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Hydration Repulsion Difference between Ordered and Disordered Membranes Due to Cancellation of Membrane–Membrane and Water-Mediated Interactions
journal contribution
posted on 2017-06-07, 00:00 authored by Bartosz Kowalik, Alexander Schlaich, Matej Kanduč, Emanuel Schneck, Roland R. NetzHydration
repulsion acts between all sufficiently polar surfaces
in water at small separations and prevents dry adhesion up to kilobar
pressures. Yet it remained unclear whether this ubiquitous force depends
on surface structure or is a sole water property. We demonstrate that
previous deviations among different experimental measurements of hydration
pressures in phospholipid bilayer stacks disappear when plotting data
consistently as a function of repeat distance or membrane surface
distance. The resulting pressure versus distance curves agree quantitatively
with our atomistic simulation results and exhibit different decay
lengths in the ordered gel and the disordered fluid states. This suggests
that hydration forces are not caused by water ordering effects alone.
Splitting the simulated total pressure into membrane–membrane
and water-mediated parts shows that these contributions are opposite
in sign and of similar magnitude, thus they are equally important.
The resulting net hydration pressure between membranes is what remains
from the near-cancellation of these ambivalent contributions.
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water-mediated partskilobar pressuresHydration Repulsion Differencehydration pressuresWater-Mediated Interactions Hydration repulsion actswater propertyfluid statesatomistic simulation resultssurface structuredistance curvesphospholipid bilayer stackshydration forcesDisordered Membranesmembrane surface distancedecay lengthscontributionhydration pressure
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