*2.7. DLS Characterization of Retentate*

Liquid phase was monitored by the dynamic light scattering technique. DLS experiments were performed at 25 ◦C with Malvern Nano ZS instrument (λ = 633 nm, operating power 4 mW) at θ = 173◦. Gypsum was always taken as a light scattering material even for the pure PAA-F1 solutions.
