Dear Researchers,
I have tried electro-spinnning of PVDF powder using DMF and Acetone with small concentration of LiCl.
I used 20 -30 Kv and varied distances and flow-rates. However, I couldn't find any nanofiber.
Some paper suggested 14 wt% PVDF, 60 wt % DMF, 26wt % Acetone and 0.05 gm LiCl. However this resulted in low viscosity solution. Then I gradually added PDVF until I reached in a reasonable thickness. See attached image.
When I charged this solution in the electro-spinning at 30 Kv, the liquid front looked like the attached image.
Can any one suggest what might be issue behind this?
I appreciate your suggestions,
Thanks and Regards,
Rahman
Humidity is a very important condition in my experience. It is better to keep it at about 30%.
This is an important condition, but most papers was not mention it.
Dear Rahman
Have you tried to reduce the spinning orifice with a luer needle? From the picture it looks like your equipment allows for this.
In general you made the correct steps to obtain fibers. See also
http://electrospintech.com/espinflowchart.html and surrounding pages for more ideas.
Environmental conditions are crucial for reproducibility, fortunately PVDF can be spun at low and high humidities. In the publication below you can find some more parameters
DOI: 10.1021/acsbiomaterials.8b01108
Success and Regards Marc
Dear Rahman, this concentration (14 wt%) already is enough to obtain nice PVDF fiber by electrospinning. After see your picture, I imagine that you have to much polymer and the solvent evaporates to quickly.
I suggest you to change the PVDF by another one with higher molecular weight, also suggest to control the humidity, as Tzu-Lei Lu said.
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