Nanotech 2011

Fabrication chitosan nano fibers membrane via electrospinning

S. Haider, W.A. Al-Masry, Y. Al-Zeghayer, M. Al-Hoshan, F.A. Ahmed Ali
King Saud University, SA

Keywords: chitonsan, electrospinning, nanofiber membrane

Abstract:

Chitosan nanofibers were prepared via electrospinning by varying solution concentration (1, 2, 4 and 6wt %), applied voltage (14, 18 and 22 kV), distance between needle and collector (100 mm and 140 mm), needle diameter (0.2 mm and 0.8mm) and flow rate (0.4mL/h and 0.8mL/h). No electrospinning was observed for 1-3 wt% samples, where as improved physical texture, decrease in the number and size of the beads and microspheres sand beads free nanofibers were obtained when the concentration of solution was changed from 4 to 6 wt%, and applied voltage, flow rate and needle diameter from 14 kV, 0.4 mL/h, 0.2 mm to 22 kV, 0.8 mL/h and 0.8 mm, respectively. Increase in the polymer concentration has increased the viscosity of the solution to a critical value, higher voltage overcame the surface tension of the polymer solution, changes in the flow rate increase the flow rate above the threshold and change in needle made the of needle diameter large enough to avoid evaporation of the solvent at the needle tip and blocking of the needle tip, and thus has allowed the formation of jet. Flow rate and needle diameter effect was only observed 4wt%, in both cases the number and size of bead decreased
 

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