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Water sorption isotherms for the water-based (full symbols) and permeate-based (empty symbols), unheated (Control) powders with Cas:WP ratios (%) of 91:9 (A), 81:19 (B), 43:57 (C), 7:93 (D) (n = 3–6). Indication of inversion of the water- and permeate-based curves (----). GAB equation fitted to water-based experimental data (−⋅−⋅) and permeate-based experimental data (⋅⋅⋅⋅).
