oc0c00686_si_008.mp4 (2.1 MB)
Controlled Movement of Complex Double Emulsions via Interfacially Confined Magnetic Nanoparticles
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posted on 2020-07-02, 17:04 authored by Cassandra
A. Zentner, Alberto Concellón, Timothy M. SwagerControlled, dynamic movement of materials
through noncontacting
forces provides interesting opportunities in systems design. Confinement
of magnetic nanoparticles to the interfaces of double emulsions introduces
exceptional control of double emulsion movement. We report the selective
magnetic functionalization of emulsions by the in situ selective reactions of amine-functionalized magnetic nanoparticles
and oil-soluble aldehydes at only one of the double emulsion’s
interfaces. We demonstrate morphology-dependent macroscopic ferromagnetic
behavior of emulsions induced by the interfacial confinement of the
magnetic nanoparticles. The attraction and repulsion of the emulsions
to applied magnetic fields results in controlled orientation changes
and rotational movement. Furthermore, incorporation of liquid crystals
into the double emulsions adds additional templating capabilities
for precision assembly of magnetic nanoparticles, both along the interface
and at point defects. Applying a magnetic field to liquid crystal
complex emulsions can produce movement as well as reorganization of
the director field in the droplets. The combination of interfacial
chemistry and precise assembly of magnetic particles creates new systems
with potentially useful field-responsive properties.
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templating capabilitiessystems designComplex Double EmulsionsnanoparticleControlled Movementprecision assemblyorientation changesNanoparticles Controlledemulsion movementfields resultsnoncontacting forcesoil-soluble aldehydespoint defectsinterfacemorphology-dependent macroscopicdirector fieldfield-responsive propertiesInterfacially Confined
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