4.6 Article

Charging of drops impacting onto superhydrophobic surfaces

Journal

SOFT MATTER
Volume 18, Issue 8, Pages 1628-1635

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sm01725j

Keywords

-

Funding

  1. European Research Council (ERC) under the European Union [883631]
  2. DAAD/BECAS Chile [57395809]
  3. Max Planck Society
  4. European Research Council (ERC) [883631] Funding Source: European Research Council (ERC)

Ask authors/readers for more resources

When neutral water drops impact and rebound from superhydrophobic surfaces, they acquire a positive electrical charge. The maximum contact area is identified as the dominant control parameter for charge separation.
When neutral water drops impact and rebound from superhydrophobic surfaces, they acquire a positive electrical charge. To measure the charge, we analyzed the trajectory of rebounding drops in an external electric field by high-speed video imaging. Although this charging phenomenon has been observed in the past, little is known about the controlling parameters for the amount of drop charging. Here we investigate the relative importance of five of these potential variables: impact speed, drop contact area, contact line retraction speed, drop size, and type of surface. We additionally apply our previously reported model for sliding drop electrification to the case of impacting drops, suggesting that the two cases contain the same charge separation mechanism at the contact line. Both our experimental results and our theoretical model indicate that maximum contact area is the dominant control parameter for charge separation.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available