Contamination of silica surfaces: Impact on water–CO2–quartz and glass contact angle measurements

By S. Iglauer, Abdulsalam Hassan Ahmed Salamah, M. Sarmadivaleh, Keyu Liu, C. Phan. 2014

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Capillary trapping for geologic carbon dioxide storage - From pore scale physics to field scale implications (2015, background): “While the observations for sandstones show water-wet behaviour it is known that organic rich material such as coal and surfaces that have been contaminated with hydrocarbons can exhibit mixed- or CO2-wet behaviour (Iglauer et al., 2014a).”
Wettability of nanofluid-modified oil-wet calcite at reservoir conditions (2018, methodology): “Based on the above observation, all nanofluid-modified samples were exposed to 20 MPa pressure for 120 min to avoid any possible nano-impurities resulting from nanoparticles desorption that can dramatically impact the accuracy of contact angle measurements [36].”
Effect of temperature and SiO2 nanoparticle size on wettability alteration of oil-wet calcite (2017, methodology): “Cleaning steps are crucial in contact angle measurements as residual contaminations can lead to systematic errors [58].”