Abstract
Hierarchical colloidal nanocrystal assemblies (CNAs) of ZnFe2O4 have been synthesized controllably by a solvothermal method. Hollow ZnFe2O4 spheres can be formed with the volume ratios of ethylene glycol to ethanol of 1:4 in the starting systems, while solid ZnFe2O4 CNAs are obtained by adjusting the volume proportion of ethylene glycol to ethanol from 1:2 to 2:1. Magnetometric measurement data showed that the ZnFe2O4 CNAs obtained with the volume ratios of 1:2 and 1:1 exhibited weak ferromagnetic behavior with high saturation magnetization values of 60.4 and 60.3 emu·g−1, respectively. However, hollow spheres showed a saturation magnetization value of 52.0 emu·g−1, but the highest coercivity among all the samples. It was found that hollow spheres displayed the best ability to adsorb Congo red dye among all the CNAs. The formation mechanisms of ZnFe2O4 CNAs, as well as the relationship between their structure, crystallite size, and properties were discussed based on the experimental results.
Highlights
Spinel ferrites have been widely studied in recent years in many important fields, such as clinical and biomedical fields [1], microwave adsorption [2], optoelectronic devices [3], catalysis [4], and drug loading materials [5] due to their excellent physical and chemical properties
2O4 colloidal nanocrystal assemblies (CNAs) were investigated by electron microscope (SEM)
CNA2 and CNA4 showed verycrystallite low remnant that the structure superparamagnetic–ferromagnetic transformation might occur with crystallite size of 20.4 nm—exhibited a saturation magnetization of 52.0 emu·g−1, which was smaller and coercivity among all the samples, which indicated that the superparamagnetic–ferromagnetic sizes slightly larger than nm
Summary
Spinel ferrites have been widely studied in recent years in many important fields, such as clinical and biomedical fields [1], microwave adsorption [2], optoelectronic devices [3], catalysis [4], and drug loading materials [5] due to their excellent physical and chemical properties. ZnFe2 O4 nanoparticles, which displayed enhanced gas sensing performance to acetone, were successfully synthesized by hydrothermal technology in the absence of structure directing agents or surfactant [19]. Hierarchical shuttle-shaped mesoporous ZnFe2O4 microrods with enhanced lithium storage for advanced Li-ion batteries obtained a two-step strategy [20].Li-ion. ZnFe2 O4 were microrods withusing enhanced lithiumsynthetic storage for advanced batteries using a to find asynthetic facile way to controllably synthesize and eventohierarchical structures of zinc two-step strategy [20]. It is still hollow a great challenge find a facile way to controllably ferrite nanomaterials.
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