Volume 98, Number 4, May 2012
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||28 May 2012|
Study of water diffusion on single-supported bilayer lipid membranes by quasielastic neutron scattering
Department of Physics and Astronomy and University of Missouri Research Reactor, University of Missouri Columbia, MO 65211, USA
2 Center for Neutron Research, National Institute of Standards and Technology - Gaithersburg, MD 20899-6102, USA
3 Department of Materials Science and Engineering, University of Maryland - College Park, MD 20742, USA
4 Spallation Neutron Source, Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA
Accepted: 23 April 2012
High-energy-resolution quasielastic neutron scattering has been used to elucidate the diffusion of water molecules in proximity to single bilayer lipid membranes supported on a silicon substrate. By varying sample temperature, level of hydration, and deuteration, we identify three different types of diffusive water motion: bulk-like, confined, and bound. The motion of bulk-like and confined water molecules is fast compared to those bound to the lipid head groups (7–10 H2O molecules per lipid), which move on the same nanosecond time scale as H atoms within the lipid molecules.
PACS: 87.16.D- – Membranes, bilayers, and vesicles / 78.70.Nx – Neutron inelastic scattering / 87.16.dj – Dynamics and fluctuations
© EPLA, 2012
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