Surface properties of ceria synthesised using Triton-X based reverse microemulsions
作者:Polyxeni Paschalidou、Charis R. Theocharis
DOI:10.1039/c8ra08947g
日期:——
surface properties of ceria prepared by means of reversedmicelles and Ce(OiPr)4 has been systematically studied. Generally, solids with increased surface areas (up to 136 m2 g−1) were synthesised. It was shown that the tail length strongly affects the surface characteristics. Further studies were carried out using UV-Vis, ATR-FTIR, XRD and TGA/DSC studies of the precursor gels as well as N2-isothermal
系统研究了Triton-X表面活性剂的尾长对反胶束和Ce(O i Pr) 4制备的二氧化铈表面性质的影响。通常,合成表面积增加的固体(高达 136 m 2 g -1 )。结果表明,尾长强烈影响表面特性。使用前体凝胶以及 N 2的 UV-Vis、ATR-FTIR、XRD 和 TGA/DSC 研究进行了进一步研究-最终固体样品的等温吸附 BET、XRD、FT-IR、UV-Vis 漫反射和 SEM 研究。提出了二氧化铈前体分子与反相Triton X胶束极性尾的相互作用以及反相微乳液水核中二氧化铈(CeO 2 )颗粒的形成。
Shape-Controlled Synthesis of Well-Defined Matlockite LnOCl (Ln: La, Ce, Gd, Dy) Nanocrystals by a Novel Non-Hydrolytic Approach
作者:Kenneth R. Kort、Sarbajit Banerjee
DOI:10.1021/ic200114s
日期:2011.6.20
We report here a novel synthetic route for the preparation of well-defined and faceted nanocrystals of ternary rare earth oxychlorides based on the ligand exchange and condensation of rare earth halides and alkoxides in the presence of coordinating solvents. Nanocubes, faceted 2D nanosheets, and nanodisk morphologies are obtained as a result of preferential growth along specific crystallographic directions dictated by the choice of the rare earth ion and the capping ligand. The synthetic approach reported here represents a unique low-temperature route for the preparation of LnOCl in the PbFCl matlockite phase. The synthetic strategy can further be adapted to incorporate dopant ions. The potential applicability of these nanostructures as phosphors is illustrated by demonstrating the upconversion of near-infrared illumination to green and red emission by Er3+:GdOCl nanocrystals.