Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B07: Tribocharging and the Role of Water
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 130
Sponsoring
Unit:
DSOFT
Chair: Ignaas Jimidar, Vrije universiteit Brussel; Scott Waitukaitis, IST Austria
Abstract: B07.00009 : Probing Surface Charge Densities of Evaporated Polymers*
1:06 PM–1:18 PM
Author not Attending
Presenter:
Yinfeng Xu
(King Abdullah University of Science and Technology)
Authors:
Abdulmalik Alghonaim
(King Abdullah University of Science and Technology)
Peng Zhang
(King Abdullah University of Science and Technology)
Yinfeng Xu
(King Abdullah University of Science and Technology)
Nischal Maharjan
(King Abdullah University of Science and Technology)
Jamilya Nauruzbayeva
(King Abdullah University of Science and Technology)
Himanshu Mishra
(King Abdullah University of Science and Technology)
aerosols, pipetting, emulsion stability, Kelvin dropper, and triboelectric nanogenerators. Curiously, the
origins of the electrification of water as it interfaces with common hydrophobic dielectric media, air,
hydrocarbons, and perfluorocarbons, have remained controversial. For example, the proposed
mechanisms range from the specific interfacial hydroxide or hydronium or bicarbonate ions to partial
charge transfer between water and dielectrics to environmental contamination. In 2020, Nauruzbayeva
et al., utilized a parallel plate capacitor and an electrometer to quantify the electrification of water
droplets in contact with polypropylene and perfluorinated capillaries. They demonstrated that the
electrification of water was because those solid surfaces were negatively charged, even in the air, with
an approximate surface charge density of -1 nC-cm -2 . We have utilized a Surface Force Apparatus (SFA)
to quantify surface charge densities of polymer surfaces in air and water. Protocols were developed to
deposit films of polypropylene and polytetrafluoroethylene onto ultrasmooth mica films. Force–distance
curves were obtained using the SFA and the surface charge densities were estimated in the air and
aqueous solutions. Methods to deduce the surface charge densities for polymers
in our experimental configurations will also be presented.
*HM acknowledges KAUST for financial support (BAS/1/1070-01-01).
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