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Related Experiment Videos

Hydration force in the atomic force microscope: A computational study

R Ho1, J Y Yuan, Z Shao

  • 1Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, Virginia 22908 USA.

Biophysical Journal
|July 24, 1998
PubMed
Summary
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Hydration forces in atomic force microscopy (AFM) remain oscillatory even at the molecular level. This water layer acts as a lubricant, enhancing AFM resolution for biological specimens.

Area of Science:

  • Physics
  • Surface Science
  • Biophysics

Background:

  • Atomic Force Microscopy (AFM) is a high-resolution surface imaging technique.
  • Understanding tip-sample interactions is crucial for interpreting AFM data, especially for biological specimens.
  • Hydration forces, arising from water layers, can significantly influence these interactions.

Purpose of the Study:

  • To investigate the effect of hydration force between a conical AFM tip and a flat surface.
  • To determine the role of hydration force in achieving high resolution in contact-mode AFM.
  • To explore the relationship between tip geometry and hydration force magnitude.

Main Methods:

  • Utilized a hard sphere model for numerical calculations.
  • Simulated the hydration force between a conical tip and a flat surface.

Related Experiment Videos

  • Analyzed the influence of tip apex size and curvature on hydration force.

    • Main Results:

    • Hydration force remains oscillatory down to a single water molecule tip apex.
    • The lateral extent of hydration force is limited to a few water molecules.
    • A bound water layer acts as a lubricant, reducing lateral force and enhancing AFM resolution.
    • Disrupting this layer requires probe forces of several nanonewtons.
    • Averaged hydration pressure is independent of tip radius of curvature.

    Conclusions:

    • The bound water layer is a key factor in high-resolution contact-mode AFM imaging of biological samples.
    • Sharper tips may be advantageous if hydration force is the dominant interaction.
    • Calculated hydration energy aligns with experimental AFM values, validating the model.