Monatshefte fur Chemie p. 585 - 592 (1997)
Update date:2022-08-11
Topics:
Iwunze
Lambert
Silversmith
A combination of fluorimetric and viscosimetric methods was used to characterize N,N-dimethyl-N-2-(4-(t-butylphenoxy)ethoxy)ethyl-N-hexadecylammonium chloride (BDHC), a double-tailed surfactant with dissimilar tail groups. BDHC was observed to fluoresce at 315 nm when excited at 274 nm, a feature which could be utilized to determine its critical micelle concentration (CMC). A value of 3.98 × 10-5 M was obtained and was observed to be slightly temperature dependent with a Tmin of 25.35°C. Fluorescence quenching experiments using 4-nitroaniline as a quencher were performed in order to determine the aggregation number which was found to be 42.0. The hydrodynamic radius of 21.91 A was obtained using data from viscosimetric experiments. These data, together with the Tanford and Einstein-Stokes relationships, were used to determine the micellar structure (spherical) and the diffusion coefficient (D = 0.97 × 10-6cm2/s), respectively. The ΔG of micellization for BDHC was determined to be -34.9kJ/mol.
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