Open AccessForce and current in a contact gap between single highly resistive particles: experimental observations
Author(s) -
Alpesh Laxman Vora,
Jan Stepputat,
Ulrich Riebel
Publication year - 2019
Publication title -
journal of physics communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.407
H-Index - 17
ISSN - 2399-6528
DOI - 10.1088/2399-6528/ab3e2b
Subject(s) - thermionic emission , resistive touchscreen , current (fluid) , electric field , contact force , mechanics , materials science , condensed matter physics , thermal conduction , particle (ecology) , electrical contacts , voltage , field (mathematics) , physics , optoelectronics , classical mechanics , electrical engineering , electron , composite material , thermodynamics , oceanography , quantum mechanics , geology , engineering , mathematics , pure mathematics
In case of electrical conduction through highly resistive dust layers, the generation of electrostatic adhesion force is strongly coupled to the mechanism of electrical (current) transport in the solid. High field strengths lead to a significant increase of the adhesive force. Here, more insight into the underlying mechanisms is given by experiments on the microscopic scale. An experimental arrangement is described which allows to study a particle pair subject to a strong electric field. Both the current and the force between the particles (150 μ m) can be measured as a function of voltage and gap distance. The results show an extremely complex behaviour of the contact for the case of highly resistive particles. For current transport, both gas discharges and thermionic field emission are observed, depending on the width of the contact gap and the field strength. For both the force and the current across the gap, a strongly non-linear behaviour with pronounced time effects is observed.