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Related Experiment Videos

Optically monitored dip coating as a contactless viscometry method for liquid films.

Alexandre F Michels1, Thiago Menegotto, Flavio Horowitz

  • 1Universidade Federal do Rio Grande do Sul, Campus do Vale CP15051, Porto Alegre, Rio Grande do Sul 91501-970, Brasil. michels@if.ufrgs.br

Applied Optics
|March 9, 2005
PubMed
Summary

Real-time interferometric monitoring precisely measures liquid film properties during dip coating. This technique accurately determines kinematic viscosity for nonvolatile Newtonian oils, offering a contactless viscometry method.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Optical metrology

Background:

  • Dip coating is a common method for applying thin liquid films.
  • Understanding liquid properties is crucial for controlling film thickness and uniformity.
  • Traditional viscometry methods can be invasive or require larger sample volumes.

Purpose of the Study:

  • To investigate the application of real-time interferometric monitoring for studying liquid properties.
  • To validate a simple model for film thickness evolution in dip coating.
  • To assess the accuracy of this method for contactless viscometry.

Main Methods:

  • Utilizing real-time interferometric monitoring during the dip coating process.
  • Analyzing the physical thickness of the liquid film over time.

Related Experiment Videos

  • Applying a model where film thickness depends on time as t(-1/2) after reaching steady state.
  • Measuring kinematic viscosity of mineral oil standards at various withdrawing speeds.

    • Main Results:

    • The study successfully applied interferometric monitoring to characterize flowing liquids.
    • Measured kinematic viscosities for two mineral oil standards were 1.17+/-0.03 S and 9.9+/-0.2 S.
    • Results showed good agreement with manufacturer-provided nominal values.

    Conclusions:

    • Real-time interferometric monitoring of dip coating is a promising technique for accurate, contactless viscometry.
    • The method allows for precise measurement of liquid film properties.
    • Further investigation into advantages and limitations is warranted for broader application.