Institute of Fundamental Technological Research
Polish Academy of Sciences


C. Drummond

Recent publications
1.  Richter Ł., Żuk P.J., Szymczak P., Paczesny J., Bąk K.M., Szymborski T., Garstecki P., Stone H.A., Hołyst R., Drummond C., Ions in an AC electric field: strong long-range repulsion between oppositely charged surfaces, PHYSICAL REVIEW LETTERS, ISSN: 0031-9007, DOI: 10.1103/PhysRevLett.125.056001, Vol.125, No.5, pp.056001-1-5, 2020

Two oppositely charged surfaces separated by a dielectric medium attract each other. In contrast we observe a strong repulsion between two plates of a capacitor that is filled with an aqueous electrolyte upon application of an alternating potential difference between the plates. This long-range force increases with the ratio of diffusion coefficients of the ions in the medium and reaches a steady state after a few minutes, which is much larger than the millisecond timescale of diffusion across the narrow gap. The repulsive force, an order of magnitude stronger than the electrostatic attraction observed in the same setup in air, results from the increase in osmotic pressure as a consequence of the field-induced excess of cations and anions due to lateral transport from adjacent reservoirs.

Richter Ł. - other affiliation
Szymczak P. - University of Warsaw (PL)
Paczesny J. - other affiliation
Bąk K.M. - other affiliation
Szymborski T. - other affiliation
Garstecki P. - Institute of Physical Chemistry, Polish Academy of Sciences (PL)
Stone H.A. - Princeton University (US)
Hołyst R. - other affiliation
Drummond C. - other affiliation

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