title: Influence of temperature and pressure on quartz-water-CO₂ contact angle and CO₂-water interfacial tension.
abstract: We measured water-CO2 contact angles on a smooth quartz surface (RMS surface roughness ∼40 nm) as a function of pressure and temperature. The advancing water contact angle θ was 0° at 0.1 MPa CO2 pressure and all temperatures tested (296-343 K); θ increased significantly with increasing pressure and temperature (θ=35° at 296 K and θ=56° at 343 K at 20 MPa). A larger θ implies less structural and residual trapping and thus lower CO2 storage capacities at higher pressures and temperatures. Furthermore we did not identify any significant influence of CO2-water equilibration on θ. Moreover, we measured the CO2-water interfacial tension γ and found that γ strongly decreased with increasing pressure up to ∼10 MPa, and then decreased with a smaller slope with further increasing pressure. γ also increased with increasing temperature.
authors.affiliation: Curtin University, Department of Petroleum Engineering, 26 Dick Perry Avenue, 6151 Kensington, Australia.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Sarmadivaleh
authors.affiliation: Curtin University, Department of Petroleum Engineering, 26 Dick Perry Avenue, 6151 Kensington, Australia.
authors.forename: Ahmed Z
authors.initials: AZ
authors.lastname: Al-Yaseri
authors.affiliation: Curtin University, Department of Petroleum Engineering, 26 Dick Perry Avenue, 6151 Kensington, Australia. Electronic address: stefan.iglauer@curtin.edu.au.
authors.forename: Stefan
authors.initials: S
authors.lastname: Iglauer
keywords: Carbon dioxide; Carbon geo-sequestration; Contact angle; Interfacial tension; Quartz; Residual trapping; Structural trapping; Temperature