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Materials 2013, 6(9), 4082-4095; doi:10.3390/ma6094082
Article

Aqueous ZrO2 and YSZ Colloidal Systems through Microwave Assisted Hydrothermal Synthesis

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Received: 9 July 2013 / Revised: 4 September 2013 / Accepted: 10 September 2013 / Published: 16 September 2013
Download PDF [697 KB, 17 September 2013; original version 16 September 2013]

Abstract

In this paper, the formation of ZrO2 and yttria-stabilised-zirconia (YSZ) aqueous colloidal systems via microwave assisted hydrothermal synthesis is studied. Microwave synthesis allows a fast screening of the influence of different parameters such as time and temperature. The temperature varied from 140 °C up to 180 °C and the used reaction time varied from 5 min up to 1 h. The synthesised zirconia nanoparticles have a particle size of 50 nm confirmed by TEM. A 1H NMR (nuclear magnetic resonance) study helped to understand the stabilization mechanism of the synthesised particles. By the addition of ytrrium ions into the zirconia colloidal solution, YSZ could be formed via an additional thermal treatment. Hereby, the samples are heated up to 400 °C for 1 h. YSZ colloidal solutions are synthesised by making use of complexing agents such as nitrilotriacetic acid, ethylenediaminetetraacetic acid and citric acid to control the hydrolysis and condensation of both ions to avoid non-stoichiometric phases. The ratio of Zr/Y in the particles is quantified by XRF. The amorphous structure of those particles necessitates an additional thermal treatment up to 600 °C during 1 h in order to obtain crystalline YSZ.
Keywords: microwave assisted synthesis; YSZ; zirconia; nanoparticles; NMR microwave assisted synthesis; YSZ; zirconia; nanoparticles; NMR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Vernieuwe, K.; Lommens, P.; Martins, J.C.; Van Den Broeck, F.; Van Driessche, I.; De Buysser, K. Aqueous ZrO2 and YSZ Colloidal Systems through Microwave Assisted Hydrothermal Synthesis. Materials 2013, 6, 4082-4095.

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