1 research outputs found
Micrometer-Sized Gold–Silica Janus Particles as Particulate Emulsifiers
Micrometer-sized
gold–silica Janus particles act as an effective
stabilizer of emulsions by adsorption at the oil–water interface.
The Janus particles were adsorbed at the oil–water interface
as a monolayer and stabilized near-spherical and nonspherical oil
droplets that remained stable without coalescence for longer than
one year. Gold and silica surfaces have hydrophobic and hydrophilic
features; these surfaces were exposed to oil and water phases, respectively.
In contrast, bare silica particles cannot stabilize stable emulsion,
and completed demulsification occurred within 2 h. Greater stability
of the emulsion for the Janus particle system compared to the silica
particle system was achieved by using the adsorption energy of the
Janus particles at the oil–water interface; the adsorption
energy of the Janus particles is more than 3 orders of magnitude greater
than that of silica particles. Suspension polymerization of Janus
particle-stabilized vinyl monomer droplets in the absence of any molecular-level
emulsifier in aqueous media led to nonspherical microspheres with
Janus particles on their surface. Furthermore, polymer microspheres
carrying Au femtoliter cups on their surfaces were successfully fabricated
by removal of the silica component from the Janus-particle stabilized
microspheres