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中文摘要：
以工业硅酸钠为原料、盐酸为沉淀剂、聚乙二醇（PEG）为表面活性剂、硅烷偶联剂γ-（甲基丙烯酰氧）丙基三甲氧基硅烷（KH570）为改性剂，在复合剪切力场下，用化学沉淀法制备了纯纳米SiO2和原位进行改性的改性纳米SiO2。分析了乙醇与水体积比、硅酸钠浓度、盐析剂用量、溶液pH值、改性方法、表面活性剂或改性剂的加入量等对纳米SiO2型貌的影响。对制备纳米SiO2的配方进行了优化，用透射电子显微镜（TEM）和粒径分析仪等对产品进行表征。结果表明，复合剪切力场下化学沉淀法制备纳米SiO2的优化配方为：乙醇与水的体积比1：4，硅酸钠的质量分数约12％，PEG，KH570和氯化钠的质量约为理论制备纳米SiO2所需质量的40％．5％～10％和30％，最佳pH值约等于9。
英文摘要：
With industrial-grade sodium silicate as precursor material, HCI as precipitating agent, polyethylene glycol （PEG） as surfactant and silica coupling agent （γ-Trimethoxysilyl-propyl- methacrylate, KH570） as modifier, net and modified nanosilica（nano-SiO2）were prepared by chemical precipitation method and in situ modification respectively under multiple shear force field. The influence of ethanol and water volume ratio, sodium silicate concentration, salt dosage, pH value of the solution, modification methods, surface active agent or other modifier dosages on the appearance of nano-SiO2 were analyzed and the preparation of nano-SiO2 formula was optimized. The resultant materials were characterized by transmission electron microscope （TEM） and laser particle size analyzer. The results showed that the optimized formulation of the nano-SiO2 prepared by chemical precipitation method under multiple shear force field were the ethanol and water volume ratio 1：4, the quality fraction of sodium silicate about 12 %, the quality of PEG, KH570 and sodium chloride respectly 40 %, 5 % - 10 % and 30 % of the theoretical required quality and the best pH value about 9.
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