Aligned electrospinning nanofibers by a cubic drum collector
Date Issued
2011
Date
2011
Author(s)
Li, Zhi-Wen
Abstract
Nanofibers are the most fascinating materials, playing an important role in nanotechnology. Electrospinning is a useful technique to generate continuous polymer fibers, which range from micrometers to a few nanometers of its diameters. The main advantages of electrospinning are simply apparatus, easily operating and relatively low cost. In addition, it can produce uniform and continuous nanofibers.
This study aims to use a cubic drum collector to replace tranditional methods. Adopting drum collectors help continuously collect aligned nanofibers, and then aligned nanofibers are rearranged in the form of Layer-by-Layer stacked films. From the way indicated above, the expectation is that different stacked layer fibers piles with an angle of 90 degree between each layer. As a result, a nanofibers film of cross shape will be obtained.
The results show that the collection distance is of crucial importance to the performance of the aligned fibers since it affects the instability of liquid jet. At the same electrical potential imposed a shorter collection distance is associated with a stronger electric field, which thus suppresses the whipping motion. However , if the collection distance is too short, the solvent of polymer is difficultly evaporated, causing a sticky morphology of fibers. Therefore, experimental parameters must be appropriately chosen in order to obtain perfect aligned nanofibers. The present results show that the diameters of good aligned nanofibers range between 400 to 800 nanometers. An additional controlling methed is thus needed for further improving the performance.
Subjects
Nanofibers
Electrospinning
Polymer
Type
thesis
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