Document
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National Science Foundation, NSF: DMR-0520513
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funding vehicle for: Entropic effects in the electric double layer of model colloids with size-asymmetric monovalent ions

Continuant
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Entity
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Journal of Chemical Physics
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type: Document
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type: Continuant
publication venue for: Entropic effects in the electric double layer of model colloids with size-asymmetric monovalent ions
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type: Periodical
type: Thing
type: Journal
type: Information Content Entity

Entropic effects in the electric double layer of model colloids with size-asymmetric monovalent ions
type: Article
related by: authorship_16213
most specific type: Document
estado: published
has funding vehicle: Consejo Nacional de Ciencia y Tecnología, CONACYT: CB-2006-01/58470
type: Document
type: Entity
volume: 135
accesstype: All Open Access, Green
issue: 5
has funding vehicle: National Science Foundation, NSF: DMR-0520513
artnum: 54701
date time value: article date 2763
abstract: The structure of the electric double layer of charged nanoparticles and colloids in monovalent salts is crucial to determine their thermodynamics, solubility, and polyion adsorption. In this work, we explore the double layer structure and the possibility of charge reversal in relation to the size of both counterions and coions. We examine systems with various size-ratios between counterions and coions (ion size asymmetries) as well as different total ion volume fractions. Using Monte Carlo simulations and integral equations of a primitive-model electric double layer, we determine the highest charge neutralization and electrostatic screening near the electrified surface. Specifically, for two binary monovalent electrolytes with the same counterion properties but differing only in the coions size surrounding a charged nanoparticle, the one with largest coion size is found to have the largest charge neutralization and screening. That is, in size-asymmetric double layers with a given counterions size the excluded volume of the coions dictates the adsorption of the ionic charge close to the colloidal surface for monovalent salts. Furthermore, we demonstrate that charge reversal can occur at low surface charge densities, given a large enough total ion concentration, for systems of monovalent salts in a wide range of ion size asymmetries. In addition, we find a non-monotonic behavior for the corresponding maximum charge reversal, as a function of the colloidal bare charge. We also find that the reversal effect disappears for binary salts with large-size counterions and small-size coions at high surface charge densities. Lastly, we observe a good agreement between results from both Monte Carlo simulations and the integral equation theory across different colloidal charge densities and 1:1-elec-trolytes with different ion sizes. © 2011 American Institute of Physics.
freetext keyword: Binary salts; Charge neutralization; Charge reversal; Charged nanoparticles; Colloidal charge; Colloidal surface; Counterions; Double layer structure; Double layers; Electric double layer; Electrostatic screening; Entropic effects; Excluded volume; Integral-equation theory; Ion concentrations; Ion size; Ion size asymmetry; Ionic charge; Large sizes; Model colloids; Monovalent ions; Monovalent salt; Monte Carlo Simulation; Polyion adsorption; Adsorption; Charge density; Colloid chemistry; Colloids; Electrochemistry; Entropy; Integral equations; Ions; Monte Carlo methods; Nanoparticles; Salts; Thermodynamics; Computer simulation
most specific type: Article
has publication venue: Journal of Chemical Physics
type: Continuant
origen: scopus
related by: authorship_16215
type: Information Content Entity
type: Generically Dependent Continuant
has funding vehicle: Northwestern University, NU
doi: 10.1063/1.3622046
related by: authorship_16214
e iscopus: 2-s2.0-80051701222
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crisid: 2763

Consejo Nacional de Ciencia y Tecnología, CONACYT: CB-2006-01/58470
type: Relationship
type: BFO_0000020
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type: Grant
type: Continuant
funding vehicle for: Entropic effects in the electric double layer of model colloids with size-asymmetric monovalent ions

Generically Dependent Continuant
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Northwestern University, NU
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type: BFO_0000020
type: Entity
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type: Grant
type: Continuant
funding vehicle for: Entropic effects in the electric double layer of model colloids with size-asymmetric monovalent ions

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