Preparation of silica microspheres with bimodal pore structure in micro-channel

被引：0

作者：

Shi, Hang ^{[1
]}

Wang, Yujun ^{[1
]}

Luo, Guangsheng ^{[1
]}

机构：

[1] State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University

来源：

Huagong Xuebao/CIESC Journal | 2013年 / 64卷 / 02期

关键词：

Bimodal pore structure; Mass transfer; Micro-channel; Silica microsphere;

D O I：

10.3969/j.issn.0438-1157.2013.02.041

中图分类号：

学科分类号：

摘要：

Using microfluidic technology to prepare silica microspheres with a bimodal pore structure can easily control pore structure and morphology. The silica microspheres with a bimodal pore structure were prepared by adjusting pH and temperature to improve gelation rate in the co-axial micro-channel. The effects of oil phase properties, flow rate of oil phase and gelation temperature on morphology and microstructure of the microspheres were investigated. Experimental results showed that the diameter of silica microspheres could be controlled between 300-600 μm, the specific surface area was about 1000 m2·g-1, the pore diameter of mesopores was about 4-10 nm, and the pore diameter of macropores was about 400-1500 nm. Increase of flow rate of oil phase decreased particle size, accelerated rate of extraction of trioctylamine to hydrochloric acid, and then sped up the process of silica particle gel, making it easier to generate a loose mesh macroporous structure. High gelation temperature increased pore volume and pore size of the mesoporous pores. © All Rights Reserved.

引用

页码：711 / 717

页数：6

共 16 条

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