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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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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
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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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Dimple Colloids with Tunable Cavity Size and Surface Functionalities.

Yong Guo1, Bas G P van Ravensteijn1, Willem K Kegel1

  • 1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Research Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

Macromolecules
|June 25, 2019
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Summary
This summary is machine-generated.

Researchers created dimple colloids using a novel dispersion polymerization technique. Delayed cross-linker addition induces particle contraction, causing shell buckling and forming well-defined dimples for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Colloidal particles are fundamental building blocks in materials science.
  • Creating particles with complex morphologies, such as cavities, is challenging.
  • Controlled synthesis of anisotropic particles is crucial for advanced self-assembly.

Purpose of the Study:

  • To develop a novel method for synthesizing dimple colloids with well-defined cavities.
  • To investigate the mechanism of dimple formation in polymer colloids.
  • To demonstrate the utility of dimple colloids in creating anisotropic particles and ordered assemblies.

Main Methods:

  • Modified dispersion polymerization with delayed cross-linker addition.
  • Systematic variation of delayed addition time and cross-linker concentration.
  • Morphological characterization using selective etching (e.g., with dimethylformamide).
  • Incorporation of functional monomers for chemical modification.

Main Results:

  • Achieved synthesis of dimple colloids with a distinct core-shell morphology.
  • Identified particle volume contraction due to monomer consumption as the driving force for dimple formation.
  • Demonstrated the creation of chemically modifiable dimple particles.
  • Fabricated dumbbell-shaped colloids with hollow and solid lobes from dimple particles.
  • Observed self-assembly of anisotropic particles into strings in an alternating current electric field.

Conclusions:

  • Delayed cross-linker addition is key to forming dimple colloids via core-shell morphology and subsequent shell buckling.
  • The developed method allows for the synthesis of functional dimple particles and anisotropic colloids.
  • These anisotropic particles exhibit controlled self-assembly behavior, opening avenues for structured materials.