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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

1.6K
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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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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Colloids03:22

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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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Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Patchy Colloidal Clusters with Broken Symmetry.

You-Jin Kim1, Jae-Hyun Kim1, In-Seong Jo1

  • 1School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi 16419, Republic of Korea.

Journal of the American Chemical Society
|August 16, 2021
PubMed
Summary
This summary is machine-generated.

Researchers created novel colloidal clusters using polystyrene particles and liquid cores. Solvent evaporation solidifies the cores, forming stable, tunable patchy or hybrid structures, purified by centrifugation.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Nanotechnology

Background:

  • Colloidal clusters offer tunable properties for advanced materials.
  • Controlled assembly of nanoparticles remains a significant challenge.
  • Developing methods for creating complex colloidal structures is crucial.

Purpose of the Study:

  • To develop a method for preparing tunable colloidal clusters.
  • To investigate the formation of patchy and hybrid colloidal clusters.
  • To achieve high-purity colloidal cluster structures.

Main Methods:

  • Assembly of positively charged polystyrene (PS) particles onto negatively charged liquid polymer cores.
  • Solvent evaporation to solidify liquid cores and cement particles.
  • Density gradient centrifugation for purification of colloidal clusters.
  • Utilizing silica-PS core-shell particles to create hybrid structures.

Main Results:

  • Successfully prepared colloidal clusters with tunable configurations.
  • Formation of patchy colloidal clusters by exposing inner cores.
  • Creation of hybrid colloidal clusters with silica nanoparticles at interfaces.
  • Demonstrated high-purity purification of symmetric and hybrid clusters via centrifugation.

Conclusions:

  • The described method allows for controlled synthesis of colloidal clusters.
  • Patchy and hybrid colloidal clusters exhibit unique, tunable architectures.
  • Density gradient centrifugation is effective for purifying these complex colloidal assemblies.