Abstract
Near-field electrospinning direct writing of array-nozzle is an efficient method for preparing large-area aligned fibers. However, electric field between the array-nozzle interferes with the stability and uniformity of near-field electrospinning, and little research has been done in this field. To clarify the electric field interference generated by array-nozzle, the experimental results compared with the simulation are discussed. In this work, electric field interference between the five-nozzle linear arrangement near-field electrospinning process was demonstrated by the initial ejection behavior, the electric field distribution of near-field electrospinning environment and the deposition spacing of fibers. In addition, we developed a simple and flexible method serving as a quantitative evaluation index for evaluating the degree of electric field interference. Then, the mapping effects of electric field interference of nozzle structure on the surface morphology and uniformity of aligned fibers were studied, including the number of nozzle, nozzle spacing and nozzle length with linear and toothed arrangement. According to the result of experiment and characterization, suitable arrayed nozzle parameters for stably direct-write aligned array pattern with near-field electrospinning were available, whose geometric parameters are linear two-nozzle with a nozzle spacing of 2 mm and a nozzle length of 6.35 mm. Finally, on the basis of our previous research, a microfluidic channel was successfully prepared on polydimethylsiloxane by two-nozzle cooperation, which verified the rationality of the geometry.
Highlights
Nowadays, the traditional single-nozzle electrohydrodynamic printing technology has been receiving extensive attention for its simplicity and high efficiency in preparing nanofibers, but its output is extremely low, which limits its industrialization
There is a quantitative analysis of the relationship between electric field interference (EFIF) and the prepared fiber structure,[4] this is not suitable for the conditions in near-field electrospinning (NFES)
The first method by observing the initial ejection sequence of linear five-nozzle NFES is shown in Figure 3(a) to (f)
Summary
The traditional single-nozzle electrohydrodynamic printing technology has been receiving extensive attention for its simplicity and high efficiency in preparing nanofibers, but its output is extremely low, which limits its industrialization. The most direct and effective method is to increase the number of jets in the process of electrospinning.[1,2] electric field interference (EFIF) between array-nozzle will directly affect its stability and uniformity.[3] In recent years, the prepared fiber films or the uniformity of the jets has been used to evaluate the rationality of the nozzle design. There is a quantitative analysis of the relationship between EFIF and the prepared fiber structure,[4] this is not suitable for the conditions in near-field electrospinning (NFES). How to suppress the NFES of multi-nozzle has become an issue that researchers have intensively studied.[5,6,7]
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