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Open AccessArticle

Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam

School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85281, USA
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Academic Editor: Marco Ragazzi
Sustainability 2016, 8(12), 1317; https://doi.org/10.3390/su8121317
Received: 20 September 2016 / Revised: 30 November 2016 / Accepted: 2 December 2016 / Published: 14 December 2016
(This article belongs to the Section Environmental Sustainability and Applications)
The foam generated by the mixture of air and water has a much higher viscosity and lower mobility than those of pure water or gas that constitutes the air-water foam. The possibility of using the air-water foam as a flow barrier for the purpose of groundwater and soil remediation is explored in this paper. A nanoparticle-stabilized air-water foam was fabricated by vigorously stirring the nano-fluid in pressurized condition. The foam bubble size distribution was analyzed with a microscope. The viscosities of foams generated with the solutions with several nanoparticle concentrations were measured as a function of time. The breakthrough pressure of foam-saturated microfluidic chips and sand columns were obtained. The hydraulic conductivity of a foam-filled sand column was measured after foam breakthrough. The results show that: (1) bubble coalescence and the Ostwald ripening are believed to be the reason of bubble size distribution change; (2) the viscosity of nanoparticle-stabilized foam and the breakthrough pressures decreased with time once the foam was generated; (3) the hydraulic conductivity of the foam-filled sand column was almost two orders of magnitude lower than that of a water-saturated sand column even after the foam-breakthrough. Based on the results in this study, the nanoparticle-stabilized air-water foam could be injected into contaminated soils to generate vertical barriers for temporary hydraulic conductivity reduction. View Full-Text
Keywords: nanoparticle; air-water foam; viscosity; breakthrough pressure; hydraulic conductivity nanoparticle; air-water foam; viscosity; breakthrough pressure; hydraulic conductivity
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MDPI and ACS Style

Zheng, X.; Jang, J. Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam. Sustainability 2016, 8, 1317. https://doi.org/10.3390/su8121317

AMA Style

Zheng X, Jang J. Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam. Sustainability. 2016; 8(12):1317. https://doi.org/10.3390/su8121317

Chicago/Turabian Style

Zheng, Xianglei; Jang, Jaewon. 2016. "Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam" Sustainability 8, no. 12: 1317. https://doi.org/10.3390/su8121317

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