Multigram preparation of tungsten microfibers via needle-less electrospinning of phosphotungstic acid

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Authors	KUNDRÁT Vojtěch VYKOUKAL Vít MORAVEC Zdeněk KRÁL Zdeněk MACHÁČ Petr ŠIMONÍKOVÁ Lucie PINKAS Jiří
Year of publication	2023
Type	Article in Periodical
Magazine / Source	International Journal of Refractory Metals and Hard Materials
MU Faculty or unit	Faculty of Science
Citation
Web	https://doi.org/10.1016/j.ijrmhm.2023.106121
Doi	http://dx.doi.org/10.1016/j.ijrmhm.2023.106121
Keywords	Electrospinning; Tungsten; Metal; Phosphotungstic acid; Tungstophosphoric acid; Polyvinyl alcohol; Microfibers
Description	Metallic tungsten microfibers were prepared in a multigram yield by electrospinning from the aqueous phosphotungstic acid/polyvinyl alcohol (PVA) solution in three steps. Green composite microfibers of H3PW12O40 /PVA were easily electrospun from precursor solutions on a Nanospider instrument with a cylindrical rotating electrode. Subsequent oxidation of the organic PVA matrix and decomposition of phosphotungstic acid in the air at 600°C provided ceramic WO3/P2O5 fibers. Finally, prepared oxide fibers were reduced in a forming gas atmosphere at temperatures up to 1000°C. During the reduction, all phosphorus was removed, and pure metallic tungsten microfibers were produced.
Related projects:	Basic and applied research and development of chemical and physicochemical analytical methods for the study of nature and advanced technology Molecules, complexes, macrocycles, and xerogels