Preparation of Nanometer Silica by Freeze-Drying Chemical Precipitation Method

• Main Authors: Shanshan Jin, Xuehui Rui, Yingping Qi, Hua Li
• Format: Article
• Language: English
• Published: PURKH 2018-04-01
• Series: To Chemistry Journal
• Subjects: nanoscale; reverse titration
• Online Access: https://www.purkh.com/index.php/tochem/article/view/63

Nanometer SiO2 with different sizes and shapes is synthesized by coprecipitation technique using sodium silicane as Si source, ammonium chloride as precipitant, ethanol as dispersant, CTAB as regulator. Nanometer SiO2 is obtained from the titration precipitation method and reverse titration precipitation method, respectively．Morphology size distribution and structure of SiO2 particles is characterized by laser particle size analyzer ,microscope and FTIR.The results show that the optimum condition of synthesizing nanometer SiO2 were as follows, the concentration of sodium silicane was 0.4 mol/L, volume ratio of ethanol to water was1:8,pH value was 8.5, concentration of CTAB was 6mmol/l.Spherical silica particles ranging from 3 to 6nm are prepared by the method of reverse titration precipitation and freeze-drying.