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首页> 外文期刊>Advanced Functional Materials >Stabilization of Isolated Hydrous Amorphous and Tetragonal Zirconia Nanoparticles Through the Formation of a Passivating Alumina Shell
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Stabilization of Isolated Hydrous Amorphous and Tetragonal Zirconia Nanoparticles Through the Formation of a Passivating Alumina Shell

机译：通过形成钝化氧化铝壳来稳定分离的含水非晶态和四方氧化锆纳米粒子

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摘要

In this work, we explore the high-temperature phase stability of isolated, alumina-coated zironia nanocrystals with a goal of understanding how interfacial energy affects phase stability. Isolated tetragonal and hydrous amorphous zirconia colloids were synthesized and coated with alumina through the hydrolysis of aluminum isopropoxide. Alumina-coated samples exhibited phase behavior that was markedly different from that of the uncoated analogs. Uncoated tetragonal particles transformed to the monoclinic phase at 1100 ℃ while alumina-coated tetragonal particles did not transform until 1400 ℃. Uncoated hydrous amorphous particles crystallized to the tetragonal phase after heating at 600 ℃ and transformed to the monoclinic phase after heating at 800 ℃. Alumina-coated hydrous amorphous particles crystallized only after heating at 1050 ℃, and transformed to the monoclinic phase after heating at 1400 ℃. Differences in phase behavior are postulated to depend on the zirconia-alumina interface, which must be disrupted before zirconia particles can fuse and facilitate the tetragonal-to-monoclinic phase transition. By coating the nanocrystals with a thin alumina shell and studying the resultant phase stability, we explore the effect of reproducibly modified interfacial chemistry on phase behavior in nanoscale ceramic composites.
机译：在这项工作中，我们探索了隔离的氧化铝包覆的氧化锆纳米晶体的高温相稳定性，旨在了解界面能如何影响相稳定性。合成了分离的四方和含水的无定形氧化锆胶体，并通过异丙醇铝的水解用氧化铝涂覆。氧化铝涂层的样品表现出与未涂层的类似物明显不同的相态。未涂覆的四方颗粒在1100℃转变为单斜晶相，而氧化铝涂覆的四方颗粒直到1400℃才转变。在600℃加热后，未包覆的含水无定形颗粒结晶为四方相，在800℃加热后转变为单斜相。氧化铝包覆的含水无定形颗粒仅在1050℃加热后结晶，而在1400℃加热后转变为单斜晶相。假定相行为的差异取决于氧化锆-氧化铝界面，在氧化锆颗粒可以融合并促进四方-单斜相转变之前，必须先将其破坏。通过用薄的氧化铝壳涂覆纳米晶体并研究所得的相稳定性，我们探索了可再现地改性的界面化学对纳米级陶瓷复合材料中相行为的影响。

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