R. R. Raju, J. Koetz
Inner Rotation of Pickering Janus Emulsions
Nanomaterials 2021, 11, 3312
DOI: 10.3390/nano11123312
Janus droplets were prepared by vortex mixing of 3 non-mixable liquids, i.e. olive oil, silicone oil and water in presence of gold nanoparticles (AuNPs) in the aqueous phase and magnetite nanoparticles (MNPs) in olive oil. The resulting Pickering emulsions were stabilized by a red colored AuNP layer at the olive oil/water interface and MNPs at the oil/oil interface. The core-shell droplets can be stimulated by an external magnetic field. Surprisingly, an inner rotation of the silicon droplet is observed, when MNPs are fixed at the inner silicon droplet interface. This is a first example of a controlled movement of the inner part of complex double emulsions by magnetic manipulations via interfacially confined magnetic nanoparticles.
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