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, F.M., Boubeta, F.M., Azzaroni, O., Szleifer, I., Tagliazucchi, M.
Formato: JOUR
Materias:
Adsorption
Free energy
Nanoparticles
Nanorods
Adsorption equilibria
Effective charge
Low salt concentration
Polyelectrolyte adsorption
Polyelectrolyte chain
Salt concentration
Surface curvatures
Total free energy
Polyelectrolytes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_19327447_v122_n12_p6669_Gilles
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_19327447_v122_n12_p6669_Gilles
record_format dspace
spelling todo:paper_19327447_v122_n12_p6669_Gilles2023-10-03T16:36:07Z Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature Gilles, F.M. Boubeta, F.M. Azzaroni, O. Szleifer, I. Tagliazucchi, M. Adsorption Free energy Nanoparticles Nanorods Adsorption equilibria Effective charge Low salt concentration Polyelectrolyte adsorption Polyelectrolyte chain Salt concentration Surface curvatures Total free energy Polyelectrolytes 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. © 2018 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_19327447_v122_n12_p6669_Gilles
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Adsorption
Free energy
Nanoparticles
Nanorods
Adsorption equilibria
Effective charge
Low salt concentration
Polyelectrolyte adsorption
Polyelectrolyte chain
Salt concentration
Surface curvatures
Total free energy
Polyelectrolytes
spellingShingle Adsorption
Free energy
Nanoparticles
Nanorods
Adsorption equilibria
Effective charge
Low salt concentration
Polyelectrolyte adsorption
Polyelectrolyte chain
Salt concentration
Surface curvatures
Total free energy
Polyelectrolytes
Gilles, F.M.
Boubeta, F.M.
Azzaroni, O.
Szleifer, I.
Tagliazucchi, M.
Modulation of Polyelectrolyte Adsorption on Nanoparticles and Nanochannels by Surface Curvature
topic_facet Adsorption
Free energy
Nanoparticles
Nanorods
Adsorption equilibria
Effective charge
Low salt concentration
Polyelectrolyte adsorption
Polyelectrolyte chain
Salt concentration
Surface curvatures
Total free energy
Polyelectrolytes
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. © 2018 American Chemical Society.
format JOUR
author Gilles, F.M.
Boubeta, F.M.
Azzaroni, O.
Szleifer, I.
Tagliazucchi, M.
author_facet Gilles, F.M.
Boubeta, F.M.
Azzaroni, O.
Szleifer, I.
Tagliazucchi, M.
author_sort Gilles, F.M.
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
url http://hdl.handle.net/20.500.12110/paper_19327447_v122_n12_p6669_Gilles
work_keys_str_mv AT gillesfm modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
AT boubetafm modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
AT azzaronio modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
AT szleiferi modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
AT tagliazucchim modulationofpolyelectrolyteadsorptiononnanoparticlesandnanochannelsbysurfacecurvature
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