Nanoscale surface observation of feldspar dissolved under supercritical CO2–water–mineral system

As part of our assessment program on underground CO2 storage, we studied the dissolution of feldspar in aqueous solutions of supercritical CO2 at 25, 50, 65, and 80 °C with a constant CO2 pressure of 10 MPa. Atomic force microscopy (AFM) was then used to observe nanoscale dissolution features on the feldspar surface. The average dissolution rates of anorthite during the initial 1 week of dissolution were estimated from surface retreat based on vertical cross-section profiles.