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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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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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High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping
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Three-dimensional atomic force microscopy: interaction force vector by direct observation of tip trajectory.

Krishna P Sigdel1, Justin S Grayer, Gavin M King

  • 1Department of Physics and Astronomy and ‡Joint with the Department of Biochemistry, University of Missouri-Columbia , Columbia, Missouri 65211.

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|October 9, 2013
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Summary

A new method precisely measures tip-sample forces in three dimensions using atomic force microscopy (AFM). This technique reveals significant lateral forces and provides a foundation for advanced 3D AFM applications.

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Area of Science:

  • Nanoscience
  • Surface Science
  • Biophysics

Background:

  • Conventional atomic force microscopy (AFM) lacks direct access to the tip-sample interaction force vector.
  • Understanding three-dimensional (3D) forces is crucial for advancing AFM capabilities in nanoscience.

Purpose of the Study:

  • To develop a method for directly measuring 3D tip-sample interaction forces.
  • To investigate the influence of surface properties on force vector components.

Main Methods:

  • Scattering a focused laser off the AFM tip apex to measure its 3D trajectory.
  • Calculating 3D cantilever spring constants and effective masses.
  • Applying Newton's second law to determine tip-sample force components (Fx, Fy, Fz).

Main Results:

  • Significant lateral forces (up to 49% of normal force) were observed on a glass substrate in aqueous solution.
  • The force vector direction tilted more than anticipated due to these lateral forces.
  • Tip-sample force component behavior differed on a lipid bilayer compared to glass, attributed to membrane mobility and elasticity.

Conclusions:

  • Direct measurement of 3D force components (Fx, Fy, Fz) offers a comprehensive understanding of tip dynamics.
  • This approach provides a foundation for developing robust 3D AFM.
  • The method is applicable across various experimental conditions and sample types.