Abstract
Numerous jets can be generated simultaneously on a nozzle by needleless melt electrospinning technology which has the advantages of solvent-free residues and environmental friendliness; and potential industrial application prospects. In this paper, the linear annular tip nozzle was taken as the research object, and the high-speed image acquisition of the jets generation and distribution process of annular tip nozzle was carried out and compared with that of straight-line tip nozzle. The results showed that the repulsive force between the jets caused a slight adjustment in the position of the jets on the free surface, the force between the jets on the annular closed curve canceled each other and eventually reached the equilibrium state, making the position of the jets stable and the distance between the jets the same, and the distance between the jets was related to the intensity of the induced electric field at the tip of the nozzle. Relevant conclusions can provide scientific and practical guidance for the design of needleless electrospinning nozzles on free surface in order to achieve uniform and efficient preparation of ultrafine fibers.
Highlights
Electrospinning, as a special preparation method of fibers, can prepare polymer fibers with diameters in the range of from nanometers to the submicron scale [1,2,3]
The needleless melt electrospinning with the slit head was carried out, in which the melt was distributed along a straight line at the slit and multiple polymeric jets were produced under high voltage electrostatic [15]
The relevant conclusions are as follows: 1. The experimental results showed that the development of the jets in needleless melt electrospinning with annular nozzle could be divided into three stages: random jet generation, jets gap filling and uniform distribution; 2
Summary
Electrospinning, as a special preparation method of fibers, can prepare polymer fibers with diameters in the range of from nanometers to the submicron scale [1,2,3]. The one-dimensional electro-hydrodynamic theory was established to predict the critical electric field intensity, and the mechanism of “fastest forming instability” was considered to be the cause of the self-organization of the system [20] This theory is not suitable for melt electrospinning and cannot explain the uniform distribution of jets in needleless melt electrospinning under closed linear free surface. In order to reveal the self-organization distribution mechanism of jets in needleless melt electrospinning using annular tip nozzle, a high-speed image acquisition experiment was carried out to study the formation and distribution process of jets under the annular nozzle, and the induced electric field intensity at the nozzle tip was simulated. The relevant analysis and conclusions could provide scientific guidance for industrialized equipment design of melt needleless electrospinning
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