TY - JOUR
T1 - Particle Stabilization of Oil-Fluorocarbon Interfaces and Effects on Multiphase Oil-in-Water Complex Emulsion Morphology and Reconfigurability
AU - Cheon, Seong Ik
AU - Batista Capaverde Silva, Leonardo
AU - Ditzler, Rachael
AU - Zarzar, Lauren D.
N1 - Funding Information:
We gratefully acknowledge funding from the Army Research Office grant W911NF-18-1-0414, NSF-REU grant CHE-1659679, and 3M Corporation.
Funding Information:
We gratefully acknowledge support from the Department of Chemistry and the Materials Research Institute at Penn State.
Funding Information:
We gratefully acknowledge funding from the Army Research Office grant W911NF-18-1-0414, NSF-REU grant CHE-1659679, and 3M Corporation. We gratefully acknowledge support from the Department of Chemistry and the Materials Research Institute at Penn State.
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/6/30
Y1 - 2020/6/30
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85087434897
UR - https://www.scopus.com/pages/publications/85087434897#tab=citedBy
U2 - 10.1021/acs.langmuir.9b03830
DO - 10.1021/acs.langmuir.9b03830
M3 - Article
C2 - 31991080
AN - SCOPUS:85087434897
SN - 0743-7463
VL - 36
SP - 7083
EP - 7090
JO - Langmuir
JF - Langmuir
IS - 25
ER -