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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Dynamic Photonic Janus Colloids with Axially Stacked Structural Layers.

Juyoung Lee1, Soohyun Ban1, Kyuhyung Jo1

  • 1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

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|February 2, 2024
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Summary

Researchers developed novel photonic diblock copolymer (dBCP) particles with over 300 stacked layers. These particles exhibit dynamic shape and color changes, overcoming previous limitations in photonic applications.

Keywords:
Janus colloidsphase separationphotonic block copolymersresponsivestructural color

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Diblock copolymer (dBCP) particles offer dynamic shape and color changes for programmable nanostructures.
  • Existing dBCP particles face limitations in creating defect-free photonic layers for photonic systems.
  • Achieving multi-layered photonic structures at the tens-of-micrometers scale remains a challenge.

Purpose of the Study:

  • To demonstrate photonic dBCP particles with over 300 axially stacked photonic layers.
  • To achieve responsive color- and shape-transforming capabilities in these advanced photonic particles.
  • To explore applications in smart photonic inks and devices.

Main Methods:

  • Utilizing macrophase and microphase separation of incompatible components in solvent-evaporative microemulsions.
  • Leveraging continuous phase separation of silicone oil from polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) via solvent evaporation.
  • Controlling particle morphology and structural color by adjusting PS-b-P2VP molecular weight and component volume ratios.

Main Results:

  • Formation of Janus colloids with nanostructured polymer cones and aligned lamellar structures.
  • Demonstration of over 300 defect-free photonic layers in dBCP particles.
  • Precise tuning of particle morphology, orientation, dispersion, and structural color.
  • Visualization of reversible swelling/deswelling correlated with structural color changes.
  • Creation of multicolor-patterned arrays of photonic colloids.

Conclusions:

  • Pioneering development of multi-layered photonic dBCP particles with dynamic properties.
  • Overcoming scale limitations for defect-free photonic layers in dBCP materials.
  • Highlighting potential for advanced photonic inks and responsive photonic devices.