Controlled self-assembly of quantum dots and block copolymers in a microfluidic device.
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.
Schabas
Greg
G
Department of Mechanical Engineering, University of Victoria, P.O. Box 3055, Stn. CSC, Victoria, British Columbia, Canada V8W 3P6.
Yusuf
Huda
H
Moffitt
Matthew G
MG
Sinton
David
D