Synchrotron SAXS to probe cross-linked network of polyamide 'reverse osmosis' and 'nanofiltration' membranes

► Details of 'reverse osmosis' (RO) and 'nanofiltration' (NF) membrane structures. ► Synchrotron SAXS from cross-linked polyamide networks in 4-2094 Å length scale. ► Chains forming globular units and aggregation of the globules to mass fractal clusters. ► Relatively smoother polymer globules and larger mass fractal structures for NF.