Acoustic and electroacoustic spectroscopic determination of the critical coagulation concentration for the aggregation of fumed silica

作者：Burnett Steven S^*; Mitchell James W

来源：Journal of Sol-Gel Science and Technology, 2015, 74(3): 661-669.

DOI：10.1007/s10971-015-3645-0

• Sol-gel
• Critical coagulation concentration
• Acoustic and electroacoustic spectroscopy
• Fumed silica

Acoustic and electroacoustic spectroscopy were use to model varying concentrations of NH4Cl in a 25 wt% fumed silica suspension for interpretation and visualization of the critical coagulation concentration (CCC) needed to induce coagulation of the suspension. The acoustic data indicates a range for the CCC that agrees with Derjaguin and Landau, Verwey and Overbeek theory and experimental results found in literature. The electroacoustic data suggest a power law relationship between NH4Cl concentration and changes in the colloidal vibrational current, and predicts that 0.M-4 is the CCC for NH4Cl in a fumed silica suspension.

• 出版日期2015-6