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Related Experiment Videos

Proton transport at the monolayer-water interface.

H Morgan1, D M Taylor, O N Oliveira

  • 1Institute of Molecular and Biomolecular Electronics, University of Wales, Bangor, Gwynedd, U.K.

Biochimica Et Biophysica Acta
|March 7, 1991
PubMed
Summary

Monolayer compression initiates lateral conduction and increases surface potential above a critical area. This phenomenon, linked to headgroup reorganization and hydrogen bonding with water, likely involves proton hopping for conductivity.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Biophysics

Background:

  • Lipid monolayers at interfaces exhibit complex behaviors.
  • Molecular packing density influences interfacial properties.
  • Water structure plays a role in biological interfaces.

Purpose of the Study:

  • To investigate the initiation of lateral conduction in lipid monolayers.
  • To understand the relationship between molecular packing and interfacial properties.
  • To elucidate the role of water structure in monolayer behavior.

Main Methods:

  • Compression of stearic acid, palmitic acid, DPPC, and DPPS monolayers.
  • Measurement of interfacial conductance and surface potential.
  • Analysis of critical area (Ac) and effects of SCN- ions.

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Main Results:

  • Lateral conduction initiated at a critical area (Ac) upon monolayer compression.
  • Interfacial conductance and positive surface potential increase with molecular packing.
  • Ac is approximately double molecular areas and decreases with SCN- addition.

Conclusions:

  • Structural reorganization at the headgroup/water interface reduces local permittivity.
  • A hydrogen-bonded network between headgroups and water likely forms at Ac.
  • Proton hopping along this network is the proposed conduction mechanism.