Measurement and accumulation of electric charge on a single dielectric particle trapped in air
Thomas W. LeBrun, Haesung Park
Normally occurring charges on small particles provide a means to control the motion of the particles. Using a piezoelectric- based resonator to launch microparticles into a trap, we can vary particle-surface interactions to transfer charge to the particle via contact electrification. This allows more detailed studies of contact electrification itself as well generation of higher charge states for precision measurements of force or nonlinear dynamics using electric field modulation. In practice, particles may be repeatedly landed on the substrate and relaunched during loading. This leads to charge transfer so that the net charge on the polystyrene (PS) particle becomes sufficient to allow electrostatic forcing to drive ballistic motion over a range of displacement two orders of magnitude greater than thermal fluctuations. An increase in charge from 1000 to 3000 electrons is demonstrated and the induced motion of the trapped particle is accurately described using simple classical mechanics in phase space.
and Park, H.
Measurement and accumulation of electric charge on a single dielectric particle trapped in air, SPIE OptoWest, San Francisco, CA, [online], https://doi.org/10.1117/12.2213055
(Accessed December 7, 2023)