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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
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An Activity-Based Dissolution Model for Solute-Containing Microdroplets.

Deborah L Bitterfield1, Anders Utoft2, David Needham1,2

  • 1Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 2, 2016
PubMed
Summary
This summary is machine-generated.

This study models aqueous salt solution microdroplet dissolution, accounting for changing water activity. The model accurately predicts dissolution rates and identifies the supersaturation limit for NaCl nucleation.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Solute presence in aqueous droplets reduces water activity and dissolution rates compared to pure water.
  • Dynamically changing solute concentration at the droplet interface significantly impacts water activity and chemical potential.

Purpose of the Study:

  • To develop a dissolution rate model for aqueous salt solution microdroplets dissolving into immiscible liquids.
  • To investigate the validity of local equilibrium assumptions at the droplet interface during dissolution.
  • To extend the Epstein-Plesset equation to model salt solution droplet dissolution.

Main Methods:

  • Developed a dissolution model based on the Epstein-Plesset equation, incorporating kinetic effects of water activity.
  • Utilized the micropipet technique to create and monitor single NaCl solution microdroplets in octanol and butyl acetate.
  • Measured NaCl concentrations in water, extending into supersaturated regimes.

Main Results:

  • The model successfully predicted droplet diameter over time in both octanol and butyl acetate.
  • Observed NaCl concentrations exceeding 5.4 M, well into the supersaturated region.
  • Determined the NaCl supersaturation limit for nucleation to be 10.24 ± 0.31 M.

Conclusions:

  • The developed model accurately predicts the dissolution kinetics of aqueous salt solution microdroplets.
  • The study provides critical data on the supersaturation limit for NaCl nucleation.
  • Understanding water activity dynamics is crucial for accurate modeling of solution droplet dissolution.