Flow-directed block copolymer micelle morphologies via microfluidic self-assembly |
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Authors: | Wang Chih-Wei Sinton David Moffitt Matthew G |
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Institution: | Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6. |
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Abstract: | The self-assembly of amphiphilic block copolymers in a gas-liquid microfluidic reactor produces variable, flow-directed micellar morphologies entirely different from off-chip equilibrium structures. A polystyrene-block-poly(acrylic acid) copolymer, which forms exclusively spheres off-chip, generates kinetic cylinders, Y-junctions, bilayers, and networks by a mechanism of collision-coalescence enabled by strong and localized on-chip shear fields. Variation in the size and relative amount of flow-directed nanostructures is achieved by changing the water content and flow rate. These results demonstrate on-chip processing routes to specific functional colloidal nanostructures. |
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