TY - JOUR A1 - Kriegl, Raphael A1 - Krenkel, Lars A1 - Shamonin (Chamonine), Mikhail T1 - Preservation of wetting ridges using field-induced plasticity of magnetoactive elastomers JF - Journal of Colloid and Interface Science N2 - Hypothesis. The presence of a wetting ridge is crucial for many wetting phenomena on soft substrates. Conventional experimental observations of a wetting ridge require permanent presence of a droplet. The magnetic field-induced plasticity effect (FIPE) of soft magnetoative elastomers (MAEs) allows one to overcome this limitation. Depositing a droplet onto an MAE surface and applying a magnetic field fixes the wetting ridge in place due to the FIPE. The droplet can be removed to investigate the ridge with ease using conventional optical methods. Experiments. The wetting ridge is observed on MAEs with different shear moduli and different material thicknesses by confocal laser scanning microscopy (LSM). The preservation quality of the ridge is analyzed for several values of magnetic field from 10 mT to 270 mT. To verify the plausibilty of results obtained, the measured shape is compared to a theoretical model by Style & Dufresne. Findings. Upon removal of the sessile droplet, the deformation remains embossed onto the MAE surface as long as the magnetic field remains applied. The height of the ridge peak on soft samples (effective shear modulus kPa) is close to the theoretical prediction for a magnetic flux density of 50 mT. The magnitude of the external magnetic field magnifies the height of the wetting ridge. KW - Wetting ridge KW - Droplet KW - Magnetoactive elastomer KW - Magnetorheological elastomer KW - Field-induced plasticity KW - Confocal laser scanning microscopy Y1 - 2025 U6 - https://doi.org/10.1016/j.jcis.2024.12.132 SN - 0021-9797 N1 - Corresponding author der OTH Regensburg: Raphael Kriegl VL - 683 SP - 1019 EP - 1027 PB - Elsevier ER - TY - JOUR A1 - Roghani, Mehran A1 - Romeis, Dirk A1 - Glavan, Gašper A1 - Belyaeva, Inna A. A1 - Shamonin (Chamonine), Mikhail A1 - Saphiannikova, Marina T1 - Magnetically induced deformation of isotropic magnetoactive elastomers and its relation to the magnetorheological effect JF - Physical Review Applied N2 - Can isotropic magnetoactive elastomers (MAEs) undergo giant magnetically induced deformations and exhibit huge magnetorheological effects simultaneously? In this experimental and theoretical study, we reveal how the macroscopic deformation of MAEs relates to the process of particle restructuring caused by application of a magnetic field. For this purpose, MAE cylinders with different aspect ratios and particle loadings are studied in uniform magnetic fields. The axial deformations of the cylinders are acquired using an optical camera. A unified mean-field model proposed in previous studies is adapted to describe the transition of initially isotropic cylinders into transversely isotropic ones. This mechanical transition is caused by the rearrangement of particles into dense columnar structures aligned with the field and is believed to result in a huge magnetorheological effect. Our model however predicts less than a threefold increase in elastic moduli when evaluated along the field direction. This prediction is based on a careful examination of the shear moduli of studied MAEs and the columnar structures. A weak magnetorheological effect explains significant axial deformations measured in the field direction. A strong magnetorheological effect would hinder axial deformations due to an increase in the modulus by several orders of magnitude. Not only are the moduli and macroscopic deformations influenced by microstructure evolution, but so is the magnetization of particles, which increases as they rearrange into dense columns. With this study, we show that the unified mean-field model provides quantitative access to hidden material properties such as magnetization and stiffness in MAE samples with different shapes and evolving microstructures. Published by the American Physical Society 2025 Y1 - 2025 U6 - https://doi.org/10.1103/PhysRevApplied.23.034041 SN - 2331-7019 VL - 23 IS - 3 PB - American Physical Society (APS) ER - TY - GEN A1 - Glavan, Gašper A1 - Belyaeva, Inna A. A1 - Shamonin (Chamonine), Mikhail T1 - Multiferroic Cantilevers Containing a Magnetoactive Elastomer: Magnetoelectric Response to Low-Frequency Magnetic Fields of Triangular and Sinusoidal Waveform [Data set] Y1 - 2025 U6 - https://doi.org/10.5281/zenodo.14651784 N1 - This is the data set for all the figures in the paper with the title: "Multiferroic Cantilevers Containing a Magnetoactive Elastomer: Magnetoelectric Response to Low-Frequency Magnetic Fields of Triangular and Sinusoidal Waveform" published in the Sensor journal (doi:10.3390/s22103791). ER - TY - GEN A1 - Glavan, Gašper A1 - Belyaeva, Inna A. A1 - Shamonin (Chamonine), Mikhail A1 - Ruwisch, Kevin A1 - Wollschläger, Joachim T1 - Magnetoelectric Response of Laminated Cantilevers Comprising a Magnetoactive Elastomer and a Piezoelectric Polymer, in Pulsed Uniform Magnetic Fields [Data set] Y1 - 2025 U6 - https://doi.org/10.5281/zenodo.14652152 N1 - This is the data set for all the figures in the paper with the title: "Magnetoelectric Response of Laminated Cantilevers Comprising a Magnetoactive Elastomer and a Piezoelectric Polymer, in Pulsed Uniform Magnetic Fields" published in the Sensors journal (doi:10.3390/s21196390). ER - TY - JOUR A1 - Straus, Izidor A1 - Kravanja, Gaia A1 - Kriegl, Raphael A1 - Shamonin (Chamonine), Mikhail A1 - Drevenšek-Olenik, Irena A1 - Jezeršek, Matija A1 - Kokot, Gašper T1 - Laser Micromachining for Polymer Surface Topography Designt JF - JoVE journal : engineering N2 - Soft magnetoactive elastomers (MAEs) are smart materials that respond to external magnetic fields by dynamically altering their mechanical properties. They are composed of magnetically responsive microparticles embedded within a soft polymer matrix, exhibiting an effective shear modulus of up to 100 kPa. In recent decades, MAEs' bulk properties have been successfully exploited for applications such as dynamic vibration damping, vibration sensing, and actuation in soft robotics. Recent research has shifted to their surface properties, revealing promising results on tunable surface features such as roughness, adhesion, and wetting. Even the transport of small solid and fluid objects was demonstrated. The associated surface effects can be significantly enhanced through the precise engineering of surface topography. In this article, an efficient laser micromachining technique, with a resolution of 15 µm, is presented, which enables rapid prototyping of MAE surfaces. It allows the creation of various complex shapes and offers functionality beyond the one achievable with traditional molding techniques. Additionally, the approach is versatile and can be applied to any polymer that sufficiently absorbs the laser light. As an example, a lamellar surface micro-pattern fabrication process and its characterization by optical and scanning electron microscopies are shown. Its response to a magnetic field is demonstrated. The technique provides a flexible and fast solution for optimizing polymer surface design across a wide range of applications. Y1 - 2025 U6 - https://doi.org/10.3791/68126 PB - JoVE ER -