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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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Colloids and Suspensions01:17

Colloids and Suspensions

3.9K
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...
3.9K
Colloidal precipitates01:09

Colloidal precipitates

6.9K
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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Coagulation01:06

Coagulation

1.7K
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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Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

3.9K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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The Colloidal State01:29

The Colloidal State

153
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...
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Video Experimental Relacionado

Updated: Apr 8, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Ciencia de los coloides: burbujas no esféricas.

Anand Bala Subramaniam1, Manouk Abkarian, L Mahadevan

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|December 16, 2005
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores descubrieron que las burbujas blindadas con partículas pueden mantener formas estables y no esféricas. El atascamiento de partículas durante la fusión evita que la tensión superficial obligue una forma esférica, lo que permite nuevas geometrías de burbujas.

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Área de la Ciencia:

  • Dinámica de fluidos La dinámica de fluidos.
  • Ciencia de los materiales ciencia de los materiales.
  • La ciencia coloidea es la ciencia de los coloides.

Sus antecedentes:

  • La tensión superficial naturalmente hace que las gotas de líquido y las burbujas de gas adopten formas esféricas para minimizar el área de la superficie.
  • Lograr formas no esféricas estables para burbujas y gotas ha sido un desafío de larga data en la mecánica de fluidos.

Objetivo del estudio:

  • Investigar la posibilidad de estabilizar formas no esféricas en burbujas de gas y gotas de líquido.
  • Explorar el papel de las monocapas de partículas en la alteración de las propiedades interfaciales de las burbujas y gotas.

Principales métodos:

  • Creando burbujas de gas y gotas de líquido recubiertas con una monocapa de partículas compactas.
  • Observando las formas de burbujas blindadas individuales y fusionadas.
  • Analizando las propiedades mecánicas de la monocapa de partículas durante la deformación de la interfaz.

Principales resultados:

  • Demostró que las burbujas y gotas blindadas con partículas pueden existir en configuraciones estables y no esféricas.
  • Se demostró que el atascamiento de partículas en la interfaz proporciona el soporte de tensión necesario para superar la minimización de la tensión superficial.
  • Se observó que las burbujas blindadas fusionadas pueden mantener formas asimétricas debido al atascamiento de partículas.

Conclusiones:

  • La armadura de partículas proporciona un nuevo mecanismo para estabilizar las burbujas y gotas no esféricas.
  • Este hallazgo desafía la comprensión convencional de la determinación de la forma para las interfaces de fluidos.
  • El atascamiento de partículas ofrece una vía para controlar e ingeniar complejas geometrías interfaciales.