Dirk Romeis
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View article: Magnetically induced deformation of isotropic magnetoactive elastomers and its relation to the magnetorheological effect
Magnetically induced deformation of isotropic magnetoactive elastomers and its relation to the magnetorheological effect Open
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…
View article: Magnetically induced deformation of isotropic magneto-active elastomers and its relation to the magnetorheological effect
Magnetically induced deformation of isotropic magneto-active elastomers and its relation to the magnetorheological effect Open
Can isotropic Magneto-Active Elastomers (MAEs) undergo giant magnetically induced deformations and exhibit huge magnetorheological effects simultaneously? In this experimental and theoretical study, we reveal how the macroscopic deformatio…
View article: Influence of matrix stiffness on microstructure evolution and magnetization of magneto-active elastomers
Influence of matrix stiffness on microstructure evolution and magnetization of magneto-active elastomers Open
The presented unified mean-field model predicts the magnetization behavior of Magneto-Active Elastomer (MAE) disks with different matrix stiffness undergoing microstructure evolution in agreement with experiment.
View article: Effect of microstructure evolution on the mechanical behavior of magneto-active elastomers with different matrix stiffness
Effect of microstructure evolution on the mechanical behavior of magneto-active elastomers with different matrix stiffness Open
We present an effective model, that in agreement with experiments, predicts a huge increase in the stiffness of soft MAEs, due to the formation of columnar structures from magnetized particles.
View article: Effective magnetic susceptibility in magnetoactive composites
Effective magnetic susceptibility in magnetoactive composites Open
Describing macroscopic samples made of composite material requires the development of an effective macro-continuum model where properties and microscopic arrangement of distinct phases are adequately taken into account. Here, we derive the…
View article: Theoretical analysis of the elastic free energy contributions to polymer brushes in poor solvent: A refined mean-field theory
Theoretical analysis of the elastic free energy contributions to polymer brushes in poor solvent: A refined mean-field theory Open
We consider polymer brushes in poor solvent that are grafted onto planar substrates and onto the internal and external surfaces of a cylinder using molecular dynamics simulation, self-consistent field (SCF), and mean-field theory. We deriv…
View article: Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures
Magneto-Mechanical Enhancement of Elastic Moduli in Magnetoactive Elastomers with Anisotropic Microstructures Open
Magnetoactive elastomers (MAEs) have gained significant attention in recent years due to their wide range of engineering applications. This paper investigates the important interplay between the particle microstructure and the sample shape…
View article: Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers
Field-Induced Transversely Isotropic Shear Response of Ellipsoidal Magnetoactive Elastomers Open
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…
View article: A Cascading Mean-Field Approach to the Calculation of Magnetization Fields in Magnetoactive Elastomers
A Cascading Mean-Field Approach to the Calculation of Magnetization Fields in Magnetoactive Elastomers Open
We consider magnetoactive elastomer samples based on the elastic matrix and magnetizable particle inclusions. The application of an external magnetic field to such composite samples causes the magnetization of particles, which start to int…
View article: Magneto-Mechanical Coupling in Magneto-Active Elastomers
Magneto-Mechanical Coupling in Magneto-Active Elastomers Open
In the present work, the magneto-mechanical coupling in magneto-active elastomers is investigated from two different modeling perspectives: a micro-continuum and a particle–interaction approach. Since both strategies differ significantly i…
View article: Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields
Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields Open
Elongations of magnetoactive elastomers (MAEs) under ascending–descending uniform magnetic fields were studied experimentally using a laboratory apparatus specifically designed to measure large extensional strains (up to 20%) in compliant …
View article: Linear and ring polymers in confined geometries
Linear and ring polymers in confined geometries Open
A short overview of the theoretical and experimental works on the polymer-colloid mixtures is given. The behaviour of a dilute solution of linear and ring polymers in confined geometries like slit of two parallel walls or in the solution o…