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Related Concept Videos

Colloids03:22

Colloids

17.1K
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...
17.1K
The Colloidal State01:29

The Colloidal State

182
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...
182
Colloids and Suspensions01:17

Colloids and Suspensions

3.4K
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...
3.4K
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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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Magnetically responsive gourd-shaped colloidal particles in cholesteric liquid crystals.

Bohdan Senyuk1, Michael C M Varney, Javier A Lopez

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

Soft Matter
|July 5, 2014
PubMed
Summary

Gourd-shaped particles in liquid crystals exhibit unique multi-level sedimentation and tunable interactions. This research enables novel colloidal assembly using magnetic fields and laser tweezers.

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Area of Science:

  • Colloid science
  • Soft matter physics
  • Liquid crystal physics

Background:

  • Particle shape and medium chirality influence colloidal self-assembly and dynamics.
  • Cholesteric liquid crystals (CLCs) offer unique environments for colloidal behavior.

Purpose of the Study:

  • Investigate the behavior of magnetically responsive gourd-shaped colloids in CLCs.
  • Characterize particle-wall interactions and sedimentation patterns.
  • Demonstrate controlled colloidal assembly using laser tweezers.

Main Methods:

  • Magnetic manipulation and optical tweezers to control and position colloids.
  • Measurement of elastic repulsive forces between particles and confining surfaces.
  • 3D laser tweezers for particle assembly.

Main Results:

  • Observed non-monotonic and oscillatory particle-wall interaction forces.
  • Gourd-shaped particles form multiple long-lived metastable sedimentation levels.
  • Demonstrated 3D assembly of particles leveraging CLC properties.

Conclusions:

  • Particle shape and CLC properties enable complex colloidal organization.
  • Metastable sedimentation levels and tunable interactions offer new control mechanisms.
  • Potential for novel orientationally and positionally ordered colloidal structures.