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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...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
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...
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...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...

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Related Experiment Video

Updated: Jun 17, 2026

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

Phase behavior of repulsive polymer-tethered colloids.

Behnaz Bozorgui1, Maya Sen, William L Miller

  • 1Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.

The Journal of Chemical Physics
|January 19, 2010
PubMed
Summary

Molecular dynamics simulations reveal how polymer properties influence colloidal particle organization. Different polymer behaviors (ideal vs. self-avoiding) lead to distinct ordered structures at moderate densities.

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Last Updated: Jun 17, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Polymer Physics

Background:

  • Colloidal particles with attached polymers are fundamental in materials science.
  • Understanding their self-assembly is key to designing novel materials.
  • Previous studies often use simplified polymer models.

Purpose of the Study:

  • To investigate the impact of polymer length and behavior on colloidal self-assembly.
  • To explore phase formation in compressed polymer-tethered colloidal systems.
  • To compare explicit polymer models with coarse-grained approaches.

Main Methods:

  • Molecular dynamics simulations were performed.
  • An explicit polymer model was employed.
  • Systems were compressed to moderate volume fractions.

Main Results:

  • A variety of ordered phases were observed.
  • Phase formation is linked to the configurational entropy of polymers and colloids.
  • The length and behavior (ideal or self-avoiding) of polymers significantly affect ordering.

Conclusions:

  • Explicit polymer models provide detailed insights into colloidal self-assembly.
  • Configurational entropy is a critical factor driving phase formation.
  • The study defines the applicability limits of coarse-grained polymer models for these systems.