Preparation of Zirconia Nanofibers by Electrospinning and Calcination with Zirconium Acetylacetonate as Precursor

Abstract

For the first time, zirconia nanofibers with an average diameter of about 75 nm have been fabricated by calcination of electrospun zirconium acetylacetonate/polyacrylonitrile fibers in the range of 500–1100 °C. Composite and ceramic filaments have been characterized by scanning electron microscopy, thermogravimetric analysis, nitrogen adsorption analysis, energy-dispersive X-ray spectroscopy, and X-ray diffractometry. The stages of the transition of zirconium acetylacetonate to zirconia have been revealed. It has been found out that a rise in calcination temperature from 500 to 1100 °C induces transformation of mesoporous tetragonal zirconia nanofibers with a high specific surface area (102.3 m2/g) to non-porous monoclinic zirconia nanofibers of almost the same diameter with a low value of specific surface area (8.3 m2/g). The tetragonal zirconia nanofibers with high specific surface area prepared at 500 °C can be considered, for instance, as promising supports for heterogeneous catalysts, enhancing their activity.

Estudio piloto para la deposición de circona mediante plasma CVD

“…Puede verse de la Fig. 2 que alrededor de 185 °C se presenta un pico endotérmico que ha sido correlacionado con la primera etapa de descomposición del precursor, resultando en la formación de ZrO(CH3COO)2 (Rodaev et al, 2019). Alrededor de 415 °C se presenta un pico exotérmico muy intenso que indica la formación de oxi-carbonatos como compuestos intermedios (Mahfouz et al, 2013)…”

Morphology and Mechanical Properties of 3Y-TZP Nanofiber Mats

“…Contrary, the phase composition of undoped zirconia nanofibers dramatically depends on calcination temperature. In [28] it was revealed that a rise in calcination temperature led to the transformation of t-ZrO 2 nanofibers to m-ZrO 2 ones. It occurs if zirconia grain size exceeds 30 nm, which is critical for t-ZrO 2 retention at room temperature when the stabilizer is not used [29].…”

Three-Dimensional Zirconia-Based Scaffolds for Load-Bearing Bone-Regeneration Applications: Prospects and Challenges

“…Even though this study did not involve electrospun scaffolds, the embedding of 6(PA6)/HA is an innovative strategy that can be used in future research involving the fabrication of electrospun 6(PA6)/HA/zirconia scaffolds. Later, various researchers investigated different precursors and design strategies for fabricating flexible zirconia scaffolds via electrospinning [100][101][102]. Even though they successfully spun zirconia scaffolds and claimed that they are potentially suitable for bone-tissue engineering, there is a lack of in vitro and in vivo studies supporting these claims.…”