Journal of Colloid and Interface Science 2009-08-15

Aggregation behavior of an amino acid-derived bolaamphiphile and a conventional surfactant mixed system.

Yuxia Chen, Yan Liu, Rong Guo

Index: J. Colloid. Interface Sci. 336(2) , 766-72, (2009)

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Abstract

The aggregation behavior of a mixed system consisting of a novel histidine-derived bolaamphiphile 1,12-dihistidine diaminododecane (H(2)D) and the conventional surfactant dodecyltrimethylammonium bromide (DTAB) has been investigated. The microstructure of the H(2)D/DTAB mixture has been identified by means of negative staining-TEM, dynamic light scattering (DLS), fluorescence spectra, FT-Raman spectroscopy, and differential scanning calorimetry (DSC). Rich morphologies are observed in the mixed system of H(2)D and DTAB over a relatively wide proportion range. At C(DTAB)/C(H2D)<12:1, vesicles are formed in the mixed system. At C(DTAB)/C(H2D)>12:1, vesicles and tube-like aggregates coexist, and more tube-like aggregates appear with further increase of C(DTAB)/C(H2D). The formation mechanisms of the aggregation with various morphologies at different C(DTAB)/C(H2D) ratios are further deduced.