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A facile hydrothermal approach to the synthesis of nanoscale rare earth hydroxides.

Li C, Liu H, Yang J - Nanoscale Res Lett (2015)

Bottom Line: Nanosized rare earth (RE) hydroxides including La(OH)3, Nd(OH)3, Pr(OH)3, Sm(OH)3, Gd(OH)3, and Er(OH)3 with rod-like morphology are fabricated via a convenient hydrothermal approach.CeO2 nanoparticles with spherical shape could be directly obtained by hydrothermal treatment of complexes formed between Ce precursors and DDA.In addition, by further calcinating the RE hydroxides at high temperature in air, RE oxide nanorods could be readily produced.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 China ; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049 China.

ABSTRACT
Nanosized rare earth (RE) hydroxides including La(OH)3, Nd(OH)3, Pr(OH)3, Sm(OH)3, Gd(OH)3, and Er(OH)3 with rod-like morphology are fabricated via a convenient hydrothermal approach. This strategy calls for the first preparation of metal complexes between RE precursors and dodecylamine (DDA) in water/ethanol mixture at room temperature and subsequent thermal decomposition at elevated temperature. The influence of reaction time and water/ethanol volume ratios on the morphology and size of as-prepared RE hydroxides are investigated. CeO2 nanoparticles with spherical shape could be directly obtained by hydrothermal treatment of complexes formed between Ce precursors and DDA. In addition, by further calcinating the RE hydroxides at high temperature in air, RE oxide nanorods could be readily produced.

No MeSH data available.


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XRD patterns of RE hydroxides as prepared by decomposing the RE precursor-DDA complexes at elevated temperature.
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Fig1: XRD patterns of RE hydroxides as prepared by decomposing the RE precursor-DDA complexes at elevated temperature.

Mentions: The RE precursor-DDA complexes are then decomposed at elevated temperature, resulting in the generation of RE hydroxide products, labeled as RE(OH)3, which subsequently grow into RE(OH)3 nanorods and are protected by DDA. The possible mechanism accounting for the formation of RE(OH)3 might resemble the preparation of lanthanide hydroxide using oleylamine [13] or triethylamine [17] as organic additives, the protonation of which leads to the generation of hydroxyl ions from water solvent for the formation of hydroxides. In this work, DDA provides the basic environment for the formation of RE hydroxides. FigureĀ 1 shows the XRD patterns of RE(OH)3 samples. All the diffraction peaks can be readily indexed to the pure hexagonal phase. The peaks are steep and high, and no additional peaks of other phases have been found, indicating that the RE(OH)3 products are well crystallized and of high purity. The lattice constants (a and c) were calculated and listed in Additional file 1: Table S1. The decrease in lattice constants from Pr to Er hydroxides can be attributed to the well-known lanthanide contraction [18,19].Figure 1


A facile hydrothermal approach to the synthesis of nanoscale rare earth hydroxides.

Li C, Liu H, Yang J - Nanoscale Res Lett (2015)

XRD patterns of RE hydroxides as prepared by decomposing the RE precursor-DDA complexes at elevated temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385291&req=5

Fig1: XRD patterns of RE hydroxides as prepared by decomposing the RE precursor-DDA complexes at elevated temperature.
Mentions: The RE precursor-DDA complexes are then decomposed at elevated temperature, resulting in the generation of RE hydroxide products, labeled as RE(OH)3, which subsequently grow into RE(OH)3 nanorods and are protected by DDA. The possible mechanism accounting for the formation of RE(OH)3 might resemble the preparation of lanthanide hydroxide using oleylamine [13] or triethylamine [17] as organic additives, the protonation of which leads to the generation of hydroxyl ions from water solvent for the formation of hydroxides. In this work, DDA provides the basic environment for the formation of RE hydroxides. FigureĀ 1 shows the XRD patterns of RE(OH)3 samples. All the diffraction peaks can be readily indexed to the pure hexagonal phase. The peaks are steep and high, and no additional peaks of other phases have been found, indicating that the RE(OH)3 products are well crystallized and of high purity. The lattice constants (a and c) were calculated and listed in Additional file 1: Table S1. The decrease in lattice constants from Pr to Er hydroxides can be attributed to the well-known lanthanide contraction [18,19].Figure 1

Bottom Line: Nanosized rare earth (RE) hydroxides including La(OH)3, Nd(OH)3, Pr(OH)3, Sm(OH)3, Gd(OH)3, and Er(OH)3 with rod-like morphology are fabricated via a convenient hydrothermal approach.CeO2 nanoparticles with spherical shape could be directly obtained by hydrothermal treatment of complexes formed between Ce precursors and DDA.In addition, by further calcinating the RE hydroxides at high temperature in air, RE oxide nanorods could be readily produced.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 China ; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049 China.

ABSTRACT
Nanosized rare earth (RE) hydroxides including La(OH)3, Nd(OH)3, Pr(OH)3, Sm(OH)3, Gd(OH)3, and Er(OH)3 with rod-like morphology are fabricated via a convenient hydrothermal approach. This strategy calls for the first preparation of metal complexes between RE precursors and dodecylamine (DDA) in water/ethanol mixture at room temperature and subsequent thermal decomposition at elevated temperature. The influence of reaction time and water/ethanol volume ratios on the morphology and size of as-prepared RE hydroxides are investigated. CeO2 nanoparticles with spherical shape could be directly obtained by hydrothermal treatment of complexes formed between Ce precursors and DDA. In addition, by further calcinating the RE hydroxides at high temperature in air, RE oxide nanorods could be readily produced.

No MeSH data available.


Related in: MedlinePlus