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