Inversion of Solvent Migration in Charged Membranes

Alain Boldini, Maurizio Porfiri

Research output: Contribution to journalArticlepeer-review


We theoretically demonstrate the possibility of inversion of solvent migration in charged membranes, opposing osmosis. Inversion of solvent migration is ascribed to the finite volume of ions in the solution permeating the membrane, a quantity that has been neglected in the literature so far. We propose a model of the electrochemistry in the proximity of an electrode, illustrating the range of the molar volume of ions that can yield the inversion of solvent migration. This study poses the basis for novel applications in microfluidics, nanofluidics, and electrochemistry, along with new inquiries in biology.

Original languageEnglish (US)
Article number156001
JournalPhysical Review Letters
Issue number15
StatePublished - Oct 8 2021

ASJC Scopus subject areas

  • General Physics and Astronomy


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