Figure 5
Molecular Scale Characterization of Carbonate Interfaces (a) XR of calcite single crystals in contact with (ai) calcite saturated solution (CSS) and the TW2 brine (40 mM Na2SO4), and (aii) a single calcite sample that was exposed sequentially to natural petroleum oil (red circles), then the TW2 brine (blue squares), and petroleum (magenta triangle). (b) Derived density profiles for each data set shown in (a). These results show that the calcite-CSS and calcite-TW2 interfaces are equivalent, and that the original calcite-petroleum interfacial structure differs from that observed after the sample was exposed to the TW2 brine.
