Cross-linked poly(4‐vinylpyridine) particles ...
Document type :
Article dans une revue scientifique: Article original
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Title :
Cross-linked poly(4‐vinylpyridine) particles for pH- and ionic strength-responsive “on–off” Pickering emulsions
Author(s) :
Douyère, Grégory [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Leclercq, Loïc [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nardello-Rataj, Véronique [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Leclercq, Loïc [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nardello-Rataj, Véronique [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Journal title :
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume number :
631
Pages :
127705
Publisher :
Elsevier
Publication date :
2021-12-20
ISSN :
0927-7757
English keyword(s) :
poly(4-vinylpyridine)
pH-sensitive polymers
Pickering emulsions
amphiphilic particles
charge density modification
pH-sensitive polymers
Pickering emulsions
amphiphilic particles
charge density modification
HAL domain(s) :
Chimie/Chimie organique
English abstract : [en]
Poly(4-vinylpyridine) particles, P4VP, show a great potential from the environmental and economic perspective since they are cheap and extensively used for safer and greener organic syntheses. Moreover, their pH-sensitive ...
Show more >Poly(4-vinylpyridine) particles, P4VP, show a great potential from the environmental and economic perspective since they are cheap and extensively used for safer and greener organic syntheses. Moreover, their pH-sensitive properties would make it easy to obtain “on-off”, recyclable and reusable Pickering emulsions. The relationships between particle structures (size, shape, acidity and charge) and emulsion properties (type, droplet size and stability against environmental stresses) were investigated. The protonation increased the particles diameter to 147 nm compared to the pristine ones (88 nm) due to electrostatic repulsions which swell the particles. The ζ-potential was decreased with increasing acidity (from +60 to +30 mV) due to the accumulation of chlorides onto the surface. Thus, the acidic particles of 39 mmolH+/g and +57 mV were more effective in emulsifying heptane in water with long-term stability in storage conditions (up to one year) and unprecedented resistance against centrifugation and temperature (up to 5000 rpm and 60 °C). Nevertheless, destabilization can be easily achieved by pH or ionic strength changes facilitating the phase separation and the particles recovery. Contrary to the literature of responsive Pickering emulsions, which require relatively complex systems, the investigated one provides a simple route to obtain various “on-off” switches using P4VP cross-linked particles which possess changeable structures based on electrostatic repulsions. Consequently, the exploitation of such a system could be attractive in biphasic media in which the P4VP would act as a reagent, scavenger, and/or catalyst.Show less >
Show more >Poly(4-vinylpyridine) particles, P4VP, show a great potential from the environmental and economic perspective since they are cheap and extensively used for safer and greener organic syntheses. Moreover, their pH-sensitive properties would make it easy to obtain “on-off”, recyclable and reusable Pickering emulsions. The relationships between particle structures (size, shape, acidity and charge) and emulsion properties (type, droplet size and stability against environmental stresses) were investigated. The protonation increased the particles diameter to 147 nm compared to the pristine ones (88 nm) due to electrostatic repulsions which swell the particles. The ζ-potential was decreased with increasing acidity (from +60 to +30 mV) due to the accumulation of chlorides onto the surface. Thus, the acidic particles of 39 mmolH+/g and +57 mV were more effective in emulsifying heptane in water with long-term stability in storage conditions (up to one year) and unprecedented resistance against centrifugation and temperature (up to 5000 rpm and 60 °C). Nevertheless, destabilization can be easily achieved by pH or ionic strength changes facilitating the phase separation and the particles recovery. Contrary to the literature of responsive Pickering emulsions, which require relatively complex systems, the investigated one provides a simple route to obtain various “on-off” switches using P4VP cross-linked particles which possess changeable structures based on electrostatic repulsions. Consequently, the exploitation of such a system could be attractive in biphasic media in which the P4VP would act as a reagent, scavenger, and/or catalyst.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Research team(s) :
Colloïdes catalyse oxydation (CÏSCO)
Submission date :
2022-03-24T09:02:42Z
2023-05-09T08:59:42Z
2023-12-14T18:51:08Z
2023-05-09T08:59:42Z
2023-12-14T18:51:08Z
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