ARNOULD, Audrey; PEREZ, Adrian; GAILLARD, Cédric; DOULIEZ, Jean-Paul; COUSIN, Fabrice; SANTIAGO, Liliana; ZEMB, Thomas; ANTON, Marc; FAMEAU, Anne-Laure

doi:10.1016/j.jcis.2015.01.008

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ARNOULD, Audrey
Unité de recherche sur les Biopolymères, Interactions Assemblages [BIA]

PEREZ, Adrian
Grupo Biocoloides y nanotecnologías [GBN]

GAILLARD, Cédric
Unité de recherche sur les Biopolymères, Interactions Assemblages [BIA]

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Journal of Colloid and Interface Science. 2015-05, vol. 445, p. 285-293

Elsevier

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Salt-free catanionic systems based on fatty acids exhibit a broad polymorphism by simply tuning the molar ratio between the two components. For fatty acid combined with organic amino counter-ions, very few data are available on the phase behavior obtained as a function of the molar ratio between the counter-ion and the fatty acid. We investigated the choline hydroxide/myristic acid system by varying the molar ratio, R = ncholine hydroxide/nmyristic acid, and the temperature. Myristic acid ionization state was determined by coupling pH, conductivity and infra-red spectroscopy measurements. Self-assemblies were characterized by small angle neutron scattering and microscopy experiments. Self-assembly thermal behavior was investigated by differential scanning calorimetry, wide angle X-ray scattering and nuclear magnetic resonance. For R < 1, ionized and protonated myristic acid molecules coexisted leading to the formation of facetted self-assemblies and lamellar phases. The melting process between the gel and the fluid state of these bilayers induced a structural change from facetted or lamellar objects to spherical vesicles. For R > 1, myristic acid molecules were ionized and formed spherical micelles. Our study highlights that both R and temperature are two key parameters to finely control the self-assembly structure formed by myristic acid in the presence of choline hydroxide.< Réduire

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catanionic

counter-ion

fatty acid

molar ratio

self-assembly

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Self-assembly of myristic acid in the presence of choline hydroxide: Effect of molar ratio and temperature

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