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A multifunctional force microscope for soft matter with in situ imaging.

Paul Roberts1, Georgia A Pilkington1, Yumo Wang1

  • 1Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.

The Review of Scientific Instruments
|May 3, 2018
PubMed
Summary

We developed a multifunctional force microscope (MFM) for precise normal and lateral force measurements. This versatile instrument demonstrates high sensitivity across a wide force range, enabling various material science experiments.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Accurate measurement of normal and lateral forces is crucial for understanding material properties at micro and nano scales.
  • Existing force microscopy techniques may have limitations in sensitivity, force range, or in situ imaging capabilities.

Purpose of the Study:

  • To introduce and characterize a novel multifunctional force microscope (MFM).
  • To demonstrate the instrument's capability for in situ force measurements with high sensitivity and a broad force range.

Main Methods:

  • The MFM utilizes fiber optic sensors to measure normal and lateral cantilever deflection, calculating forces.
  • Precise motion control is achieved using linear micro-translation stages and a piezoelectric actuator.
  • Custom-designed cantilevers enable force measurements spanning four orders of magnitude (50 μN to 1 N).

Main Results:

  • The MFM successfully performed probe tack, friction, and hydrodynamic drainage experiments.
  • The instrument demonstrated high sensitivity and versatility in force measurements.
  • A wide measurable force range from 50 μN to 1 N was validated.

Conclusions:

  • The developed multifunctional force microscope is a sensitive and versatile instrument for nanoscale force measurements.
  • Its in situ imaging and broad force measurement capability make it suitable for diverse material science applications.