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  Global Journal of Physical Chemistry. Volume 2, Issue 1 (2011) pp. 34-38
  Research Article
Determination of critical micelle concentration of binary surfactant mixtures using UV-vis spectrophotometry and Gaussian fitting method
  Xiaoge Li, Jianhua Zhang*, Zhaoqing Liu, Shuang Chen, Yuzhi Su, Changwei Xu*  
School of Chemistry and Chemical Engineering, Guangzhou University , Guangzhou 510006, China

A multi-peak Gaussian fitting method is successfully used to distinguish two absorption peaks in UV-vis absorption spectrum. The multi-peak Gaussian fitting method for UV-vis absorption spectrum is a good method to determine critical micelle concentration (CMC) of surfactant. The values of CMC are 0.151, 0.164 and 0.181 mM for sodium dodecylbenzene sulfonate (SDBS) at the concentrations of n-decyl-β-D-glucopyranoside (DGS) and aniline green (AG) fixed as 1.0 and 0.025 mM, which are determined by a ratio of integrated absorbance of AG monomer absorption peak to AG dimer absorption peak (A1/A2), a wavelength shift of absorption peaks (Δλ) and a half-width (w1,w2) of absorption peaks , respectively. The CMC is similar around the room temperature from 306.2 to 327.2 K.

  Surfactant mixtures; critical micelle concentration; UV-vis absorption spectrophotometry ; multi-peak Gaussian fitting method  

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