Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : nanofibers

Effects of Ambient Temperature and Needle to Collector Distance on PVA Nanofibers Diameter Obtained From Electrospinning Technique

A.R. Jabur; L.K. Abbas; S.M. Muhi Aldain

Engineering and Technology Journal, 2017, Volume 35, Issue 4, Pages 340-347

Electro spinning is regarded as an active technique for producing biomimetic scaffolds used in tissue engineering applications from synthetic and natural polymers. The technique used in this research gives the ability to produce bio-polymeric materials for fabricating engineered scaffold tissues by preparing (PVA) solution. Ambient temperature at (25, 30, 35, 40, 45 and 50 °C) and needle tip to collector distance with (4, 8, 12, 15, 20 and 22 cm) were studied to optimize the electrospun fibers (size and shape). The electrospun fibers topography were studied by scanning electron microscopy (SEM). Measurements were done for each (SEM) images and lead to determine the mean diameters size of the obtained fibers. Results showed that the average fiber diameter of the (PVA) electrospun decreased to the range (220–500 nm) without creation of any beads, fibers diameter decreased as ambient temperature increase to certain temperature at (45 °C) and retrain to increase at (50 °C) temperature, while increasing the distance of the needle tip to collector decrease the mean nanofiber diameter from (875 nm) at (4 cm) to (600 nm) at (22 cm).

Effect of Flow Rate on Characterizations of TiO2 Nano fibers using Electro spinning Method

Muhsin A. Kudhier; Raad S. Sabry; Yousif K. Al-Haidarie

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 1599-1607

TiO2nanofibers with anatase structure were synthesized by anelectrospinning method. X-ray diffraction measurements showed that TiO2 nanofibers were polycrystalline with anatase phase.The effects of flow rate parameter on TiO2 nanofibers were examined using atomic force microscopy, field emission scanning electron microscopy. The energy gap was estimated and optical behavior was studied using UV-Vis spectroscopy, and Photoluminescence spectroscopy. It was noted that the average diameter of these nanofibersincreases from (82-320) nm with increasing theflow rate from (1- 10ml/h) respectively. The length of the nanofibers reached to several microns.