Enhanced magnetorheological effect of suspensions based on carbonyl iron particles coated with poly(amidoamine) dendrons

Plachý, Tomáš; Cvek, Martin; Münster, Lukáš; Hanulíková, Barbora; Šuly, Pavol; Vesel, Alenka; Cheng, Qilin

doi:10.1007/s00397-021-01269-1

Cited by 17 publications

(27 citation statements)

References 52 publications

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“…Similar trends were observed for total pore volume, which decreased from 0.098 to 0.063 cm 3 /g after applying the compact TEOS coating, whereas 0.451 cm 3 /g was attained following the application of the mesoporous coating, signifying enhanced kinetic stability when in the bidisperse MR suspension. In connection with this, heightened chemical stability of the coated particles was anticipated as well as decreased abrasiveness due to the protective effect exerted by the organo-shell coatings [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Stable Magnetorheological Fluids Containing Bidisperse Fillers with Compact/Mesoporous Silica Coatings

Cvek

Jamatia

Šuly

et al. 2022

IJMS

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A drawback of magnetorheological fluids is low kinetic stability, which severely limits their practical utilization. This paper describes the suppression of sedimentation through a combination of bidispersal and coating techniques. A magnetic, sub-micro additive was fabricated and sequentially coated with organosilanes. The first layer was represented by compact silica, while the outer layer consisted of mesoporous silica, obtained with the oil–water biphase stratification method. The success of the modification technique was evidenced with transmission electron microscopy, scanning electron microscopy/energy-dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. The coating exceptionally increased the specific surface area, from 47 m2/g (neat particles) up to 312 m2/g, which when combined with lower density, resulted in remarkable improvement in the sedimentation profile. At this expense, the compact/mesoporous silica slightly diminished the magnetization of the particles, while the magnetorheological performance remained at an acceptable level, as evaluated with a modified version of the Cross model. Sedimentation curves were, for the first time in magnetorheology, modelled via a novel five-parameter equation (S-model) that showed a robust fitting capability. The sub-micro additive prevented the primary carbonyl iron particles from aggregation, which was projected into the improved sedimentation behavior (up to a six-fold reduction in the sedimentation rate). Detailed focus was also given to analyze the implications of the sub-micro additives and their surface texture on the overall behavior of the bidisperse magnetorheological fluids.

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Section: Resultsmentioning

confidence: 99%

Stable Magnetorheological Fluids Containing Bidisperse Fillers with Compact/Mesoporous Silica Coatings

Cvek

Jamatia

Šuly

et al. 2022

IJMS

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“…The dynamic yield stress was obtained by fitting the shear rate-shear stress curve using the Bingham plastic model. 1,68 The results showed that the yield stress of the SO/IL-OH-based MR fluid with a ratio of SO/IL-OH = 4:3 was significantly higher than that of the SO-based MR fluid due to the strong intermolecular interactions between the SO and IL-OH molecules. However, Overall, these experimental results proved that the SO/IL-OH = 4:3-based MR fluid has excellent mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…It can be speculated that the formation of a chainlike structure under the magnetic field results in the MR fluid exhibiting solid-like properties, and thereby, it has obvious LVE behavior. 68 Beyond the strain amplitude of 1.0%, both G′ and G″ decreased dramatically, indicating that the chainlike structures were destroyed. In addition, G″ was higher than G′, which suggests that the SO/IL-OH = 4:3-based MR fluid mainly had liquid properties in the strain amplitude range of 10.0−100.0%.…”

Section: Resultsmentioning

confidence: 99%

“…Figure a shows the dynamic yield stress-magnetic strength curves of the MR fluids with different types of carrier liquids (SO, SO/IL-OH = 2:5 and SO/IL-OH = 4:3). The dynamic yield stress was obtained by fitting the shear rate-shear stress curve using the Bingham plastic model. , The results showed that the yield stress of the SO/IL-OH-based MR fluid with a ratio of SO/IL-OH = 4:3 was significantly higher than that of the SO-based MR fluid due to the strong intermolecular interactions between the SO and IL-OH molecules. However, the yield stress of the SO/IL-OH-based MR fluid with a ratio of SO/IL-OH = 2:5 was lower than that of the SO-based MR fluid.…”

Section: Resultsmentioning

confidence: 99%

“…As clearly observed in the storage modulus curves (Figure c), G ′ was independent of shear strain under the external magnetic field (0.12–0.55 T) at the low strain amplitude stage (0.005–1.0%), and the strain amplitude range is termed the linear viscoelastic (LVE) region. , In the LVE region, G ′ was higher than G ″ at the same magnetic field strength. It can be speculated that the formation of a chainlike structure under the magnetic field results in the MR fluid exhibiting solid-like properties, and thereby, it has obvious LVE behavior . Beyond the strain amplitude of 1.0%, both G ′ and G ″ decreased dramatically, indicating that the chainlike structures were destroyed.…”

Section: Resultsmentioning

confidence: 99%

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Molecular Dynamics Simulations and Experimental Studies of the Microstructure and Mechanical Properties of a Silicone Oil/Functionalized Ionic Liquid-Based Magnetorheological Fluid

Zhao

Tong

et al. 2022

ACS Appl. Mater. Interfaces

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Magnetorheological (MR) fluids are smart materials that show enormous potential in vibration control, mechanical engineering, etc. However, the effects of the solid–liquid interface strength and the interaction strength between carrier liquid molecules on the mechanical properties and sedimentation stability of MR fluids have always been unresolved issues. This work presents a new type of MR fluid that has a novel carrier liquid, i.e., silicone oil (SO) mixed with a hydroxyl-functionalized ionic liquid (IL-OH). An all-atomic Fe/SO/IL-OH interface model for studying the relationship between mechanical properties and interface strength and intermolecular interactions is established. On the basis of simulation results and theoretical analyses, the mechanical properties and sedimentation stability of the SO/IL-OH-based MR fluids are thoroughly investigated by experiments. The results show that functional ionic liquids significantly improve the mechanical properties and sedimentation stability of MR fluids. These results are essentially attributed to the stronger solid–liquid interface strength, van der Waals forces, and hydrogen bonds between the silicone oil and the functional ionic liquid. The explicit results not only help elucidate the numerous phenomena involved in the research process for MR fluids at the atomic scale but also provide insightful information on the fabrication of high-performance MR fluids.

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Constitutive modeling of magnetorheological fluids: A review

Pei

Peng

2022

Journal of Magnetism and Magnetic Materials

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Enhanced magnetorheological effect of suspensions based on carbonyl iron particles coated with poly(amidoamine) dendrons

Cited by 17 publications

References 52 publications

Stable Magnetorheological Fluids Containing Bidisperse Fillers with Compact/Mesoporous Silica Coatings

Stable Magnetorheological Fluids Containing Bidisperse Fillers with Compact/Mesoporous Silica Coatings

Molecular Dynamics Simulations and Experimental Studies of the Microstructure and Mechanical Properties of a Silicone Oil/Functionalized Ionic Liquid-Based Magnetorheological Fluid

Constitutive modeling of magnetorheological fluids: A review

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