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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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
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Spherulite-Like Micelles.

Shaofei Song1, Hang Zhou1, Shuyang Ye1

  • 1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.

Angewandte Chemie (International Ed. in English)
|February 24, 2021
PubMed
Summary

Researchers created novel 3D spherulite-like structures using block copolymer (BCP) self-assembly. These unique colloidal structures offer a new model for studying hierarchical self-assembly and spherulitic growth dynamics.

Keywords:
block copolymercontrollable growthcrystallization-driven self-assemblymicellesspherulites

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Crystallization-driven self-assembly of block copolymers (BCPs) typically yields 1D and 2D structures.
  • Formation of 3D hierarchical structures via secondary self-assembly in BCPs is exceptionally rare.
  • Understanding the formation of complex 3D architectures is crucial for advanced material design.

Purpose of the Study:

  • To investigate the formation of 3D structures through seeded growth of a specific BCP.
  • To characterize the morphology and growth behavior of these novel 3D self-assembled objects.
  • To establish a model system for studying spherulitic growth dynamics.

Main Methods:

  • Seeded growth experiments using a poly(ferrocenyldimethylsilane) BCP in decane.
  • Characterization of the self-assembled structures using microscopy and scattering techniques.
  • Controlled variation of unimer concentration to influence growth stages.

Main Results:

  • Successfully synthesized 3D spherulite-like colloidal structures with lenticular platelet precursors.
  • Observed unique morphology: spherical exterior with an asymmetric, sheaf-like core structure.
  • Demonstrated control over the growth stages by adjusting the amount of added unimer.

Conclusions:

  • The BCP system provides a rare example of 3D hierarchical self-assembly.
  • The synthesized structures serve as a valuable model for studying spherulitic growth.
  • This work opens new avenues for designing complex 3D nanomaterials through controlled self-assembly.