Pore size distributions were investigated via mercury porosimetry on an automated porosimeter (Autopore IV, micromeritics) using 22 cm 2 of sample (0.3 g) and a penetrometer with 0.412 mL stem volume. Pore size distributions were computed assuming an Hg contact angle of 130°, and an Hg surface tension of 485 dynes cm -1 . A pressure ramp from 3.3 kPa to 137 MPa was applied to the sample (pore diameter range: 9 nm to 370 μm, i.e. meso/macro-porosity). The pore size distribution was depicted against the absorption volume (in μL cm -2 ) for each pore size.