Synthesis of ferrofluids using a chemically induced transition method and their characterization

Meng, Xiangshen; Qiu, Xiaoyan; Ji, Zhao; Lin, Yueqiang; Liu, Xiaodong; Li, Decai; Li, Jian; He, Zhenghong

doi:10.1007/s00396-018-04462-6

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…1,17,70 The ideal size distribution for a ferrofluid is ∼10 nm because the magnetization is reduced below 10 nm and because smaller particles are more stable in a suspension. 12,58 While coprecipitation is a desirable synthesis method due to its low cost and simple methodology, the lack of control over the NP size range and high likelihood of oxidation due to oxidizing environments make coprecipitation unreliable. When a higher control over the size distribution and magnetic activity is required, synthesis via thermal decomposition is usually the chosen method.…”

Section: Synthesis Of Ferrofluidsmentioning

confidence: 99%

“…When the addition of basic NaOH or NH 3 is carried out while the solution undergoes vigorous stirring, the maghemite and magnetite precipitate has an average diameter of 12.6 ± 0.2 nm. ,, The ideal size distribution for a ferrofluid is ∼10 nm because the magnetization is reduced below 10 nm and because smaller particles are more stable in a suspension. , …”

Section: Synthesis Of Ferrofluidsmentioning

confidence: 99%

“…11 The smaller particle size in ferrofluids results in higher suspension stability, which produces an extended suspension time. 12 The enhanced stability makes ferrofluids ideal for many applications and opens up opportunities that could not be achieved with MR fluids. Furthermore, magnetic fluids can be distinguished based on visual examination when placed in a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…MR fluids incorporate micron-sized particles for suspension, while ferrofluids integrate particles in the lower nanometer range . The smaller particle size in ferrofluids results in higher suspension stability, which produces an extended suspension time . The enhanced stability makes ferrofluids ideal for many applications and opens up opportunities that could not be achieved with MR fluids.…”

Section: Introductionmentioning

confidence: 99%

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Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

et al. 2022

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Ferrofluids are colloidal suspensions of iron oxide nanoparticles (IONPs) within aqueous or nonaqueous liquids that exhibit strong magnetic properties. These magnetic properties allow ferrofluids to be manipulated and controlled when exposed to magnetic fields. This review aims to provide the current scope and research opportunities regarding the methods of synthesis of nanoparticles, surfactants, and carrier liquids for ferrofluid production, along with the rheology and applications of ferrofluids within the fields of medicine, water treatment, and mechanical engineering. A ferrofluid is composed of IONPs, a surfactant that coats the magnetic IONPs to prevent agglomeration, and a carrier liquid that suspends the IONPs. Coprecipitation and thermal decomposition are the main methods used for the synthesis of IONPs. Despite the fact that thermal decomposition provides precise control on the nanoparticle size, coprecipitation is the most used method, even when the oxidation of iron can occur. This oxidation alters the ratio of maghemite/magnetite, influencing the magnetic properties of ferrofluids. Strategies to overcome iron oxidation have been proposed, such as the use of an inert atmosphere, adjusting the Fe(II) and Fe(III) ratio to 1:2, and the exploration of other metals with the oxidation state +2. Surfactants and carrier liquids are chosen according to the ferrofluid application to ensure stability. Hence, a compatible carrier liquid (polar or nonpolar) is selected, and then, a surfactant, mainly a polymer, is embedded in the IONPs, providing a steric barrier. Due to the variety of surfactants and carrier liquids, the rheological properties of ferrofluids are an important response variable evaluated when synthesizing ferrofluids. There are many reported applications of ferrofluids, including biosensing, medical imaging, medicinal therapy, magnetic nanoemulsions, and magnetic impedance. Other applications include water treatment, energy harvesting and transfer, and vibration control. To progress from synthesis to applications, research is still ongoing to ensure control of the ferrofluids’ properties.

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Section: Synthesis Of Ferrofluidsmentioning

confidence: 99%

Section: Synthesis Of Ferrofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

et al. 2022

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“…For comparison, the kerosene-based ferro uids with a γ-Fe 2 O 3 MNP concentration of 0.4 % by weight [47] were heated to 80 ºC, then placed on the p-M for 25 min; however, the γ-Fe 2 O 3 MNPs did not precipitate.…”

mentioning

confidence: 99%

Magnetic separation accompanied by the phase transition for the purification of nematic liquid crystal

Meng

Li²,

Lin³

et al. 2022

Preprint

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Free ions are generally unfavorable in liquid crystal (LC) displays, and LC purification technologies are critically important. The colloidal γ-Fe2O3 magnetic nanoparticles (MNPs) have a high ratio of surface to volume, which may adsorb more free ions and are uniform in the LC at room temperature. The precipitation and separation of the doped colloidal γ-Fe2O3 MNPs resulting from the magnetic field accompanied by an isotropic-nematic phase transition are more efficient than in the single case of the phase transition or the magnetic field. The residual ion concentrations have decreased distinctly using the low gradient magnetic field (∇B ~ 2 T/m) with the phase transition. In addition, the higher the concentration of the doped colloidal γ-Fe2O3 MNPs, the lower the concentrations of the residual ions and γ-Fe2O3 MNPs. As a result, the commercial nematic LC can be purified by this approach based on nanotechnology in our study.

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Dependence of PEO content in the preparation of Fe3O4/PEO/TMAH ferrofluids and their antibacterial activity

et al. 2020

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Synthesis of ferrofluids using a chemically induced transition method and their characterization

Cited by 17 publications

References 46 publications

Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

Magnetic separation accompanied by the phase transition for the purification of nematic liquid crystal

Dependence of PEO content in the preparation of Fe3O4/PEO/TMAH ferrofluids and their antibacterial activity

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