E3S Web Conf.
Volume 205, 20202nd International Conference on Energy Geotechnics (ICEGT 2020)
|Number of page(s)||5|
|Section||Minisymposium: Solid-Fluid Interactions in Emerging Energy Geo-Systems (organized by Shahrzad Roshankhah and Seunghee Kim)|
|Published online||18 November 2020|
Impacts of motile Escherichia coli on air-water surface tension
Geosystems Engineering, Georgia Institute of Technology, 790 Atlantic Drive Atlanta, GA, USA
* Corresponding author: email@example.com
Immiscible multiphase flow in porous media is largely affected by interfacial properties, manifested in contact angle and surface tension. The gas-liquid surface tension can be significantly altered by suspended particles at the interface. Particle-laden interfaces have unique properties, for example, a lower surface tension of interfaces laden with surfactants or nanoparticles. This study investigates the impacts of a motile bacterium Escherichia coli (E. coli, strain ATCC 9637) on the air-water surface tension. Methods of the maximum bubble pressure, the du Noüy ring, and the pendant droplet are used to measure the surface tension of the motile-bacteria-laden interfaces. Measured surface tension remains independent to the E. coli concentration when using the maximum bubble pressure method, decreases with increased E. coli concentration in the du Noüy ring method, and presents time-dependent changes by the pendant drop method. The analyses show that the discrepancies may come from the different convection-diffusion processes of E. coli in the flow among various testing methods.
© The Authors, published by EDP Sciences, 2020
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