The resulting solution was cast using a doctor blade (BYK, Germany) on a clean glass plate with an automatic film applicator. To ensure uniform formation of a film during curing, the glass substrate was covered with a glass cover to slow down the evaporation process. The Glass plate was then placed into the oven for curing at 110 °C overnight. Thickness measurements for the prepared membranes were performed via SEM. The thickness of the measured films was around 60 µm to 80 µm (see SEM images).