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Coalescence during emulsification. 1. Method development.

Lloyd Lobo1, Aileen Svereika, Mridula Nair

  • 1Eastman Kodak Company, Imaging Media and Materials, Research and Development, 1999 Lake Avenue, Rochester, New York 14650-2108, USA. lloyd_lobo@nexpress.com

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

A novel method quantifies oil-in-water emulsion coalescence using a fluorescent probe. This technique measures changes in fluorescence intensity ratios to determine the rate of droplet coalescence during emulsification.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Chemical Engineering

Background:

  • Emulsification is crucial in various industries, but quantifying droplet coalescence remains challenging.
  • Understanding coalescence dynamics is key to controlling emulsion stability and properties.

Purpose of the Study:

  • To develop and validate a new method for measuring droplet coalescence during emulsification.
  • To establish a relationship between fluorescence intensity changes and coalescence rates.

Main Methods:

  • Introduction of a hydrophobic fluorescent probe into the oil phase of an emulsion.
  • Measurement of the fluorescence emission spectrum, specifically the ratio of excimer to monomer peak intensities.
  • Utilizing Monte Carlo simulations to correlate fluorescence ratio changes with coalescence rates.

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Main Results:

  • A decrease in the fluorescence intensity ratio directly indicates droplet coalescence.
  • The method is sensitive to probe concentration changes due to random coalescence events.
  • Experimental validation confirms the signal is solely due to coalescence, independent of drop size distribution.

Conclusions:

  • The proposed fluorescence-based method provides a reliable and sensitive tool for quantifying droplet coalescence.
  • This technique offers a new way to monitor and control emulsification processes.
  • The findings contribute to a better understanding of emulsion formation and stability.