Controlled self-assembly of quantum dots and block copolymers in a microfluidic device |
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Authors: | Schabas Greg Yusuf Huda Moffitt Matthew G Sinton David |
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Affiliation: | Department of Mechanical Engineering, University of Victoria, P.O. Box 3055, Stn. CSC, Victoria, British Columbia, Canada V8W 3P6. |
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Abstract: | The controlled self-assembly of polymer-stabilized quantum dots (QDs) into mesoscale aqueous spherical assemblies using microfluidics is described. In a flow-focusing configuration, self-assembly is initiated by the addition of water to a blended solution of polystyrene-coated QDs and amphiphilic polystyrene-block-poly(acrylic acid) stabilizing chains and terminated in a downstream quench step. The on-chip evolution of assemblies is monitored through fluorescence microscopy, and particle size distributions are determined off-chip by transmission electron microscopy. On-chip size control of the assemblies is demonstrated via both the average water concentration in the channel and the flow rate. |
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