I fabricated a coaxial needle with gauge 22 and gauge 16 and tried to make hollow nanofibers from PAN solution in DMac (10%) using mineral oil as sheath fluid.
However, when I manipulated the flow, distance and voltage, instead of making a jet, small drops were ejected from the tip of needle and I could not adjust it to obtain a taylor cone. I know that it is due to high surface tension of big drops. But I have no choice of smaller needle.
Is there any idea how to overcome this problem?
Dear Mehrdad
It should help to increase the concentration to stabilize spinning with a bigger nozzle. Other options are to decrease the tension by adding solvents with a lower tension like Ethanol. If allowed, surfactants (Tween) can also help.
Personally I don't think your coax is too big. Its on the bigger side, but see it positive, much easier to clean.
Good luck
Marc
Is it possible for you to vary the temperature of your solution a bit and see the behaviour of the Stream.
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