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Related Concept Videos

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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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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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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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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Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Phoretic motion of colloids in a phase separating medium.

Rajeev Dattani1, Enrico F Semeraro, Theyencheri Narayanan

  • 1ESRF - The European Synchrotron, 38043 Grenoble, France. narayan@esrf.fr.

Soft Matter
|March 28, 2017
PubMed
Summary
This summary is machine-generated.

Diffusiophoresis, the movement of particles due to concentration gradients, was studied in phase-separating liquids. Colloids moved towards a specific phase during separation, with motion ceasing upon completion.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Chemical Engineering

Background:

  • Diffusiophoresis describes particle motion driven by concentration gradients.
  • Understanding colloidal dynamics in complex fluids is crucial for material science.

Purpose of the Study:

  • To investigate the dynamics of colloidal particles in a phase-separating binary mixture.
  • To characterize the phoretic motion of silica colloids during liquid-liquid demixing.

Main Methods:

  • Utilized X-Ray Photon Correlation Spectroscopy (XPCS) in the ultra-small angle scattering range.
  • Employed charge-stabilized silica colloids in a 3-methylpyridine and water/heavy water mixture.
  • Monitored colloidal dynamics during phase separation over hundreds of seconds.

Main Results:

  • Silica colloids exhibited enhanced motion towards the 3-methylpyridine-rich phase upon demixing.
  • This directed phoretic motion persisted until phase separation was complete.
  • Colloidal dynamics reverted to normal diffusion after phase separation.

Conclusions:

  • The study demonstrates diffusiophoresis as a key mechanism governing colloid behavior in phase-separating systems.
  • XPCS is effective in probing ultrafast colloidal dynamics during phase transitions.
  • Colloid-phase interactions dictate their transport phenomena during demixing.