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Subpiconewton intermolecular force microscopy

M Tokunaga1, T Aoki, M Hiroshima

  • 1Yanagida BioMotron Project, ERATO, JST, Osaka, Japan. tokunaga@yanagida.jst-c.go.jp

Biochemical and Biophysical Research Communications
|February 24, 1997
PubMed
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Researchers enhanced scanning probe force microscopy using a highly flexible cantilever and laser feedback. This breakthrough allows for precise measurement of subpiconewton intermolecular forces, crucial for studying biological molecules.

Area of Science:

  • Physics
  • Materials Science
  • Biophysics

Background:

  • Conventional atomic force microscopy (AFM) faces limitations in detecting subtle intermolecular forces.
  • High stiffness of typical AFM cantilevers restricts force sensitivity.
  • Precise control of probe position is essential for nanoscale force measurements.

Purpose of the Study:

  • To enhance the sensitivity of force detection in scanning probe force microscopy.
  • To improve the precision of probe position control.
  • To enable the measurement of subpiconewton intermolecular forces for biological applications.

Main Methods:

  • Incorporation of a novel cantilever with ultra-low stiffness (0.1 pN/nm), over 1000-fold more flexible than conventional ones.
  • Implementation of feedback positioning using laser radiation pressure to minimize thermal bending motions to <1 nm.

Related Experiment Videos

  • Testing the system by measuring electrostatic and hydrophobic forces in aqueous solutions.

    • Main Results:

    • Achieved significantly enhanced force sensitivity, enabling detection of subpiconewton intermolecular forces.
    • Demonstrated precise control of probe position within the nanometer range.
    • Successfully resolved intermolecular forces between a probe and a material surface in solution.

    Conclusions:

    • The refined scanning probe force microscopy system achieves unprecedented force and position sensitivity.
    • This advancement is critical for future investigations of intermolecular forces between biological macromolecules like proteins, lipids, and DNA.
    • The technology opens new avenues for high-resolution biophysical studies.