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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Updated: Jun 30, 2026

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
10:15

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Probing the lipid membrane dipole potential by atomic force microscopy.

Yi Yang1, Kathryn M Mayer, Nissanka S Wickremasinghe

  • 1Department of Physics & Astronomy, Rice University, Houston, Texas, USA.

Biophysical Journal
|September 23, 2008
PubMed
Summary

Researchers measured the membrane dipole potential using atomic force microscopy. This new method quantifies the dipole moment of lipid membranes, aiding the study of their biological effects.

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Area of Science:

  • Membrane biophysics
  • Physical chemistry
  • Nanotechnology

Background:

  • Biological membranes possess electrostatic properties including transmembrane, surface, and dipole potentials.
  • The membrane dipole potential is poorly understood, with inconsistent measurement methods and unclear origins.
  • This ambiguity hinders research into the significant biological roles of the membrane dipole moment.

Purpose of the Study:

  • To develop a quantitative method for measuring the membrane dipole potential.
  • To investigate the source of the membrane dipole moment in phosphatidylcholine membranes.
  • To enable noninvasive, high-resolution studies of dipole potential's biological impact.

Main Methods:

  • Utilized atomic force microscopy (AFM) to analyze electrostatic interactions with supported phosphatidylcholine membranes.
  • Quantified the repulsive force between negatively charged AFM probe tips and zwitterionic lipids.
  • Analyzed the weak external field generated by the internal membrane dipole potential.

Main Results:

  • Observed an unexpected repulsive force between the AFM probe and lipid headgroups.
  • Determined this repulsion originates from the membrane dipole potential.
  • Calculated a dipole moment of 1.5 Debye per lipid and a dipole potential of +275 mV for phosphatidylcholine membranes.

Conclusions:

  • Developed a novel, noninvasive AFM-based method to quantitatively measure membrane dipole moments.
  • Provided precise values for the dipole moment and potential of phosphatidylcholine membranes.
  • This technique offers nanometer-scale spatial resolution for future studies on the biological significance of membrane dipole potentials.