How does the chemistry of lipids influence the behaviour of interlayer water ?
The phase diagram of confined water below 273 K is not only influenced by the confinement, but also by the presence of solutes or ions, the surface chemistry or the confining matrix elasticity. These factors have a drastic influence on the sorption (or desorption) of water when increasing (or decreasing) the temperature between 200 and 273 K, leading to macroscopic water diffusion in some systems and not in others. The mechanisms for such behaviour are still poorly understood. We propose to address this question in investigating the phase behavior of water in lamellar lipid arrangements, in which water is confined between bilayers over thicknesses of ~0.3-2 nm. Lipid bilayers present ideal systems to study the effects of ions and surface chemistry on the water melting point and diffusion coefficient. On four selected lipid systems with different headgroups and similar tails, we will measure on IN5 simultaneously the diffusional dynamics, the ice diffraction pattern and the interlamellar spacing as a function of temperature. The experimental results will enable to evaluate the different thermodynamical contributions to the water melting point. We require 3 days of beam time.
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PLAZANET Marie; COASNE Benoit; OLLIVIER Jacques and PETERS Judith. (2017). How does the chemistry of lipids influence the behaviour of interlayer water ?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-07-14
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