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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...

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Related Experiment Video

Updated: Jun 26, 2025

Transport of Surface-modified Carbon Nanotubes through a Soil Column

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Published on: April 2, 2015

Colloid Transport in Bicontinuous Nanoporous Media.

Aoyan Liang¹, Chang Liu¹, Paulo S Branicio¹

¹Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-0242, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 17, 2024

Summary

Colloid transport in nanoporous media is governed by straining and trapping. Higher colloid concentration and attraction to media increase retention, potentially causing clogging.

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Area of Science:

Earth Science
Nanotechnology
Fluid Dynamics

Background:

Colloid transport and retention are crucial in Earth science applications like groundwater remediation and oil recovery.
Nanoporous media present unique challenges due to boundary layer effects and nanoconfinement altering colloid behavior.

Purpose of the Study:

To simulate colloid transport and retention in bicontinuous nanoporous (BNP) media using particle dynamics models.
To elucidate colloid retention mechanisms and investigate the influence of key factors on colloid transport.

Main Methods:

Utilized particle dynamics models to simulate colloid transport in BNP media under pressure gradients.
Tracked individual colloid movement to identify retention mechanisms and analyzed breakthrough curves.

Main Results:

Identified physical straining and trapping in low-flow zones as primary retention mechanisms under unfavorable conditions.
Higher colloid volume fraction (d), lower pressure difference (ΔP), and strong colloid-media attraction (Ec-p) increase retention, leading to clogging.
Colloid-colloid interactions (Ec-c) showed minimal impact due to confined nanoporous channels.

Conclusions:

Fundamental factors governing colloid transport and retention in stochastic nanoporous materials have been identified.
Understanding these factors is critical for optimizing processes in groundwater remediation and enhanced oil recovery.