1-萘胺探针研究Gemini表面活性剂的胶团性质

Micellar Properties of Gemini Surfactants Studied by 1-naphthylamine Probe

1-萘胺是一种具有分子内电荷转移特征的探针．由于它的荧光特征波长对环境极性的敏感性,其荧光发射波长-表面活性剂浓度(λ-lgc)曲线出现了2个浓度相距较大的转折点,第一个转折点对应临界胶团浓度(cmc),第二个转折点ccm则表征胶团结构达到较为密实的临界点．实验发现,Gemini表面活性剂在cmc时仅生成聚集数(N)较小的聚集体,在表面活性剂浓度从cmc增大至ccm的区间内,N急剧增大．

1-naphthylamine is a probe with intra-molecular charge transfer in nature. Its characteristic band （A） is sensitive to the polarity of environment. It was found that the semilogarithmic plot of A versus surfactant concentration （c） exhibited two inflection points. The first inflection point corresponded to the critical micelle concentration （cmc）, and the second inflection point （ccn） addressed the critical point reaching dense structure in the micellar core. The results showed that Gemini surfactant only forms small aggregates at the cmc. Over the range from cmc to ccmp the aggregation number of the micelle rapidly increases with increasing c.