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  Flow-based surface decoration of microparticles with titania and other transition metal oxide nanoparticles

Miller, L. Z., Rutowski, J. J., Binns, J. A., Orts-Gil, G., McQuade, D. T., & Steinbacher, J. L. (2016). Flow-based surface decoration of microparticles with titania and other transition metal oxide nanoparticles. Journal of Flow Chemistry, 6(2), 94-100. doi:10.1556/1846.2016.00002.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-3F8D-E Version Permalink: http://hdl.handle.net/21.11116/0000-0006-65AD-6
Genre: Journal Article

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 Creators:
Miller, L. Zane, Author
Rutowski, James J., Author
Binns, Jonathan A., Author
Orts-Gil, Giullermo1, 2, Author              
McQuade, D. Tyler, Author
Steinbacher, Jeremy L. , Author
Affiliations:
1Peter H. Seeberger - Nanoparticles and Colloidal Polymers, Biomolekulare Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863307              
2Peter H. Seeberger - Automated Systems, Biomolekulare Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, Potsdam-Golm Science Park, Am Mühlenberg 1 OT Golm, 14476 Potsdam, DE, ou_1863306              

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 Abstract: We present a rapid approach for forming monodisperse silica microcapsules decorated with metal oxide nanoparticles; the silica–metal oxide composites have a hierarchical architecture and a range of compositions. The details of the method were defined using titania precursors. Silica capsules containing low concentrations of titania (<1 wt. %) were produced via an interfacial reaction using a simple mesofluidic T-junction droplet generator. Increasing the titania content of the capsules was achieved using two related, flow-based postsynthetic approaches. In the first approach, a precursor solution containing titanium alkoxides was flowed through a packed-bed of capsules. The second approach provided the highest concentration of titania (3.5 wt. %) and was achieved by evaporating titanium precursor solutions onto a capsule packed-bed using air flow to accelerate evaporation. Decorated capsules, regardless of the method, were annealed to improve the titania crystallinity and analyzed by optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (PXRD), and Fourier transform infrared (FT-IR) spectroscopy. The photocatalytic properties were then compared to a commercial nanoparticulate titania, which the microcapsule-supported titania outperformed in terms of rate of degradation of an organic dye and recyclability. Finally, the generality of the flow-based surface decoration procedures was demonstrated by synthesizing several composite transition metal oxide–silica microparticle materials.

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 Dates: 2016-04-132016-06
 Publication Status: Published in print
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 Identifiers: DOI: 10.1556/1846.2016.00002
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Title: Journal of Flow Chemistry
Source Genre: Journal
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Publ. Info: Budapest : Akadémiai Kiadó
Pages: - Volume / Issue: 6 (2) Sequence Number: - Start / End Page: 94 - 100 Identifier: ISSN: 2062-249X