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Issue 29, 2013
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One-step preparation of magnetic Janus particles using controlled phase separation of polymer blends and nanoparticles

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Abstract

We present a simple method with the aid of a microfluidic droplet-generation technique to fabricate magnetic Janus particles by utilizing a solvent evaporation-induced phase separation and preferential partitioning of magnetic nanoparticles in the polymer blends. Non-aqueous emulsion droplets of the polymer blends and nanoparticles solution are produced to become Janus particles after the evaporation of the solvent. The stabilizing polymer of the nanoparticles, which is compatible only with one of the polymer blends to be phase-separated, plays a key role in the anisotropic positioning of the nanoparticles in the Janus particles. Using this phase separation-based method and microfluidics, excellent control over the size, size distribution, and morphology of the particles is achieved. Especially, we could control the morphology of the Janus particles easily by varying the volume ratio of the polymers. However, with an analysis of the shapes of resulting Janus particles, we found that non-equilibrium aspects of the evaporation-induced phase separation play a major role in determining the particle morphology. We expect that the versatility of this method in the choice of polymer blends and functional nanoparticles will enable the fabrication of colloids with various functionality and desired morphology.

Graphical abstract: One-step preparation of magnetic Janus particles using controlled phase separation of polymer blends and nanoparticles

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Publication details

The article was received on 21 Mar 2013, accepted on 15 May 2013 and first published on 15 May 2013


Article type: Paper
DOI: 10.1039/C3RA41394B
Citation: RSC Adv., 2013,3, 11801-11806
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    One-step preparation of magnetic Janus particles using controlled phase separation of polymer blends and nanoparticles

    J. Jeong, E. Um, J. Park and M. W. Kim, RSC Adv., 2013, 3, 11801
    DOI: 10.1039/C3RA41394B

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