Pickering emulsions with stimulable particles: from highly- to weakly-covered interfaces.
We study oil-in-water emulsions stabilised by pH-sensitive colloidal silica or latex particles. Depending on the composition of the continuous phase, the same type of particles and the same emulsification process lead to emulsions characterised either by large drops densely covered by the particles, or to small droplets which are weakly covered. The two kinetically stable states can be tuned reversibly by using pH or salinity as compositional stimuli. We examine the emulsions' behaviour in these two limiting cases and we discuss the possible mechanisms allowing stabilisation, especially in the case of low surface coverage.
Université Bordeaux 1, Centre de Recherche Paul Pascal, CNRS UPR 8641, Avenue du Dr Albert Schweitzer, 33600, Pessac, France.
Florent
F
Gautier
Mathieu
M
Destribats
Romain
R
Perrier-Cornet
Jean-François
JF
Dechézelles
Joanna
J
Giermanska
Valérie
V
Héroguez
Serge
S
Ravaine
Fernando
F
Leal-Calderon
Véronique
V
Schmitt
D003102:Colloids; D004655:Emulsions / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007840:Latex / Q000737:chemistry*; D009821:Oils / Q000737:chemistry; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D003102:Colloids; D004655:Emulsions; D007840:Latex; D009821:Oils; D014867:Water; D012822:Silicon Dioxide