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Related Concept Videos

Colloids03:22

Colloids

19.6K
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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Colloids and Suspensions01:17

Colloids and Suspensions

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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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Colloidal precipitates01:09

Colloidal precipitates

2.8K
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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Forming, Confining, and Observing Microtubule-Based Active Nematics
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Elastomeric nematic colloids, colloidal crystals and microstructures with complex topology.

Ye Yuan1, Patrick Keller, Ivan I Smalyukh

  • 1Department of Physics, University of Colorado, Boulder, CO 80309, USA. ivan.smalyukh@colorado.edu.

Soft Matter
|January 25, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed novel ring-shaped colloidal particles that change shape and topology when heated. This breakthrough enables new ways to control soft matter systems and create responsive materials for advanced applications.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Colloidal Science

Background:

  • Controlling physical behaviors of nematic colloids and colloidal crystals is typically achieved through particle shape, topology, chirality, and surface charging.
  • Altering soft matter system behaviors by changing particle shape and their responses to external stimuli remains a challenge.

Purpose of the Study:

  • To fabricate genus-one nematic elastomeric colloidal ring-shaped particles and microstructures.
  • To investigate the anisotropic responses and actuation of these particles when heated.
  • To explore the potential for controlling colloidal surface topology and lattice symmetry.

Main Methods:

  • Fabrication of genus-one nematic elastomeric colloidal ring-shaped particles and microstructures using two-photon photopolymerization.
  • Inducing nematic ordering within particles and the surrounding medium.
  • Utilizing thermal control to induce topological changes (genus-one to genus-zero).
  • Investigating elastomeric colloidal crystals immersed in liquid crystal fluid.

Main Results:

  • Nematic ordering led to anisotropic responses and actuation upon heating.
  • Elastomeric microstructures demonstrated a change in surface topology from genus-one to genus-zero with thermal control.
  • Elastomeric colloidal crystals exhibited crystallographic symmetry transformations when immersed in liquid crystal fluid.

Conclusions:

  • The study demonstrates a novel method for controlling soft matter systems by altering particle shape and inducing topological changes.
  • These findings open possibilities for creating colloidal crystals responsive to various external stimuli like heat, electric fields, and light.
  • The pre-designed responses of these elastomeric nematic colloids are significant for both fundamental research and practical applications.