Diversified Morphology of Electrospun Fibers through Self-Assembly of the Strings in the Jet Developed by Flow-Induced Phase Separation
Yong-Wen Cheng, Shu-Ya Kao, Hsuan-Sheng Lin, Meng-Tzu Tsai, Hsin-Yi Lai, Pin-Hsien Lu, Chi Wang
TL;DR
This paper explains how electrospun fibers can form various shapes like ribbons and beads due to phase separation in the jet.
Contribution
The study reveals flow-induced phase separation as a unifying mechanism for diverse electrospun fiber morphologies.
Findings
Phase separation in the jet leads to hierarchical string structures in electrospun fibers.
Lateral association of these strings creates different fiber features like beads and barbs.
The mechanism applies to multiple polymers, unifying the understanding of fiber morphology.
Abstract
Solution electrospinning produces not only round fibers but also many unexpected features, e.g., ribbons, nets, and fibers with beads, barbs, or branches along the fiber length. These diversified features are observed in the electrospun fibers of poly(vinyl alcohol), Nylon-6, poly(N-isopropylacrylamide), ultrahigh-molecular-weight polystyrene, and ultrahigh-molecular-weight polyethylene in this study. All these unique features could be realized through our recent discoveries that flow-induced phase separation occurs in the jet to develop polymer-rich phases of hierarchical string structures with various diameters. Subsequently, lateral association (or fasciation) of the hierarchical strings ensues and creates assembled strings of different kinds, which are split from the phase-separated jet and evolve into as-spun features after solvent evaporation. Our results indicate that…
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Taxonomy
TopicsElectrospun Nanofibers in Biomedical Applications · Surface Modification and Superhydrophobicity · Electrohydrodynamics and Fluid Dynamics