Rapid synthesis of nano-magnetite by thermal plasma route and its magnetic properties

Koushika, E. M.; Shanmugavelayutham, G.; Saravanan, P.; Balasubramanian, C.

doi:10.1080/10426914.2018.1453163

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…From our observations, we can conclude that the α-FeOOH phase is separated from the NPs surface. Indeed, pure nanomagnetite is expected to have a M s value of ~90 emu g −1 [ 56 ]. Moreover, at high organic loading, the M s values will be reduced below reference values, and it will not be possible to say accurately that we have pure Fe 3 O 4 or γ-Fe 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Progress toward Room-Temperature Synthesis and Functionalization of Iron-Oxide Nanoparticles

Flores-Cano

Checca-Huaman

Castro-Merino

et al. 2022

IJMS

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Novel magnetic nanohybrids composed of nanomaghemite covered by organic molecules were successfully synthesized at room temperature with different functionalization agents (sodium polystyrene sulfonate, oxalic acid, and cetyltrimethylammonium bromide) in low and high concentrations. Structural, vibrational, morphological, electron energy-loss spectroscopy, magnetic, and Mössbauer characterizations unraveled the presence of mainly cubic inverse spinel maghemite (γ-Fe2O3), whilst X-ray diffraction and 57Fe Mössbauer spectroscopy showed that most samples contain a minor amount of goethite phase (α-FeOOH). Raman analysis at different laser power revealed a threshold value of 0.83 mW for all samples, for which the γ-Fe2O3 to α-Fe2O3 phase transition was observed. Imaging microscopy revealed controlled-size morphologies of nanoparticles, with sizes in the range from 8 to 12 nm. Organic functionalization of the magnetic nanoparticles was demonstrated by vibrational and thermogravimetric measurements. For some samples, Raman, magnetic, and Mössbauer measurements suggested an even more complex core-shell-like configuration, with a thin shell containing magnetite (Fe3O4) covering the γ-Fe2O3 surface, thus causing an increase in the saturation magnetization of approximately 11% against nanomaghemite. Field cooling hysteresis curves at 5 K did not evidence an exchange bias effect, confirming that the goethite phase is not directly interacting magnetically with the functionalized maghemite nanoparticles. These magnetic nanohybrids may be suitable for applications in effluent remediation and biomedicine.

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Section: Resultsmentioning

confidence: 99%

Progress toward Room-Temperature Synthesis and Functionalization of Iron-Oxide Nanoparticles

Flores-Cano

Checca-Huaman

Castro-Merino

et al. 2022

IJMS

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“…Randomly aligned, unpaired electrons in iron oxide crystals are captivated in the presence of an electrical or magnetic field. [35] Magnetic behavior of these crystals is temperature dependent and is expressed by the Curie−Weiss Law as shown in Equation 16.…”

Section: J ¼ H:κ (11)mentioning

confidence: 99%

Synthesis and characterization of magnetite nano particles with high selectivity using in-situ precipitation method

Rashid

Mansoor

Haider

et al. 2019

Separation Science and Technology

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In-situ precipitation method is widely used and reported in the literature for the synthesis of iron oxide nanoparticles based on their applications in many fields. However, the rate of reaction and rate constant for the production of Magnetite Phase of iron oxide did not study in depth. Reaction rates are required to design a scale-up of the process. In this study, Magnetite phase of iron oxide nanoparticles (Fe 3 O 4) are synthesized by the in-situ precipitation method, and the overall reaction rate is evaluated based on the concentration of Magnetite produced during the process. Further, X-ray diffraction, energy-dispersive X-ray spectroscopy and Raman spectroscopy are used to confirm the presence of a higher proportion of magnetite (Fe 3 O 4) in the final product, which is responsible for more top magnetic properties 74.615 emu. Changes in morphology of these nanoparticles at different intervals of the reaction are reported by transmission electron microscope. The results showed that spherical nanoparticles synthesized at different intervals of the reaction have a very narrow range of particle size, i.e. 9-15 nm. Detailed analysis reveals the presence of a higher share of maghemite (Fe 2 O 3) at the start of the reaction. However, maghemite eventually is converted to magnetite by the end of the reaction, thereby enhancing the magnetic strength of the nanoparticles.

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“…The evaporation temperature rises as the plasma input power was increased, resulting in the production of larger crystallites. The average crystallite size of the as-prepared Ni NPs was found to be 16.5, 20.3 and 26.7 nm corresponding to plasma input power of 1.5, 3.0 and 4.5 kW which was calculated using Scherrer equation [40].…”

Section: X-ray Analysismentioning

confidence: 99%

Synthesis of magnetic and superhydrophobic nickel nanoparticles by plasma arc discharge method, application for efficient recoverable and repeatable oil separation from oily-water

et al. 2021

Self Cite

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Nowadays, the contamination of water due to oily waste is causing a serious threat to the environment. There is a need of a method that possesses a simple treatment route, low operational cost and high durability. The oil-water extractors, using magnetic-hydrophobic nanoparticles, act as an efficient method to separate the oil present in the waste water. In this study, thermal plasma system was developed which was found to be the effective and eco-friendly method for materials processing such as the production of superhydrophobic sphere-shaped nickel nanoparticles used oil/water separation process. The chemical composition, morphology and crystal structure of synthesized nanoparticles were investigated by XRD, TEMand XPS. The saturation magnetization (Ms) 45.26 emu/g, coercivity (Hc) 91.8 Oe and remanent magnetization (Mr) 6.65 emu/g of synthesized nickel nanoparticle at room temperature were investigated by using the VSM technique. Synthesized Nickel nanoparticles have high oil absorption capacity, rapid absorption rate and are ideal reusable for oil-water separation treatment. The nickel-coated sponge was found to be superhydrophobic and superoleophilic, respectively, with a water interaction angle of 150.8º for water and 0º for oil. Thus, the nanoparticles coated sponge has a separation efficiency of more than 98%, in separating both the heavy and light oils from oily-water. The separation recycling of the petrol/water mixture remained more than 96% even after 20 separation cycles.

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Rapid synthesis of nano-magnetite by thermal plasma route and its magnetic properties

Cited by 18 publications

References 32 publications

Progress toward Room-Temperature Synthesis and Functionalization of Iron-Oxide Nanoparticles

Progress toward Room-Temperature Synthesis and Functionalization of Iron-Oxide Nanoparticles

Synthesis and characterization of magnetite nano particles with high selectivity using in-situ precipitation method

Synthesis of magnetic and superhydrophobic nickel nanoparticles by plasma arc discharge method, application for efficient recoverable and repeatable oil separation from oily-water

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