Modified chemical coprecipitation of magnetic magnetite nanoparticles using linear–dendritic copolymers

Abstract

In this investigation, magnetite nanoparticles (Fe 3 O 4 NPs) with a diameter of 5-10 nm were synthesized by coprecipitation from an alkaline solution of ferrous/ferric mixed salt-solution in the presence of copolymers. In this process, linear-dendritic copolymers containing a linear poly (ethylene glycol) core and dendritic poly (citric acid) arms were used as the stabilizer. The Fe 3 O 4 NPs were characterized by transmission electron microscopy, energy-dispersive spectra, X-ray powder diffraction, field emission scanning electron microscopy, Fourier transform infrared spectrometer, and vibrating sample magnetometer. Compared to classical coprecipitation, the results showed that uniform, ultrafine, nearly spherical, and high purity nano-magnetite particles with better magnetic properties could be prepared by this method. ARTICLE HISTORY

Bare Magnetite-Promoted Oxidative Hydroxylation of Arylboronic Acids and Subsequent Conversion into Phenolic Compounds

“…Magnetite can be obtained via two conventional chemical procedures: (1) the oxidation of ferrous Fe 2+ -containing salts, and (2) the co-precipitation of both Fe 2+ and Fe 3+ precursors in a stoichiometric ratio. 22 Other methodologies such as reverse micelles, chemical vapor deposition, thermal decomposition, and liquid-phase reduction can also be used. 23 In some practical applications, iron oxide nanoparticles are coated with polymers to prevent oxidation, agglomeration, and further functionalization.…”

Unveiling Sodium Ion Pollution in Spray-Dried Precursors and Its Implications for the Green Upcycling of Spent Lithium-Ion Batteries

“…Current recycling technologies of the spent LIBs mainly focus on the enhanced dissociation, , selective enrichment, , leaching extraction, , and efficient sintering of cathode materials , or the direct regeneration of failed cathode electrodes. , Throughout the whole recycling process, it is suggested that the preparation of battery precursors from the leaching solution of spent LIBs is the key purification and synthesis step connecting waste recovery and new material preparation; however, there are few systematic studies that have been published. Because of its advantages in parameter control such as sphericity, element distribution, and phase composition, the preparation of precursors by co-precipitation method appears in most studies. , However, insufficient dispersion and difficult control of particle size limit its real industrial applications . Therefore, researchers have developed the following novel preparation methods for battery precursors.…”

“…17,18 However, insufficient dispersion and difficult control of particle size limit its real industrial applications. 19 Therefore, researchers have developed the following novel preparation methods for battery precursors. The sol−gel method uses the leachate from spent LIBs to form a low-viscosity solution, which is then heated and dried to prepare a cathode precursor of new LIBs.…”

Preparation of Cobalt Ferrite Nanoparticles Using Fulvic Acid as A Capping Agent and Its Effect on Catalytic Activity

“…As an example, the ferrites fabricated via the co-precipitation route acquired a non-aggregated and uniform structure [11][12][13][14][15][16][17][18][19][20] . Many studies explored the consequence of using some organic compounds on the coprecipitation process of metal ferrites [21][22][23][24][25] . Among them, polyvinyl pyrrolidone (PVP) was added as capping agent during the course of coprecipitation of cobalt ferrite [21] .…”