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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles.

Cangyi Chen1, Tiancai Zhang1, Lei Zhu2

  • 1The State Key Laboratory of Molecular Engineering of Polymers, Key Laboratory of Computational Physical Sciences, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.

ACS Macro Letters
|May 26, 2022
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Summary
This summary is machine-generated.

Binary mixed homopolymer-grafted nanoparticles self-assemble into programmed superstructures. Self-consistent field theory reveals control over nanoparticle lattice arrangements, forming simple cubic and body-centered cubic structures.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Hierarchical superstructures offer tunable properties for advanced materials.
  • Controlling nanoparticle assembly is crucial for designing functional nanomaterials.
  • Homopolymer-grafted nanoparticles present a versatile platform for directed self-assembly.

Purpose of the Study:

  • To investigate the self-assembly behavior of binary mixed homopolymer-grafted nanoparticles.
  • To explore the influence of polymer brush characteristics on superstructure formation.
  • To identify design strategies for novel hierarchical nanomaterials.

Main Methods:

  • Utilizing self-consistent field theory (SCFT) simulations.
  • Analyzing nanoparticle core/polymer size ratios and grafting densities.
  • Employing two-dimensional (2D) model calculations.

Main Results:

  • Achieved programmed spatial lattice arrangements of nanoparticles.
  • Observed non-close-packed simple cubic (SC) lattices at small size ratios (R/ξ < 1).
  • Identified transformation to body-centered cubic (BCC) lattices at larger size ratios (R/ξ > 1).
  • Discovered unconventional microphases like tetragonal cylinders and simple cubic spheres.
  • Demonstrated that nanoparticles arrange to minimize free energy, favoring isolated particle morphology.

Conclusions:

  • Grafting mixed homopolymer brushes effectively programs nanoparticle lattice arrangements.
  • Specific parameters enable the formation of diverse crystal structures and microphases.
  • Findings provide a strategy for designing hierarchical nanomaterials with hybrid inorganic/organic superstructures.