Magnetorheological Behavior of Polyethyene Glycol-Coated Fe3O4 Ferrofluids

Qiao, Xiuying; Bai, Mingwen; Tao, Ke; Gong, Xinglong; Gu, Rui; Watanabe, Hiroshi; Kim, Sun; Wu, Jing-Yuan; Kang, Xiaoyu

doi:10.1678/rheology.38.23

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…It means that in the absence of a magnetic field, the magnetic fluids studied in this experiment behaved as Newtonian fluids. This is in agreement with the finding that the magnetic fluids show typical Newtonian behavior when the solid content is low and exhibit strong [15,16]. The measured viscosity of the magnetic fluids before and after the addition of PEG is plotted against the temperature in Fig.…”

Section: Effect Of Peg Coating On Density and Rheological Behavior Ofsupporting

confidence: 89%

Effect of the Molecular Weight of Poly(ethylene glycol) on the Properties of Biocompatible Magnetic Fluids

et al. 2011

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The effect of the molecular weight of poly(ethylene glycol) (PEG) on the physical properties of water-based magnetic fluids with sodium oleate and PEG stabilization was investigated. The structure as well as magnetic, rheological, and thermal properties of the obtained samples were studied using transmission electron microscopy (TEM), photon cross correlation spectroscopy (PCCS), superconducting quantum interference device (SQUID), and differential scanning calorimetry (DSC) methods. The molecular weight of PEG had a strong effect on the rheological properties while the effect was rather insignificant on the particle size distribution and the self-heating of the studied magnetic fluids. The heating ability of the PEG-stabilized magnetic fluids was determined by calorimetric measurements of the specific absorption rate (SAR). The thickness of the PEG layer was calculated from the experimental data of the temperature rise rates as a function of the magnetic field strength using the Rosensweig theory.

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Section: Effect Of Peg Coating On Density and Rheological Behavior Ofsupporting

confidence: 89%

Effect of the Molecular Weight of Poly(ethylene glycol) on the Properties of Biocompatible Magnetic Fluids

et al. 2011

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“…The resulting anisotropy has a pronounced effect on Faraday rotation experiments. 10,11 In Fig. 3(a), the Faraday rotation is given as a function of the angle a.…”

mentioning

confidence: 99%

Preparing polymer films doped with magnetic nanoparticles by spin-coating and melt-processing can induce an in-plane magnetic anisotropy

Wouters

Lebedev

Tendeloo

et al. 2011

Journal of Applied Physics

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Faraday rotation has been used to investigate a series of polymer films doped with magnetic iron oxide nanoparticles. The films have been prepared by spin-coating and melt-processing. In each case, upon varying the angle of optical incidence on the films, an in-plane magnetic anisotropy is observed. The effect of such an anisotropy on the Faraday rotation as a function of the angle of optical incidence is verified by comparison with magnetically poled films. These results demonstrate that care should be taken upon analyzing the magnetic behavior of such films on account of the sample preparation techniques themselves being able to affect the magnetization.Due to their relatively low cost, superior magnetic properties, and ease of processing, magnetic nanoparticles are an interesting candidate for highly efficient Faraday materials. 1,2 In particular, incorporating these nanoparticles into a polymer matrix offers control over the interparticle distance and improves optical transmission. 3 Further, the resulting material presents additional degrees of tunability, as its magnetization can be manipulated by external stimuli, such as thermal, electric, magnetic, or mechanical effects and, from a practical point of view, it is very straightforward to handle. In practice, samples are typically prepared by introducing the nanoparticles into a polymer solution/melt and subsequently processed via drop casting, spin-coating, Langmuir-Blodgett technique, layer-by-layer assembly, etc. 4 However, because of this material's relatively high susceptibility to external mechanical stimuli, could not the sample preparation method itself affect the magnetization?In this communication, we make use of Faraday rotation to demonstrate that upon preparing thin films of Fe 3 O 4 nanoparticles within a polymer matrix, the mechanical forces that occur in the plane of the film during sample preparation can induce an in-plane magnetic anisotropy. The effects of this anisotropy are compared with those, induced by an externally applied magnetic field during sample preparation. Both the mechanically and the field-induced magnetic anisotropies likely arise from collective nanoparticle properties, which are due to reduced interparticle distances.The nanoparticles were prepared by the forced hydrolysis method. The salt precursor was analytical grade anhydrous FeCl 3 , the solvent was ethylene glycol, and octylamine was the capping agent.In a typical synthesis, 37.5 ml of ethylene glycol and 25 ml octylamine were introduced into a 100 ml round bottom flask and heated to 150 C. Then 2.4 g FeCl 3 was added to 10 ml ethylene glycol and 4 ml MilliQ water. After stirring, this solution was added drop-wise to the heated round bottom flask and further heated to reflux at 185 C for 18 h.After cooling, the nanoparticles were washed with acetone, precipitated by means of our homemade magnet and redispersed via sonication. This process was then repeated four times, after which the nanoparticles were dried in a vacuum oven. A typical synthesis yields around 1 g ...

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“…Meanwhile, the long chain of hydrophobic tails heading out in all directions prevented the magnetite particles from agglomeration. This phenomenon was prime important to achieve a physically and chemically stable colloidal system [34]. Besides, the surface coating with PEG was crucial to increase the water-dispersibility of the materials.…”

Section: Materials Synthesis and Characterizationsmentioning

confidence: 99%

Effect of Precipitation Temperature on Structural and Magnetic Features of Polyethylene Glycol-Coated Mn0.8Zn0.2Fe2 O 4 Nanoparticles

Kareem

Shamsuddin

Lee

2016

J Supercond Nov Magn

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The effects of precipitation temperature on both structural and magnetic properties of polyethylene glycolcoated Mn 0.8 Zn 0.2 Fe 2 O 4 nanoparticles are presented. Samples were prepared via co-precipitation method at different precipitation temperatures ranged 25-100 • C. X-ray diffraction analysis revealed that both crystallite size and lattice constant of the nanoparticles increased with increasing of temperature. FESEM images verified the existence of crystalline ferrites of diameter ranged 7.49-9.41 nm. FTIR spectra evidenced the effect of precipitation temperature on Fe 3+ -O 2− stretching vibration in the ferrites. These Mn 0.8 Zn 0.2 Fe 2 O 4 nanoparticles exhibited the highest saturation magnetization 20.938 emu/g at 75 • C. Correlations among precipitation temperature alteration, structural morphology, and magnetic response are established.

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Magnetorheological Behavior of Polyethyene Glycol-Coated Fe3O4 Ferrofluids

Cited by 16 publications

References 21 publications

Effect of the Molecular Weight of Poly(ethylene glycol) on the Properties of Biocompatible Magnetic Fluids

Effect of the Molecular Weight of Poly(ethylene glycol) on the Properties of Biocompatible Magnetic Fluids

Preparing polymer films doped with magnetic nanoparticles by spin-coating and melt-processing can induce an in-plane magnetic anisotropy

Effect of Precipitation Temperature on Structural and Magnetic Features of Polyethylene Glycol-Coated Mn0.8Zn0.2Fe2 O 4 Nanoparticles

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