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Palazzo, G. et al.

Palazzo, Fiorentino, Colafemmina, Ceglie, Carretti, Dei, Baglioni,

Nanostructured fluids based on propylene carbonate/water mixtures.

The microstructure of aggregates formed by sodium dodecyl sulfate (SDS) and 1-pentanol in mixtures of water and a polar aprotic solvent (propylene carbonate, PC) was investigated by means of pulsed gradient spin-echo NMR, dynamic light scattering, viscosity, and conductivity measurements. PC partitions itself between micelles and aqueous bulk. The fraction of micellized propylene carbonate remains constant along PC-dilution, and the phase separation takes place when the composition of continuous phase attains the PC/water miscibility gap. The micellized PC is present mainly in the micelle's palisade and strongly increases the total interfacial area, thus acting as a cosurfactant. At high PC content, the system is composed by very small aggregates (around 10 A in radius) made by few SDS molecules (10-6) and PC and pentanol. The resulting system can be described as a nanostructured fluid with a huge interfacial area and a small dispersed phase.[1]

References

Nanostructured fluids based on propylene carbonate/water mixtures. Palazzo, G., Fiorentino, D., Colafemmina, G., Ceglie, A., Carretti, E., Dei, L., Baglioni, P. Langmuir : the ACS journal of surfaces and colloids. (2005) [Pubmed]

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