Ethanol enhances collective dynamics of lipid membranes

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.83.050907· OSTI ID:21560281

Kaye, Martin D ^[1]; Schmalzl, Karin ^[2]; Conti Nibali, Valeria ^[3]; Tarek, Mounir ^[4]; Rheinstaedter, Maikel C ^[5]

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1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)
2. Juelich Centre for Neutron Science, Forschungszentrum Juelich, Outstation at ILL, F-38042 Grenoble Cedex 9 (France)
3. Dipartimento di Fisica, Universita degli Studi di Messina, I-98100 Messina (Italy)
4. UMR 7565, Structure et Reactivite des Systemes Moleculaires Complexes, CNRS-Nancy University, F-54506 Vandoeuvre les Nancy (France)
5. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 Canada (Canada)

From inelastic neutron-scattering experiments and all atom molecular dynamics simulations we present evidence for a low-energy dynamical mode in the fluid phase of a 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine (DMPC) bilayer immersed in a 5% water/ethanol solution. In addition to the well-known phonon that shows a liquidlike dispersion with energies up to 4.5 meV, we observe an additional mode at smaller energies of 0.8 meV, which shows little or no dispersion. Both modes show transverse properties and might be related to molecular motion perpendicular to the bilayer.

• OSTI ID: 21560281
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevE.83.050907; (c) 2011 American Institute of Physics; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
AQUEOUS SOLUTIONS
ATOMS
ETHANOL
FLUIDS
INELASTIC SCATTERING
LAYERS
MEMBRANES
MEV RANGE
MOLECULAR DYNAMICS METHOD
NEUTRON DIFFRACTION
PHONONS
PHOSPHOLIPIDS
ALCOHOLS
CALCULATION METHODS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ENERGY RANGE
ESTERS
HOMOGENEOUS MIXTURES
HYDROXY COMPOUNDS
LIPIDS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
QUASI PARTICLES
SCATTERING
SOLUTIONS