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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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Precipitate Formation and Particle Size Control01:16

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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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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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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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Settled and unsettled issues in particle settling.

Roberto Piazza1

  • 1Department of Chemistry, Material Science, and Chemical Engineering Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy.

Reports on Progress in Physics. Physical Society (Great Britain)
|May 8, 2014
PubMed
Summary
This summary is machine-generated.

Colloid sedimentation experiments, particularly those by Perrin, demonstrated molecular reality and supported Einstein's Brownian motion theory. Further study of sedimentation equilibrium and dynamics reveals complex physics across diverse systems.

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Area of Science:

  • Statistical Physics
  • Fluid Mechanics
  • Colloid Science

Background:

  • Perrin's experiments provided key evidence for molecular reality and Brownian motion.
  • Colloid sedimentation is fundamental to statistical physics and fluid dynamics.

Purpose of the Study:

  • To review colloid sedimentation, focusing on low Peclet number regimes.
  • To highlight the insights gained from sedimentation equilibrium and dynamics in various systems.
  • To discuss emerging challenges and research opportunities in sedimentation science.

Main Methods:

  • Focus on low Peclet number sedimentation where Brownian fluctuations dominate.
  • Analysis of sedimentation equilibrium and particle settling dynamics.
  • Review of diverse systems: simple colloids, mesogenic suspensions, soft solids, active particles, and living organisms.

Main Results:

  • Sedimentation provides a rich platform for understanding molecular reality and Brownian motion.
  • Diverse systems exhibit complex behaviors and unexpected phenomena during sedimentation.
  • Low Peclet number sedimentation reveals dominant Brownian effects.

Conclusions:

  • Colloid sedimentation continues to be a vital area for advancing statistical and fluid mechanics.
  • Unexpected effects in sedimentation pose challenging questions for theoretical frameworks.
  • Sedimentation research offers exciting opportunities across various scientific disciplines.