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Electrospun Nanofbers have unique properties such as high porosity, large specific surface area, and significant scale and surface effects. These properties make Electrospun Nanofbers highly desirable for various applications such as biomedicine, energy storage, sensors, environmental remediation, and personal protection. The increasing demand for high quality Electrospun Nanofbers in various industries emphasizes the need for improved spinning technology.
The main point of this paper
Overview of electrospinning technology:
Electrospinning is a highly efficient technique for producing nanofibers by deforming and stretching polymer solution droplets into fibers by means of a high-voltage DC electric field.
The technology is considered the most industrially viable method for manufacturing polymer nanofibers due to its simplicity, broad applicability, and low cost of operation.
Limitations of conventional electrospinning technology:
Single needle electrospinning has low productivity (0.01-0.1 g/h).
Multi-needle electrospinning suffers from difficulty in cleaning the spinning needles, clogging and electric field interference.
Advantages of needleless electrospinning:
Solves clogging problems and increases fiber productivity.
Including bubble electrospinning, conical wire electrospinning, multi-parallel electrode electrospinning and arc convex groove electrospinning.
Challenges of needleless electrospinning:
High spinning voltage (>30 kV) is required.
Fiber uniformity and quality need to be further improved.
Innovations in standing wave electrospinning devices:
Enhanced Taylor Cone formation using chordal standing wave vibrations to lower the spinning threshold voltage to 18 kV.
Nanofibers with a diameter of 173 ± 48 nm were successfully fabricated.
Development of a multi-string standing wave electrospinning device:
The string spacing, number and phase difference were optimized by installing a string array build.
The effect of these parameters on the electric field distribution in the spinning region was investigated using electric field simulations.
Research objectives and results:
A new solution for large-scale production of high-quality fibers was proposed.
It provides a reference for optimizing the wire electrospinning process.
Development of a multi-string standing wave electrospinning device:
In order to increase the electrospinning yield, a multi-string standing wave electrospinning device was developed to enhance the spinning capacity by incorporating string arrays.
Process parameter optimization:
Researchers optimized process parameters such as string spacing, number and phase difference, and analyzed their effects on the electric field distribution in the electrospinning region through electric field simulations.
Electric field interference issues:
When the string spacing was less than 40 mm or the number of strings was more than two, the electric field strength decreased significantly due to electric field interference.
Mitigation of electric field interference by phase difference:
E-field interference can be effectively mitigated by setting the string standing wave phase difference to half a cycle.
Optimal string array parameters:
The optimum string array parameters are: string spacing of 40 mm, two strings, and a phase difference of half a cycle.
Electrospun Nanofbers diameter and yield:
Multi-string standing wave electrospinning produced fiber diameters similar to those produced by single-string standing wave electrospinning (178 ± 72 nm vs. 173 ± 48 nm), but with an 88.7% increase in yield to 2.17 g/h.
Potential for large-scale production:
This work demonstrates the potential for large-scale production of nanofibers and further refines the standing wave electrospinning process
In this study, a multi-string standing wave electrospinning device was constructed by installing a string array in the standing wave electrospinning device. The process parameters such as string spacing, number and phase difference were optimized by electric field simulation, and their effects on the electric field distribution in the spinning region were investigated. The electric field interference between strings can be effectively eliminated when the string spacing is more than 40 mm, the number of strings is less than three, or the phase difference of the strings standing wave is set to half cycle. The optimum string array parameters determined were: string spacing of 40 mm, two strings, and a phase difference of half a cycle. The spinning diameter of the multi-string standing wave electrospinning was 178 ± 72 nm, which is similar to that of the single-string standing wave electrospinning (173 ± 48 nm). Nevertheless, it increased the fiber yield by 88.7% to 2.17 g/h, thus demonstrating the potential for large-scale production of nanofibers. This work further refines the standing wave electrospinning process and provides a reference for optimizing the wire electrospinning process.
