Johnsen–Rahbek effect

The Johnsen–Rahbek effect occurs when an electric potential is applied across the boundary between a metallic surface and the surface of a semiconducting material or a polyelectrolyte. Under these conditions an attractive force appears, whose magnitude depends on the voltage and the specific materials involved. The attractive force is much larger than would be produced by Coulombic attraction.

The effect is named after Danish engineers F. A. Johnsen and K. Rahbek, the first to investigate the effect at length.

External links

• Johnsen, A.; Rhabek, K (1923). "A physical phenomenon and its applications to telegraphy, telephony, etc". Journal of the Institution of Electrical Engineers: 713–725.
• Levine, D. J.; Turner, K. T.; Pikul, J.H. (2021). "Materials with electroprogrammable stiffness". Advanced Materials. 33 (35): 2007952.
• Fitch, C. J. (1957). "Development of the Electrostatic Clutch". IBM Journal of Research and Development. 1 (1). IBM: 49–56. doi:10.1147/rd.11.0049. ISSN 0018-8646.
• "Edison's Loud-Speaking Telephone"
• Atkinson, R (1969-03-01). "A simple theory of the Johnsen-Rahbek effect". Journal of Physics D: Applied Physics. 2 (3). IOP Publishing: 325–332. Bibcode:1969JPhD....2..325A. doi:10.1088/0022-3727/2/3/303. ISSN 0022-3727. S2CID 250802571.