The interplay between nanoscale dipoles and ion screening drives the self-regulation of charged aqueous surfaces
Rattachement africain : it, fr. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
HYPOTHESIS: Electrostatic interactions at aqueous interfaces play a central role in controlling the organization and stability of charged particle-laden films. In particular, the explicit dependence of interfacial electrostatics on ionic strength and ion valence might enable to both finely modulate the structure and properties of charged aqueous surfaces and to better understand the interfacial partitioning of electrolytes. This requires a comprehensive characterization of the electrostatic properties at both the nano and macroscale. EXPERIMENTS: Here, we combine in situ grazing-incidence small-angle X-ray scattering (GISAXS), Langmuir compression isotherms, and vibrating-plate surface potential measurements to investigate the interfacial electrostatics of model negatively charged silica nanoparticles adsorbed at the air-water interface in the presence of mono-, di-, and trivalent electrolytes at various ionic strengths. FINDINGS: J), independently of ionic strength and ion identity. Variations in electrolyte composition instead control the nanoparticle surface excess, which adjusts to compensate changes in the interfacial dipolar strength. Further, both the interfacial dipole moment and the effective screening constant follow ion-independent power-law scaling with ionic strength, while ion-specific effects appear only as concentration-independent pre-factors. These results i) demonstrate that electrostatic interactions at the interface are governed by a confined electrolyte environment which deviates from classical bulk mean-field predictions and ii) provide a quantitative framework for predicting and tuning the structure and stability of charged aqueous interfaces.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- The interplay between nanoscale dipoles and ion screening drives the self-regulation of charged aqueous surfaces
- Date Crossref
- 01/09/2026
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase pays non établi dans la noticeStructure de recherche
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University of Catania Department of Chemical Sciences pays non établi dans la noticeUniversité ou école supérieure
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Institute of Condensed Matter Chemistry and Technologies for Energy Italian National Research Council (CNR) pays non établi dans la noticeStructure de recherche
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Synchrotron SOLEIL pays non établi dans la noticeStructure de recherche
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European Synchrotron Radiation Facility pays non établi dans la noticeStructure de recherche
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French National Synchrotron Facility SOLEIL pays non établi dans la noticeInstitution
Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Department of Chemical Sciences — University of Catania et Italian National Research Council (CNR) — Institute of Condensed Matter Chemistry and Technologies for Energy, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.