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Related Concept Videos

The Colloidal State01:29

The Colloidal State

166
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Preparation of Carbon Nanosheets at Room Temperature
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Pathway toward large two-dimensional hexagonally patterned colloidal nanosheets in solution.

Bo Ni1, Mingjun Huang, Ziran Chen

  • 1Department of Polymer Science, The University of Akron , Akron, Ohio 44325-3909, United States.

Journal of the American Chemical Society
|January 16, 2015
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Summary
This summary is machine-generated.

We explored self-assembly of block terpolymers with fluorinated cages. Increasing water content led to novel structures like toroids, nanosheets, and vesicles, controlled by free energy.

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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Block copolymers self-assemble into diverse morphologies.
  • Polyhedral oligomeric silsesquioxanes (POSS) offer unique structural properties.
  • Tethering polymers to POSS cages creates novel hybrid materials.

Purpose of the Study:

  • To investigate the solution self-assembly of an ABC block terpolymer.
  • To explore the effect of fluorinated POSS cages on morphology formation.
  • To understand the role of water content in directing self-assembled structures.

Main Methods:

  • Solution self-assembly in 1,4-dioxane/water mixtures.
  • Utilizing an ABC block terpolymer with polystyrene-block-poly(ethylene oxide) and a fluorinated POSS cage.
  • Varying water content to induce morphological transitions.

Main Results:

  • Observed sequential formation of circular cylinders, nanosheets, and vesicles with increasing water content.
  • Identified toroid formation driven by competing end-cap and bending energies.
  • Demonstrated that FPOSS cages enhance toroid formation.
  • Showcased the formation of hexagonally patterned nanosheets and nanopatterned vesicles.

Conclusions:

  • The self-assembly is highly sensitive to water content and polymer architecture.
  • FPOSS cages play a crucial role in directing complex morphology formation.
  • This study provides insights into designing advanced nanostructured materials.