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Relaxor Ferroelectric-Like Spatiotemporal Memory in Field-Driven Lipid Bilayers.

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Lipid bilayers exhibit unique memory properties, acting as nonlinear dielectrics with persistent polarization after electric field exposure. This behavior offers a physical basis for nanoscale information storage.

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Area of Science:

  • Biophysics
  • Materials Science
  • Soft Matter Physics

Background:

  • Lipid membranes are typically viewed as passive barriers.
  • Their nonlinear dielectric properties and memory effects are not well understood.

Purpose of the Study:

  • To investigate the dielectric response of lipid bilayers under time-dependent electric fields.
  • To explore the potential for nanoscale information storage in lipid membranes.

Main Methods:

  • All-atom molecular dynamics simulations.
  • Directionally resolved Van Hove analysis.
  • Investigation of free-energy landscapes.

Main Results:

  • Dipalmitoylphosphatidylcholine bilayers show relaxor ferroelectric-like, unipolar polarization.
  • Persistent, asymmetric polarization and nanoscale polarization memory observed.
  • Potassium chloride enhances polarization effects through dielectric screening.

Conclusions:

  • Protein-free lipid bilayers function as nonlinear, history-dependent dielectrics.
  • Demonstrated potential for field-tunable electromechanical coupling.
  • Provides a physical basis for nanoscale information storage and neuromorphic phenomena.