Self-assembly Of cetyl trimethylammonium bromide in ethanol-water mixtures

• 来源期刊: 中国高等学校学术文摘·化学
• 关键词: dissipative particle dynamics cetyl trimethylammonium bromide micelle
• 年，卷（期）: 2006,（4）
• 页码范围: 438-442
• 页数: 5页
• 语种: 英文

摘要

The critical micelle concentration (CMC) of cetyl trimethylammonium bromide (CTAB) in both water and ethanol-water-mixed solvent was determined using steady- state fluorescence techniques in order to investigate the effect of the self-assembling properties of the surfactant on the template synthesis of porous inorganic materials.Results indicated that the CMC increased with the increase of ethanol concentration in the mixed solvent.The CMC of CTAB is 0.0009 mol/L in water,while it is 0.24 mol/L in ethanol.Furthermore,the dissipative particle dynamics (DPD) was adopted to simulate the aggregation of CTAB in water and ethanol/water mixtures,and the energy difference was calculated for the surfactant tail groups after mixing with the solvent.The simulation results reflected a regularity similar to the experimental data,i.e.,tail groups of CTAB interacted more strongly with ethanol than with water,which elucidates the reason that the micelle is difficult to form in ethanol.