Hysteresis of the magnetic properties of soft magnetic gels

Zubarev, A. Yu.; Chirikov, Dmitry; Borin, Dmitry; Степанов, Г. В.

doi:10.1039/c6sm01257d

Cited by 47 publications

(54 citation statements)

References 13 publications

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“…Similar hysteresis is observed also for field-induced modifications of rheological and other properties of soft MAEs. 40,[44][45][46] From the obtained values of (B), an estimation of surface roughness can be made by considering a suitable model of surface topography. For this purpose, lateral dimensions of topographical features deduced from optical microscopy images can be taken into account.…”

Section: Field-induced Modifications Of Surface Topographymentioning

confidence: 99%

Tunable surface roughness and wettability of a soft magnetoactive elastomer

Glavan

Szűcs

Belyaeva

et al. 2018

J of Applied Polymer Sci

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Surface topographical modifications of a soft magnetoactive elastomer (MAE) in response to variable applied magnetic field are investigated. The analysis is performed insitu and is based on optical microscopy, spread optical reflection and optical profilometry measurements. Optical profilometry analysis shows that the sensitivity of magnetic fieldinduced surface roughness with respect to external magnetic field is in the range of 1 µm/T. A significant hysteresis of surface modifications takes place for increasing and decreasing fields. Investigations of shape of sessile water droplets deposited on the MAE surface reveal that field-induced topographical modifications affect the contact angle of water at the surface. This effect is reversible and the sensitivity to magnetic field is in the range of 20/T.

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Section: Field-induced Modifications Of Surface Topographymentioning

confidence: 99%

Tunable surface roughness and wettability of a soft magnetoactive elastomer

Glavan

Szűcs

Belyaeva

et al. 2018

J of Applied Polymer Sci

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“…For maximal simplification of the mathematical part of the problem, we will suppose that the particles are identical. Like in [ 54 , 55 ], we will neglect fluctuations of the chain’s shape and will consider them as ideally straight aggregates, aligned along the applied magnetic field H . This model of the chain is illustrated in Figure 1 .…”

Section: Physical and Mathematical Modelmentioning

confidence: 99%

“…Strictly speaking, the value of a particle moment depends on the number i of the particle position in the chain. However, analysis [ 55 ] shows that approximation, where magnetic moments of all of the particles in the chain are supposed identical, leads to not significant deviations from the strict approach. That is why we will use the simplest approximation of identity of the particle moments in the chain.…”

Section: Physical and Mathematical Modelmentioning

confidence: 99%

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Shear Elasticity of Magnetic Gels with Internal Structures

Borin

Chirikov

Zubarev

2018

Sensors

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We present the results of the theoretical modeling of the elastic shear properties of a magnetic gel, consisting of soft matrix and embedded, fine magnetizable particles, which are united in linear chain-like structures. We suppose that the composite is placed in a magnetic field, perpendicular to the direction of the sample shear. Our results show that the field can significantly enhance the mechanical rigidity of the soft composite. Theoretical results are in quantitative agreement with the experiments.

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“…They also calculated the normal stress with different initial configurations and found that the particle structure had a big influence on the squeeze flow behavior. The influence of the particle structure on the performance of MR materials has been widely researched [23][24][25], and the results show that destroying the particle structure decreases the normal stress.…”

Section: Introductionmentioning

confidence: 99%

Normal stress in magnetorheological polymer gel under large amplitude oscillatory shear

Pang

Pei

Sun

et al. 2018

Journal of Rheology

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In this study, the normal stress in magnetorheological polymer gel (MRPG) under large amplitude oscillatory shear was investigated using experiments and particle-level simulations. Under large amplitude oscillatory shear, an intensely oscillating normal stress was measured with a period of exactly half the strain period. As the amplitude of the strain increased, the peak of the normal stress increased and the trough decreased. Changes in the normal stress were mainly caused by two factors: the Poynting effect, in which shear produces a normal force perpendicular to the shear direction, and magnetic-induced normal stress, which changes with the particle structure. In MRPG, both effects are related to the particle structure. The particle structure in MRPG with different strain was calculated and the simulation results show that the amplitude of the structural strain in oscillatory shearing is less than that of the applied strain. Additionally, a phase difference was observed between the structural strain and the applied strain. Based on the calculated particle structure, the change in the normal stress was obtained and found to agree well with the experimental results.

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Hysteresis of the magnetic properties of soft magnetic gels

Cited by 47 publications

References 13 publications

Tunable surface roughness and wettability of a soft magnetoactive elastomer

Tunable surface roughness and wettability of a soft magnetoactive elastomer

Shear Elasticity of Magnetic Gels with Internal Structures

Normal stress in magnetorheological polymer gel under large amplitude oscillatory shear

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