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Related Concept Videos

Atomic Force Microscopy01:08

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Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
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Published on: February 10, 2021

Electrostatic interaction in atomic force microscopy.

H J Butt1

  • 1Max Planck Institut für Biophysik, Kennedyallee 70, 6000 Frankfurt a.M. 70, Germany.

Biophysical Journal
|May 12, 2009
PubMed
Summary
This summary is machine-generated.

In atomic force microscopy (AFM), electrostatic forces between the stylus and charged surfaces are comparable to Van der Waals forces. These repulsive electrostatic forces can be managed by adjusting salt concentration or surface potential.

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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Last Updated: Jun 23, 2026

Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
08:31

Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)

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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
10:37

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

Published on: March 16, 2020

Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Atomic force microscopy (AFM) is a high-resolution surface imaging technique.
  • Imaging in aqueous media introduces electrostatic interactions between the AFM stylus and the charged sample surface.
  • Understanding these forces is crucial for accurate nanoscale measurements.

Purpose of the Study:

  • To numerically calculate the electrostatic force experienced by AFM styli in aqueous environments.
  • To compare the electrostatic force with the Van der Waals force.
  • To investigate methods for controlling or mitigating electrostatic forces during AFM imaging.

Main Methods:

  • Continuum theory was employed for numerical calculations.
  • Simulations were performed for silicon nitride and silicon oxide styli.
  • Van der Waals forces were also calculated for comparative analysis.

Main Results:

  • The electrostatic force is repulsive, unlike the attractive Van der Waals force.
  • At 0.5 nm separation, electrostatic forces (10^-12 to 10^-10 N) are comparable in magnitude to Van der Waals forces.
  • Electrostatic force increases with surface charge density and decays exponentially with distance.
  • High salt concentrations effectively reduce electrostatic forces.
  • An analytical approximation for electrostatic force is provided for surface potentials below 50 mV.

Conclusions:

  • Electrostatic forces are a significant factor in AFM imaging in aqueous media.
  • These forces can be modulated by controlling surface charge, distance, and ionic strength.
  • The findings provide a basis for improved AFM operation and data interpretation in liquid environments.