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Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids03:22

Colloids

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...
The Colloidal State01:29

The Colloidal State

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 the...
Colloids and Suspensions01:17

Colloids and Suspensions

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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Video Experimental Relacionado

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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
09:55

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Published on: June 23, 2017

Janus palillos coloidales de cerillas coloidales de Janus

Kundan Chaudhary1, Qian Chen, Jaime J Juárez

  • 1Department of Materials Science and Engineering and the Frederick Seitz Materials Research Laboratory, ‡Department of Physics, and §Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|August 1, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Se fabricaron barras de sílice químicamente anisotrópicas con puntas de oro, llamadas cerillas Janus. Estas partículas se ensamblan espontáneamente en complejas estructuras multipod en solución.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Ciencia de la coloide Ciencia de las coloides.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los coloides químicos y de forma anisotrópica son cruciales para los materiales avanzados.
  • Controlar el autoensamblaje de las partículas anisotrópicas es un reto.

Objetivo del estudio:

  • Para fabricar y caracterizar nuevos coloides de cerillas de Janus.
  • Para investigar el comportamiento de autoensamblaje de estas partículas anisotrópicas.

Principales métodos:

  • Fabricación en múltiples etapas que incluye alineación del campo eléctrico, cristalización, impresión por microcontacto y metalización selectiva.
  • Observación directa del autoensamblaje en una solución acuosa.

Principales resultados:

  • Fabricación exitosa de coloides de fósforos Janus de sílice y oro.
  • Observación del autoensamblaje en estructuras multipodas (bi-, tri- y tetrápodas).
  • Variabilidad en el número de coordinación y el ángulo de parche de las estructuras ensambladas.

Conclusiones:

  • Los fósforos Janus son un versátil bloque de construcción para ensamblajes coloidales complejos.
  • El proceso de autoensamblaje ofrece control sobre la formación de la estructura.