Oil-in-water Pickering emulsions stabilized by phyllosilicates at high solid content

David Kpogbémabou; Gisèle Laure Lecomte-Nana; Anne Aimable; Marguerite Bienia; Volga Niknam; Claire Carrion

Oil-in-water Pickering emulsions stabilized by phyllosilicates at high solid content

David Kpogbémabou ^{1, 2} Gisèle Laure Lecomte-Nana ² Anne Aimable ¹ Marguerite Bienia ¹ Volga Niknam ² Claire Carrion ³

1 SPCTS-AXE1 - Axe 1 : procédés céramiques

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

2 GEMH - Groupe d'Etudes des Matériaux Hétérogènes

3 CRIBL - Contrôle de la Réponse Immune B et des Lymphoproliférations

Abstract : The present study aims at investigating the preparation and characterization of oil-in-water (O/W) Pickering emulsions stabilized using three different phyllosilicates: kaolin, halloysite, and palygorskite, and at high solid content (15 wt.% in the aqueous phase). Stable O/W emulsions could be obtained with no additional surfactant or surface treatment. The maximal oil fraction that could be introduced without phase separation was determined. The resulting oil/water ratios of 0.32, 0.44 and 0.60 were found for kaolin, halloysite and palygorskite, respectively. The O/W character of the three emulsions was confirmed by a simple “droplet test” and by confocal microscopy, which confirmed the positioning of the clay particles at the oil/water interface. These three phyllosilicates led to a limited coalescence mechanism that promoted the long-term stability of the Pickering emulsions. The rheological behavior of these emulsions was studied and showed that halloysite led to a more rigid structure. This trend could be justified by the formation of a strong network of clay particles due to strong surface interactions combined with an elongated particle shape.

Keywords : Rheology Stability Pickering emulsion Phyllosilicates

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Chimie

Sciences de l'ingénieur [physics]

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https://hal-unilim.archives-ouvertes.fr/hal-01108385
Contributeur : Anne Aimable <>
Soumis le : jeudi 5 février 2015 - 15:54:25
Dernière modification le : jeudi 15 mars 2018 - 11:22:57

Oil-in-water Pickering emulsions stabilized by phyllosilicates at high solid content

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Oil-in-water Pickering emulsions stabilized by phyllosilicates at high solid content

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