物理化学学报 >> 1996, Vol. 12 >> Issue (08): 698-703.doi: 10.3866/PKU.WHXB19960806

研究论文 上一篇    下一篇

醋酸十二铵的吸附和SiO2悬浮液的稳定性

钱建刚,顾惕人   

  1. 北京航空航天大学化学教研室,北京 100083
  • 收稿日期:1996-01-15 修回日期:1996-03-26 发布日期:1996-08-15
  • 通讯作者: 钱建刚

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

摘要:

(1)测定了醋酸十二烷基铵(DAA)在CAB-O-SIL上的吸附,其等温线属双平台或LS型[1-3.5];(2)NaCl的存在使DAA的吸附增加.但不影响其低浓度下第一平台的吸附量;HCl的存在则在全浓度范围内抑制了DAA的吸附;(3)测定了CAB-O-SIL颗粒在上述各溶液中的悬浮液的稳定性;(4)根据表面形成小胶团的吸附理论(即二步模型产)[2,3,5],并借助电导跟踪溶液中发生的变化,满意地解释了吸附和聚沉的实验结果.

关键词: 醋酸十二烷基铵, 吸附, 表面胶团化, 二氧化硅, 聚沉, 悬浮液稳定性

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