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• W2793672337 abstract "Polyamide nanomembranes are at the heart of water desalination, a process which plays a critical role in clean water production. Improving their efficiency requires a better understanding of the relationship between chemistry, network structure, and performance but few techniques afford compositional information in ultrathin films $(<100$ nm). Here, we leverage resonant soft x-ray reflectivity, a measurement that is sensitive to the specific chemical bonds in organic materials, to quantify the functional group concentration in these polyamides. We first employ reference materials to establish quantitative relationships between changes in the optical constants and functional group density, and then use the results to evaluate the functional group concentrations of polyamide nanomembranes. We demonstrate that the difference in the amide carbonyl and carboxylic acid group concentrations can be used to calculate the crosslink density, which is shown to vary significantly across three different polyamide chemistries. A clear relationship is established between the functional group density and the permselectivity $(ensuremath{alpha})$, indicating that more densely crosslinked materials result in a higher $ensuremath{alpha}$ of the nanomembranes. Finally, measurements on a polyamide/poly(acrylic acid) bilayer demonstrate the ability of this approach to quantify depth-dependent functional group concentrations in thin films." @default.
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• W2793672337 date "2018-03-15" @default.
• W2793672337 modified "2023-09-23" @default.
• W2793672337 title "Functional group quantification of polymer nanomembranes with soft x-rays" @default.
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• W2793672337 doi "https://doi.org/10.1103/physrevmaterials.2.032601" @default.
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