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Wettability characterization method based on optical coherence tomography imaging.

Tapio Fabritius1, Risto Myllylä, Shuichi Makita

  • 1Optoelectronics and Measurement Techniques Laboratory, University of Oulu, Oulu, Finland. tapio.fabritius@ee.oulu.fi

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Summary
This summary is machine-generated.

This study introduces a new method for surface wetting characterization using optical coherence tomography (OCT) to measure contact angles and determine droplet refractive index. The technique offers precise, non-contact 3D imaging for advanced material analysis.

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Area of Science:

  • Materials Science
  • Optical Physics
  • Surface Chemistry

Background:

  • Surface wetting characterization is crucial for understanding material properties and interactions.
  • Traditional contact angle measurements can be limited in scope and precision.
  • Non-contact, high-resolution imaging techniques are needed for advanced surface analysis.

Purpose of the Study:

  • To present a novel method for surface wetting characterization using optical coherence tomography (OCT).
  • To demonstrate the capability of OCT for precise contact angle measurements and refractive index determination.
  • To validate the proposed method on a glycerol droplet on a rough tilted glass substrate.

Main Methods:

  • Utilizing optical coherence tomography (OCT) for non-contact, 3D structural imaging of droplets on substrates.
  • Implementing an automatic OCT intensity variation-based layer segmentation algorithm to identify interfaces (air-droplet, droplet-substrate, air-substrate).
  • Performing contact angle measurements and refractive index determination from the OCT data.

Main Results:

  • The method successfully characterized surface wetting properties.
  • Contact angles could be obtained from any observation angle.
  • The average refractive index of the droplet was determined.
  • The technique provided micrometer resolution images without physical contact.

Conclusions:

  • The proposed OCT-based method is a valuable and complementary tool for surface wetting characterization.
  • It offers high-resolution, non-contact 3D imaging capabilities.
  • This technique enhances the precision and scope of contact angle measurements and material property analysis.