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Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes

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Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes

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dc.contributor.author	Ramírez Hoyos, Patricio
dc.contributor.author	Manzanares Andreu, José Antonio
dc.contributor.author	Cervera Montesinos, Javier
dc.contributor.author	Gómez, Vicente
dc.contributor.author	Ali, Mubarak
dc.contributor.author	Pause, Isabelle
dc.contributor.author	Ensinger, Wolfgang
dc.contributor.author	Mafé, Salvador
dc.date.accessioned	2023-01-17T13:57:32Z
dc.date.available	2023-01-17T13:57:32Z
dc.date.issued	2018
dc.identifier.citation	Ramírez Hoyos, Patricio Manzanares Andreu, José Antonio Cervera Montesinos, Javier Gómez, Vicente Ali, Mubarak Pause, Isabelle Ensinger, Wolfgang Mafé, Salvador 2018 Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes Journal of Membrane Science 563 633 642
dc.identifier.uri	https://hdl.handle.net/10550/84990
dc.description.abstract	We consider the screening of the negative charges (carboxylic acid groups) fixed on the surface of a conical-shaped track-etched nanopore by divalent magnesium (Mg2+) and trivalent lanthanum (La3+). The experimental current (I)-voltage (V) curves and current rectification ratios allow discussing fundamental questions about the overcompensation of spatially-fixed charges by multivalent ions over nanoscale volumes. The effects of charge inversion or reversal on nanopore transport are discussed in mixtures of asymmetric electrolytes (LaCl3 and MgCl2 with KCl). In particular, pore charge inversion is demonstrated for La3+ as well as for mixtures of this trivalent ion at low concentrations with monovalent potassium (K+) and divalent Mg2+ ions at biologically relevant concentrations. It is found that small concentrations of multivalent ions can modulate the nanopore rectification and the transport of other majority ions in the solution. We study also the kinetics of the nanopore electrical recovery when the electrolyte solutions bathing the single-pore membrane are changed and show the hysteretic effects observed in the I-V curves. Finally, we describe the hysteresis observed in the I-V curves of CaCl2, MgCl2, and BaCl2 and mixtures. We also give a qualitative description of the effects of charge reversal on the pore rectification using the Nernst-Planck flux equations for multivalent ion mixtures.
dc.language.iso	eng
dc.relation.ispartof	Journal of Membrane Science, 2018, vol. 563, p. 633-642
dc.subject	Nanotecnologia
dc.subject	Materials
dc.title	Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes
dc.type	journal article	es_ES
dc.date.updated	2023-01-17T13:57:33Z
dc.identifier.doi	10.1016/j.memsci.2018.06.032
dc.identifier.idgrec	128654
dc.rights.accessRights	open access	es_ES