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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Accounting for optical errors in microtensiometry.

Zachary R Hinton1, Nicolas J Alvarez1

  • 1Drexel University, Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States.

Journal of Colloid and Interface Science
|May 14, 2018
PubMed
Summary
This summary is machine-generated.

Optical errors in drop shape analysis (DSA) are quantified. Understanding misalignment and focal plane effects improves interfacial tension measurements, especially in microfluidics.

Keywords:
Drop shape analysisInterfacial tensionMicrotensiometrySurface tension

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Area of Science:

  • Physics
  • Surface Science
  • Optical Metrology

Background:

  • Drop Shape Analysis (DSA) techniques are crucial for measuring interfacial tension.
  • Existing DSA methods often overlook optical system errors, primarily misalignment and focal plane choice.
  • These optical errors can significantly impact curvature measurements.

Purpose of the Study:

  • To develop a geometric model to analytically determine optical error contributions in DSA.
  • To experimentally validate the model using microtensiometry.
  • To deconvolute the effects of misalignment and focal plane on interfacial curvature measurements.

Main Methods:

  • Development of a geometric model for spherical cap interfaces.
  • Validation of the model using a microtensiometer.
  • Empirical calibration to correct for optical errors in microtensiometry.

Main Results:

  • A convoluted relationship exists between true and measured interfacial radius due to optical errors.
  • Optical error contributions are minimized for hemispherical interfaces (height equals capillary radius).
  • The validated model defines an operating window dependent on capillary radius and spherical cap height.

Conclusions:

  • Accurate interfacial curvature and tension measurements are achievable by accounting for optical errors.
  • This work has broad implications for all DSA techniques, particularly microscale and microfluidic applications.
  • An empirical calibration simplifies microtensiometry setup and enhances accuracy.