Accuracy Improvement of Nano-fiber Deposition by Near-Field Electrospinning

Electrohydrodynamic (EHD) principles have long been applied in the manufacture of sub-micron structures. One example is the far field electrospinning (FFES) process dating back to the 1930s 1-3 for making fine textile fibers. In this process a high voltage (in the kV range) is applied between a spinneret and a collector for pulling continuous polymer fibers from a solution or melt. FFES can generate nanoscale polymer fibers but lacks the control over registry or alignment due to: (1) bending instability, (2) splitting of the fibers during elongation due to electrostatic repulsion between charged segments, and (3) fiber buckling upon landing on the collector due to electrostatic repulsion between the already deposited segments and incoming segments 4, 5 (Fig. 1). At the beginning stage when the bending perturbations are negligible, the liquid jet is straight. 6 This portion of the jet has been recently utilized to deposit highly aligned fibers in the so-called near-field electrospinning (NFES) process. 7 Fig. 1 Schematic illustration of (a) far-field electrospinning and (b) near-field electrowriting processes, which produce (c) random and (d) aligned nanofibers, respectively. Accuracy Improvement of Nano-fiber Deposition by Near-Field Electrospinning

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