Aggregation behavior of an amino acid-derived bolaamphiphile and a conventional surfactant mixed system.
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.
Chen
Yuxia
Y
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, People's Republic of China.
Liu
Yan
Y
Guo
Rong
R
D000596:Amino Acids / Q000737:chemistry; D003959:Diamines / Q000737:chemistry; D019281:Dimerization; D006639:Histidine / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013057:Spectrum Analysis; D013501:Surface-Active Agents / Q000737:chemistry*
D000596:Amino Acids; D003959:Diamines; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; C016417:1,12-dodecamethylenediamine; D006639:Histidine; C022806:dodecyltrimethylammonium