【摘要】 报道可见吸收光谱线型的高斯多峰拟合计算,用于研究非离子表面活性剂吐温-80（Polysorbate 80,简称Tween80）和阴离子表面活性剂十二烷基苯磺酸钠（sodium dodecyl benzene sulfonate,SDBS）混合水溶液中的聚集行为。以孔雀石绿（malachite green,MG）为探针,测量一系列不同浓度的Tween80-SDBS-MG水溶液的可见吸收光谱,其特征是MG单体吸收峰（619～632）nm和二聚体吸收峰（590～606）nm叠合在一起。用Origin软件频谱分析软件包高斯多峰拟合法,计算出体系可见光谱吸收叠合峰的分峰、峰面积（积分吸光度）、频移及半高宽等光谱的线型参数;单体和二聚体峰面积比（相对积分吸光度A₂/A₁）、频移（Δλ）及半高宽（w₁,w₂）使Tween80或SDBS浓度图形,在临界胶束浓度cmc处发生突变。首次发现体系可见吸收光谱线型参数半高宽对吐温-80-十二烷基苯磺酸钠混合表面活性剂相互作用和聚集行为敏感,并成功用于研究该混合表面活性剂体系的聚集行为。更多还原

【Abstract】 A multi-peaks gaussian fitting on lineshape of vis-spectra is used to study aggregation behavior of mixed surfactant aqueous system of Polysorbate 80 and Sodium Dodecyl Benzene Sulfonate.Vis electronic absorption spectra of a serials of different concentration Polysorbate 80 and SDBS with Malachite Green（MG） used as probe are measured respectively and characterized by overlap of principal adsorption withλ_max occurs in（619～632）nm and a shoulder occurs in（590～606）nm assigned to monomer and dimer MG respectively. A multi-peaks gaussian fitting is done to interpret the spectra and gives relative integrating absorbance（A₂/A₁）,red-shift （△λ） and half-width of MG monomer and dimer peaks.A sudden change occurs at cmc in the curves of the relative integrating absorbance （A₂/A₁）,red-shift（△λ） and half-width（w₁,w₂） versus the Polysorbate 80 and SDBS surfactant concentrations.Significantly the dependence of the cmc upon the half-width is firstly observed and successfully used to determine critical micelle concentration （cmc） of mixed surfactant aqueous system of Polysorbate 80 and Sodium Dodecyl Benzene Sulfonate.更多还原