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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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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The Colloidal State01:29

The Colloidal State

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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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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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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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Centrifugation01:05

Centrifugation

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Diffusiophoretic Focusing of Suspended Colloids.

Nan Shi1, Rodrigo Nery-Azevedo1, Amr I Abdel-Fattah2

  • 1Chemical Engineering department, University of California, Santa Barbara.

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Colloids can focus in steady gradients, but simple models are invalid due to coupled transport. Focusing requires specific particle surface properties or chemical reactions between electrolytes.

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Microfluidics

Background:

  • Diffusiophoresis is a key phenomenon for manipulating colloidal particles using electrolyte gradients.
  • Steady-state gradients are crucial for controlled particle focusing in microfluidic devices.
  • Existing theories often simplify multicomponent electrolyte interactions, potentially limiting predictive accuracy.

Purpose of the Study:

  • To investigate the focusing behavior of colloids in controlled, steady-state multicomponent pH and electrolyte gradients.
  • To re-evaluate classical diffusiophoretic theories in the context of coupled transport phenomena.
  • To identify the necessary conditions for achieving stable colloidal focusing in complex gradient environments.

Main Methods:

  • Utilized a microfluidic system to generate and maintain precise, steady-state multicomponent pH and electrolyte gradients.
  • Observed and analyzed the diffusiophoretic migration and focusing of suspended colloidal particles.
  • Developed a theoretical framework based on species flux rather than local gradients to model transport.

Main Results:

  • Colloidal particles can indeed focus at specific positions within steady-state gradients.
  • Superposition of individual gradient effects is invalid due to coupled electrolyte transport.
  • Stringent conditions, including particle surface property variations or in-situ chemical reactions, are necessary for focusing.

Conclusions:

  • Diffusiophoretic focusing in steady gradients is more complex than previously assumed.
  • Accurate prediction and design require considering coupled transport and specific particle-electrolyte interactions.
  • The findings offer a new conceptual framework for diffusiophoresis in multicomponent systems.