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.
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