Volume 107, Number 2, July 2014
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||23 July 2014|
On the freezing behavior and diffusion of water in proximity to single-supported zwitterionic and anionic bilayer lipid membranes
1 Department of Physics and Astronomy and University of Missouri Research Reactor, University of Missouri Columbia, MO 652111, USA
2 Department of Chemistry, University of Missouri - Columbia, MO 65211, USA
3 Department of Chemistry, Technical University of Denmark, IK 207 DTU DK-2800 Lyngby, Denmark
4 Center for Neutron Research, National Institute of Standards and Technology Gaithersburg, MD 20899-6102, USA
5 Department of Materials Science and Engineering, University of Maryland - College Park, MD 20742, USA
6 Spallation Neutron Source, Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA
Received: 31 May 2014
Accepted: 1 July 2014
We compare the freezing/melting behavior of water hydrating single-supported bilayers of a zwitterionic lipid DMPC with that of an anionic lipid DMPG. For both membranes, the temperature dependence of the elastically scattered neutron intensity indicates distinct water types undergoing translational diffusion: bulk-like water probably located above the membrane and two types of confined water closer to the lipid head groups. The membranes differ in the greater width of the water freezing transition near the anionic DMPG bilayer compared to zwitterionic DMPC as well as in the abruptness of the freezing/melting transitions of the bulk-like water.
PACS: 87.16.D- – Membranes, bilayers, and vesicles / 78.70.Nx – Neutron inelastic scattering / 87.16.dj – Dynamics and fluctuations
© EPLA, 2014
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