I am preparing a membrane for water filtration purposes but I want to use solution casting method (casting the solution of the polymer on a petri dish and then let the solution dry overnight with controlled temperature conditions).
The usual way is to provide a scaffolding and after casting remove the scaffolding. For example, take a dense pack of fine NaCl (or table salt) into a container and pour polymer cast onto it (one may need to apply small vacuum for full percolation). Once cured one can simply washoff the salt with water leaving beind the porous cast.
Hi,
You can use flat bottom petri dish to pour your polymer solution. Cover the petri dish with inverted funnel and put some filter paper at the end of stem. Let solvent evaporate in controlled manner. once all the solvent is evaporated keep the petri dish in the oven let say 50-60 degrees to evaporate trace solvent.
latar you can detach membrane. you can also use teflon base for this.
Hope this helps you.
Regards,
Parimal
@Parimal thanks for your answer. I used the same technique to fabricate non-porous / dense membranes, will this way of fabricating membrane give a porous membrane? Because what I think is that the method you mentioned is typically used for casting dense membranes?
Your help in this regard is highly appreciated.
Hi, Sorry for the late answer. it depends on which polymer you are using. If you need porous membrane then you might try thermal induced phase inversion in a high moisture environment.
You need a solvent which is soluble in non-solvent vapor.
Hope this helps you.
Hi, its too late to recommend. I agree with Dr Parimal. The synthesis of porous membrane entirely depends on the choice of your polymer. You may go for dry or wet casting or thermal inversion techniques which are very well known process. Based on the polymer, you have to select solvent and non solvent for dry and wet cast technique. You can tune the porosity as dense to asymmetric pore in the membrane. If you provide details of your system of interest, it may helps.
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