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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...
Colloids and Suspensions01:17

Colloids and Suspensions

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

Colloids

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...
Colloidal precipitates01:09

Colloidal precipitates

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...
Coagulation01:06

Coagulation

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...
Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Colloidal dynamics near a particle-covered surface.

H B Eral1, F Mugele, M H G Duits

  • 1Physics of Complex Fluids group, Faculty of Science and Technology, IMPACT Institute, University of Twente, 7500 AE Enschede, The Netherlands. h.b.eral@utwente.nl

Langmuir : the ACS Journal of Surfaces and Colloids
|August 11, 2011
PubMed
Summary
This summary is machine-generated.

Particle-coated surfaces significantly alter colloidal sphere dynamics, transitioning motion from diffusive to caged at lower concentrations. This effect is distinct from simple volume fraction changes.

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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Understanding colloidal dynamics near surfaces is crucial for industrial processes like fouling and sedimentation.
  • Confinement effects on particle motion are fundamental to colloid science.

Purpose of the Study:

  • To investigate how colloidal sphere dynamics are affected by proximity to a particle-coated surface.
  • To differentiate the impact of surface-attached particles from bulk effective volume fraction (EVF).

Main Methods:

  • Utilized video microscopy to observe colloidal sphere movement.
  • Measured particle mean squared displacement (MSD) functions.
  • Varied local effective volume fraction (EVF) using gravity settling.

Main Results:

  • At low to moderate EVF (0.2-0.4), motion amplitudes at the coated surface were significantly reduced.
  • A sharp transition from diffusive to caged motion was observed at the coated surface.
  • Surface-attached particles demonstrably impede motion beyond simple volume fraction effects.

Conclusions:

  • Immobile surface particles have a distinct and significant impact on colloidal dynamics, not accounted for by EVF alone.
  • At higher EVF (>0.45), bulk particle interactions dominate, making dynamics similar at bare and coated surfaces.