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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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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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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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Coagulation01:06

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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Phase behaviour of colloids plus weakly adhesive polymers.

R Tuinier1,2, S Ouhajji3,4, P Linse4

  • 1Laboratory of Physical Chemistry (SPC), Department of Chemical Engineering and Chemistry & Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Helix STO 2.49, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands. r.tuinier@tue.nl.

The European Physical Journal. E, Soft Matter
|November 30, 2016
PubMed
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Weakly adhesive polymers in colloidal dispersions shift phase stability to higher concentrations. This contrasts with traditional theories, offering a more accurate model for colloid-polymer mixtures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Classical depletion theories assume zero polymer concentration at colloid surfaces.
  • Weakly adhesive polymers exhibit non-zero surface concentration, deviating from this assumption.
  • Understanding colloid-polymer interactions is crucial for designing advanced materials.

Purpose of the Study:

  • To develop a new theoretical framework for colloid-polymer mixtures with weakly adhesive polymers.
  • To investigate the impact of non-zero surface polymer concentration on phase behavior.
  • To provide a more accurate model for predicting phase diagrams in such systems.

Main Methods:

  • Generalized free-volume theory for colloid-polymer mixtures.
  • Self-consistent mean-field theory for polymers at surfaces.
  • Comparison with experimental data and Monte Carlo simulations.

Main Results:

  • Weak polymer adhesion shifts phase stability to higher polymer concentrations.
  • The new theory predicts phase diagrams consistent with experimental observations.
  • Results align with Monte Carlo simulations for silica sphere/PDMS/cyclohexane mixtures.

Conclusions:

  • The developed theory accurately captures the phase behavior of colloid-polymer systems with weak adhesion.
  • Non-zero surface polymer concentration is a critical factor in phase stability.
  • This work refines understanding of depletion effects in polymer-mediated colloidal systems.