4.6 Article

Hollow-Fiber Melt Electrowriting Using a 3D-Printed Coaxial Nozzle

期刊

ADVANCED ENGINEERING MATERIALS
卷 24, 期 1, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202100750

关键词

additive manufacturing; electrohydrodynamics; thermoplastics

资金

  1. EACEA Biofabrication Degree [2013/3137 001-001]
  2. PROMOS/DAAD
  3. Deutsche Forschungsgemeinschaft within the DFG State Major Instrumentation Programme [INST 105022/58-1 FUGG]
  4. Australian Research Council through the ARC Centre of Excellence for Electromaterials Science [CE140100012]
  5. Volkswagen Foundation [93418]

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A 3D-printed nozzle is introduced for the single-step fabrication of melt electrowritten hollow fibers, utilizing SLM and conventional nozzles to create small diameter hollow fibers efficiently.
Herein, a 3D-printed nozzle designed for the single-step fabrication of melt electrowritten hollow fibers is introduced. To achieve this, selective laser melting (SLM) is used to fabricate the outer part of the coaxial nozzle (800 mu m inner diameter) from Ti6Al4V, into which a conventional nozzle (250 mu m inner diameter) is inserted. Several iterations of coaxial nozzle design result in a well-aligned inner core nozzle that delivers air into the Taylor cone of medical-grade poly(epsilon-caprolactone) (PCL). Air from this bubble forms the hollow part of the fiber while the PCL shell solidifies as the shell. The smallest PCL fibers have an approximate outside diameter of 10 mu m and a lumen of 6 mu m, making this a promising one-step technique for small diameter hollow fiber fabrication.

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