try vacuum environment after casting the film on petri dish.

Thanks.

There are volatiles in my film, which might be lost due to vacuum. I tried sonication also, but it did not work well.

Dear Ashish,

ya) ou may work at elevated temperatures to have lower viscosity. The bubbles will go off easier. Perhaps in combination with sonication as you have already tried.

But I must admit that part of volatiles may also escape.

b) If the bubbles are due to the volatiles you should work at lower temperatures. So the volatiles may not go off by bubbles. Please try to use a cold petri dish. So you may might avoiding the creation of bubbles at all.

c) You may share on which material you deal with.

Good afternoon sir

If they are generated during mixing of two components, you may choose to use low speed mixing that may not entrain any air.