One of the most important challenge of material science consists in the elaboration of devices that can efficiently generate, store and transfer energy. In particular, intrusion and extrusion of a non-wetting liquid in porous lyophobic systems is a promising technology investigated first by Eroshenko and co-workers, where the non-wetting liquid penetrates the pores under high pressure, resulting in conversion of mechanical energy into fluid-solid interface energy. When the pressure is released, the mechanical energy can be restored upon release of the fluid. Historically, intrusion of water in pure-silica zeolites (also called "zeosils") has been first reported in 2001 and represents the starting point of subsequent intrusion and extrusion experiments performed on various zeosils. Later, Tzanis and co-workers discovered that replacing water by electrolyte solutions was an effective way to increase mechanical energy stored in zeosils, because of the shift of intrusion pressure towards higher values.