Nanopowders of pure zirconia have been synthesized using citric acid (CA)‐assisted lamellar liquid crystal template method. The microstructure of the zirconia powder prepared at the different mole ratios of CA to zirconium oxynitrate (ZN) was characterized by FT‐IR, X‐ray diffraction (XRD), laser particle size analyzer, Raman spectroscopy, and scanning electron microscope (SEM) methods. The phase structure of the sodium dodecyl sulfate (SDS)/C₁₀H₂₁OH/H₂O system before and after adding mixing solution CA and ZN was determined by POM (Polarizing Optical Microscope). The results show that lamellar structure of the SDS/C₁₀H₂₁OH/H₂O system after adding mixing solution CA and ZN is stable. The presence of CA inhibits agglomeration and growth of zirconia particle. The crystallite size of zirconia powders decreases and agglomerates lowly with addition of CA. Fourier transform infrared spectrometry (FI‐IR) analyses reveal that the structure of chelating organic complex is maintained in zirconia structure at high‐temperature calcination to cause oxygen vacancies which stabilizes the tetragonal phase of zirconia. The zirconia powders remained the single metastable tetragonal phase at the molar ratios of CA to ZN ranging from 1:3 to 5:1. The crystallite size of zirconia with spherical morphology varied from 32.2 to 20.1 nm with the increase of the molar ratio of CA to ZN in the range of 1:3 to 5:1.

中文翻译：

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具有四方相的纯单分散氧化锆纳米粉的可控合成

使用柠檬酸（CA）辅助层状液晶模板方法合成了纯氧化锆纳米粉。通过FT-IR，X射线衍射（XRD），激光粒度分析仪，拉曼光谱和扫描电子显微镜（SEM）对以CA与硝酸氧锆（ZN）不同摩尔比制备的氧化锆粉末的微观结构进行了表征方法。十二烷基硫酸钠（SDS）/ C ₁₀ H ₂₁ OH / H ₂ O系统在添加混合溶液CA和ZN之前和之后的相结构通过POM（偏振光学显微镜）确定。结果表明，SDS / C ₁₀ H ₂₁ OH / H _2的层状结构加入混合溶液CA和ZN后的O系统稳定。CA的存在抑制了氧化锆颗粒的团聚和生长。氧化锆粉末的微晶尺寸减小，并且在添加CA的情况下团聚程度低。傅立叶变换红外光谱（FI‐IR）分析表明，高温煅烧可将螯合有机配合物的结构保持在氧化锆结构中，从而导致氧空位，从而稳定了氧化锆的四方相。氧化锆粉末在CA与ZN的摩尔比为1：3至5：1的范围内保持为单一的亚稳四方相。随着CA与ZN的摩尔比在1：3至5：1的范围内增加，具有球形形态的氧化锆的微晶尺寸在32.2至20.1nm之间变化。