Dear Foroogh,

though you did not mentionned the solvent, if it is possible you can take off air from solution by freeze-thaw cycling. Regards

Dear Abdelkader,

The solvent is DMAc. The freezing method is impossible for this work. Thanks for your answer.

Regrads

What about using a centrifuge ? I'm sure you have plenty of these in Iran ;) The bubbles will be more bouyant at higher G-force.

Hello Peter,

Thanks for your comment. I think its not the special method that membrane manufacturers use for degassing, but I test it. Actually I probe for the method that membrane companies use.

Regards

Dear all,

I found that ultrasound is also uded for deagasing if this does not interfere with the stability of you system. Have you tried simple purging with nitrogen or argon. Regards

Hi Abdelkader,

Thanks for following this question. The ultrasonic method is not useful. But I could not understand about N2 or Ar. How can I use them. Can you explain please?

Dear Foroogh,

purging with Nitrogen or argon is a commun practice in radical polymerization and reactions. It consists on passing a flow of one of these gases through the solution with the help of a needle. Better results may be obtained if this operation is assisted with vacuum, for exemple using a schlank setup. Regards

This attached file gives a brief review on oxygen elimination techniques. To clarify, this techniques are based on reducing the relative solubility of gases using inert gases. Regards