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Multicompartmental Janus microbeads from branched polymers by single-emulsion droplet microfluidics
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Chen, Yunhua, Nurumbetov, Gabit, Chen, Rong, Ballard, Nicholas and Bon, Stefan Antonius Franciscus (2013) Multicompartmental Janus microbeads from branched polymers by single-emulsion droplet microfluidics. Langmuir, Volume 29 (Number 41). pp. 12657-12662. doi:10.1021/la402417h ISSN 0743-7463.
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Official URL: http://dx.doi.org/10.1021/la402417h
Abstract
We describe a versatile and facile route for the preparation of Janus microbeads using single emulsion droplet-based microfluidics, in which water droplets that contain a mixture of branched poly(N-isopropylacrylamide)-co-(poly(ethylene glycol)diacrylate)-co-(methacrylic acid) and colloidal particles form the basis of our approach. The colloidal particles, poly(methyl methacrylate) microspheres or titanium dioxide particles, and iron oxide nanoparticles are spatially positioned within the water droplets through gravity and an externally applied magnetic force, respectively. Evaporation of water leads to gel formation of the branched copolymer matrix as a result of physical cross-linking through hydrogen bond interactions, fixing the spatial position of the colloidal particles. The thermo- and pH-responsive nature of the branched poly(N-isopropylacrylamide) (PNIPAm)-based copolymer allows for the disintegration of the polymer network of the Janus microbeads and a triggered release of the colloidal content at temperatures below the lower critical solution temperature (LCST) and at increased pH values.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
| Journal or Publication Title: | Langmuir | ||||||
| Publisher: | American Chemical Society | ||||||
| ISSN: | 0743-7463 | ||||||
| Official Date: | 16 September 2013 | ||||||
| Dates: |
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| Volume: | Volume 29 | ||||||
| Number: | Number 41 | ||||||
| Page Range: | pp. 12657-12662 | ||||||
| DOI: | 10.1021/la402417h | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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