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

SHI Hang; WANG Yujun; LUO Guangsheng

doi:10.3969/j.issn.0438-1157.2013.02.041

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

更新时间：2025-12-10

- Preparation of silica microspheres with bimodal pore structure in micro-channel
- CIESC Journal Issue 2, Pages: 711-717(2013)
- 作者机构：
  
  清华大学化学工程系,化学工程联合国家重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.02.041
  CLC： B321
- Online First：05 February 2013，
  
  Published：05 February 2013
- 稿件说明：
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SHI Hang, WANG Yujun, LUO Guangsheng. Preparation of silica microspheres with bimodal pore structure in micro-channel[J]. CIESC Journal, 2013, (2): 711-717.
DOI：

SHI Hang, WANG Yujun, LUO Guangsheng. Preparation of silica microspheres with bimodal pore structure in micro-channel[J]. CIESC Journal, 2013, (2): 711-717. DOI： 10.3969/j.issn.0438-1157.2013.02.041.

摘要

利用微流控技术制备双重孔结构SiO2微球具有微观结构和宏观形貌可控的优点。在同轴环管微通道中

通过pH和温度变化引发快速凝胶过程制备得到了具有双重孔结构的SiO2微球

考察了有机相溶剂性质、有机相流速以及凝胶温度等因素对微球宏观形貌以及微观结构的影响规律。实验结果表明

制备得到的SiO2微球粒径在300～600 μm可调

比表面积可以达到1000 m2·g-1

介孔孔径在4～10 nm之间

大孔孔径在400～1500 nm之间。实验发现有机相流速的增大会导致微球粒径的减小

提高三辛胺对盐酸的萃取速率

加快二氧化硅溶胶粒子的凝胶过程

更易生成松散的网状大孔结构。较高的凝胶温度会增大SiO2微球介孔的孔容和孔径。

Abstract

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.

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