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Controlled self-assembly of quantum dot-block copolymer colloids in multiphase microfluidic reactors.

Chih-Wei Wang1, Ali Oskooei, David Sinton

  • 1Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3 V6.

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Controlled self-assembly of quantum dot micelles (QDCMs) in microfluidic reactors is achieved. QDCM size is tunable (40-140 nm) by balancing particle growth and breakup mechanisms.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Quantum dots (QDs) are semiconductor nanoparticles with unique optical and electronic properties.
  • Self-assembly is a crucial bottom-up approach for creating complex nanostructures.
  • Microfluidic reactors offer precise control over reaction conditions and particle formation.

Purpose of the Study:

  • To demonstrate the controlled self-assembly of large compound quantum dot micelles (QDCMs).
  • To investigate the mechanisms governing QDCM size and polydispersity in microfluidic systems.
  • To explore the tunability of QDCM size by manipulating chemical and flow parameters.

Main Methods:

  • Utilized gas-liquid segmented microfluidic reactors for QDCM synthesis.
  • Initiated self-assembly via chaotic advection for rapid mixing of polymer and QD constituents.
  • Analyzed QDCMs using transmission electron microscopy (TEM) after off-chip quenching.

Main Results:

  • Achieved controlled self-assembly of QDCMs with tunable sizes ranging from 40-140 nm.
  • Identified particle growth via collision-induced coalescence and particle breakup via shear as key competing mechanisms.
  • Demonstrated a minimum QDCM size of ~41 nm at high flow rates due to shear-induced breakup.

Conclusions:

  • Microfluidic reactors enable precise control over QDCM formation and size.
  • The interplay between coalescence and breakup mechanisms dictates the final QDCM size distribution.
  • Tunable synthesis of QDCMs is achievable by adjusting flow rates, water concentration, and gas-to-liquid ratios.