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dc.contributor.authorMoncho Jordá, Arturo 
dc.contributor.authorAdroher Benítez, Irene 
dc.date.accessioned2025-01-30T08:20:45Z
dc.date.available2025-01-30T08:20:45Z
dc.date.issued2014-05-20
dc.identifier.citationSoft Matter, 2014,10, 5810-5823es_ES
dc.identifier.urihttps://hdl.handle.net/10481/101066
dc.description.abstractIn this work we have performed a theoretical study of a system formed by ionic microgels in the presence of monovalent salt with the help of Ornstein–Zernike integral equations within the hypernetted-chain (HNC) approximation. We focus in particular on analysing the role that the short-range specific interactions between the polymer fibres of the microgel and the incoming ions have on the equilibrium ion distribution inside and outside the microgel. For this purpose, a theoretical model based on the equilibrium partitioning effect is developed to determine the interaction between the microgel particle and a single ion. The results indicate that when counterions are specifically attracted to the polymer fibres of the microgel, an enhanced counterion accumulation occurs that induces the charge inversion of the microgel and a strong increase of the microgel net charge (or overcharging). In the case of coions, the specific attraction is also able to provoke the coion adsorption even though they are electrostatically repelled, and so increasing the microgel charge (true overcharging). Moreover, we show that ion adsorption onto the microgel particle is very different in swollen and shrunken states due to the competition between specific attraction and steric repulsion. In particular, ion adsorption occurs preferentially in the internal core of the particle for swollen states, whereas it is mainly concentrated in the external shell for de-swollen configurations. Finally, we observe the existence of a critical salt concentration, where the net charge of the microgels vanishes; above this inversion point the net charge of the microgels increases again, thus leading to reentrant stability of microgel suspensions.es_ES
dc.description.sponsorshipMinisterio de Economı́a y Competitividad (project MAT2012-36270-C04-02)es_ES
dc.language.isoenges_ES
dc.publisherRoyal Society of Chemistryes_ES
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleIon permeation inside microgel particles induced by specific interactions: from charge inversion to overcharginges_ES
dc.typejournal articlees_ES
dc.rights.accessRightsopen accesses_ES
dc.identifier.doi10.1039/C4SM00243A
dc.type.hasVersionAMes_ES


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internacional