Highly aligned narrow diameter chitosan electrospun nanofibers

  • Sajjad Haider
  • Yousef Al-Zeghayer
  • Fekri A. Ahmed Ali
  • Adnan Haider
  • Asif Mahmood
  • Waheed A. Al-Masry
  • Muhammad Imran
  • Muhammad Omer Aijaz
Original Paper

Abstract

Random and highly aligned bead-free chitosan nanofibers (NFs) were successfully prepared via electrospinning by keeping the applied voltage (22 kV), flow rate (0.4 mL h−1), needle diameter (0.8 mm), and needle to collector distance (100 mm) constant while varying the solution concentration and collector rotation speed. No electrospinning was observed for lower solution concentrations, i.e., 1–3 wt% (w/v), whereas a decrease in the number and size of beads and microspheres, and bead-free NFs were obtained when the concentration of solution was increased from 4 to 6 wt%. Increase in the polymer concentration increased the solution viscosity (from 3.53 to 243 mPa s) and conductivity (from 29.80 to 192.00 μs cm−1) to critical values, which led to beadless NFs. The optimized conditions (i.e., concentration of solution 6 wt%, applied electrical potential 22 kV, flow rate 0.4 mL h−1, needle diameter 0.8 mm, and needle to collector distance 100 mm) were further used for the alignment of chitosan NFs. The alignment of the NFs increased from 35.6 to 94.4 % and the diameter decreased from 163.9 to 137.4 nm as the rotation speed of the cylindrical collector drum was increased from 2.09 to 21.98 m s−1. The aligned and small diameter chitosan NFs might find potential applications in biomedical, environmental, solar fuel cell applications, etc. Several target devices and polymer systems in the literature have been used to obtain aligned NFs; however, almost no work has been reported on individual chitosan alignment.

Keyword

Chitosan Aligned Nanofibers Fine diameter 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Sajjad Haider
    • 1
  • Yousef Al-Zeghayer
    • 2
  • Fekri A. Ahmed Ali
    • 1
  • Adnan Haider
    • 3
  • Asif Mahmood
    • 1
  • Waheed A. Al-Masry
    • 1
  • Muhammad Imran
    • 1
  • Muhammad Omer Aijaz
    • 1
  1. 1.Department of Chemical Engineering, College of EngineeringKing Saud UniversityRiyadhSaudi Arabia
  2. 2.Industrial Catalysis Research, College of EngineeringKing Saud UniversityRiyadhSaudi Arabia
  3. 3.Department of Polymer ScienceKyungpook National UniversityDaeguSouth Korea

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