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Optimum sol viscosity for stable electrospinning of silica nanofibres

Tijdschriftbijdrage - Tijdschriftartikel

Silica nanofibres have, due to their excellent properties, promising characteristics for multiple applications such as filtration, composites, catalysis, etc. Silica nanofibres can be obtained by combining electrospinning and the solU+2013gel process. To produce silica nanofibres most of the time organic solutions are applied containing a carrying polymer, which is afterwards removed by a thermal treatment to form pure ceramic nanofibres. Although electrospinning of the pure silica precursors without carrying polymer is preferred, the parameters influencing the stability of the electrospinning process are however largely unknown. In addition, this knowledge is essential for potential upscaling of the process. In this study, the optimum viscosity to electrospin in a stable manner is determined and the way to obtain this viscosity is evaluated. Sols with a viscosity between 120 and 200 mPa.s could be electrospun in a stable way, resulting in uniform and beadless nanofibres. Furthermore, this viscosity region corresponded with nanofibres having the lowest mean nanofibre diameters. Electrospinning with diluted sols was possible as well, but electrospinning of the fresh sols was more stable. These results illustrate the importance of the viscosity and degree of crosslinking of the sol for the stable electrospinning of silica nanofibres and demonstrate that upscaling of the electrospinning process of silica nanofibres is feasible
Tijdschrift: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
ISSN: 0928-0707
Issue: 1
Volume: 67
Pagina's: 188 - 195
BOF-keylabel:ja
IOF-keylabel:ja
BOF-publication weight:0.1
CSS-citation score:1
Auteurs:National
Authors from:Higher Education
Toegankelijkheid:Open