Dear researchers,
I have a Polytetrafluoroethylene (PTFE) powder that the powders stuck together and created large particles (agglomeration).
I have been able to reduce the size of the polymer particles by using a steel sieve with a size of 90 microns.
In all the articles that use the combination of PVDF/PTFE polymers to increase hydrophobicity, only nanometer-sized particles have been used because at 100 degrees temperature, this polymer can only be dispersed.
In my experiments, the large particles would not be smaller even after 4 days of continuous mixing. These big powders cause defects in the membrane structure.
Is there a mill that can reduce the size of these particles to nanometers?
If yes, what is the model of this special mill?
Do you know another method?
Regards
It is possible that the powder could be deagglomerated by dispersing it ultrasonically in a solution with a surfactant. The surfactant should be a molecule with a hydrophobic end (preferably fluorinated) and a hydrophilic end. Physical methods like sieving or milling are not likely to work. Good luck
Dear Catherine Ellen Rice ,
Thank you so much for your reply and time.
I know the surfactants' group. But what is the best one for this work?
Does the surfactant cover the PTFE powder? Or this new material can be removed?
Could you explain more about how to do this experiment or can you introduce a website/article?
Thank you again for your help.
Regards
You will have to try several for your particular powder and fluid to see which works best. Sigma-Aldrich sells several types of Zonyl(TM) fluorosurfactants. Best wishes for success.
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