In our research, superhydrophobic surfaces are produced using the Rapid Expansion of Supercritical
Solution (RESS) technique. Shortly, a superhydrophobic surface is produced by dissolving a crystallizing
hydrophobic compound in scCO2, followed by spraying the supercritical solution through a nozzle where the
CO2 is expanded to gas, and the dissolved compound crystallizes, resulting in rapidly moving particles hitting
the target-surface (see Figure 1). Using this methodology, we have shown that surfaces evenly covered by a
thin, anisotropic flakes with their largest dimensión in the m range,of for example the alkyl ketene dimer
(AKD) wax can be formed. Water contact angle measurements showed that the produced surfaces have
contact angles between 150-170 and with very low roll-off angles indicating that a real superhydrophobic
surface had been created with this treatment