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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Transformable Colloidal Polymer Particles with Ordered Internal Structures.

Renhua Deng1, Lingfei Zheng2, Xi Mao1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education (HUST), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 29, 2020
PubMed
Summary
This summary is machine-generated.

Researchers created shape-shifting colloidal particles using polymer self-assembly. Controlling solvent conditions allows tunable particle morphology for advanced applications.

Keywords:
3D soft confinementblock copolymerscolloidal particlesmorphological transformationsolvent annealing

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Colloid Science

Background:

  • Colloidal particles with tunable morphology are crucial for advanced materials.
  • Controlling self-assembly of block copolymers is key to particle design.

Purpose of the Study:

  • To present internally ordered colloidal particles capable of morphological transformations.
  • To investigate the influence of solvent selectivity and annealing on particle morphology.
  • To demonstrate the potential for designing stimuli-responsive colloidal particles.

Main Methods:

  • Emulsion solvent evaporation-induced 3D soft confined assembly of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) di-block copolymers.
  • Systematic variation of solvent selectivity, annealing time, and interfacial interactions.
  • Experimental studies combined with computational simulations for analysis.

Main Results:

  • Achieved control over particle shape (pupa-like, patchy) and internal structure (lamellar, plum pudding).
  • Demonstrated order-order morphological transformation via 3D soft confined annealing.
  • Correlated experimental observations with simulation results.

Conclusions:

  • Solvent selectivity and annealing are effective control parameters for colloidal particle morphology.
  • These tunable colloidal particles hold promise for applications in photonic crystals, drug delivery, sensors, and smart coatings.