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Coagulation

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...

Colloidal precipitates

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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Updated: Jun 9, 2026

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

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

Published on: October 4, 2012

Recycling functional colloids and nanoparticles.

Olesya Myakonkaya¹, Zhiyong Hu, Muhammad Faizan Nazar

¹School of Chemistry, University of Bristol, Bristol, BS8 1TS UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|September 10, 2010

Summary

This study explores eco-friendly methods for separating and recycling valuable nanoparticles, moving away from costly, energy-intensive techniques. It highlights advancements in sustainable nanomaterial recovery for environmental and economic gains.

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Area of Science:

Materials Science
Nanotechnology
Green Chemistry

Background:

Colloid and nanoparticle stability and separation are critical but often rely on expensive, energy-intensive methods like ultracentrifugation.
Current separation techniques pose environmental and economic challenges, hindering sustainable practices.

Purpose of the Study:

To explore recent advances in efficient and effective strategies for the separation and recovery of colloids and nanoparticles.
To promote environmentally friendly and economically viable approaches for recycling functional nanomaterials.
To identify new directions in lean engineering for high-value nanoparticles.

Main Methods:

Review of recent scientific literature on nanomaterial separation and recycling techniques.
Analysis of sustainable approaches focusing on environmental and economic benefits.
Exploration of lean engineering principles applied to nanoparticle recovery.

Main Results:

Identification of emerging strategies for the separation and recovery of functional nanomaterials.
Demonstration of the potential for reduced cost and energy consumption compared to traditional methods.
Highlighting the feasibility of recycling high-value nanoparticles such as gold (Au) and palladium (Pd).

Conclusions:

Advancements in separation technologies offer promising avenues for sustainable nanomaterial recycling.
Implementing green science principles in nanoparticle recovery yields significant environmental and economic advantages.
Lean engineering approaches are crucial for the efficient and cost-effective reuse of valuable nanomaterials.