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Interfacial charge density influences alkane and phospholipid interactions with electrodes. High charge densities prevent decane binding due to water polarization, while lipid binding depends on electrostatic and van der Waals forces.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Materials Science

Background:

  • Understanding molecular interactions at charged interfaces is crucial for fields like electrochemistry and biomaterials.
  • Alkanes and phospholipids serve as model systems to probe fundamental forces at electrode-electrolyte boundaries.

Purpose of the Study:

  • To investigate how varying interfacial charge densities affect the association of alkanes and phospholipids with charged electrodes.
  • To elucidate the roles of Coulombic and van der Waals forces in these interfacial interactions.
  • To compare simulation results with experimental electrochemical data.

Main Methods:

  • Molecular dynamics simulations of alkanes and phospholipids (POPC, PS) at charged interfaces.
  • Experimental electrochemical measurements, including bipolar displacement currents.
  • Analysis of binding affinities and atomic interactions at the simulated interfaces.

Main Results:

  • Van der Waals forces drive rapid decane binding to neutral electrodes, but this is inhibited at high surface charge densities by water polarization.
  • The positively charged choline headgroup of POPC mediates attraction to negatively charged electrodes, with stronger binding at higher negative charges.
  • Anionic PS lipids show maximal interaction with positively charged interfaces when electrostatic forces dominate.
  • Simulations revealed atomic interactions facilitating lipid vesicle adhesion, consistent with experimental findings.

Conclusions:

  • Interfacial charge density significantly modulates the adsorption of hydrophobic molecules and lipids via electrostatic and van der Waals forces.
  • Molecular dynamics simulations with charged interfaces offer a valuable method for studying membrane electropermeabilization and related phenomena.
  • The study provides atomic-level insights into lipid-electrode interactions, bridging simulation and experimental observations.