Rare‐Earth Oxide Nanostructures: Rules of Rare‐Earth Nitrate Thermolysis in Octadecylamine

Abstract

The decomposed regularity of rare-earth nitrates in octadecylamine (ODA) is discussed. The experimental results show that these nitrates can be divided into four types. For rare-earth nitrates with larger RE(3+) ions (RE=rare earth, La, Pr, Nd, Sm, Eu, Gd), the decomposed products exhibited platelike nanostructures. For those with smaller RE(3+) ions (RE=Y, Dy, Ho, Er, Tm, Yb), the decomposed products exhibited beltlike nanostructures. For terbium nitrate with a middle RE(3+) ion, the decomposed product exhibited a rodlike nanostructure. The corresponding rare-earth oxides, with the same morphologies as their precursors, could be obtained when these decomposed products were calcined. For cerium nitrate, which showed the greatest differences, flowerlike cerium oxide could be obtained directly from decomposition of the nitrate without further calcination. This regularity is explained on the basis of the lanthanide contraction. Owing to their differences in electron configuration, ionic radius, and crystal structure, such a nitrate family therefore shows different thermolysis properties. In addition, the potential application of these as-obtained rare-earth oxides as catalysts and luminescent materials was investigated. The advantages of this method for rare-earth oxides includes simplicity, high yield, low cost, and ease of scale-up, which are of great importance for their industrial applications.

Controllable Synthesis of Monodispersed Middle and Heavy Rare Earth Oxysulfide Nanoplates Based on the Principles of HSAB Theory

“…法, 得到了多种不同类型的稀土基纳米材料, 这其中包 括稀土的氧化物(RE 2 O 3 ) [13,14] , 氟化物(REF 3 ) [15,16] , 氟氧 化物(REOF) [17] , NaREF 4 型氟化物复盐 [18～21] , 氯氧化物 (REOCl) [22] , 硫氧化物(RE 2 O 2 S) [23] , NaRES 2 型硫化物复 盐 [24] 等. 在已发展出的合成方法中, 一类重要方法是高 沸点有机溶剂中的前驱体热分解法.…”

Oxidative injury in the mouse spleen caused by lanthanides

“…Our data showed that the production rate of ROS (such as O 2 •− , H 2 O 2 ) in the spleen of mice by intraperitoneal injection of Ln 3+ at dose of 20 mg/kg was significantly elevated ( Table 2), indicating that the spleen suffered oxidative stress. It is interesting that Ln caused elevated level of cellular ROS although Ln ions were previously thought to be scavengers of free radicals in vitro [35][36][37]. The reasons for the generation of ROS are not understood.…”

Peroxidase‐Mimicking Nanozyme with Enhanced Activity and High Stability Based on Metal–Support Interactions

“…In recent years, oxide-based nanocomposites have emerged as promising materials for highly efficient catalysts because the interaction between the oxide and other components often results in an improved catalytic performance. [25][26][27] In particular, cerium oxide (CeO 2 ), one of the most attractive rare-earth oxides, has been as ignificant active component of nanocompositesb ecause of its high oxygen-storage capacity ande xcellent catalytic activity. [28][29][30] CeO 2 has am ixed oxidation state (Ce 3 + ,C e 4 + )a nd exhibits strong redox behavior by switching betweent hese two states, which is analogoust ot he catalytic cycle of natural redox enzymes.…”