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Fluorescence microscopy visualization of contacts between objects.

Tomislav Suhina1, Bart Weber, Chantal E Carpentier

  • 1van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam (The Netherlands); Institute of Physics, University of Amsterdam, P.O. Box 94485, 1090 GL Amsterdam (The Netherlands).

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This study introduces a novel fluorescence-based method to detect contact areas between surfaces. The technique utilizes rigidochromic probes, showing excellent agreement with Hertz

Keywords:
fluorescent probesinterfacesmechanical propertiessurface chemistry

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Area of Science:

  • Materials Science
  • Surface Physics
  • Chemical Engineering

Background:

  • Contact area detection is crucial in mechanics and materials science.
  • Existing methods may lack sensitivity or spatial resolution.
  • Rigidochromic probes offer potential for sensitive surface interaction detection.

Purpose of the Study:

  • To develop and demonstrate a fluorescence-based method for imaging contact areas.
  • To utilize rigidochromic probe molecules for enhanced fluorescence detection upon confinement.
  • To validate the method against established mechanical theories.

Main Methods:

  • Attaching rigidochromic probe molecules to one surface.
  • Utilizing fluorescence enhancement due to molecular confinement in the contact zone.
  • Imaging the contact area between a plastic sphere and a glass surface.

Main Results:

  • Successfully detected and imaged the contact area using fluorescence enhancement.
  • Observed suppression of nonradiative decay leading to fluorescence turn-on.
  • Experimental results showed excellent agreement with Hertz's classical theory for elastic deformation.

Conclusions:

  • The developed fluorescence method provides a sensitive and accurate way to detect contact areas.
  • Rigidochromic probes are effective for visualizing mechanical contact at surfaces.
  • The technique validates the principles of elastic deformation described by Hertz's theory.