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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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 the...
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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...
Colloids03:22

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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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Colloids dragged through a polymer solution: Experiment, theory, and simulation.

Christof Gutsche1, Friedrich Kremer, Matthias Krüger

  • 1Institut für Experimentalphysik I, Universität Leipzig, 04103 Leipzig, Germany.

The Journal of Chemical Physics
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

Optical tweezers measured higher drag on colloids in DNA solutions than predicted. This is due to DNA accumulation and depletion around the colloid, confirmed by drift-diffusion models and simulations.

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Area of Science:

  • Polymer physics
  • Soft matter physics
  • Biophysics

Background:

  • Microrheology uses colloidal probes to study fluid properties.
  • Stokes' law describes drag force on objects in viscous fluids.
  • Lambda-DNA serves as a well-defined model polymer for solution studies.

Purpose of the Study:

  • To measure the drag force on colloids in lambda-DNA solutions using optical tweezers.
  • To investigate deviations from Stokes' law in polymer solutions.
  • To understand the role of polymer distribution in microrheological measurements.

Main Methods:

  • Microrheological measurements using optical tweezers.
  • Pulling colloids through lambda-DNA solutions.
  • Comparison with Stokes formula and independently measured viscosity.
  • Drift-diffusion modeling of DNA molecules.
  • Brownian dynamics simulations.

Main Results:

  • Observed drag force exceeded predictions from Stokes' law and solution viscosity.
  • Evidence of DNA accumulation ahead of the colloid and depletion behind it.
  • Drift-diffusion model and Brownian dynamics simulations corroborated the experimental findings.

Conclusions:

  • Polymer accumulation and depletion significantly influence microrheological drag forces.
  • Standard viscosity measurements may not fully capture complex fluid behavior in polymer solutions.
  • The study highlights the importance of considering polymer dynamics in microrheology.