A microfluidic process for on-chip formation of assemblies of oxide nanoparticles

We report the continuous growth of spherical assemblies of silica and titania nanoparticles, which were pre-activated to produce hydroxyl/ peroxy groups on their surface, by flowing a colloid-in-dioctyl phthalate emulsion into a polydimethylsiloxane microfluidic chip, which is held at a temperature of 120-130 degrees C. When the colloidal microdroplets enter the chip, the instantaneous heating results in vapour-based convective agitation and emulsion breakup, leading to microdroplet fusion and subsequent merging of their nanoparticle content. This progressively results in a robust large assembly obtained after sintering at 600 degrees C owing to strong chemical interparticle bonds.


Published in:
Rsc Advances, 4, 69, 36725-36728
Year:
2014
Publisher:
Cambridge, Royal Soc Chemistry
ISSN:
2046-2069
Laboratories:




 Record created 2014-10-23, last modified 2018-09-13


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