This proposal is a continuation of prior combined NMR, SANS and diffraction measurements to characterise templated silicas, as part of a program to inform the behaviour of thermodynamic mesoscale metrology as one approaches nano- to atomic scales. Templated silicas such as SBA-15 offer excellent systems, with far lower variance than sol-gel silicas, to probe adsorbate thermodynamic behaviour with length-scale, the structure here being independently characterised by NS. NIMROD will generate wide Q-range data giving the high-Q asymptotic level, with good resolution when transformed to the radial domain, enabling the probing of the pore wall structure. The high-Q data will characterise the atomic-scale radial distribution functions for the different silicas separately from those for their porous structures. The data will be interpreted by existing analytic models and numerical integration.