Knowing the ability of water and bile salts to promote the reverse wormlike micelle growth in lecithin/water or lecithin/bile salt mixtures in oil, this work was aimed at elucidating the association properties of the three solutes lecithin, water and the bile salt (BS) sodium deoxycholate in cyclohexane. By systematically changing the fraction of the two additives (i.e.: water and BS) we could identify a region at low additive/lecithin molar ratios where stable wormlike micelle dispersions were formed. Small angle X-ray scattering and oscillatory rheology measurements demonstrated that the ability of bile salt and water to transform the originally spherical lecithin reverse micelles into wormlike micelles and thereby impart to the sample viscoelastic properties is preserved in the three-solute mixture. The results suggest that reverse micelle including both bile salt and water are formed in this system. Reasonably the two primers interact with the same region of the lecithin headgroups and are complementary in altering the packing parameter of the amphiphile to values suitable for the formation of cylindrical aggregates.

Wormlike reverse micelles in lecithin/bile salt/water mixtures in oil / Cautela, Jacopo; Giustini, Mauro; Pavel, Nicolae Viorel; Palazzo, Gerardo; Galantini, Luciano. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - STAMPA. - 532:(2017), pp. 411-419. [10.1016/j.colsurfa.2017.04.052]

Wormlike reverse micelles in lecithin/bile salt/water mixtures in oil

Cautela, Jacopo;GIUSTINI, Mauro;PAVEL, Nicolae Viorel;PALAZZO, Gerardo;GALANTINI, Luciano
2017

Abstract

Knowing the ability of water and bile salts to promote the reverse wormlike micelle growth in lecithin/water or lecithin/bile salt mixtures in oil, this work was aimed at elucidating the association properties of the three solutes lecithin, water and the bile salt (BS) sodium deoxycholate in cyclohexane. By systematically changing the fraction of the two additives (i.e.: water and BS) we could identify a region at low additive/lecithin molar ratios where stable wormlike micelle dispersions were formed. Small angle X-ray scattering and oscillatory rheology measurements demonstrated that the ability of bile salt and water to transform the originally spherical lecithin reverse micelles into wormlike micelles and thereby impart to the sample viscoelastic properties is preserved in the three-solute mixture. The results suggest that reverse micelle including both bile salt and water are formed in this system. Reasonably the two primers interact with the same region of the lecithin headgroups and are complementary in altering the packing parameter of the amphiphile to values suitable for the formation of cylindrical aggregates.
wormlike micelles; lecithin; rheology; SAXS; bile salts
01 Pubblicazione su rivista::01a Articolo in rivista
Wormlike reverse micelles in lecithin/bile salt/water mixtures in oil / Cautela, Jacopo; Giustini, Mauro; Pavel, Nicolae Viorel; Palazzo, Gerardo; Galantini, Luciano. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - STAMPA. - 532:(2017), pp. 411-419. [10.1016/j.colsurfa.2017.04.052]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/965686
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