I want to prepare microfiltration flat membranes with PVDF or polysulfone. I did the process by solving various concentrations of the polymers (from 13 to 15%) to NMP to produce the casting solution base on the other articles using non-solvent induced phase separation method with a fixed height of 100 μm. However, the surface of the as-prepared membranes are dense in SEM images and no obvious pores (larger than 100 nm) can be seen. I would be very appreciated if someone help me.
I would suggest trying to use PEG or PVP as an additive in the casting solution as they can help in forming more pores.
Read more in : The influence of PEG molecular weight on morphologies and properties of PVDF asymmetric membranes, doi:10.1142/S0256767908003072
Effects of pore-forming additives on structures and properties of PVDF/Fe3+/Cu2+ hollow fiber membranes, doi:https://doi.org/10.1080/19443994.2013.781741
Hi Seyed Behnam Ghaffari
If you didn't use the pore-former agent, you should use these materials such as PVP, PEG and so on. Or, you can use deep eutectic solvents (DES) as a new pore former agent for this issue refer to this article doi.org/10.1016/j.memsci.2020.118528.
Best wishes
You can read: Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation
Article Preparation and characterization of PVDF flat-sheet membrane...
also: Preparation of polysulfone membranes via vapor-induced phase separation and simulation of direct-contact membrane distillation by measuring hydrophobic layer thickness
Article Preparation of polysulfone membranes via vapor-induced phase...
Thanks so much for your help.
Mohamed Khedawy
Ahmad Dehqan
Roqaya Ismail
PVDF is OK, not only inside-outside but also outside-inside operation mode, there are lots of successful operation projects around China and all over the world. Du-pont\ KOCH, and many other famous company have their own PVDF flat membrane production, it is widly used around the world.
- Badges
- Science topic
- Similar topics
- Biological Science
- Histology
- Fixatives