Dielectric fluctuations and the origins of noncontact friction.
Dielectric fluctuations underlie a wide variety of physical phenomena, from ion mobility in electrolyte solutions and decoherence in quantum systems to dynamics in glass-forming materials and conformational changes in proteins. Here we show that dielectric fluctuations also lead to noncontact friction. Using high sensitivity, custom fabricated, single crystal silicon cantilevers we measure energy losses over poly(methyl methacrylate), poly(vinyl acetate), and polystyrene thin films. A new theoretical analysis, relating noncontact friction to the dielectric response of the film, is consistent with our experimental observations. This work constitutes the first direct, mechanical detection of noncontact friction due to dielectric fluctuations.
Kuehn
Seppe
S
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.
Loring
Roger F
RF
Marohn
John A
JA
D003198:Computer Simulation; D017097:Electric Impedance; D017276:Friction; D008422:Materials Testing / Q000379:methods*; D008567:Membranes, Artificial; D008956:Models, Chemical; D055095:Optics and Photonics; D013499:Surface Properties
D008567:Membranes, Artificial