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Visualizing Interfacial Jamming Using an Aggregation-Induced-Emission Molecular Reporter.

Pei-Yang Gu1,2, Feng Zhou1, Ganhua Xie2

  • 1College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China.

Angewandte Chemie (International Ed. in English)
|January 25, 2021
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Summary
This summary is machine-generated.

We developed a new method using fluorescence imaging to detect nanoparticle (NP) jamming at interfaces. This technique distinguishes jamming from vitrification by observing changes in NP assembly dynamics.

Keywords:
3D printingaggregation-induced emissioninterfacesinterfacial jammingstructured liquids

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Area of Science:

  • Colloid and Interface Science
  • Materials Science
  • Nanotechnology

Background:

  • Nanoparticle (NP) assemblies transition from liquid-like to solid-like states via interfacial jamming or vitrification.
  • Distinguishing between jamming and vitrification is challenging due to similar solid-like behaviors.
  • Interfacial jamming involves denser NP packing and forms a load-bearing network.

Purpose of the Study:

  • To develop a real-time fluorescence imaging method to probe interfacial NP dynamics.
  • To identify a reliable reporter for the transition of NP assemblies into the jammed state.
  • To differentiate interfacial jamming from vitrification in NP assemblies.

Main Methods:

  • Utilizing aggregation-induced emission (AIE) fluorophores as reporters for NP dynamics.
  • Employing real-time fluorescence imaging at the water/oil interface.
  • Monitoring changes in AIEgen fluorescence intensity and behavior with increasing NP density.

Main Results:

  • AIEgens exhibit distinct fluorescence behavior correlating with their mobility and aggregation state.
  • Aggregation of AIEgens due to increased NP density leads to restricted rotation and enhanced fluorescence.
  • This fluorescence enhancement serves as a direct indicator of NP interfacial jamming.

Conclusions:

  • Real-time fluorescence imaging with AIE reporters provides a sensitive method to detect NP interfacial jamming.
  • The method allows for the differentiation of jamming from vitrification based on observed dynamics.
  • This approach offers a new tool for understanding and controlling NP assembly at interfaces.