Influence of temperature and pressure on quartz–water–CO2 contact angle and CO2–water interfacial tension

• Published in: Journal of colloid and interface science Vol. 441; pp. 59 - 64
• Main Authors: Sarmadivaleh, Mohammad, Al-Yaseri, Ahmed Z., Iglauer, Stefan
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.03.2015
• Subjects: Carbon dioxide; Carbon geo-sequestration; Contact angle; Interfacial tension; Quartz; Residual trapping; Structural trapping; Temperature; Structural trapping; Carbon geo-sequestration; Temperature; Interfacial tension; Carbon dioxide; Residual trapping; Contact angle; Quartz
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2014.11.010

[Display omitted] •Significant water contact angle increase with pressure increase.•Significant water contact angle increase with increasing temperature.•No effect of CO2–water equilibration on water contact angle.•Strong decrease of CO2–water interfacial tension with pressure and increase with temperature. We measured water–CO2 contact angles on a smooth quartz surface (RMS surface roughness ∼40nm) as a function of pressure and temperature. The advancing water contact angle θ was 0° at 0.1MPa CO2 pressure and all temperatures tested (296–343K); θ increased significantly with increasing pressure and temperature (θ=35° at 296K and θ=56° at 343K at 20MPa). 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 ∼10MPa, and then decreased with a smaller slope with further increasing pressure. γ also increased with increasing temperature.