Hydrolysis of silica sources: ASP and DTSACI in microencapsulation processes
| 1 | Jerzy Haber Institute of Catalysis and Surface Chemistry |
| 2 | SINTEF Material and Chemistry |
CORRESPONDING AUTHOR
Krzysztof Szczepanowicz
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezpominajek st. 8, Krakow 30-239, Poland
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezpominajek st. 8, Krakow 30-239, Poland
Publication date: 2012-06-01
Physicochem. Probl. Miner. Process. 2012;48(2):403–412
KEYWORDS
ABSTRACT
The process of formation of silica shells around emulsion droplets was investigated. The 1H-NMR spectroscopy was applied to follow the silica shell formation around emulsion droplets by hydrolysis and condensation of selected silanes in the emulsion system. (3- aminopropyl) triethoxysilane (APS) and dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (DTSACl) were used as silica sources in microencapsulation process. The NMR analysis revealed strong dependence of the hydrolysis reaction rate on pH. Obtained information allowed selecting the optimal conditions for the formation of the capsules with silica shells. The obtained capsules’ suspensions were stable for several weeks.
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