引用本文:
张建华, 杨瑜蓉, 张水凤. 吸收光谱线型分析用于十六烷基溴化铵临界胶束浓度的测量[J]. 应用化学,
2007, 24(3): 306-309.
Citation: ZHANG Jian-Hua, YANG Yu-Rong, ZHANG Shui-Feng. Determination of Critical Micelle Concentration of Cetyltrimethyl-ammonium Bromide via Lineshape Parameter Analysis on Vis-Electronic Absorption Spectra[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 306-309.
Citation: ZHANG Jian-Hua, YANG Yu-Rong, ZHANG Shui-Feng. Determination of Critical Micelle Concentration of Cetyltrimethyl-ammonium Bromide via Lineshape Parameter Analysis on Vis-Electronic Absorption Spectra[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 306-309.
吸收光谱线型分析用于十六烷基溴化铵临界胶束浓度的测量
摘要:
以曙红(Eosin Y简称EY)染料为探针,测量一系列不同浓度的CTAB-EY水溶液体系可见吸收光谱,其光谱特征为EY最大吸收峰529~532nm和肩峰506~508nm叠合在一起,用Origin软件频谱分析软件包中的高斯多峰拟合工具实现了体系可见吸收光谱叠合峰的分峰拟合计算,给出了吸收峰线型参数峰面积(积分吸光度)、频移及半高宽;最大吸收峰与肩峰面积比(相对积分吸光度A2/A1)、频移(△λ1,△λ2)及半高宽(w1,w2)对CTAB浓度图形在cmc处发生突变。观察到可见吸收光谱半高宽对表面活性剂浓度的敏感性,并成功应用于cmc测定。
English
Determination of Critical Micelle Concentration of Cetyltrimethyl-ammonium Bromide via Lineshape Parameter Analysis on Vis-Electronic Absorption Spectra
Abstract:
A spectrophotometric method was used to determine the critical micelle concentration of cetyltrimethyl-ammonium bromide cationic surfactant. Vis-electronic absorption spectra of a series of CTAB solutions with different concentrations were measured with EY as the probe and characterized by the overlap of the principal peak at 529~532 nm and a shoulder at 506~508 nm. A multi-peak Gaussian fitting was used to interpret the spectra and gave relative integrated absorbance(A2/A1) of the two peaks, red-shift(Δλ1, Δλ2) and half-width. A sudden change occurs at cmc in the curves of relative integrated absorbance(A2/A1), red-shift(Δλ1, Δλ2) and half-width versus the concentration of CTAB. Significantly the dependence of the cmc upon the half-width was observed and used in the determination of cmc of cationic surfactant such as CTAB.
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