Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature

This paper presents theoretical results on the adsorption of polyelectrolyte chains on surfaces with opposite charge and nanoscale curvature. The theory predicts that increasing the surface curvature can either increase or decrease the amount of adsorbed polyelectrolyte, depending on the type of cur...

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Detalles Bibliográficos
Autores principales:	Gilles, Facundo Matías, Boubeta, Fernando Martín, Azzaroni, Omar, Szleifer, Igal, Tagliazucchi, Mario Eugenio
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2018
Materias:	Química Polyelectrolite Nanoparticles Nanochannels
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/96507 https://ri.conicet.gov.ar/11336/88732 http://pubs.acs.org/doi/10.1021/acs.jpcc.7b12841
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-96507
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Química Polyelectrolite Nanoparticles Nanochannels
spellingShingle	Química Polyelectrolite Nanoparticles Nanochannels Gilles, Facundo Matías Boubeta, Fernando Martín Azzaroni, Omar Szleifer, Igal Tagliazucchi, Mario Eugenio Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
topic_facet	Química Polyelectrolite Nanoparticles Nanochannels
description	This paper presents theoretical results on the adsorption of polyelectrolyte chains on surfaces with opposite charge and nanoscale curvature. The theory predicts that increasing the surface curvature can either increase or decrease the amount of adsorbed polyelectrolyte, depending on the type of curvature (convex or concave) and whether the polyelectrolyte undercompensates or overcompensates the initial charge of the substrate. For small bulk salt concentration (10-4 M), increasing the curvature of the surface displaces the adsorption equilibrium of the polyelectrolyte in order to decrease the absolute value of the effective charge density for concave surfaces (nanochannels) or to increase it for convex surfaces (nanoparticles). This behavior is traced back to the dependence of the total free energy as a function of the curvature of the surface. For intermediate salt concentrations (0.01-0.1 M), the magnitude of the effect is larger than that for low salt concentrations, although the general picture becomes more complex due to the fact that the added salt competes with the polycation to screen the negative charge of the substrate. It is argued that the effect under discussion will be relevant for nano-objects that have different radii or type of curvature at different locations (i.e. conical nanochannels or cylindrical nanorods with hemispherical tips) as our theory predicts inhomogeneous polyelectrolyte adsorption on their surfaces.
format	Articulo Preprint
author	Gilles, Facundo Matías Boubeta, Fernando Martín Azzaroni, Omar Szleifer, Igal Tagliazucchi, Mario Eugenio
author_facet	Gilles, Facundo Matías Boubeta, Fernando Martín Azzaroni, Omar Szleifer, Igal Tagliazucchi, Mario Eugenio
author_sort	Gilles, Facundo Matías
title	Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
title_short	Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
title_full	Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
title_fullStr	Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
title_full_unstemmed	Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
title_sort	modulation of polyelectrolyte adsorption on nanoparticles and nanochannels by surface curvature
publishDate	2018
url	http://sedici.unlp.edu.ar/handle/10915/96507 https://ri.conicet.gov.ar/11336/88732 http://pubs.acs.org/doi/10.1021/acs.jpcc.7b12841
work_keys_str_mv	AT gillesfacundomatias modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature AT boubetafernandomartin modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature AT azzaroniomar modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature AT szleiferigal modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature AT tagliazucchimarioeugenio modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
bdutipo_str	Repositorios
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Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature

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