Fig. 8.

Local density calculations (Eq. (9), middle expression) for the Si–Si and O–O radial distribution functions in dry MCM41 (a), and for the OW–OW and HW–HW radial distribution functions in wet MCM41 at 298 K (b) and 210 K (c). The straight lines defined by Eq. (9), right-hand expression, were fit in the region 5–15 Å. Parameters from these fits are given in Table 2. For O–O and HW–HW it was assumed the local density was twice the Si and OW local densities respectively, and the confining dimensions for O and HW were assumed to be the same as for Si and OW respectively.