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Citation: Qian Jian-Gang, Gu Ti-Ren. Effect of Adsorption and Surface Micellization of Dodecylammonium Acetate on the Stability of Silica Suspension[J]. Acta Physico-Chimica Sinica, ;1996, 12(08): 698-703. doi: 10.3866/PKU.WHXB19960806 shu

Effect of Adsorption and Surface Micellization of Dodecylammonium Acetate on the Stability of Silica Suspension

1.
Laboratory of Chemistry,Beijing University of Aeronautics and Astronautics,Beijing 100083

Received Date: 15 January 1996
Available Online: 15 August 1996

(1) The adsorption of dodecylammonium acetate (DAA) on CAB-O-SIL has been investigated, the adsorption isotherm of DAA shows two plateaus (i.e. LS-type). (2) The addition of sodium chloridc increases the adsorption of DAA, but no significant change can be found in the first plateau at low concentrations; while the addition of hydrochloric acid decreases the adsorption of DAA in the experimental concentration region. (3) The stability of CAB-O-SIL suspension has been determined for the corresponding solutions. (4)Based on the two-step model of the surfactant adsorption theory proposed previously, and with the aid of conductivity measurements, the coagulation regularity of CAB-O-SIL suspension can be explained satisfactorily.
- Dodecylammonium acetate,
- Adsorption,
- Surface micellization,
- Silica,
- Coagulation,
- Stability of suspension
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