In electrospinning process nanostructured solid fibres are produced from charged polymer jet oriented at external electrostatic field. Materials such as polymer, composites and tissue scaffold fibres have been fabricated with electrospinning techniques. The typical obstacle of electrospun fibre production is the whipping instability, resulting from the chaotic oscillation of polymer jet. In this Letter, feasibility of suppressing the whipping instability is analysed and explained using a mathematical model based on the usage of secondary electrostatic field created by finite length hollow cylinder. It is shown that the three-dimensional path of polymer jet calculated by computer simulations focus the characteristic spot size of the deposited electrospun fibre to a smaller diameter, which is coherent to the experimental observations
In the electrospinning process, unstructured nanofiber mats are produced by oriented fluid jets with an external electrostatic field. Electrospun fibers have wide applications for the fabrication of composite materials, tissue scaffold, and membranes. However, electrospun fiber production systems have many problems, e.g., the bending instability due to the complicated oscillations of polymer jet. In this research, parallel plate and hollow cylindrical conducting electrodes are implemented through the jet trajectory in order to investigate the possibility of controlled deposition of polymer fibers. Parallel electrodes with proper driving sources can generate the steering field for the nanofiber formation at the collector plate based on analog addressing electronics. It was shown that the modulated electric field applied through the parallel plate electrodes notably increased the deposition of the electrospun polymer fibers in a controlled fashion at the collector, which is coherent to the computer simulations. Furthermore, the finite-length hollow cylinder dampened the bending instabilities of the polymer jet which decreases the characteristic spot size of the deposited electrospun fiber to a smaller diameter.
Özetçe Doku mühendisliği gibi birçok uygulama alanında nano boyutlu polimerik liflerin üretimi için çeşitli teknikler araştırılmaktadır. Elektrostatik eğirme yöntemi bunların içinde en yaygın ve en etkin olanıdır. Polimer, kompozit ve metal nanolif gibi çok çeşitli malzemeler bu yöntemle işlenebilmektedir. Üretimin eniyileştirilmesi için birçok parametrenin, çeşitli işleme aşamalarında detaylı olarak incelenmesi gerekmektedir. Elektrik alan ve polimer çözeltisinin özelliklerin seçilmesi en önemli tasarım ölçütleridir. Önerilen deney düzeneği, frekansı ve genliği ayarlanabilen yeni tasarlanmış yüksek gerilim güç kaynağı ile esneklik kazanmıştır.
AbstractVarious methods for fabricating nanoscale polymeric fibers are investigated at large, e.g. tissue engineering . Electrospinning is the most versatile process among them. Materials such as polymer, composites and metal nanofibres have been fabricated with electrospinning techniques. It is important that many parameters and post, pre-processes should be investigated thoroughly to be able to optimize the method. Characteristics of the electrostatic field, and polymer solution constitute the main design criteria. The proposed experimental setup has been implemented with newly designed high voltage power suply which can be adjusted resiliently in frequency and power amplitude.
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