Pore-scale visualization of colloid transport and retention in partly saturated porous media

John T. Crist, John F. McCarthy, Yuniati Zevi, Philippe C. Baveye, James A. Throop, Tammo S. Steenhuis

Research output: Contribution to journalArticle

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Abstract

In unsaturated porous media, sorption of colloids at the air–water (AW) interface is accepted as a mechanism for controlling colloid retention and mobilization. However, limited actual pore-scale observations of colloid attachment to the AW interface have been made. To further investigate these processes, a real-time pore-scale visualization method was developed. The method builds on the light transmission technique for fingered flow studies in packed-sand infiltration chambers and combines it with high-resolution, electro-optical hardware and public domain imaging software. Infiltration and drainage of suspensions of hydrophilic negatively charged carboxylated latex microspheres provides compelling visual evidence that colloid retention in sandy porous media occurs via trapping in the thin film of water where the AW interface and the solid interface meet, the air–water–solid (AWS) interface. With this modified theory of trapped colloids at the AWS interface, we are able to explain the apparent discrepancy between previous experimental evidence of hydrophilic colloids seemingly partitioning to the AW interface and more recent findings that suggest this type of colloid does not adsorb at the AW interface.
Original languageEnglish
Pages (from-to)444-450
Number of pages7
JournalVadose Zone Journal
Volume3
DOIs
StatePublished - May 2004

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colloid
water
air
porous medium
visualization
infiltration
hardware
mobilization
trapping
partitioning
sorption
drainage
software
sand

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Crist, J. T., McCarthy, J. F., Zevi, Y., Baveye, P. C., Throop, J. A., & Steenhuis, T. S. (2004). Pore-scale visualization of colloid transport and retention in partly saturated porous media. Vadose Zone Journal, 3, 444-450. DOI: 10.2113/3.2.444

Crist, John T.; McCarthy, John F.; Zevi, Yuniati; Baveye, Philippe C.; Throop, James A.; Steenhuis, Tammo S. / Pore-scale visualization of colloid transport and retention in partly saturated porous media.

In: Vadose Zone Journal, Vol. 3, 05.2004, p. 444-450.

Research output: Contribution to journalArticle

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abstract = "In unsaturated porous media, sorption of colloids at the air–water (AW) interface is accepted as a mechanism for controlling colloid retention and mobilization. However, limited actual pore-scale observations of colloid attachment to the AW interface have been made. To further investigate these processes, a real-time pore-scale visualization method was developed. The method builds on the light transmission technique for fingered flow studies in packed-sand infiltration chambers and combines it with high-resolution, electro-optical hardware and public domain imaging software. Infiltration and drainage of suspensions of hydrophilic negatively charged carboxylated latex microspheres provides compelling visual evidence that colloid retention in sandy porous media occurs via trapping in the thin film of water where the AW interface and the solid interface meet, the air–water–solid (AWS) interface. With this modified theory of trapped colloids at the AWS interface, we are able to explain the apparent discrepancy between previous experimental evidence of hydrophilic colloids seemingly partitioning to the AW interface and more recent findings that suggest this type of colloid does not adsorb at the AW interface.",
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Crist, JT, McCarthy, JF, Zevi, Y, Baveye, PC, Throop, JA & Steenhuis, TS 2004, 'Pore-scale visualization of colloid transport and retention in partly saturated porous media' Vadose Zone Journal, vol 3, pp. 444-450. DOI: 10.2113/3.2.444

Pore-scale visualization of colloid transport and retention in partly saturated porous media. / Crist, John T.; McCarthy, John F.; Zevi, Yuniati; Baveye, Philippe C.; Throop, James A.; Steenhuis, Tammo S.

In: Vadose Zone Journal, Vol. 3, 05.2004, p. 444-450.

Research output: Contribution to journalArticle

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AB - In unsaturated porous media, sorption of colloids at the air–water (AW) interface is accepted as a mechanism for controlling colloid retention and mobilization. However, limited actual pore-scale observations of colloid attachment to the AW interface have been made. To further investigate these processes, a real-time pore-scale visualization method was developed. The method builds on the light transmission technique for fingered flow studies in packed-sand infiltration chambers and combines it with high-resolution, electro-optical hardware and public domain imaging software. Infiltration and drainage of suspensions of hydrophilic negatively charged carboxylated latex microspheres provides compelling visual evidence that colloid retention in sandy porous media occurs via trapping in the thin film of water where the AW interface and the solid interface meet, the air–water–solid (AWS) interface. With this modified theory of trapped colloids at the AWS interface, we are able to explain the apparent discrepancy between previous experimental evidence of hydrophilic colloids seemingly partitioning to the AW interface and more recent findings that suggest this type of colloid does not adsorb at the AW interface.

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Crist JT, McCarthy JF, Zevi Y, Baveye PC, Throop JA, Steenhuis TS. Pore-scale visualization of colloid transport and retention in partly saturated porous media. Vadose Zone Journal. 2004 May;3:444-450. Available from, DOI: 10.2113/3.2.444