After one wash, which removes any unreacted components, the monolith is supercritically dried. Overall, all liquid-phase cross-linking strategies, whether one pot or multi step, cause significant increase in strength (up to 8 MPa) but, on the other hand, they increase the density (≈ 0.5–0.8 g.cm − 3 ) and decrease the surface area (≈ 40 ...