The Effect of Salinity and pH on Wettability Alteration of Kaolinite Films Studied by Contact Angle Measurement

Santha, Nipada; Cubillas, Pablo; Greenwell, Chris

doi:10.3997/2214-4609.201900172

Cited by 2 publications

(1 citation statement)

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“…The cell surface of microbes has wetting properties more neutral wet than the SiO 2 surface; thus, the wettability is altered depending on the nature of the bacterial cell's membrane structure. Similarly, the increased pH due to microbial growth can also result in increased hydrophobicity, that can be explained by the protonation state of the polar molecules and, thus the number of charged surface species at the interface of H 2 /aqueous/SiO 2 (Santha et al, 2019).…”

Section: Microbial-induced Wettability Alterationmentioning

confidence: 99%

Pore-scale study of microbial hydrogen consumption and wettability alteration during underground hydrogen storage

et al. 2023

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Hydrogen can be a renewable energy carrier and is suggested to store renewable energy and mitigate carbon dioxide emissions. Subsurface storage of hydrogen in salt caverns, deep saline formations, and depleted oil/gas reservoirs would help to overcome imbalances between supply and demand of renewable energy. Hydrogen, however, is one of the most important electron donors for many subsurface microbial processes, including methanogenesis, sulfate reduction, and acetogenesis. These processes cause hydrogen loss and changes of reservoir properties during geological hydrogen storage operations. Here, we report the results of a typical halophilic sulfate-reducing bacterium growing in a microfluidic pore network saturated with hydrogen gas at 35 bar and 37°C. Test duration is 9 days. We observed a significant loss of H2 from microbial consumption after 2 days following injection into a microfluidic device. The consumption rate decreased over time as the microbial activity declined in the pore network. The consumption rate is influenced profoundly by the surface area of H2 bubbles and microbial activity. Microbial growth in the silicon pore network was observed to change the surface wettability from a water-wet to a neutral-wet state. Due to the coupling effect of H2 consumption by microbes and wettability alteration, the number of disconnected H2 bubbles in the pore network increased sharply over time. These results may have significant implications for hydrogen recovery and gas injectivity. First, pore-scale experimental results reveal the impacts of subsurface microbial growth on H2 in storage, which are useful to estimate rapidly the risk of microbial growth during subsurface H2 storage. Second, microvisual experiments provide critical observations of bubble-liquid interfacial area and reaction rate that are essential to the modeling that is needed to make long-term predictions. Third, results help us to improve the selection criteria for future storage sites.

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Section: Microbial-induced Wettability Alterationmentioning

confidence: 99%

Pore-scale study of microbial hydrogen consumption and wettability alteration during underground hydrogen storage

et al. 2023

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Microbes in porous environments: from active interactions to emergent feedback

Jin,

Sengupta

2024

Biophys Rev

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Microbes thrive in diverse porous environments—from soil and riverbeds to human lungs and cancer tissues—spanning multiple scales and conditions. Short- to long-term fluctuations in local factors induce spatio-temporal heterogeneities, often leading to physiologically stressful settings. How microbes respond and adapt to such biophysical constraints is an active field of research where considerable insight has been gained over the last decades. With a focus on bacteria, here we review recent advances in self-organization and dispersal in inorganic and organic porous settings, highlighting the role of active interactions and feedback that mediates microbial survival and fitness. We discuss open questions and opportunities for using integrative approaches to advance our understanding of the biophysical strategies which microbes employ at various scales to make porous settings habitable.

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The Effect of Salinity and pH on Wettability Alteration of Kaolinite Films Studied by Contact Angle Measurement

Cited by 2 publications

References 0 publications

Pore-scale study of microbial hydrogen consumption and wettability alteration during underground hydrogen storage

Pore-scale study of microbial hydrogen consumption and wettability alteration during underground hydrogen storage

Microbes in porous environments: from active interactions to emergent feedback

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