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Stretch-and-fold method for micro/nano fibers fabrication and mathematical analysis of instability
Thesis   Open access

Stretch-and-fold method for micro/nano fibers fabrication and mathematical analysis of instability

Lanziye He
Master of Science (M.S.), Drexel University
Jun 2018
DOI:
https://doi.org/10.17918/jec0-bz35
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Abstract

Unsteady flow (Fluid dynamics) Biomedical Materials Fluid Mechanics Mechanical Engineering Nanostructured Materials Tissue Engineering
The success of the stretch-and-fold method illustrates a more efficient and productive method to manufacture micro/nano-fibers. In the manufacturing process, the theory of Rayleigh-Plateau Instability predicts that surface tension between core and clad interface will overcome the viscosity of the core/clad liquids. This leads to the break of the core into segments. By using a thermoplastic clad (Polycaprolactone, PCL), the dissociation motion of the core's fluid was delayed due to the high viscosity of the melted clad and was finally arrested by to the solidification of the clad at the room temperature. Meanwhile, operating temperature and stretch-and-fold cycle speed are also important factors in the fabrication. To explore the relationship among all these operational factors, experiments were conducted by producing 15/20/25 folds fibers. The manual stretch-and-fold process, weight ratio calculation, scanning electron microscope imaging, and mathematical model approach were the main tasks performed during the entire experiment. Finally, an analysis based on the collected data and mathematical approximation. A prediction is made between stability and related experimental factors.

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