Needleless electrospinning with linear spinnerets

Jahan, I 2019, Needleless electrospinning with linear spinnerets, Masters by Research, Fashion and Textiles, RMIT University.

Document type: Thesis
Collection: Theses

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Title Needleless electrospinning with linear spinnerets
Author(s) Jahan, I
Year 2019
Abstract Electrospinning is the most effective method to produce nanofibres for various applications. The conventional electrospinning technique uses a single needle or multi-needle to produce nanofibres with limited throughput and hassles in controlling and operating. Different methods of needleless electrospinning, such as rotating cylinder, spiral coil, wire, ring, disc, dish and slot, have been established to scale up the production rate of nanofibres. However, stable and trustable, effective needleless electrospinning with the controllable capability to produce high-quality nanofibres is still of great challenge. The aim of this study is to establish new methods of electrospinning from linear spinnerets with lower electricity consumption and higher effectiveness than conventional needle electrospinning.

A literature review was conducted to understand the evolvement of spinneret in electrospinning. As a linear spinneret, a convex needle with a split in its tip was demonstrated to generate multiple polymer jets from a limited free surface in needle-based electrospinning. Another novel spinneret from a single wire loop embedded in a tube was then used as the spinneret for needleless electrospinning with precise controlling. The controllability and efficiency of both spinnerets were compared with needle electrospinning. Furthermore, the linear spinneret from a spiral wire entrenched in a tube was used to perform nanofibrous coating on textiles.

Compared to needle electrospinning, electrospinning from a convex needle showed 2-3 times higher flow rate with multiple jet and finer nanofibres under an applied voltage of 19 kV. Besides, the wire loop spinneret generated multiple jets with a larger spinnable area due to its special geometrical structure under a high applied voltage of 28 kV. The resultant nanofibres from this spinneret were slightly coarser compared to the needle electrospinning. Nevertheless, it has achieved a higher production rate of 0.48 g/h than needle electrospinning. Both convex needle and wire loop spinnerets generated a stronger electric field compared to needle as per the electric field modelling. The linear spinneret was demonstrated to generate nanofibrous coating on cotton fabrics, and the coated PVA nanofibrous membrane showed versatile protection with comfort after a dip coating of polydimethylsiloxane-trimethylated silica (PDMS-TMS).

The linear spinnerets can be adopted to produce nanofibres with high throughput and controllability. The limited free surface in the spinneret tip allows the generation of strong electric field intensity under a low applied voltage (19-28 kV) with little solvent evaporation. Additionally, the linear spinnerets are also efficient in preforming nanofibrous coating. Overall, the linear spinnerets are stable, effective, and capable of fabricating high quality nanofibres for various practical implications.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Fashion and Textiles
Subjects Textile and Fashion Design
Keyword(s) Electrospinning
Modelling work
Production rate
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Created: Thu, 30 May 2019, 10:40:41 EST by Adam Rivett
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