Preparation and Characterization of High Solids Content Nano Silica Dispersions

• Main Authors: Kuan-yu Chou, 周冠宇
• Other Authors: Chorng-Shyan Chern
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/15341806610436171948

碩士 === 國立臺灣科技大學 === 化學工程系 === 98 === The objective of this work was to prepare and characterize transparent nanosized silica hydrosols using sodium silicate solution as the monomer, ultrapure water as the solvent, and acidic cation exchange resin ( IR120 ) to produce activated silicate acid. We studied the influence of initiator, pH, inhibitor, and the process of concentration on the particle size, colloidal stability and solids content of the silica hydrosols. We discussed nucleation and growth of silica hydrosols by altering the reaction conditions, and collecting samples during different growth times. As a result of this study, we presented the optimum reaction conditions and conversion rate to produce stabilized transparent nanosized silica hydrosols. This study showed that, when the pH of the silica sol in the range 9 to 10.5, the sol was very stable. Furthermore, the lower the pH, the higher the Zeta potential and, as a result, the better the sol stability. The silica dispersion can be further concentrated, to a higher solids content, and the maximum solids content was 30%.