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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. shu

Determination of Critical Micelle Concentration of Cetyltrimethyl-ammonium Bromide via Lineshape Parameter Analysis on Vis-Electronic Absorption Spectra

1.
Department of Chemistry, Guangzhou University, Guangzhou 510006

Corresponding author: ZHANG Jian-Hua,
Received Date: 12 March 2006
Available Online: 28 July 2006
Fund Project: 广东省科技计划项目资助(2003BL0708) (2003BL0708)

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.
- Cetyltrimethyl-ammonium Bromide(CATB),
- critical micelle concentration(cmc),
- vis-electronic absorption spectra,
- multi-peaks Gaussian fitting,
- half-width
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