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Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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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...
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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Nuevas interacciones coloidales en fluidos anisotrópicos.

Poulin1, Stark, Lubensky

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)
|March 21, 1997
PubMed
Resumen
Este resumen es generado por máquina.

Las interacciones coloidales entre gotas de agua en cristales líquidos crean estructuras únicas en forma de cadena. Estas interacciones ofrecen nuevas posibilidades para estabilizar los sistemas coloidales.

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Área de la Ciencia:

  • Ciencia de los coloides y de las interfaces científicas.
  • Física de la materia blanda Física de la materia blanda
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los fluidos anisotrópicos como los cristales líquidos nemáticos exhiben propiedades únicas.
  • Las partículas coloidales dispersas en dichos fluidos experimentan nuevas interacciones.
  • Comprender estas interacciones es clave para controlar el ensamblaje de partículas.

Objetivo del estudio:

  • Para investigar las interacciones coloidales de pequeñas gotas de agua en un huésped de cristal líquido nemático.
  • Para dilucidar el origen de estas interacciones basadas en la energía elástica del fluido huésped.
  • Explorar las posibles aplicaciones en la estabilización de coloides.

Principales métodos:

  • Análisis teórico de la energía elástica en fluidos anisotrópicos.
  • Modelado de las fuerzas entre gotas.
  • Observación del autoensamblaje coloidal.

Principales resultados:

  • Se identificó repulsión de corto alcance y atracción dipolar de largo alcance entre las gotas de agua.
  • Se observó la formación de estructuras anisotrópicas en forma de cadena.
  • Se demostró que las interacciones repulsivas pueden ser aprovechadas para la estabilización de coloides.

Conclusiones:

  • Las interacciones de las gotas de agua en los cristales líquidos nemáticos se rigen por la energía elástica de orientación.
  • Estas interacciones conducen a estructuras coloidales anisotrópicas únicas.
  • Las fuerzas repulsivas descubiertas presentan nuevas estrategias para la estabilización coloidal.