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Preparation of Nano and molten silica particles of micron

Author: ZhouWei
Tutor: HanJianJun；ZhaoXiuJian
School: Wuhan University of Technology
Course: Optoelectronic information materials
Keywords: Melting method Silica fine particles Sodium borosilicate glass system Glass phase separation
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 46
Quote: 0
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Abstract


This experiment is the use of Na2O-B2O3-SiO2 glass as precursors to the glass based on the principle of the phase , and with a certain concentration of acid solution of soluble component obtained structure micron silica particles . The resulting silica particles have a large surface area , shape stability, resistance to chemical attack , etc., since the discovery of antimicrobial , chromatography , immobilized enzymes and fiber-optic communications, and other aspects have a very wide range of applications . Experimental system mainly sodium borosilicate glass , based on its selection of the phase composition of a region , the use of heat treatment and acid treatment to obtain silica fine particles , using differential scanning calorimetry of the pre-heat treatment Na2O-B2O3-SiO2 glass testing , the use of X-ray diffraction analysis of different heat treatment temperatures Na2O-B2O3-SiO2 glass were analyzed , and then field emission scanning electron microscopy after acid leaching of silica particles morphology characterization. Using the test parameter to analyze the temperature and time of heat treatment , acid treatment temperature and time and the original properties of the glass composition of the silica fine particles . For the preparation of spherical morphology, narrow pore size , pore size adjustable to provide the basis of the silica particles . The results show that the glass component is 5Na2O-35B2O3-65SiO2 glass , the heat treatment temperature and time in a range of silica fine particles contribute to the formation increases , the optimum heat treatment temperature range is 530-610 ℃, optimum heat treatment time of 6h. Low concentrations of fine particles obtained by the acid treatment is better morphology , extending the acid treatment time can increase acid treatment efficiency. Although addition of titanium ions inhibit phase separation process can be very good , but control of the phase of boron and silicon enriched areas and each form , with the size distribution and concentration beneficial . By orthogonal test for MNS2 component samples, the optimal heat treatment condition of 580 ℃, 6h, the optimal conditions for acid treatment of 1mol / L HCl, 24h. The silica fine particles obtained with regular morphology , specific surface area, the advantages of better dispersion .

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