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Stabilité et Structure d'Agrégats Catanioniques

Abstract : The catanionic system hydroxide de cetyltrimetylammonium - myristic acid - water studied here has the
advantage to produce aggregates with controlled charge. So, the ternary phase diagram presents some
interesting aggregates (micelle, vesicle, disc, lamellar phase). The study of the CMC put in evidence
some strong interactions between monomers : the interaction parameter is equal to -10kT. On a microscopic
point of view, the alkyl chains packing is hexagonal and we proved by WAXS and WANS that
the head groups are liquid ordered. More over, the hydrogen bonds participate to the bilayer cohesion.
The mechanical properties of the catanionic membrane are similar to the properties of phospholipids.
We estimated the Young modulus to 100MPa by compressibility measurements (acoustic propagation
and Langmuir trough). The thermodynamic properties studied by DSC showed that the chain melting
transition depends on the sample composition.
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Contributor : Claire Vautrin <>
Submitted on : Friday, November 26, 2004 - 9:59:14 AM
Last modification on : Thursday, February 1, 2018 - 1:38:19 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:50:46 PM


  • HAL Id : tel-00007523, version 1



Claire Vautrin. Stabilité et Structure d'Agrégats Catanioniques. Matériaux. Université de Versailles-Saint Quentin en Yvelines, 2004. Français. ⟨tel-00007523⟩



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