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Preparation of the Silica Micro-Spheres by Chemical Precipitation Process

机译：化学沉淀过程制备二氧化硅微球

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Silica micro-spheres were prepared from sodium silicate at room temperature with ethyl acetate as the precipitant. The effect of process parameters on the yield and the morphology of SiO_2 powders was systematically investigated and the optimum reaction condition was confirmed as follows: the concentration of sodium silicate was 0.6 mol/L, the total addition amount of the blend surfactants of PEG-1000 and sodium dodecyl benzene sulfonate (SDBS) was 2.1% and the blend ratio was 20:1, the addition amount of ethanol and ethyl acetate were 5.0% and 8.0%, respectively, the stirring rate was 600 rpm and the reaction time was 4.0 hours. The average particle size was 400 nm and the yield was 93.8%. The product was characterized by scanning electron microscope, Infrared Spectroscopy, and X-ray powder diffraction.
机译：在室温下用硅酸钠用乙酸乙酯作为沉淀剂制备二氧化硅微球。系统地研究了工艺参数对产量和形态的影响，得到了优化的最佳反应条件：硅酸钠的浓度为0.6mol / L，PEG-1000的共混物表面活性剂的总添加量和十二烷基苯磺酸钠（SDB）为2.1％，混合比为20：1，乙醇和乙酸乙酯的添加量分别为5.0％和8.0％，搅拌速率为600rpm，反应时间为4.0小时。平均粒径为400nm，产率为93.8％。该产品的特征在于扫描电子显微镜，红外光谱和X射线粉末衍射。

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