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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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Colloids and Suspensions01:17

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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

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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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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Photoswitchable Dissipative Two-Dimensional Colloidal Crystals.

Jacopo Vialetto1, Manos Anyfantakis1,2, Sergii Rudiuk1

  • 1PASTEUR, Department of Chemistry, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France.

Angewandte Chemie (International Ed. in English)
|May 2, 2019
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate reversible photocontrol of 2D colloidal crystallization at the air/water interface. Microparticle assemblies switch between crystalline and disordered states using light-sensitive surfactants and external light stimuli.

Keywords:
dissipative systemsinterfacesphotocontrolself-assemblytwo-dimensional crystals

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Area of Science:

  • Colloid and Interface Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Controlling particle organization at fluid interfaces is crucial for fundamental research and material applications.
  • Developing stimulus-responsive systems is key for dynamic phenomena and reconfigurable materials.

Purpose of the Study:

  • To achieve reversible photocontrol of two-dimensional (2D) colloidal crystallization at the air/water interface.
  • To investigate dynamic phenomena and realize reconfigurable materials using light-actuated particle assemblies.

Main Methods:

  • Utilizing millimeter-sized assemblies of microparticles at the air/water interface.
  • Employing a photosensitive surfactant to dynamically control particle adsorption/desorption.
  • Applying light stimuli to actuate particle organization.

Main Results:

  • Demonstrated the first reversible photocontrol of 2D colloidal crystallization.
  • Achieved dynamic switching between highly crystalline (under light) and disordered (in dark) phases.
  • Observed fast response times for crystallization (≈10 s) and disassembly (≈1 min).

Conclusions:

  • Established a novel dissipative system where crystalline states are maintained with energy input.
  • Showcased a new method for creating reconfigurable materials through light-actuated colloidal assemblies.
  • Opened avenues for fundamental studies on dynamic phenomena at fluid interfaces.