at very lowP/Po, an increase at the adsorption curves, attributing to
the presence of micropore, was observed. Pore size distributions of
the above samples, calculated via BJH method based on desorption
curves, are presented inFig. 3B. The textural characteristics of all
samples are summarized inTable 2. It could be seen that 0CTAB
exhibits a broad pore size distribution that scattered from 25 to
45 nm and concentrated atca.31 nm; 1.5CTAB shows a narrower
pore size distribution with average mesopore diameter of
2.7 nm; meanwhile, 2.2CTAB and 2.9CTAB have bimodal pore size
distributions, containing small and large mesopores, with the aver-age pore diameters ofca.3.0 and 30 nm, respectively. These results
demonstrated clearly the influence of CTAB concentration on the
size/shape and the pore structure of nanostructured MgO particles.
Thus, it is worth discussing the variation of the main characteris-