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Related Concept Videos

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...
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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,...
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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...

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Related Experiment Video

Updated: Jul 3, 2026

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

Colloid aggregation arrested by caging within a polymer network.

Peter B Laxton1, John C Berg

  • 1Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 31, 2008
PubMed
Summary
This summary is machine-generated.

Colloidal particle aggregation in polymer gels is controlled by gel mesh size. Larger aggregates become trapped, halting further aggregation and allowing for controlled final size by adjusting gel properties.

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Area of Science:

  • Colloid and Interface Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Colloidal particle aggregation is a fundamental process in various scientific fields.
  • Controlling aggregation within confined environments like polymer gels is challenging.
  • Existing methods lack precise control over aggregate size and distribution.

Purpose of the Study:

  • To investigate colloidal particle aggregation within a polymer gel network.
  • To understand the role of gel mesh size and electrostatic interactions in controlling aggregation.
  • To develop a method for achieving controlled final aggregate sizes.

Main Methods:

  • Formulation of an isorefractive, covalently cross-linked polymer gel in dimethyl sulfoxide.
  • Utilizing a high dielectric solvent to enable electrostatic control over aggregation.
  • Solving Smoluchowski's population balance equations for immobile aggregates exceeding gel mesh spacing.
  • Calculating light scattering intensities to monitor aggregate population evolution.

Main Results:

  • Observed an asymptotic increase in light scattering intensity, consistent with model predictions.
  • Demonstrated that aggregation is arrested by the spatial constraints of the polymer gel network.
  • Showed that aggregates become caged within the gel mesh, preventing further growth.
  • Provided evidence that specific gel property formulations can control the final aggregate size.

Conclusions:

  • The spatial confinement of polymer gel networks effectively arrests colloidal aggregation.
  • Electrostatic control in conjunction with gel mesh size offers a pathway to predictable aggregate formation.
  • Tailoring gel properties presents a viable strategy for controlling the final size of colloidal aggregates.