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CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.40: Poster

Monday, March 24, 2003, 19:00–21:00, ZEU/250

CMC determination of different surfactants by Fluorescence Correlation Spectroscopy — •Heiko Zettl¹, Moshe Gottlieb², and Georg Krausch¹ — ¹Physikalische Chemie II, Universität Bayreuth — ²Chemical Engineering Department, Ben-Gurion University Beer Sheva

The formation of micelles of SDS, AOT, CTAC, and C12E5 have been studied by Fluorescence Correlation Spectroscopy (FCS). From FCS experiments the translational diffusion coefficient, hydrodynamic radii, and the critical micelle concentration (cmc) is determined. As label for our experiments we use several commercial dyes. The detected cmc is similar to values reported in literature. The size of the detected micelles is bigger than the reported values. The reason for this difference may be the additional dye molecule. The results show that their is no need to synthesize labeled surfactant molecules for determination of surfactants by FCS. Moreover, our results indicate that the charge of the surfactant head group and the polarity of the dye molecules need to be adapted for successful CMC determination.