Article
Microemulsion based approach for nanospheres assembly into anisotropic nanostructures of NiMnO 3 and their magnetic properties
Journal of Solid State Chemistry
(2018)
Abstract
The present study focuses on synthesis of anisotropic nanostructures of nickel manganeseoxide (NiMnO3) obtained by thermal decomposition of nanocrystalline nickel manganese oxalate precursor, Ni0.5Mn0.5(C2O4)·2H2O which crystallized as nanorods. The synthesis of the oxalate precursor has been carried out via microemulsion-mediated process with cationic and non-ionic surfactants. The microemulsion led to reverse micelles, and the film flexibility of the micelle in presence of non-ionic surfactant (Tergitol) was reduced by increasing the chain length of the co-surfactant (1-butanol, 1-hexanol and 1-octanol) which led to the increase in reaction rate and hence increase in the aspect ratio of the nickel manganese oxalate by up to four times. However, in the presence of cationic surfactant, highly uniform nickel manganese oxalate nanorods were obtained. Further, the decomposition of the oxalate precursor was optimized to maintain the anisotropy of the rods of ternary metal oxide (NiMnO3). An electron microscopystudy showed that the rods were made up of an assembly of ultrafine nanospheres. The NiMnO3nanostructures were all ferrimagnetic with Curie temperature ranging between 437 and 467 K showing increasing saturation magnetization with increase in aspect ratio of the nanorods.
Keywords
- Microemulsion-mediated process,
- Anisotropic nanostructures,
- Nickel manganese oxide,
- Ferrimagnetism
Disciplines
Publication Date
February, 2018
DOI
10.1016/j.jssc.2017.12.006
Citation Information
Menaka Jha, Sandeep Kumar, Neha Garg, Kandalam V. Ramanujachary, et al.. "Microemulsion based approach for nanospheres assembly into anisotropic nanostructures of NiMnO 3 and their magnetic properties" Journal of Solid State Chemistry Vol. 258 (2018) p. 722 - 727 ISSN: 0022-4596 Available at: http://works.bepress.com/kandalam-ramanujachary/11/