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A Droplet-Based Microfluidics Route to Temperature-Responsive Colloidal Molecules.

Feifei Peng1, Linda K Månsson1, Stefan H Holm1

  • 1NanoLund , SE-22100 Lund , Sweden.

The Journal of Physical Chemistry. B
|October 5, 2019
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Summary
This summary is machine-generated.

Researchers created temperature-responsive colloidal molecules using microfluidics. These building blocks offer tunable interactions for novel material assembly, mimicking natural biomacromolecules.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Colloid Chemistry

Background:

  • Colloidal molecules are promising building blocks for bottom-up material fabrication.
  • Controlling interparticle interactions in colloidal systems is crucial for ordered assembly.
  • Existing colloidal molecules often exhibit hard-sphere behavior, limiting assembly control.

Purpose of the Study:

  • To develop temperature-responsive colloidal molecules with externally controllable interactions.
  • To utilize microgel particles undergoing a volume phase transition temperature (VPTT).
  • To mimic the interactions of patchy biomacromolecules using synthetic colloidal systems.

Main Methods:

  • Employed droplet-based microfluidics to create uniform emulsion droplets containing microgels.
  • Used poly(N-isopropylacrylamide) (PNIPAM) and poly(N-isopropylmethacrylamide) (PNIPMAM) microgels.
  • Harvested colloidal molecules via cross-linking and phase transfer after water evaporation.

Main Results:

  • Successfully prepared bicomponent colloidal molecules from two types of microgels.
  • Demonstrated tunable, short-range attractive interactions by exploiting differences in VPTTs.
  • Achieved interactions analogous to those in patchy biomacromolecules at specific temperatures.

Conclusions:

  • Temperature-responsive microgel-based colloidal molecules offer precise control over interparticle forces.
  • This approach enables the design of novel materials through bottom-up assembly.
  • The method provides a platform for mimicking complex biological interactions in synthetic systems.