Particle Stabilization of Oil–Fluorocarbon
Interfaces and Effects on Multiphase Oil-in-Water Complex Emulsion
Morphology and Reconfigurability
Seong
Ik Cheon
Leonardo Batista Capaverde Silva
Rachael Ditzler
Lauren D. Zarzar
10.1021/acs.langmuir.9b03830.s001
https://acs.figshare.com/articles/journal_contribution/Particle_Stabilization_of_Oil_Fluorocarbon_Interfaces_and_Effects_on_Multiphase_Oil-in-Water_Complex_Emulsion_Morphology_and_Reconfigurability/11823741
Stabilization
of oil–oil interfaces is important for nonaqueous
emulsions as well as for multiphase oil-in-water emulsions, with relevance
to a variety of fields ranging from emulsion polymerization to sensors
and optics. Here, we focus on examining the ability of functionalized
silica particles to stabilize interfaces between fluorinated oils
and other immiscible oils (such as hydrocarbons and silicones) in
nonaqueous emulsions and also on the particles’ ability to
affect the morphology and reconfigurability of complex, biphasic oil-in-water
emulsions. We compare the effectiveness of fluorophilic, lipophilic,
and bifunctional fluorophilic-lipophilic coated nanoparticles to stabilize
these oil–oil interfaces. Sequential bulk emulsification steps
by vortex mixing, or emulsification by microfluidics, can be used
to create complex droplets in which particles stabilize the oil–oil
interfaces and surfactants stabilize the oil–water interfaces.
We examine the influence of particles adsorbed at the internal oil–oil
interface in complex droplets to hinder the reconfiguration of these
complex emulsions upon addition of aqueous surfactants, creating “metastable”
droplets that resist changes in morphology. Such metastable droplets
can be triggered to reconfigure when heated above their upper critical
solution temperature. Thus, not only do these bifunctional silica
particles enable the stabilization of a broad array of oil-fluorocarbon
nonaqueous emulsions, but the ability to address the oil–oil
interface within complex O/O/W droplets expands the diversity of oil
chemical choices available and the accessibility of droplet morphologies
and sensitivity.
2020-02-07 16:46:13
Multiphase Oil-in-Water Complex Emulsion Morphology
biphasic oil-in-water emulsions
nonaqueous emulsions
oil-fluorocarbon nonaqueous emulsions
Sequential bulk emulsification steps
multiphase oil-in-water emulsions
interface
oil chemical choices
Such metastable droplets
bifunctional silica particles
functionalized silica particles