Multiple Interacting Collective Modes and Phonon Gap in Phospholipid Membranes

The Journal of Physical Chemistry Letters
Giovanna D'AngeloA Paciaroni

Abstract

We combine Brillouin neutron scattering measurements with recent inelastic X-ray scattering [ Zhernenkov et al. Nat. Commun. 2016 , 7 , 11575 ] to propose a model for the collective dynamics of phospholipid bilayers. Neutron and X-ray spectra were fitted by the model response function associated with the Hamiltonian of an interacting-phonon system. This approach allows for a comprehensive and unprecedented picture of the vibrational collective features of phospholipids. At low wavevectors Q, the dispersion relations can be interpreted in terms of two acoustic-like modes, one longitudinal and one transverse, plus a dispersionless optic-like mode. The transverse mode of the liquid phase shows a phonon gap that can be linked to a passive transport mechanism through membranes, an interpretation that was proposed in Zhernenkov et al. At higher Q values, the interaction of the longitudinal acoustic excitation with the dispersionless mode gives rise to a pattern that is consistent with avoided-crossing behavior. Evidence is found for a slow- to fast-sound transition, similar to bulk water and other biomolecules.

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Citations

Dec 23, 2019·The Journal of Chemical Physics·V E Zakhvataev
Feb 20, 2020·Proceedings of the National Academy of Sciences of the United States of America·Dmytro SoloviovMikhail Zhernenkov
Sep 28, 2020·Chemistry and Physics of Lipids·Dima BolmatovMaxim O Lavrentovich
Apr 8, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Dima BolmatovJohn Katsaras
Oct 10, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Dipankar MondalNilmoni Sarkar

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