Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer

Lee V, James N, Waitukaitis SR, Jaeger H. 2018. Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer. Physical Review Materials. 2(3), 035602.

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Journal Article | Published | English
Author
Lee, Victor; James, Nicole; Waitukaitis, Scott RISTA ; Jaeger, Heinrich
Abstract
Electrostatic charging of insulating fine particles can be responsible for numerous phenomena ranging from lightning in volcanic plumes to dust explosions. However, even basic aspects of how fine particles become charged are still unclear. Studying particle charging is challenging because it usually involves the complexities associated with many-particle collisions. To address these issues, we introduce a method based on acoustic levitation, which makes it possible to initiate sequences of repeated collisions of a single submillimeter particle with a flat plate, and to precisely measure the particle charge in situ after each collision. We show that collisional charge transfer between insulators is dependent on the hydrophobicity of the contacting surfaces. We use glass, which we modify by attaching nonpolar molecules to the particle, the plate, or both. We find that hydrophilic surfaces develop significant positive charges after contacting hydrophobic surfaces. Moreover, we demonstrate that charging between a hydrophilic and a hydrophobic surface is suppressed in an acidic environment and enhanced in a basic one. Application of an electric field during each collision is found to modify the charge transfer, again depending on surface hydrophobicity. We discuss these results within the context of contact charging due to ion transfer, and we show that they lend strong support to OH− ions as the charge carriers.
Publishing Year
Date Published
2018-03-29
Journal Title
Physical Review Materials
Volume
2
Issue
3
Article Number
035602
IST-REx-ID
95

Cite this

Lee V, James N, Waitukaitis SR, Jaeger H. Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer. Physical Review Materials. 2018;2(3). doi:10.1103/PhysRevMaterials.2.035602
Lee, V., James, N., Waitukaitis, S. R., & Jaeger, H. (2018). Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer. Physical Review Materials. American Physical Society. https://doi.org/10.1103/PhysRevMaterials.2.035602
Lee, Victor, Nicole James, Scott R Waitukaitis, and Heinrich Jaeger. “Collisional Charging of Individual Submillimeter Particles: Using Ultrasonic Levitation to Initiate and Track Charge Transfer.” Physical Review Materials. American Physical Society, 2018. https://doi.org/10.1103/PhysRevMaterials.2.035602.
V. Lee, N. James, S. R. Waitukaitis, and H. Jaeger, “Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer,” Physical Review Materials, vol. 2, no. 3. American Physical Society, 2018.
Lee V, James N, Waitukaitis SR, Jaeger H. 2018. Collisional charging of individual submillimeter particles: Using ultrasonic levitation to initiate and track charge transfer. Physical Review Materials. 2(3), 035602.
Lee, Victor, et al. “Collisional Charging of Individual Submillimeter Particles: Using Ultrasonic Levitation to Initiate and Track Charge Transfer.” Physical Review Materials, vol. 2, no. 3, 035602, American Physical Society, 2018, doi:10.1103/PhysRevMaterials.2.035602.
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