Absorption and diffusion process at the CO₂-decane interface considering density fluctuations near the critical CO₂ point

Based on a new conceptual model, which considers CO₂ density fluctuations in the critical range, we were able to consistently explain the time dependence of the volume increase for the respective thermodynamic state. The experimental results confirm the new conceptual model that volume swelling in the non-critical pressure range (&lt; 6 MPa) is a <i>surface effect with limited penetration depth</i>.