Abstract
Supramolecular assemblies in ternary systems of alkyldimethylamine oxide (CnDAO,n= 12, 16)/cinnamic acid/D2O were investigated by small-angle neutron scattering. In the C12DAO/cinnamic acid/D2O system, prolate ellipsoidal micelles with axial ratios of 1.3 and 2.4 were formed at mixing molar ratiosX([cinnamic acid]/[CnDAO]) of 0 and 0.2, respectively. For the C16DAO/cinnamic acid/D2O system, lamellar layers with a bilayer thickness of 30 Å existed in a solution atX= 0, while rodlike micelles with a cross-sectional diameter of 50 Å were constructed atX= 0.2. Vesicles in solutions atX= 0.5–1 had multilamellar layers. The bilayer thickness was 23–30 and 35–36 Å for C12DAO/cinnamic acid and C16DAO/cinnamic acid vesicles, respectively. The thinner bilayer thickness suggests that the tilt or random orientation of alkyl chains may occur in lamellar bilayers and membrane bilayers. The comb-shaped arrangement is also possible in membrane bilayers by CnDAO/cinnamic acid complex.
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