Affiliation:
1. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT) 1 , Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany
2. Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT) 2 , Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany
Abstract
Electrospinning is an important technique to fabricate nanofibers. In recent years, near-field electrospinning (NFES) has been developed to enhance the control of nanofiber deposition compared to conventional electrospinning, achieved by reducing the operating distance and electric field. This enables the construction of high-aspect ratio 3D structures in a self-aligned, layer-by-layer manner. However, the alignment of fiber deposition can be hindered by charge accumulation in the polymer fibers. Furthermore, a theoretical understanding of the underlying fiber deposition mechanism is still lacking. Herein, we present a numerical model for studying the charge transport, dissipation, and accumulation of NFES polymer fiber deposition. The model reveals that the presence of a trapped state in polymeric materials imposes limitations on the quality of charged fiber deposition. Moreover, the effect of different substrate materials on charge dissipation in fiber deposition is studied. To validate the model, we compare the simulation results with NFES experiments, demonstrating qualitative agreement. We also analyze the effect of the fiber materials and experimental parameters on the printing quality. This model provides an approach to analyze and optimize the operating parameters of NFES to achieve precise and stable nanofiber deposition.
Funder
Deutsche Forschungsgemeinschaft
Subject
General Physics and Astronomy
Cited by
1 articles.
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