Formation Pathways of Magnetite Nanoparticles by Coprecipitation Method

Ahn, Taebin; Kim, Jong Hun; Yang, Hee‐Man; Lee, Jeong Woo; Kim, Jong-Duk

doi:10.1021/jp211843g

Cited by 300 publications

(223 citation statements)

References 50 publications

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“…Interactions between the chitosan and ionic crosslinkers occurred through electrostatic interactions, which involve protonated of the amino group of chitosan and the negatively charged anionic group of TPP and sulfate. 7,20,21 Nanoparticles were then dried and characterized to investigate the physical characteristics and magnetic properties of each material with various composition ratio and crosslinking time. (Fig.…”

Section: Chitosan-coated Fe3o4 Nanoparticles Synthesismentioning

confidence: 99%

"CHARACTERISTICS AND MAGNETIC PROPERTIES OF CHITOSAN-COATED Fe3O4 NANOPARTICLES PREPARED BY EX-SITU CO-PRECIPITATION METHOD"

2017

RJC

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Chitosan-coated iron oxide nanoparticles were synthesized by ex-situ co-precipitation method. Ammonia solution was dropped into the solution containing ferrous and ferric salts through a syringe pump to form Fe3O4 nanoparticles. Nanoparticles produced were then coated and crosslinked with chitosan and tripolyphosphate/sulfate, respectively. The physical and magnetic properties of chitosan-Fe3O4 nanoparticles were characterized using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Electron Spin Resonance (ESR) respectively. The results showed that the ratio enhancement between chitosan:Fe3O4 increased the particle size, while the crystallite size decreased. Morphology and particle size were also influenced by the ratio of crosslinkers. It was found that the higher tripolyphosphate content contributed to the smaller size and more spherical morphology. In addition, the influence of crosslinking time toward crystallite size was determined by tuning stirring time. The result showed that the longer duration of crosslinking time, the larger crystallite size of chitosan-coated Fe3O4 was obtained.

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Section: Chitosan-coated Fe3o4 Nanoparticles Synthesismentioning

confidence: 99%

"CHARACTERISTICS AND MAGNETIC PROPERTIES OF CHITOSAN-COATED Fe3O4 NANOPARTICLES PREPARED BY EX-SITU CO-PRECIPITATION METHOD"

2017

RJC

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“…Maghemite can be synthesized by different methods such as: co-precipitation [12][13][14], hydrothermal [15], microemulsion [16], solution method [17] etc. The co-precipitation method is industrially attractive because of its ability to be scaled up, its reproducibility and its use of eco-friendly reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and electrochemical performances of γ-Fe2O3 cathode material for Li-ion batteries

Abbasi

Mirhabibi

Arabi³

et al. 2016

J Mater Sci: Mater Electron

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Maghemite nanoparticles were successfully synthesized via a co-precipitation method and electrochemical-optical properties of three different sizes were studied. Using this material as a Li-ion battery cathode, the results of charge-discharge tests showed that decreasing the maghemite particle size increased the lithium hosting capacity. First discharge capacities for cathodes made of material of particle size 11 and 19 nm were 206 and 186 mAh g -1 respectively, while for micron-sized cathode material a discharge capacity of 26 mAh g -1 was obtained. Electrochemical impedance spectroscopy (EIS) was used to derive equivalent circuit elements, which confirmed a reduction in lithium insertion resistance for material with a smaller particle size. EIS investigations disclosed that the R ct and Z W reduced with reduction of particle size, which indicates cathode material with lower particle size is more suitable. Band-gaps of the materials were determined using the diffuse reflectance spectroscopy technique on the base of Kubelka-Munk theory. The results showed that the needed energy for electron conduction reduces with reduction of particle size, which results in capacity enhancement.

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“…Upon addition of an excess of a base, typically ammonium hydroxide, magnetite precipitates as a black fine powder that is readily attracted by a magnet [38]. The overall reaction may be written as follows (Equation (1) …”

Section: Synthesis and Characterization Of Magnetite Nanoparticles Anmentioning

confidence: 99%

A Proof-of-Concept Portable Water Purification Device Obtained from PET Bottles and a Magnetite-Carbon Nanocomposite

Gaita¹,

Evangelisti

Panzarasa

2018

Recycling

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Widespread access to potable water is still far from being granted to populations of developing countries, especially in rural zones. For this reason, the development of easy-to-make, easy-to-use water purification devices is a topic of great social and economic importance. Poly(ethylene terephthalate) (PET) bottles are available worldwide, even in the remotest and poorest countries, as testified by the increasingly common practice of re-using bottles for solar water disinfection (SODIS). Here, we demonstrate how PET bottles could be re-used as a proof-of-concept water purification system. In this way, virtually the same bottle could be used first for SODIS and then for removing chemical contaminants. In the proposed approach, the bottles are treated with ethylenediamine to introduce amine groups, which are subsequently protonated with dilute acid. These functional groups allow the stable adsorption of a magnetite-activated carbon nanocomposite, which is prepared by a simple coprecipitation protocol. The efficiency of the nanocomposite and of the resulting prototype to remove model inorganic and organic pollutants (hexavalent chromium, industrial dyes) from water has been demonstrated. The proposed purification device is easy, cheap, and effective, all factors which could promote its use in developing and rural countries.

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Formation Pathways of Magnetite Nanoparticles by Coprecipitation Method

Cited by 300 publications

References 50 publications

"CHARACTERISTICS AND MAGNETIC PROPERTIES OF CHITOSAN-COATED Fe3O4 NANOPARTICLES PREPARED BY EX-SITU CO-PRECIPITATION METHOD"

"CHARACTERISTICS AND MAGNETIC PROPERTIES OF CHITOSAN-COATED Fe3O4 NANOPARTICLES PREPARED BY EX-SITU CO-PRECIPITATION METHOD"

Synthesis, characterization and electrochemical performances of γ-Fe2O3 cathode material for Li-ion batteries

A Proof-of-Concept Portable Water Purification Device Obtained from PET Bottles and a Magnetite-Carbon Nanocomposite

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