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Membrane potential of single asymmetric nanopores: Divalent cations and salt mixtures

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Membrane potential of single asymmetric nanopores: Divalent cations and salt mixtures

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dc.contributor.author	Ramírez Hoyos, Patricio
dc.contributor.author	Cervera Montesinos, Javier
dc.contributor.author	Gómez, Vicente
dc.contributor.author	Ali, Mubarak
dc.contributor.author	Nasir, Saima
dc.contributor.author	Ensinger, Wolfgang
dc.contributor.author	Mafé, Salvador
dc.date.accessioned	2023-01-17T14:30:52Z
dc.date.available	2023-01-17T14:30:52Z
dc.date.issued	2019
dc.identifier.citation	Ramírez Hoyos, Patricio Cervera Montesinos, Javier Gómez, Vicente Ali, Mubarak Nasir, Saima Ensinger, Wolfgang Mafé, Salvador 2019 Membrane potential of single asymmetric nanopores: Divalent cations and salt mixtures Journal of Membrane Science 573 579 587
dc.identifier.uri	https://hdl.handle.net/10550/84992
dc.description.abstract	We study the electric potential difference (membrane potential) that arises across a single-pore membrane which separates two aqueous solutions at different salt concentrations. This potential difference is obtained here as the reversal potential of a conical nanopore, defined as the applied voltage needed to obtain a zero current through the membrane. To this end, different monovalent (LiCl, NaCl, KCl, and CsCl) and divalent (CaCl2, MgCl2, and BaCl2) cations are considered over a wide range of concentrations and salt mixtures for the two asymmetric nanostructure directionalities. The experimental data allows discussing fundamental questions on the interaction of the charges fixed to the pore surface with the mobile ions in solution over nanoscale volumes. In particular, we describe the effects due to (i) the relative orientation of the axial charge distribution along the pore and the externally imposed concentration gradient, (ii) the different screening of the pore negative charges by the monovalent and divalent cations, and (iii) the non-zero bi-ionic potential arising between two salts of distinct cations with a common anion at the same concentration. We have also given a quantitative description of the experimental data obtained with monovalent cations on the basis of the Poisson-Nernst-Planck formalism. In the case of the divalent cations, however, we could give only a qualitative description of the observed phenomena. Taken together, the results can contribute to the understanding of electrochemical and bioelectrical membrane processes which are regulated by the interplay between the membrane asymmetry and the ionic concentration and electrical potential gradients.
dc.language.iso	eng
dc.relation.ispartof	Journal of Membrane Science, 2019, vol. 573, p. 579-587
dc.subject	Nanotecnologia
dc.subject	Materials
dc.title	Membrane potential of single asymmetric nanopores: Divalent cations and salt mixtures
dc.type	journal article	es_ES
dc.date.updated	2023-01-17T14:30:52Z
dc.identifier.doi	10.1016/j.memsci.2018.12.043
dc.identifier.idgrec	130538
dc.rights.accessRights	open access	es_ES