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Videos de Conceptos Relacionados

Colloidal precipitates01:09

Colloidal precipitates

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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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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

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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Coagulation01:06

Coagulation

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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Agrupaciones coloidales irregulares con simetría rota

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
Resumen
Este resumen es generado por máquina.

Los investigadores crearon nuevos grupos coloidales utilizando partículas de poliestireno y núcleos líquidos. La evaporación del disolvente solidifica los núcleos, formando estructuras estables, sintonizables o híbridas, purificadas por centrifugación.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química de los coloides y las superficies
  • Nanotecnología

Sus antecedentes:

  • Los grupos coloidales ofrecen propiedades sintonizables para materiales avanzados.
  • El ensamblaje controlado de nanopartículas sigue siendo un desafío significativo.
  • El desarrollo de métodos para crear estructuras coloidales complejas es crucial.

Objetivo del estudio:

  • Desarrollar un método para la preparación de grupos coloidales sintonizables.
  • Para investigar la formación de grupos coloidales irregulares e híbridos.
  • Para lograr estructuras de racimo coloidal de alta pureza.

Principales métodos:

  • Montaje de partículas de poliestireno (PS) cargadas positivamente en núcleos de polímero líquido cargados negativamente.
  • Evaporación de disolventes para solidificar núcleos líquidos y partículas de cemento.
  • Centrifugado por gradiente de densidad para la purificación de racimos coloidales.
  • Utilizando partículas de núcleo de sílice-PS para crear estructuras híbridas.

Principales resultados:

  • Clusters coloidales preparados con éxito con configuraciones ajustables.
  • Formación de racimos coloidales irregulares mediante la exposición de núcleos internos.
  • Creación de grupos coloidales híbridos con nanopartículas de sílice en las interfaces.
  • Se ha demostrado la purificación de alta pureza de racimos simétricos e híbridos mediante centrifugación.

Conclusiones:

  • El método descrito permite la síntesis controlada de racimos coloidales.
  • Los grupos coloidales parches y híbridos exhiben arquitecturas únicas y sintonizables.
  • La centrifugación por gradiente de densidad es eficaz para purificar estos conjuntos coloidales complejos.