we are tried all different concentrations of polymer (Polysulfone) and solvents (NMP & DMF) to synthesis FO membrane. but unfortunately every time polymer penetration occurs across the fabric that results in poor water flux in FO testing.
kindly guide a way through which we can avoid penetration of solvent across the support fabric.
thank you
First of all, sorry for late response.
In our work, we applied different types of polymeric hydrogels, and we did not noticed any penetration of the particles.
According to our experimental work and our readings, this issue does not exist in the application of hydrogels as draw agents because it is a solid dry material, which swells with water without dissolution.
The phenomenon of reverse diffusion of solutes occurs when solutions are applied as draw agents, and it is called reverse solute flux. This issue is widely discussed in previous studies.
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