Interfacial phenomena of aqueous systems in dense carbon dioxide

A statistical analysis of the effects of pressure, temperature and salinity on contact angles in CO 2 –brine–quartz systems

“…This relationship is well demonstrated in the results of Jung and Wan (2012), which show water contact angles "increasing steeply as the pressure increases from 7 MPa to about 10 MPa" then remaining largely constant at pressures above 10 MPa. This may be related to the CO 2 behaviour becoming non-ideal at 10 MPa (Dickson et al, 2006), at which point there is significant miscibility between the phases (Sutjiadi-Sia et al, 2008), and suggests that there may be more to the pressure effect than just the phase of the CO 2 . We also note that, unlike the results of Dickson et al (2006) and Sutjiadi-Sia et al (2008), the recent experiment of Li and Fan (2015) using a CO 2 -brine-glass system reported no trends in contact angle from pressure increases, though a large jump in contact angle was evident when CO 2 phase changed from gas to liquid (at 20 • C) or gas to supercritical (at 40 • C); their contact angles are similar to those of Espinoza and Santamarina in displaying no pressure trends but a marked increase in contact angles in brine (circa 40 • ) relative to water (circa 30 • ).…”

“…For example, Dickson et al (2006) and Sutjiadi-Sia et al (2008) both report an increasing trend in water contact-angles (on glass) in gaseous CO 2 as pressure increases but no further increase in contact angle once the CO 2 is in a supercritical state. Similar trends are evident in some of the contact-angle studies undertaken in a geosequestration context (Chiquet et al, 2007;Bikkina, 2010;Broseta et al, 2012;Jung and Wan, 2012) though we note that other studies found no trend with pressure (Espinoza and Santamarina, 2010;Farokhpoor et al, 2013).…”

Interfacial tensions of systems comprising water, carbon dioxide and diluent gases at high pressures: Experimental measurements and modelling with SAFT-VR Mie and square-gradient theory

“…In fact, numerous workers have measured the interfacial tension of the (CO 2 + H 2 O) system [65,[72][73][74][75][76][77][78][79][80][81][82][83][84][85]. However, as discussed by Georgiadis et al [65], there is significant disagreement between some of these sources and a number of possible causes can be identified; these include the effects of trace impurities diffusing to the interface (especially in long-duration experiments), imperfect temperature regulation, and inaccuracy in the density difference between the two coexisting phases.…”

Sessile drop evaporation on (super)hydrophobic surfaces: Effect of low pressure on the contact line dynamics

“…Previous experimental [27][28][29][30] and numerical [31,32] studies dealing with the pressure dependence of both the interfacial energies and the contact angle showed that an increase of pressure, at constant temperature, induces a decrease of the surface tension. The referred experiments require however the presence of a second component as an inert gas, which modifies the pressure sensitivity of the system [27].…”