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Related Experiment Videos

Controlling charge on levitating drops.

Ryan T Hilger1, Michael S Westphall, Lloyd M Smith

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA.

Analytical Chemistry
|June 22, 2007
PubMed
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This study introduces a novel method to precisely control the charge on levitating drops using acoustic levitation and charged drop dispensers. This technique allows for adjustable charge amount and polarity, aiding in advanced material processing and particle studies.

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Levitation technologies are crucial for containerless processing, microscale manipulation, and studying individual drops and particles.
  • Precise control over the charge of levitating particles is essential for many advanced applications.

Purpose of the Study:

  • To develop and demonstrate a method for controlling the amount and polarity of electric charge on a single levitating drop.
  • To enable new possibilities in the manipulation and study of charged microscale objects.

Main Methods:

  • Utilizing single-axis acoustic levitation to trap drops with diameters ranging from 400 micrometers to 2 mm.
  • Employing a piezoelectric drop-on-demand dispenser with a charging electrode to add discrete packets of charged drops.

Related Experiment Videos

  • Adjusting the charge magnitude by varying the voltage on the charging electrode and controlling polarity.

    • Main Results:

    • Demonstrated controllable charging of levitating drops.
    • Achieved adjustable charge magnitude and polarity, including neutralization and reversal.
    • Identified charge repulsion as a limiting factor for the maximum added charge.

    Conclusions:

    • The developed charging scheme offers precise control over the electrostatic properties of levitating drops.
    • This method significantly advances capabilities in micromanipulation and the study of charged particles and drops.
    • Opens new avenues for research in fields requiring controlled electrostatic interactions at the microscale.