Structure and mechanical properties of nanofibrous ZrO2 derived from alternating field electrospun precursors

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dc.contributor.authorStanishevsky, Andrei
dc.contributor.authorYager, Riley
dc.contributor.authorTomaszewska, Jolanta
dc.contributor.authorBinczarski, Michał
dc.contributor.authorManiukiewicz, Waldemar
dc.contributor.authorWitońska, Izabela
dc.contributor.authorLukáš, David
dc.date.accessioned2019-08-23T06:30:13Z
dc.date.available2019-08-23T06:30:13Z
dc.date.issued2019
dc.description.abstractNanofibrous zirconia (ZrO2) meshes were prepared from precursor fibers which were synthesized using the method of free-surface, high-yield alternating field electrospinning (AFES). The weight ratio of zirconyl chloride salt to polyvinylpyrrolidone (PVP) polymer in liquid precursors was investigated for its effect on the spinnability and formation of precursor fibers as well as on the resulting fibrous ZrO2. The precursor fiber generation measured at a rate up to 5.6 g/h was achieved with a single flat 25-mm diameter alternating current (AC) electrode, which corresponded to production of up to 1.5 g/h of fibrous ZrO2. The calcination process involved annealing the fibers at temperatures which ranged from 600 °C to 1000 °C and produced 0.1–0.2 mm thick fibrous ZrO2 meshes. Individual nanofibers were found to have diameters between 50 and 350 nm and either a tetragonal (t-ZrO2) or monoclinic (t-ZrO2) structure depending on the calcination temperature. The annealed meshes with total porosity between 98.0 ± 0.2% and 94.6 ± 0.2% showed little deformation or cracking. Tensile strength and modulus of fibrous t-ZrO2 meshes strongly depended on porosity and varied from 0.07 ± 0.03 MPa to 1.05 ± 0.3 MPa and from 90 ± 40 MPa to 388 ± 20 MPa, respectively. The m-ZrO2 meshes resulted similar moduli, but much lower strengths due to their brittleness. A power-law relationship between the elastic modulus and porosity of AFES-derived nanofibrous t-ZrO2 meshes, in comparison with other porous zirconia materials, was also investigated. The results of this study have demonstrated the feasibility of free-surface AFES in sizeable production of zirconia nanofibers and highly porous nanofibrous ceramic structures.cs
dc.format.extent11 strancs
dc.identifier.doi10.1016/j.ceramint.2019.06.092
dc.identifier.urihttps://dspace.tul.cz/handle/15240/153233
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0272884219315883
dc.language.isocscs
dc.relation.ispartofCeramics International
dc.subjectElectrospinningcs
dc.subjectZrO2cs
dc.subjectMechanical propertiescs
dc.subjectFibrescs
dc.titleStructure and mechanical properties of nanofibrous ZrO2 derived from alternating field electrospun precursorscs
local.citation.epage18682
local.citation.spage18672
local.relation.issue15
local.relation.volume45
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