Synthesis of Ni/SiO2 nanocomposites for tunable electromagnetic absorption

Gong, Chunhong; Wang, Xinxin; Zhang, Xuefeng; Zhao, Xiaowei; Meng, Hongping; Jia, Yongshuai; Zhang, Jingwei; Zhang, Zhijun

doi:10.1016/j.matlet.2014.01.138

Cited by 29 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The superparamagnetism was also observed in this report which is analogous to the magnetic behaviour of present sample as the size of zinc ferrite nanoparticles is smaller than the superparamagnetic critical dimension. Gong et al [67] demonstrated the tuning electro-magnetic absorption studies of Ni/SiO 2 nanocomposites fabricated by wet chemical approach. Typical ferromagnetic behavior and the dependence of magnetic properties on the grain size were observed by them.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Borade

Somvanshi

Kale³

et al. 2020

Mater. Res. Express

120

View full text Add to dashboard Cite

A profoundly effective magnetically recoverable nano zinc ferrite nanocatalyst was fabricated by means of sol-gel auto ignition strategy. The synthesized nanocatalyst has been completely portrayed by standard techniques for structural, morphological, compositional, surface, magnetic, dielectric, optical and photoluminescence properties individually. The x-ray diffraction pattern affirmed the arrangement of cubic spinel structure with an average crystallite size of 21 nm. FE-SEM images uncovered the circular morphology with nanometric average grain measure (37 nm). The surface area, pore volume and pore radius was observed to be 39.812 m 2 g −1 , 3.41 cc g −1 and 1.34 nm individually from BET analysis. VSM investigation demonstrated the superparamgnetic nature of the prepared sample with moderate magnetization value and negligible coercivity. The optical band gap deduced from UV-vis spectra was observed to be 2.098 eV. Every one of these properties of zinc nanoferrite makes them brilliant contender for microwave radiation absorption. Further, a proficient and versatile microwave irradiated solvent free synthesis of chalcone derivatives has been developed using prepared zinc nanoferrite catalyst. The remarkable highlights of this new protocol are solvent free reaction, economical cheapness, eco-friendliness, high yields, reduced reaction times and easy recovery and reuse of zinc ferrite nanocatalyst.

show abstract

Section: Magnetic Propertiesmentioning

confidence: 99%

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Borade

Somvanshi

Kale³

et al. 2020

Mater. Res. Express

120

View full text Add to dashboard Cite

show abstract

“…Based on our previous work, 17 Ni/SiO 2 nanocomposites were prepared and used as the precursors (denoted as S-0). Based on our previous work, 17 Ni/SiO 2 nanocomposites were prepared and used as the precursors (denoted as S-0).…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Ni₃N/SiO₂ nanocomposites and investigation of their intrinsic static and dynamic magnetic properties

et al. 2015

Self Cite

View full text Add to dashboard Cite

Ni 3 N/SiO 2 nanocomposites were prepared via nitriding of a Ni/SiO 2 nanocomposite precursor in flowing ammonia. The intrinsic static and dynamic magnetic properties of the as-prepared samples were investigated with a superconducting quantum interference device and an Agilent N5230A network analyzer, respectively. According to our results, it was found that pure phase nanocrystalline Ni 3 N could be obtained after the Ni/SiO 2 nanocomposite precursor was calcined under a flow of NH 3 at 300 C, and the as-obtained nanocrystalline Ni 3 N is non-ferromagnetic under a static magnetic field and nonmagnetic under a dynamic electromagnetic field.

show abstract

“…31 To the best of our knowledge, there are scarce reports on the preparation and microwave absorption properties of core-shell Ni-TiO 2 and Ni-SiO 2 composites. 32 Hence, our manuscript presents a competitive work. In this work, the core-shell Ni-TiO 2 and Ni-SiO 2 composites were synthesized by a two-step process.…”

Section: Introductionmentioning

confidence: 97%

Investigation of the electromagnetic absorption properties of Ni@TiO₂ and Ni@SiO₂ composite microspheres with core–shell structure

Zhao

Shao

Fan

et al. 2015

Phys. Chem. Chem. Phys.

288

157

View full text Add to dashboard Cite

In this work, amorphous TiO2 and SiO2-coated Ni composite microspheres were successfully prepared by a two-step method. The phase purity, morphology, and structure of composite microspheres are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Due to the presence of the insulator SiO2 shell, the core-shell Ni-SiO2 composite microspheres exhibit better antioxidation capability than that of pure Ni microspheres. The core-shell Ni-SiO2 composite microspheres show the best microwave absorption properties than those of pure Ni microspheres and Ni-TiO2 composites. For Ni-SiO2 composite microspheres, an optimal reflection loss (RL) as low as -40.0 dB (99.99% absorption) was observed at 12.6 GHz with an absorber thickness of only 1.5 mm. The effective absorption (below -10 dB, 90% microwave absorption) bandwidth can be adjusted between 3.1 GHz and 14.4 GHz by tuning the absorber thickness in the range of 1.5-4.5 mm. The excellent microwave absorption abilities of Ni-SiO2 composite microspheres are attributed to a higher attenuation constant, Debye relaxation, interface polarization of the core-shell structure and synergistic effects between high dielectric loss and high magnetic loss.

show abstract

Synthesis of Ni/SiO2 nanocomposites for tunable electromagnetic absorption

Cited by 29 publications

References 7 publications

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Synthesis of Ni₃N/SiO₂ nanocomposites and investigation of their intrinsic static and dynamic magnetic properties

Investigation of the electromagnetic absorption properties of Ni@TiO₂ and Ni@SiO₂ composite microspheres with core–shell structure

Contact Info

Product

Resources

About

Synthesis of Ni/SiO2 nanocomposites for tunable electromagnetic absorption

Cited by 29 publications

References 7 publications

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Synthesis of Ni3N/SiO2 nanocomposites and investigation of their intrinsic static and dynamic magnetic properties

Investigation of the electromagnetic absorption properties of Ni@TiO2 and Ni@SiO2 composite microspheres with core–shell structure

Contact Info

Product

Resources

About

Synthesis of Ni₃N/SiO₂ nanocomposites and investigation of their intrinsic static and dynamic magnetic properties

Investigation of the electromagnetic absorption properties of Ni@TiO₂ and Ni@SiO₂ composite microspheres with core–shell structure