“…6). This phenomenon had already been described for some aerogels (for example, based on cellulose acetate (Fischer, Rigacci, Pirard, Berthon-Fabry, & Achard, 2006;polyurethane (Pirard et al, 2003), silica (Majling, Komarneni, & Fajnor, 1995;Scherer, Smith, Qiu, & Anderson, 1995) and silicazirconia (Pirard, Blacher, Brouers, & Pirard, 1995)). A buckling theory for hyper-porous materials was developed by Pirard et al (1995) allowing building pore size distribution according to the equation correlating the size of the largest pores L remaining after compression at pressure P:…”