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《Materials Science and Engineering of Powder Metallurgy》 2011-02
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Study on factors of particle size and distribution of silica sol

HE Han-wei,ZHAO Shi-wei,JIA Shou-ya (State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)  
Using potassium hydroxide as catalyst,silica sol was prepared through silicon dissolution method.The morphology,particle size and size distribution of colloidal particle were characterized by means of scanning electron microscope(SEM),laser size distribution analyzer(SL),pH and viscosity measurements.On this basis,effects of reaction temperature,dosage of silica powder,dosage of potassium hydroxide,reaction time on particle size,size distribution and morphology were investigated,and the theories of crystal growth were also explored.The results show that: with the increasing of reaction temperature,mean particle size firstly increases then decreases,particle size dispersity firstly decreases then increases;with the increasing of silica powder dosage,mean particle size exhibits firstly increasing then decreasing trend,particle size dispersity firstly increases then decreases;with the increasing of potassium hydroxide dosage mean particle size of silica sol exhibits firstly increasing then decreasing trend,particle size dispersity is invariable;with the extension of reaction time,mean particle size increases,particle size dispersity gradually increases,when the time is 10 h,colloidal particles appear conglomeration;the morphology of silicon dioxide appears spherical.
【CateGory Index】: O613.72
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