In situ preparation of hydrophobic CaCO_3 nanoparticles in a gas-liquid microdispersion process  

作　　者：Le Du Yujun Wang Guangsheng Luo 

机构地区：[1]The State Key Laboratory of Chemical Engineering,Department of Chemical Engineering,Tsinghua University

出　　处：《Particuology》2013年第4期421-427,共7页颗粒学报（英文版）

基　　金：supports of the National Natural Science Foundation of China(21036002 and 20876084);National Basic Research Program of China(2007CB714302)

摘　　要：This study presents a novel process of in situ surface modification ofCaCO3 nanoparticles using a multiple- orifice dispersion microreactor. CO2/Ca（OH）2 precipitation reaction was employed to prepare CaCO3 nanoparticles with sodium stearate surfactant. Synthesized CaCO3 products were characterized by ther- mogravimetric analysis （TGA）, infra-red （IR）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Brunauer-Emmet-Teller analysis （BET）. The effect of various operation parameters on nanopar- ticles and the dosage of sodium stearate were determined. The results showed that the preparation process could be precisely controlled with efficient mass transfer process. The particles were highly hydropho- bic with a contact angle of 117~ and monodisperse with an average size of 30 nm. The adsorptions of sodium stearate and calcium ion on solid particles during the in situ surface modification process were investigated.This study presents a novel process of in situ surface modification ofCaCO3 nanoparticles using a multiple- orifice dispersion microreactor. CO2/Ca（OH）2 precipitation reaction was employed to prepare CaCO3 nanoparticles with sodium stearate surfactant. Synthesized CaCO3 products were characterized by ther- mogravimetric analysis （TGA）, infra-red （IR）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Brunauer-Emmet-Teller analysis （BET）. The effect of various operation parameters on nanopar- ticles and the dosage of sodium stearate were determined. The results showed that the preparation process could be precisely controlled with efficient mass transfer process. The particles were highly hydropho- bic with a contact angle of 117~ and monodisperse with an average size of 30 nm. The adsorptions of sodium stearate and calcium ion on solid particles during the in situ surface modification process were investigated.

关 键 词：CaCO3 nanoparticlesIn situ surface modificationMicroreactorMass transfer 

分 类 号：O614.231[理学—无机化学] TB383.1[理学—化学]