Tunable Drop Splashing on Magnetoactive Elastomers

Kravanja, Gaia; Belyaeva, Inna A.; Hribar, Luka; Drevenšek‐Olenik, Irena; Jezeršek, Matija; Shamonin, Mikhail

doi:10.1002/admi.202100235

Cited by 10 publications

(16 citation statements)

References 51 publications

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“…Here, G macro = φ(n p I − J), φ is the volume fraction of magnetic particles, J is the shape-dependent demagnetizing tensor. The Equation ( 6) can be further simplified by substituting the expression for G macro as M = (RI + φJ) −1 • H 0 (7) where R = χ −1 + n p − φn p . Further, the magnetic energy due to the interactions between the magnetized particles in the case of linear magnetization behaviour reads [22]…”

Section: Materials Modelmentioning

confidence: 99%

“…They comprise micron-sized magnetically soft/hard particles integrated into an elastomer matrix. MAEs are used in several engineering applications because of their exceptional macroscopic shape response to an applied magnetic field and a magneto-mechanical coupled behavior [1][2][3][4][5][6][7]. General applications of MAEs include actuators, sensors, adaptively tuned vibration absorbers, dampers, microfluid transport systems, adaptive engine mounts [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

2021

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Magnetoactive elastomers (MAEs) claim a vital place in the class of field-controllable materials due to their tunable stiffness and the ability to change their macroscopic shape in the presence of an external magnetic field. In the present work, three principal geometries of shear deformation were investigated with respect to the applied magnetic field. The physical model that considers dipole-dipole interactions between magnetized particles was used to study the stress-strain behavior of ellipsoidal MAEs. The magneto-rheological effect for different shapes of the MAE sample ranging from disc-like (highly oblate) to rod-like (highly prolate) samples was investigated along and transverse to the field direction. The rotation of the MAE during the shear deformation leads to a non-symmetric Cauchy stress tensor due to a field-induced magnetic torque. We show that the external magnetic field induces a mechanical anisotropy along the field direction by determining the distinct magneto-mechanical behavior of MAEs with respect to the orientation of the magnetic field to shear deformation.

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Section: Materials Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

2021

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“…[ 9 ] On the other hand, the tunability and control of magnetically active elastomers have proven to be particularly advantageous in different external stimuli and possible material systems. [ 10 ] Thus, herein, inspired by G. viridula 's feet setae and pigeons’ migration behaviors, we bionically constructed a superaerophobic flexible magnetic microcilia array (FMMA) surface for gas bubbles controllable transport. Under the action of external magnetic field, the flexible cilia can bend toward the center of the magnet to form a tiny concave.…”

Section: Introductionmentioning

confidence: 99%

Underwater Directional and Continuous Manipulation of Gas Bubbles on Superaerophobic Magnetically Responsive Microcilia Array

Ben

Ning

Zhao

et al. 2022

Adv Funct Materials

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The manipulation of underwater bubbles is of great significance in scientific research and industrial applications since they are ubiquitous and inevitable in production and life, for example, in agriculture and industry processes. Unfortunately, in an aqueous environment, the bubbles are mainly dominated by buoyancy and move upward, which makes the manipulation of bubbles difficult. To this end, numerous materials have been designed to manipulate bubbles. However, almost all of the existing materials are based on the superaerophilic surface, which has low controllability of bubble and cannot switch the transport velocity. Therefore, realizing the efficient, non-destructive, and reversible manipulation of bubbles remains a great challenge. Herein, a novel strategy combining the superaerophobic wettability with magnetic response microcilia structure surface to achieve efficient, lossless, and reversible manipulation of bubbles is proposed. The surface can not only realize the non-destructive manipulation of bubbles with different volumes, but also adjust the bubble transport velocity by adjusting the magnetic field. This study provides a reference for the application of bubbles in more fields and provides a basis for the development and research of expanding the application of microfluidic technology in the future.

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“…[3][4][5][6] Among different external stimuli and possible material systems, tunability and control of magnetoactive elastomers (MAEs) by magnetic fields have been shown to be particularly useful. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] MAEs can be classified as hybrid materials comprising micrometer-sized ferromagnetic particles embedded into a polymer matrix. [24] Upon exposure to a magnetic field, their physical properties can significantly change.…”

mentioning

confidence: 99%

Laser Micromachining of Magnetoactive Elastomers as Enabling Technology for Magnetoresponsive Surfaces

Kravanja

Belyaeva

Hribar

et al. 2021

Adv Materials Technologies

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A simple method for structuring of the surface of a magnetoactive elastomer (MAE) on the tens of micrometers scale, which capabilities extend beyond conventional mold‐based polymer casting, is reported. The method relies on the ablation of the material by absorption of nanosecond infrared pulses from a commercial laser. It is shown that it is possible to fabricate parallel lamellar structures with a high aspect ratio (up to 6:1) as well as structures with complex scanning trajectories. The method is fast (fabrication time for the 7 × 7 mm2 is about 60 s), and the results are highly reproducible. To illustrate the capabilities of the fabrication method, both orthogonal to the MAE surface and tilted lamellar structures are fabricated. These magnetosensitive lamellae can be easily bent by ±45° using an external magnetic field of about 230 mT. It is demonstrated that this bending allows one to control the sliding angle of water droplets in a great range between a sticky (>90°) and a sliding state (<20°). Perspectives on employing this fabrication technology for magnetosensitive smart surfaces in microfluidic devices and soft robotics are discussed.

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Tunable Drop Splashing on Magnetoactive Elastomers

Cited by 10 publications

References 51 publications

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers

Underwater Directional and Continuous Manipulation of Gas Bubbles on Superaerophobic Magnetically Responsive Microcilia Array

Laser Micromachining of Magnetoactive Elastomers as Enabling Technology for Magnetoresponsive Surfaces

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