All ETDs from UAB

Advisory Committee Chair

Andrei Stanishevsky

Advisory Committee Members

Kannatassen Appavoo

Cheng-Chien Chen

Document Type

Thesis

Date of Award

2020

Degree Name by School

Master of Science (MS) College of Arts and Sciences

Abstract

This study focuses on crystallization and phase relations for various molar ratios of the free-surface alternating current electrospun nanofibrous composite material, Zirconium Titanate. Both ZrO2 and TiO2 based ceramic nanomaterials have been of increasing interest in recent years for applications in pollutants abatement, water splitting, optical and memory devices, humidity sensors, high temperature pigments, and biomaterials. The mixed TiO2-ZrO2 system is a semiconducting oxide and photoactive system that has shown very promising properties in these applications, depending on structure and phase composition. Molar ratios of TiO2/ZrO2 from 0.1:0.9 to 0.8:0.2 were tested in this study. The precursor based fibrous materials were fabricated at a rate that corresponded to a 2.4- 8.4 g/h yield of TiO2/ZrO2 ceramic nanofibers. All systems crystallized above 600°C and formed ceramic nanofibers with 250-350 nm mean fiber diameters and nanocrystalline structures which were stable up to 1200°C, depending on the composition. Stable zirconium titanate (srilankite) single phase nanofibers formed when the TiO2/ZrO2 molar ratio was between 0.5:0.5 and 0.6:0.4. The TiO2/ZrO2 compositions with up to 30 mol% were single phase tetragonal zirconia, stable up to 1000°C, whereas mixed srilankite/rutile nanofibers formed at 0.8:0.2 TiO2/ZrO2 molar ratio.

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