表面活性剂对HPTS荧光光谱的影响

Influence of Surfactants on Fluorescence Spectra of 8-Hydroxy-1,3,6-Pyrenetrisulfonate

表面活性剂对8-羟基-1,3,6-芘三磺酸钠(HPTS)荧光光谱的影响,随表面活性剂类别而异,显示出明显的电性选择性。阳离子表面活性剂CTAB和TPC(或CPC),因化学结构不同,对HPTS荧光的影响亦截然不同。后者无论浓度大小,对HPTS荧光仅产生猝灭作用。CTAB的影响呈现出单分子猝灭(C_(CTAB)<cmc)和胶束作用(C_(CTAB)>cmc)两个特徵,随C_(CTAB)逐渐增大,经历着荧光猝灭、荧光峰位红移和强度回升,以及新峰显示等过程。两性表面活性剂DDAPS的影响与CTAB有某些类似之处。,阴离子表面活性剂SDS因电性与HPTS阴离子电性不相容,对HPTS荧光光谱不产生明显影响。非离子表面活性剂TritonX-100的影响仅表现为微环境极性变化。由于HPTS仅定域在其胶束表面,微环境极性的改变以及由此引起的HPTS荧光光谱的变化相对要小得多。

The influence of various surfactants on fluorescence spectra of 8-hydroxy-1, 3, 6-pyrentrisulfonate is investi-gated. The influence changes with the kind of surfactant and shows distinctive electric selectivity. Both CTAB and TPC (or CPC)are cation surfactants,but their influences are quite different because of different chemical structure.