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Mixing in colliding, ultrasonically levitated drops.

Edward T Chainani1, Woo-Hyuck Choi, Khanh T Ngo

  • 1Department of Chemistry, and ‡Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.

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|January 28, 2014
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Summary

Acoustic levitation enables contactless microfluidic reactions. Mixing in levitated drops is rapid, occurring within seconds, facilitating microreactor applications.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Acoustic levitation

Background:

  • Lab-in-a-drop technology using ultrasonic levitation offers contactless handling and prevents sample cross-contamination.
  • Understanding and controlling mixing within levitated drops is crucial for their application as microreactors, especially for kinetic studies.

Purpose of the Study:

  • To investigate and quantify mixing kinetics in acoustically levitated drops.
  • To assess the feasibility of using levitated drops as microreactors for chemical reactions.

Main Methods:

  • Acoustic levitation was used to suspend droplets.
  • A pulsed electrostatic delivery system introduced a secondary droplet for mixing.
  • High-speed video monitoring of a titration reaction (KOH added to HCl) visualized mixing dynamics using phenolphthalein indicator.

Main Results:

  • Spontaneous mixing in the levitated drop occurred in approximately 2 seconds.
  • The mixed droplet exhibited orbital motion around the levitator axis during homogenization.
  • Mixing in levitated drops was observed to be over an order of magnitude faster than three-dimensional diffusion.
  • Modulating the acoustic waveform did not significantly decrease mixing time.

Conclusions:

  • Acoustically levitated drops can serve as efficient microreactors with rapid mixing capabilities.
  • The contactless nature and fast mixing make this technique promising for microscale kinetic studies.
  • Further optimization may be needed to reduce mixing times beyond spontaneous diffusion-limited rates.