Dear Saket Phadkule

You can take out the foil out of the collector just after the collection of NFs material on the collector. But in some cases if the temperature conditions are not given and the collected mesh is somewhat not pure solidified you have to process it through some temp. Condition or leave it in room temperature unless it gets solidified.

Here is a recent paper of mine in which i have fabricated electrospun nfs at room temperature and the whole process have been given over there. i hope it would help you

Article Electrospun PVP/TiO2 Nanofibers for Filtration and Possible ...

almost After 2 hour you can removed your nanofiber from foil, it's better if you dry at room temperature for 24 hour in which your all solvent will be evaporate..

Give it about 30 minutes, this is the optimum time: It works for 20Kv, 1.2ml/hr and a moderate viscosity.

I did it various times and to be honest, it is not important how much the nanofibers remain on the mandrel.

On the other hand, the minimum time for removing fibers from the drum depends on the electrospinning's time.

(i.e., the more time spent on electrospinning, the more time spent for remaining the nanofibers on the drum)

You can read the below link for more information:

Article Fabrication and characterization of a novel hydrophobic poly...

Hi Saket Phadkule

There is no problem in taking out the Al foil just after finishing the electrospinning ,Sometimes it is recommendable to leave it for at least one hour when you have mixed some metal ions with polymer otherwise if your electrospinning process is done smoothly and fiber deposited well ,then it will be in dry form already ,you can take it out and peel it off the Al foil.

I hope it will help.

Dear Saket Phadkule ,

in most cases it doesn`t matter how long you wait, if the ES conditions for the particular solvent-polymer system are optimized carefully. The most important is what kind of polymer you used and what particular solvent.

If the solvent is volatile enough, or the distance between the fiber generator and the collector is long enough, so the solvent have time to fully evaporate during the fibers formation and further travel to the collector, - the formed fibers will be collected already dry. It works for all the types of the electrospinning designs and collectors. But still depends on the particular system solvent-polymer.

In other words - if you optimize the ES process to obtain already dry fibers (it can be detected if you don`t see any changes in the macroscopic morphology of the fibrous mat), you can remove them right after the ES process.

Also keep in mind, that ES of hygroscopic polymers may be tricky due to the possible damaging of the formed fibrous mats by the air moisture or even by the moisture of the skin (if manipulating with bare hands).

Feel free to check this review for some details:

https://www.sciencedirect.com/science/article/abs/pii/S2468519421001233

Kind regards,

Ivan