醇对SDS-CTAB-H2O体系双水相性质的影响

研究了短链一元醇(乙醇、正丁醇)和二元醇(乙二醇、1，4—丁二醇)对正负离子表面活性剂混合溶液(十二烷基硫酸钠—十六烷基三甲基溴化铵—水)双水相的影响。结果表明：一元醇的加入不但缩短了双水相的成相时间、使原水溶液双水相的区域得到扩展而且还会导致新双水相区域的出现，这种影响随着醇类链长的增长而增大。而二元醇的加入对双水相的相图影响不大，只是对形成双水相的表面活性剂最低总浓度稍有影响。实验结果也表明，出现双水相的表面活性剂最低总浓度与混合溶液的临界胶束浓度(CMC)有关，但CMC并不是决定出现双水相表面活性剂最低浓度的唯一因素。

The Effect of Various Alcohols on the Aqueous Two-phase System of Cationic and Anionic Surfactants

The effect of short chain monohydric alcohols (ethanol, n-butanol) and dihydric alcohols (ethyleneglycol, 1,4-butanediol) on the aqueous two-phase system (ATPS) of cationic and anionic surfactants (SDS-CTAB) is studied. Results show that the additions of monohydric alcohols can not only shorten the phase separation time, expand the regions of ATPS but also cause the formation of a new kind of ATPS compared with original aqueous solutions. At the same time the effect becomes more obvious when the chain length of alcohol is getting longer. However, the dihydric alcohols have little effect on the diagram of ATPS. Experimental results also show that the CMC of the mixed solution has something to do with the lowest concentration of surfactants under which the ATPS can form, but CMC is not the only factor.