Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (08): 698-703.doi: 10.3866/PKU.WHXB19960806

• ARTICLE • Previous Articles     Next Articles

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

Qian Jian-Gang,Gu Ti-Ren   

  1. Laboratory of Chemistry,Beijing University of Aeronautics and Astronautics,Beijing 100083
  • Received:1996-01-15 Revised:1996-03-26 Published:1996-08-15
  • Contact: Qian Jian-Gang

Abstract:

(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.

Key words: Dodecylammonium acetate, Adsorption, Surface micellization, Silica, Coagulation, Stability of suspension