Small angle X-ray scattering of nanoporous membranes: Effects of geometry and concentration

YW Shi and YY Zhang and S Chen and SN Luo, MATERIALS TODAY COMMUNICATIONS, 34, 105095 (2023).

DOI: 10.1016/j.mtcomm.2022.105095

We explore the effects of geometry and concentration on small angle X-ray scattering (SAXS) of nanoporous membranes. SAXS patterns of membranes with different pore radius/length distributions, angular distributions of pore axis, pore concentrations, and incident X-ray geometries, are obtained with ultralarge atom-based simulations. Scattering curves are accurately extracted from 2D SAXS patterns with elliptical or rectangular filters, and interpreted via the total non- negative least square method, without any a priori constraints on size distribution. We demonstrate the feasibility and limitations of retrieving structure parameters of complicated nanoporous membranes from SAXS patterns, and provide a guidance for SAXS experiments and data interpretation.

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