ISSN:
1435-1536
Keywords:
Zwitterionic surfactants
;
vesicles
;
lamellar phase
;
X-ray diffraction
;
dispersion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract New double-chain zwitterionic surfactants were shown to undergo spontaneous dispersion as vesicles in water by means of simple dilution of the lamellar phase. The molecular parameters of relevance were investigated in a systematic study of the structure of the lamellar phase and of the ability of spontaneous formation of vesicles in a series of homologous zwitterionic surfactants. Thus, the double-chain zwitterionic surfactants which occupies a small interfacial area per molecule in spite of the large size of their hydrophilic headgroup can form spontaneous vesicles. In this case, the bending modulus ¯k of the surfactant film is strongly negative and the short-range repulsive interactions between hydrophilic groups protruding from the surfactant films into water allow a large swelling of the lamellar phase, and are the origin of the colloidal stability of the vesicles dispersion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188955
