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Water Evaporation from Acoustically Levitated Aqueous Solution Droplets.

Nicole A Combe1, D James Donaldson1,2

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Solutes affect droplet evaporation rates, with most salts slowing evaporation as predicted by a modified Maxwell equation. Ammonium salts, however, evaporated at rates similar to pure water, suggesting unique surface effects influence their behavior.

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Area of Science:

  • Physical Chemistry
  • Aerosol Science
  • Surface Science

Background:

  • Evaporation of aqueous droplets is crucial in various natural and industrial processes.
  • Understanding solute effects on evaporation is key to predicting droplet behavior.

Purpose of the Study:

  • To systematically investigate how different solutes impact the evaporation rate of acoustically levitated aqueous droplets.
  • To compare experimental evaporation rates with theoretical predictions based on the Maxwell equation.

Main Methods:

  • Acoustic levitation was used to suspend individual aqueous solution droplets.
  • Droplet size was measured over time in a zero-relative humidity environment.
  • Evaporation rates were calculated and compared for various salt solutions and pure water.

Main Results:

  • Six simple salts and malonic acid showed evaporation rates consistent with a modified Maxwell equation, indicating solute-induced depression of evaporation.
  • Ammonium salt solutions (ammonium chloride, ammonium nitrate, ammonium sulfate) exhibited evaporation rates not significantly different from pure water.
  • At later stages, nearing crystallization, most solutions followed the modified Maxwell equation, except for magnesium chloride.

Conclusions:

  • The modified Maxwell equation accurately predicts evaporation rates for many salt solutions, accounting for time-dependent water activity.
  • Ammonium salts present an exception, with their evaporation rates unaffected by solute concentration, possibly due to specific surface phenomena.
  • The study highlights the complex interplay between solute type, concentration, and surface effects in droplet evaporation.