Adsorption of poly(methacrylic acid) onto differently charged silica nanoparticles and its consequences on particles clustering

Autor: Clément Robin, Cédric Lorthioir, Azad Erman, Javier Perez, Abdoulaye Fall, Guillaume Ovarlez, Catherine Amiel, Clémence Le Cœur
Přispěvatelé: Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Spectroscopie, Modélisation, Interfaces pour L'Environnement et la Santé (LCMCP-SMiLES), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Navier (NAVIER UMR 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Université de Bordeaux (UB), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratory of Future (LOF), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)-Solvay (France), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Université de Bordeaux (UB)-Solvay (France)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2022, 638, pp.128287. ⟨10.1016/j.colsurfa.2022.128287⟩
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2022, 638, pp.128287. ⟨10.1016/j.colsurfa.2022.128287⟩
ISSN: 0927-7757
DOI: 10.1016/j.colsurfa.2022.128287⟩
Popis: International audience; This work aims at gaining a comprehensive picture of the interactions between three differently functionalized silica nanoparticles and a polyacid-PMAA namelyin aqueous media. Native silica nanoparticles and silica nanoparticles functionalized with amine or quaternary amine groups are either negatively or positively charged with various charge densities whereas PMAA chains display an increasing negative charge density as the pH is increased from 3 to 9. Adsorption isotherms were obtained by Total Organic Carbon (TOC). It was shown that native silica interacts only weakly with PMAA while stronger adsorptions were evidenced for the two amine-functionalized silica. Whereas electrostatic attractive interactions between positivelycharged surfaces and negatively-charged PMAA are driving the adsorption at pH larger than 3, hydrophobic interactions between the propyl moieties of the grafts at the silica surfaces and the methyl groups of the PMAA hypercoils are dominating at low pH value. In this last case, the more hydrophobic the silica surface is, the higher the adsorption. Contrary to expectations, hydrophobic interactions (dominating at low pH) seem to be stronger than attractive electrostatic interactions (dominating at pH larger than 3) as adsorbed amounts are larger in the first case. Small-angle X-ray scattering experiments were performed on PMAA/silica dispersions under the condition of saturation adsorption in order to correlate the extent of particle dispersion with polymer/surface interactions. The stronger the polymer/surface interactions, the more compact aggregates are formed.
Databáze: OpenAIRE
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