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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...
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...
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...
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...
Filtration00:53

Filtration

Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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...

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Related Experiment Video

Updated: Jun 22, 2026

Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
12:47

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Published on: October 4, 2012

An agglomeration-based model for colloid filtration.

Jaideep Chatterjee1, Santosh Kumar Gupta

  • 1Hindustan Unilever Research Center, 64 Main Road, Whitefield, Bangalore, India 560066. Jaideep.chatterjee@unilever.com

Environmental Science & Technology
|June 24, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new colloid filtration model that considers particle aggregation. The model accurately predicts colloid concentration changes in porous media, improving understanding of contaminant transport.

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Last Updated: Jun 22, 2026

Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

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Area of Science:

  • Environmental science
  • Water treatment
  • Colloid and surface chemistry

Background:

  • Colloid filtration is crucial for water purification.
  • Existing models often overlook particle aggregation, a key factor in removal efficiency.
  • Understanding colloid behavior in porous media is essential for predicting contaminant transport.

Purpose of the Study:

  • To develop a novel depth filtration model incorporating colloid aggregation.
  • To experimentally validate the model's predictions against observed colloid concentration profiles.
  • To provide a framework for predicting colloid transport in groundwater.

Main Methods:

  • Experimental measurement of colloid concentration profiles (C(x)) in saturated porous media.
  • Development of a new depth filtration model based on material balances of colloidal aggregates.
  • Parameter estimation techniques for the developed model.

Main Results:

  • Log of C(x) significantly deviated from linearity, indicating aggregation effects.
  • Preaggregation of colloids correlated with their retention in porous media.
  • The new model demonstrated a good match with experimental data for varying cation concentrations.

Conclusions:

  • Colloid aggregation significantly influences filtration and retention in porous media.
  • The developed model accurately predicts colloid concentration variations, accounting for aggregate size.
  • This model offers a valuable tool for predicting colloid transport in environmental systems, including groundwater.