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Atomic Force Microscopy01:08

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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
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Cantilever-based optical interfacial force microscope in liquid using photothermal actuation.

Byung I Kim1

  • 1Department of Physics, Boise State University, Boise, Idaho 83725, USA.

The Review of Scientific Instruments
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

A new optical interfacial force microscope uses photothermal actuation for precise single-molecule force measurements in liquids. This cantilever-based instrument achieves high force resolution, revealing molecular interactions and mechanical properties.

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Area of Science:

  • Nanotechnology
  • Surface Science
  • Biophysics

Background:

  • Measuring single-molecule interactions in liquid is crucial for understanding biological and chemical processes.
  • Existing techniques often face limitations in resolution or applicability in aqueous environments.

Purpose of the Study:

  • To develop a novel cantilever-based optical interfacial force microscope (COIFM) for precise force measurements.
  • To utilize photothermal actuation for enhanced sensitivity and performance in liquid.

Main Methods:

  • Developed a COIFM employing photothermal actuation of a silicon cantilever with optical detection.
  • Utilized the force feedback technique for measuring single molecular interactions.
  • Characterized force resolution and performed force-distance curve measurements in deionized water.

Main Results:

  • Achieved a force resolution of approximately 1.5 pN in deionized water.
  • Measured attractive forces of -50 pN at a 30 nm distance between probe and surface.
  • Demonstrated the COIFM's capability to obtain force-distance curves on approach and retraction.

Conclusions:

  • The photothermal COIFM enables direct measurement of force-distance curves in liquid environments.
  • The instrument is capable of unveiling structural and mechanical information at the single molecular level.
  • This technique offers a powerful tool for studying interfacial phenomena in biological and material science applications.