Facile synthesis of ellipsoidal hematite nanostructures via an EDA-assisted solvothermal method

Xu, Chunju; Wang, Yanzhong; Chen, Huiyu

doi:10.1007/s10854-015-3100-6

Cited by 4 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed Mr value is much higher, whereas the Hc value is much lower than those of other α-Fe2O3 nanoplates described in the literature. [49]. They suggested that increase in the coercivity may have occurred due to the higher shape anisotropy for α-Fe2O3 ellipsoids [49].…”

Section:  mentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Tadić

Kopanja

Panjan

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

Please cite this article as: Marin Tadic, Lazar Kopanja, Matjaz Panjan, Slavko Kralj, Jasmina Nikodinovic-Runic, Zoran Stojanovic, Synthesis of core-shell hematite (␣-Fe2O3) nanoplates: quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity, Applied Surface Science http://dx. 2 Graphical abstractHighlights  Uniform plate-like nanopartices are synthesized by hydrothermal method. Low-citotoxicity of hematite nanoplates is observed. High coercivity of the sample point to the shape anisotropy. Shape and structure of the nanoplates are analysed by computational methods. AbstractHematite core-shell nanoparticles with plate-like morphology were synthesized using a one-step hydrothermal synthesis. An XRPD analysis indicates that the sample consist of single-phase α-Fe2O3 nanoparticles. SEM and TEM measurements show that the hematite sample is composed 3 of uniform core-shell nanoplates with 10-20 nm thickness, 80-100 nm landscape dimensions (aspect ratio ~5) and 3-4 nm thickness of the surface shells. We used computational methods for the quantitative analysis of the core-shell particle structure and circularity shape descriptor for the quantitative shape analysis of the nanoparticles from TEM micrographs. The calculated results indicated that a percentage of the shell area in the nanoparticle area (share [%]) is significant. The determined values of circularity in the perpendicular and oblique perspective clearly show shape anisotropy of the nanoplates. The magnetic properties revealed the ferromagnetic-like properties at room temperature with high coercivity HC=2340 Oe, pointing to the shape and surface effects. These results signify core-shell hematite nanoparticles' for practical applications in magnetic devices. The synthesized hematite plate-like nanoparticles exhibit low cytotoxicity levels on the human lung fibroblasts (MRC5) cell line demonstrating the safe use of these nanoparticles for biomedical applications.

show abstract

Section:  mentioning

confidence: 99%

“…[49]. They suggested that increase in the coercivity may have occurred due to the higher shape anisotropy for α-Fe2O3 ellipsoids [49]. Straumal et al showed the importance of disordered interfaces and intergranular regions for driving high-temperature ferromagnetism behavior [54,55].…”

Section:  mentioning

confidence: 99%

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Tadić

Kopanja

Panjan

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…Chihi et al [9] investigated the biosynthesis of hematite nanoparticles, noting the influence of FeCl3 precursor concentration on particle size and band gap. The solvothermal synthesis of ellipsoidal hematite nanostructures using ethylenediamine was elucidated by Xu et al [10]. The impact of the reducing agent NaBH4 on the morphology, structure, and magnetic properties of nano hematite was studied by Saravanakumar et al [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hematite Crystals from Natural Iron Sand: The Influence of Heating on Optical and Magnetic Properties

Suardana,

Sumadiyasa,

Sudatri

et al. 2024

RCMA

View full text Add to dashboard Cite

The objective of this study was to synthesize α-Fe2O3 (hematite) crystals through a mechanical precipitation approach and investigate the influence of elevated annealing temperatures on their optical and magnetic properties. Initially, iron sand was mechanically ground into fine powder using an agate mortar. This powder was then solubilized in 400 mL of 37% HCl and subsequently filtered using Whatman filter paper No. 42. The resulting filtrate was stirred magnetically at 200 rpm while ammonium hydroxide was gradually introduced until a pH of 8 was achieved, precipitating the desired product. The precipitate was separated, washed with deionized water, and dried on a hot plate at 100℃ for one hour. The dried product was divided into four samples and each was subjected to annealing at temperatures of 300℃, 400℃, 500℃, and 550℃ for one hour, respectively. X-ray diffraction (XRD) analysis, corroborated by the Crystallographic Open Database (COD), confirmed that the synthesized hematite crystals exhibited a hexagonal structure belonging to the R-3c space group. A notable decrease in grain size was observed with increasing annealing temperature, shrinking from approximately 0.44 µm at 300℃ to around 0.36 µm at 500℃. This trend suggests that higher temperatures facilitate the disintegration of aggregates into finer particles. Vibrating Sample Magnetometry (VSM) revealed that the hematite crystals possessed high coercivity and remanence, both of which decreased with rising annealing temperatures, indicative of their ferromagnetic nature. UV-Visible spectroscopy identified maximum absorption within the 200-202 nm range, with the peak absorption occurring at 201.56 nm for crystals annealed at 500℃. Additionally, bandgap energy was observed to increase from 2.632 eV at an annealing temperature of 300℃ to 3.708 eV at 550℃. In conclusion, the mechanical precipitation method effectively produced ferromagnetic hematite microparticles from natural iron sand, with their properties significantly influenced by the annealing temperature. These findings offer insights into the tunable nature of hematite's optical and magnetic characteristics, with implications for their application in various technological domains.

show abstract

Re-formation of metastable ε-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties

Nikolić

Spasojević

Panjan

et al. 2017

Ceramics International

View full text Add to dashboard Cite

Facile synthesis of ellipsoidal hematite nanostructures via an EDA-assisted solvothermal method

Cited by 4 publications

References 19 publications

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of core-shell hematite (α-Fe2O3) nanoplates: Quantitative analysis of the particle structure and shape, high coercivity and low cytotoxicity

Synthesis of Hematite Crystals from Natural Iron Sand: The Influence of Heating on Optical and Magnetic Properties

Re-formation of metastable ε-Fe2O3 in post-annealing of Fe2O3/SiO2 nanostructure: Synthesis, computational particle shape analysis in micrographs and magnetic properties

Contact Info

Product

Resources

About