表面单分子膜的垂悬液滴方法研究

STUDY OF USING PENDANT DROP TECHNIQUE IN LANGMUIR BLODGETT FILMS

提出一种扩展或收缩气／液界面单分子层的分子密度，用荧光成像技术检测单分子层的扩展或收缩效果的新方法———垂悬液滴分析方法．此方法通过改变液滴体积，对液滴界面上的表面活性剂分子实施扩展和收缩，具有ＬａｎｇｍｕｉｒＢｌｏｄｇｅｔ（ＬＢ槽）的功能．对表面活性剂荧光分子，用液滴的激光感生荧光图像，可以实时测量液滴界面的相对分子密度变化；用偏振荧光分析技术，可获取荧光偶极矩在液滴界面的相对取向．对罗丹明（Ｂ）表面活性剂分子ＯＤＲＢ的实验结果表明：１）表面单分子层分子密度在压缩过程中遵循σ／σ０＝（Ｄ０／Ｄ）２规律；２）ＯＤＲＢ分子是以接近“平躺”

Abstract The pendant drop technique has been used to compress and expand the monolayer film,both the surface density of surfactant molecules and surfactant orientation on the surface of a pendant drop can be determined with polarized fluorescent image for the surfactant molecules which has a chromophore.The experiment on octadecyl Rhodamine B(ODRB) molecules shows that:(1) The surface density of ODRB follows the formula σ/σ 0=(D 0/D) 2 in the compressing process.(2) The ODRB molecules are absorbed on the surface of pendant water drop in the way of lying flat.(3) The pendant drop method is a reliable and convenient technique for compressing the surface density of surfactant molecules.