continuous oil phase. The solvent is then expelled from the droplets, leading to concentration and micellization of the surfactant. At the same time, the silica solidifies around the surfactant structures, forming equally sized mesoporous particles. The procedure can be tuned to produce well-separated particles or alternatively particles that are linked together. The latter allows us to create 2D or 3D structures with hierarchical porosity.