NDLI: One-step fabrication of titania hollow spheres by controlled interfacial reaction in a droplet-based microfluidic system

Content Provider	Springer Nature Link
Author	Zhao, Chun Xia Middelberg, Anton P. J.
Copyright Year	2012
Abstract	We present a facile ethanol-in-oil droplet-based microfluidic approach for one-step fabrication of titania hollow spheres through controlled interfacial reaction. The method combines microfluidic generation of uniform ethanol-in-oil droplets and subsequent in situ controlled interfacial reaction within the microfluidic channel. Ethanol-based droplets are suspended in an oil continuous phase containing titanium tertabutoxide. The small amount of water in the droplet phase diffuses to the interface leading to hydrolysis and condensation, and titania solidifies around the droplet forming titania microcapsules. The vigorous reaction between titanium tetrabutoxide and water is controlled by analyzing a mass transfer model, and then by selecting suitable continuous and dispersed phases. Highly viscous paraffin oil in combination with a low-viscosity ethanol-based droplet phase facilitates the successful formation of titania at the interface rather than in the continuous phase. This research provides a new approach for the controlled fabrication of titania microcapsules having uniform particle size and unique folded and crumpled structure.
Starting Page	703
Ending Page	709
Page Count	7
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	14
Issue Number	3-4
e-ISSN	16134990
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Titania Hollow spheres Interfacial reaction Droplet-based microfluidics Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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