“…1b). The latter corresponds to voids between spherical nonporous nanoparticles (average diameter 8.3 nm) randomly packed in aggregates (<1 m in size) and agglomerates of aggregates (>1 m) [8,28,[42][43][44]. The average pore radius (determined as the ratio of the first and zero moments of the differential PSD) is 2.1, 4.7, 6.9, and 12.2 nm for Si-40, Si-60, Si-100, and A-300, respectively.…”