Coating of surfaces with particles formed by the RESS process using a crystallizing hydrophobic
compounds gives the surface superhydrophobic, self-cleaning properties. In many cases, water contact angles
between 150-170 ° are obtained. In addition, mixing the wax AKD with a natural smaller crystallizing
compound gives a surface of two structural levels of roughness, one of around 1-2 μm and the second one of
around 10-20 μm which will improve the superhydrophobic properties of the surface. Superhydrophobic
surfaces can also be prepared using a hydrophobic “CO2-philic” polymer, which is promising when striving
towards more robust, wear-resistant surfaces. Finally, Raman spectgroscopy is a novel tool to determine
solubility of solutes in scCO2.