盐对正负离子表面活性剂双水相性质的影响  

Influence of Salts on Aqueous Two-phase System of Cationic and Anionic Surfactant Aqueous Mixture

作　　者：滕弘霓[1] 王飞[1] 孙美娟[1] 张粟[1] 

机构地区：[1]青岛科技大学化学与分子工程学院,青岛266042

出　　处：《化学学报》2005年第17期1570-1574,F0006,共6页Acta Chimica Sinica

摘　　要：主要研究了盐对SDS/CTAB/H2O混合系统双水相相行为的影响,并对双水相上相的液晶性质进行了初步的探索.结果表明:盐能促使阴离子双水相区和阳离子双水相区分别向SDS和CTAB方向移动,并使双水相区加宽.反离子扩散双电层中盐的离子半径越大,其对ATPS区的位置及相区宽度的影响程度越大.盐的浓度达到一定值时,它对双水相的影响可以达到饱和状态.ATPSa区的饱和盐浓度值大于ATPSc区的饱和盐浓度值.异号盐离子对反离子层的限制作用与其离子半径有关.The effect of salt on the phase behavior of aqueous two-phase system （ATPS） formed by sodium dodecyl sulphate （SDS） and cetyl trimethyl ammonium bromide （CTAB） aqueous mixture has been studied. In the ternary phase diagram of 0.2 mol·L^-1 SDS/0.2 mol·L^-1 CTAB/H2O systems, there are two ATPS regions, which are called ATPSa region （containing more SDS） and ATPSc region （containing more CTAB）. When salt was added to the system, ATPSa region and ATPSc region moved towards SDS and CTAB respectively, and the width of each ATPS region was enlarged. The effect of salt would be saturated if the concentration of salt in system attain to certain value. It was easier to attain the saturated state in ATPSc than in ATPSa. The larger the radius of salt ion in the counter ion diffusion layer is, the stronger the effect on the position and the width of ATPS regions is. But the effect would be restricted by the opposite ion of salt.

关 键 词：双水相 正离子表面活性剂 负离子表面活性剂 液晶 电导 表面活性剂双水相 液晶性质 正负离子 盐 饱和状态 

分 类 号：O647.2[理学—物理化学]