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Related Concept Videos

Colloids03:22

Colloids

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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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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals08:54

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A two dimensional model material of discotic zirconium phosphate was developed. The inorganic crystal with lamellar structure was synthesized by hydrothermal, reflux, and microwave-assisted methods. On exfoliation with organic molecules, layered crystals can be converted to monolayers, and nematic liquid crystal phase was formed at sufficient concentration of monolayers.
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Synthesis and Characterization of Supramolecular Colloids09:26

Synthesis and Characterization of Supramolecular Colloids

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A protocol for the synthesis and characterization of colloids coated with supramolecular moieties is described. These supramolecular colloids undergo self-assembly upon the activation of the hydrogen-bonds between the surface-anchored molecules by...
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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

5.7K
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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Endoscopic Approach for Colloid Cyst Resection

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This protocol details a minimally invasive endoscopic technique for the removal of third ventricular colloid cysts. It provides a comprehensive overview of preoperative preparations, surgical steps, and postoperative outcomes, emphasizing reduced recovery time, minimal complications, and total cyst removal. This approach is a safe and effective alternative to traditional...
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Colloids, Micelles; Tyndall Effect
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Colloids, Micelles; Tyndall Effect

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Artificial colloidal liquid metacrystals by shearing microlithography.

Yanqiu Jiang1, Fan Guo1, Zhen Xu2

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, 310027, Hangzhou, P. R. China.

Nature Communications
|September 13, 2019
PubMed
Summary

Researchers developed stable liquid metacrystals with meta-periodicity using shearing microlithography. This breakthrough enables digital design of liquid crystalline materials with diverse symmetries and functionalities.

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Area of Science:

  • Materials Science
  • Soft Matter Physics

Background:

  • Meta-periodicity, beyond atomic order, is known in solids but unstable in lyotropic liquid crystals.
  • Achieving stable meta-periodicity in liquid crystals without external stimuli is a significant challenge.

Purpose of the Study:

  • To create stable, free-standing lyotropic liquid crystals exhibiting meta-periodicity.
  • To explore methods for achieving and controlling meta-periodicity in colloidal liquid crystal systems.

Main Methods:

  • Invented shearing microlithography technique for fabricating liquid metacrystals.
  • Utilized giant molecular size and excluded volume repulsion for dynamic stabilization of meta-periodicity.

Main Results:

  • Successfully created liquid metacrystals with stable meta-periodicity in a free state.
  • Demonstrated control over a wide range of symmetries, including Bravais and quasicrystalline lattices.
  • Liquid metacrystals dynamically stabilized by molecular size and repulsion.

Conclusions:

  • Liquid metacrystals represent an extended form of liquid crystals with tunable meta-periodicity.
  • Shearing microlithography is a facile technology for fabricating liquid meta-structures and metamaterials.
  • Enables digital design of structures and functionalities in liquid crystalline materials.