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Related Concept Videos

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...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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...
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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Related Experiment Video

Updated: Jul 14, 2026

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts
10:37

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

Published on: April 9, 2016

Cationic flocculants carrying hydrophobic functionalities: applications for solid/liquid separation.

S Schwarz1, W Jaeger, B-R Paulke

  • 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany. simsch@ipfdd.de

The Journal of Physical Chemistry. B
|July 5, 2007
PubMed
Summary

Hydrophobic polycations enhance particle flocculation by widening the effective dosage range, especially in low-charge dispersions. Increased hydrophobicity and molecular weight improve flocculation efficiency and stability.

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Last Updated: Jul 14, 2026

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts
10:37

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

Published on: April 9, 2016

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Area of Science:

  • Polymer Chemistry
  • Colloid Science
  • Materials Science

Background:

  • Polycations are widely used as flocculants in various industrial processes.
  • Understanding the influence of polymer structure on flocculation behavior is crucial for optimizing performance.
  • Hydrophobic substituents on polycation backbones can significantly alter their interaction with charged surfaces.

Purpose of the Study:

  • To investigate the flocculation behavior of three series of polycations with varying hydrophobic substituents.
  • To determine the impact of polycation hydrophobicity, molecular weight, and ionic strength on flocculation efficiency.
  • To explore the role of substrate surface charge density in polycation-mediated flocculation.

Main Methods:

  • Synthesis of polycations with narrow molecular weight distributions and hydrophobic substituents.
  • Flocculation experiments using monodisperse polystyrene latexes and kaolin dispersions.
  • Analysis of charge density, molecular weight, and hydrophobicity effects on flocculation parameters.

Main Results:

  • Polycation charge density decreased with increasing hydrophobicity and molecular weight.
  • Hydrophobic functionalities broadened the flocculation window, especially at high substrate charge densities and ionic strengths.
  • In low-charge dispersions, hydrophobic interactions became dominant, increasing the flocculation window with hydrophobicity and molecular weight.
  • Flocculant dosage increased with particle size and decreased particle number.

Conclusions:

  • Hydrophobic polycations offer improved control over the flocculation process, widening the effective dosage range.
  • The interplay between polycation hydrophobicity, molecular weight, and substrate charge density dictates flocculation efficiency.
  • Optimizing polycation structure and dispersion conditions can enhance phase separation and stability in colloidal systems.