Ferrofluid with modified stabilisant

Bădescu, Rodica; Condurache, Daniel; Ivănoiu, M

doi:10.1016/s0304-8853(99)00331-5

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…6 The most commonly used protocol involves coprecipitation of ferrous and ferric ions in basic solutions. [7][8][9][10][11][12] However, the nanoparticles during the process of coprecipitation are likely to aggregate. Consequently, how to prevent aggregation between the nanoparticles during synthesis of Fe 3 O 4 has received considerable attention because the actual applications need welldispersed magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 98%

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Preparation of poly (ethylene oxide)‐graft‐poly (acrylic acid) copolymer stabilized iron oxide nanoparticles via an in situ templated process

Huang

2008

J of Applied Polymer Sci

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Superparamagnetic iron oxide nanoparticles were prepared in the presence of poly (ethylene oxide)-graft-poly (acrylic acid) copolymers via an in situ templated coprecipitation process. The resulted composite nanoparticles consisted of clusters of iron oxide monocrystals embedded inside the polymer chains, and were highly dispersible in aqueous solution. In these graft copolymers, the PAA segments were chemisorbed onto the Fe 3 O 4 nanoparticle surface through their carboxylic acid groups by forming carboxylate groups with the Fe atoms, while PEO segments as the stabilizers extended into the water matrix.Thus the composite nanoparticles exhibited narrow size distribution by the dynamic light scattering measurement. X-ray diffraction and magnetometer data confirmed the crystalline structure and superparamagnetic property of the particles. This procedure provided a good choice for preparing stable iron oxide magnetic nanoparticles with PEO modified surfaces.

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Section: Introductionmentioning

confidence: 98%

“…There have been various methods developed for the preparation of magnetic nanoparticles 6. The most commonly used protocol involves coprecipitation of ferrous and ferric ions in basic solutions 7–12. However, the nanoparticles during the process of coprecipitation are likely to aggregate.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly (ethylene oxide)‐graft‐poly (acrylic acid) copolymer stabilized iron oxide nanoparticles via an in situ templated process

Huang

2008

J of Applied Polymer Sci

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“…However, sloshing of general fluid is hard to control by itself; for reducing sloshing, additional structural elements are required in the fluid container [6][7][8]. Unlike general fluids, magnetic fluid is a colloidal solution in which separate ferromagnetic particles are distributed evenly in a medium and controllability fluid simultaneously possesses both magnetic and hydrodynamic properties.…”

Section: Introductionmentioning

confidence: 98%

Flow response of magnetic fluid surface by pitching motion

2010

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This research analyses the dynamic behavior of magnetic fluid that sloshes due to the pitching motion of the container. To analyze the behavior of magnetic fluid, we first analyze the equations that govern magnetic fluid as well as the momentum equation of the sloshing that results from a magnetic field. In each case, we conducted simulation and compared the results from simulation with those from experiments. When sloshing does not occur, the surface of the magnetic fluid rises towards the location of intensity of the magnetic field; in the absence of an additional, external body force, the fluid remains elevated. In case sloshing occurs simultaneously with the application of the magnetic field, the elevation of the surface as a result of the magnetic field is maintained. Further, we can confirm that if the excitation frequency of sloshing is small, the wave motion of the surface is small because the magnetic body force dominates the effect of sloshing. Even if the excitation frequency increases, the wave motion of the fluid surface is smaller than when a magnetic field is not applied. The fluid surface rises in that location where the intensity of the magnetic field is strong. Where the intensity of the magnetic field is weak, the height of the fluid surface is lower than the initial level that obtains in the absence of a magnetic field. Through the study, we can conclude that the sloshing behavior of magnetic fluid is influenced by the magnetic field intensity and distribution.

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“…), which will affect the rheological properties of ferrofluids and make shear thinning [ 13 ] or shear thickening [ 14 ] occur. The viscosity of silicon oil-based ferrofluids decreases with rising temperature, and increases with increasing magnetic field strength; the formation and destruction of chains and droplets are the key factors affecting magnetoviscous properties [ 15 , 16 ]. The viscosity of Co 3 O 4 /paraffin-based ferrofluids reduces with increasing shear rate, and the particle-to-particle bonds are thought to be responsible for the shear-thinning effect [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Rheological Properties of Zn-Ferrite/Perfluoropolyether Oil-Based Ferrofluids

Chen

Liu

et al. 2021

Nanomaterials

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The rheological properties of ferrofluids are related to various applications, such as sealing and loudspeakers, and have therefore attracted widespread attention. However, the rheological properties and their influence on the mechanisms of perfluoropolyether oil (PFPE oil)-based ferrofluids are complicated and not clear. Here, a series of PFPE oil-based ferrofluids were synthesized via a chemical co-precipitation method, and their rheological properties were revealed, systematically. The results indicate that the prepared Zn-ferrite particles have an average size of 12.1 nm, within a range of 4–18 nm, and that the ferrofluids have excellent dispersion stability. The activity of the ferrofluids changes from Newtonian to non-Newtonian, then to solid-like with increasing w from 10 wt% to 45.5 wt%, owing to their variation in microstructures. The viscosity of the ferrofluids increases with increasing Mw (the molecular weight of base liquid PFPE oil polymer), attributed to the increase in entanglements between PFPE oil molecules. The magnetization temperature variation of Zn-ferrite nanoparticles and viscosity temperature variation of PFPE oil together contribute to the viscosity temperature change in ferrofluids. The viscosity of the ferrofluids basically remains unchanged when shear rate is above 50 s−1, with increasing magnetic field strength; however, it first increases and then levels off when the rate is under 10 s−1, revealing that the shear rate and magnetic field strength together affect viscosity. The viscosity and its alteration in Zn-ferrite/PFPE oil-based ferrofluids could be deduced through our work, which will be greatly significant in basic theoretical research and in various applications.

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Ferrofluid with modified stabilisant

Cited by 7 publications

References 2 publications

Preparation of poly (ethylene oxide)‐graft‐poly (acrylic acid) copolymer stabilized iron oxide nanoparticles via an in situ templated process

Preparation of poly (ethylene oxide)‐graft‐poly (acrylic acid) copolymer stabilized iron oxide nanoparticles via an in situ templated process

Flow response of magnetic fluid surface by pitching motion

Investigation of the Rheological Properties of Zn-Ferrite/Perfluoropolyether Oil-Based Ferrofluids

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