The hysteresis cycle isdue to the capillary condensation phenomenon characteristic of amesoporous material (pore diameter between 2 nm and less than50 nm).
On each hysteresis cycle, shoulders, characteristic of sev-eral families of mesopores, are observed at P/P0= 0.5. Accordingto the BET and Barrett–Joyner–Halenda (BJH) methods, the valuesof specific surface area pore size and pore volume (Table 3) werecalculated. An increase of specific surface area is observed whenthe ration CH/BG increases: 6.90 (± 0.07) m2g−1for 1CH-2BG scaf-folds, 7.60 (± 0.08) m2g−1for 1CH-1BG and 7.90 (± 0.08) m2g−1for