Field GPR monitoring of biostimulation in saturated porous media

McGlashan, M.; Tsoflias, G. P.; Schillig, P. C.; Devlin, J.F.; Roberts, J. A. Fraser

doi:10.1016/j.jappgeo.2011.08.006

Cited by 9 publications

(5 citation statements)

References 58 publications

(68 reference statements)

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“…vibration and CAO stretching vibration, which indicate the existence of ester group. The methyl and methylene group exhibit absorption bands at 3000 cm 21 . The V-POSS shows two characteristic absorptions at 1109 cm 21 and 585 cm 21 , which are assigned to SiAOASi stretching and bending vibration, respectively [1].…”

Section: Resultsmentioning

confidence: 99%

“…In the spectra of M-POSS, the band at 3417 cm 21 and 1116 cm 21 are assigned as stretching vibration of SiAOH and stretching vibration of SiAOASi of silsesquioxane cages, respectively. However, M-POSS exhibits the obvious band at 2958 and 1718 cm 21 assigned as ACH 3 , ACH 2 , and C@O, which is different from V-POSS.…”

Section: Resultsmentioning

confidence: 99%

“…FTIR spectra of liquid samples of V-POSS and M-POSS and compression molded thin film samples of polymerized PMMA and POSS/PMMA composites were carried on a IS10 Fourier transform infrared spectroscopy of American Nicolet, and the scan range was 400-4000 cm 21 .…”

Section: Characterizationmentioning

confidence: 99%

“…In view of the specific structure of POSS with more than two functional groups, they are perfect structure‐guiding agents for the synthesis of star‐shape or network polymers. Therefore, some researchers are shifting their interests toward this area, and some efforts have been made so far . The types of POSS and the preparation methods of composites can greatly influence the thermal properties of POSS/PMMA nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Jiao

Wang

et al. 2014

Polym Eng Sci

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Octa‐vinyl polyhedral oligomeric silsesquioxane (V‐POSS) and octa‐(methacryloxy) propyl polyhedral oligomeric silsesquioxane (M‐POSS) were incorporated into PMMA to prepare POSS/PMMA hybrid materials at molecular level via in situ polymerization. The resulting hybrid materials showed only swelling instead of solution in ethyl acetate, while pristine PMMA completely dissolved in ethyl acetate; moreover, the M‐POSS/PMMA hybrid materials exhibited more excellent resistance to solvent stress cracking. An excellent transparency was observed for all hybrid materials. Incorporation of V‐POSS and M‐POSS significantly improved thermal properties of PMMA. The thermal decomposition temperature of hybrid materials was enhanced except a slightly compromised initial decomposition temperature. The hybrid materials prepared with 0.2–0.6 mol% M‐POSS or V‐POSS improved the reinforcing and toughening properties in comparison to pristine PMMA. Also, the incorporation of POSS decreased the dielectric constant and dielectric loss of the hybrid materials with more voids introduced into the composites no matter the structure of POSS. POLYM. ENG. SCI., 55:565–572, 2015. © 2014 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Jiao

Wang

et al. 2014

Polym Eng Sci

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“…In-situ geophysical monitoring of subsurface fluid saturation changes and contamination is important for environmental protection and oil industry, for instance (1) leakage at buried waste sites, (2) contaminant remediation in groundwater, and (3) fluid injection for enhanced petroleum recovery. Geophysical monitoring of groundwater contamination has been examined by many methods with geophysical instruments (e.g., Greenhouse and Monier-Williams, 1985;Benson et al, 1997;Buselli and Lu, 2001;McGlashanb et al, 2012). Commonly-used geophysical methods for monitoring groundwater contamination and plume migration include geoelectrical methods (e.g., Mazac et al, 1987;de Lima et al, 1995;Benson et al, 1997;Sauck, 2000;Nwankwo and Emujakporue, 2012;Bellmunt et al, 2016) and ground penetrating radar methods (e.g., Benson, 1995;Daniels et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Geophysical monitoring of subsurface contamination in two-phase porous media

Zhang

Spetzler

2016

Journal of Applied Geophysics

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We have explored a new technology based on using low-frequency strain attenuation data to monitor the infiltration of contaminants into two-fluid phase porous materials. The attenuation mechanism is related to the loss of energy due to the hysteresis of resistance to meniscus movement (changes in surface tension and wettability) when a pore containing two fluids is stressed at very low frequencies. This phenomenon was verified in our laboratory experiments and applied to a field study near Maricopa, Arizona. In the field study we conducted controlled experiments with the aim of detecting and monitoring the infiltration of a contaminant-a biosurfactantinto groundwater. Three sets of geophysical instruments, each consisting of a 3component seismometer and a tiltmeter, were installed near an irrigation site. The experiment lasted about 3 years with controlled irrigations of initially water only and then water with contaminant into the vadose zone. We used naturally occurring signals of microseisms for our seismic sources and solid Earth tides as sources for the tilt signals. To process the tilt data we extracted the tidal signal from the raw data, and then compared the measured tidal signals with site-specific theoretical data. Changes in tidal signals indicate a strong anomaly associated with the irrigation when a 150 ppm concentration of a biosurfactant was present. No such anomaly was detected when only water was used. Further data processing with an automated procedure shows that the anomalies still persisted. Furthermore, the microseismic results from the seismic data suggest that there may also be a detectable anomaly.

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Water and Wastewater Purification Using Periphyton

2017

Periphyton

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Field GPR monitoring of biostimulation in saturated porous media

Cited by 9 publications

References 58 publications

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

The effects of structure of POSS on the properties of POSS/PMMA hybrid materials

Geophysical monitoring of subsurface contamination in two-phase porous media

Water and Wastewater Purification Using Periphyton

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