罗丹明B对表面活性剂溶液表面张力的影响

The effect of RB on surface tension in different surfactant solutions

采用最大气泡压力法,在十六烷基三甲基溴化铵(CTAB)、十二烷基硫酸纳(SDS)、十二烷基苯磺酸纳(SDBS)、十二烷基苯磺酸(DBSA)和壬基酚聚氧乙烯醚(Oπ-10)所形成的胶束水溶液中,测定了加入罗丹明B(RB)前后溶液表面张力随表面活性剂浓度的变化规律.结果表明:RB与各表面活性剂之间存在不同程度的相互作用,由于RB是阳离子染料,它与阴离子表面活性剂的静电作用比较强;RB的加入对不同表面活性剂的临界胶束浓度(cmc)的影响较小,但是对表面张力的影响却很大.

Surfactants CTAB, SDS, SDBS, DBSA, and Oπ- 10 with difference concentrations were mixed with rhodamine B,and the surface tensions of single and mixed systems were determined by the largest air bubble method. The experiments has shown that the surface tension curves of the surfactants in the presence of RB has changed compared with those in the absence of RB, but the apparent critical micelle concentrations （cmc） of the surfactants haven＇t been changed almostly.