Holopainen Jani, Penttinen Toni, Santala Eero, Ritala Mikko
Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, PO Box 55, FI-00014, University of Helsinki, Finland.
Nanotechnology. 2015 Jan 16;26(2):025301. doi: 10.1088/0957-4484/26/2/025301. Epub 2014 Dec 16.
A needleless electrospinning setup named 'Needleless Twisted Wire Electrospinning' was developed. The polymer solution is electrospun from the surface of a twisted wire set to a high voltage and collected on a cylindrical collector around the wire. Multiple Taylor cones are simultaneously self-formed on the downward flowing solution. The system is robust and simple with no moving parts aside from the syringe pump used to transport the solution to the top of the wire. The structure and process parameters of the setup and the results on the preparation of polyvinyl pyrrolidone (PVP), hydroxyapatite (HA) and bioglass fibers with the setup are presented. PVP fiber sheets with areas of 40 × 120 cm(2) and masses up to 1.15 g were prepared. High production rates of 5.23 g h(-1) and 1.40 g h(-1) were achieved for PVP and HA respectively. The major limiting factor of the setup is drying of the polymer solution on the wire during the electrospinning process which will eventually force to interrupt the process for cleaning of the wire. Possible solutions to this problem and other ways to develop the setup are discussed. The presented system provides a simple way to increase the production rate and area of fiber sheet as compared with the conventional needle electrospinning.
一种名为“无针扭线静电纺丝”的无针静电纺丝装置被研发出来。聚合物溶液从一组被施加高电压的扭线表面进行静电纺丝，并收集在围绕该线的圆柱形收集器上。多个泰勒锥在向下流动的溶液上同时自行形成。该系统坚固且简单，除了用于将溶液输送到线顶部的注射泵外没有移动部件。介绍了该装置的结构和工艺参数，以及使用该装置制备聚乙烯吡咯烷酮（PVP）、羟基磷灰石（HA）和生物玻璃纤维的结果。制备出了面积为40×120平方厘米、质量高达1.15克的PVP纤维片。PVP和HA的生产率分别达到了5.23克/小时和1.40克/小时。该装置的主要限制因素是在静电纺丝过程中聚合物溶液在金属丝上干燥，这最终将迫使中断过程以清洁金属丝。讨论了该问题的可能解决方案以及改进该装置的其他方法。与传统的针式静电纺丝相比，所提出的系统提供了一种提高纤维片生产率和面积的简单方法。
