A5002332678- Characterization and Applications of Magnetic Nanoparticles
- Electrostatics and Colloid Interactions
- Lattice Boltzmann Simulation Studies
- Material Dynamics and Properties
- Geomagnetism and Paleomagnetism Studies
- Hydrogels: synthesis, properties, applications
- Rheology and Fluid Dynamics Studies
- Microfluidic and Bio-sensing Technologies
- Vibration Control and Rheological Fluids
- Particle Dynamics in Fluid Flows
- Advanced Materials and Mechanics
- Scientific Computing and Data Management
- Magnetic and Electromagnetic Effects
- Coagulation and Flocculation Studies
- Theoretical and Computational Physics
- Pickering emulsions and particle stabilization
- Research Data Management Practices
- nanoparticles nucleation surface interactions
- Blood properties and coagulation
- Fluid Dynamics and Turbulent Flows
- Block Copolymer Self-Assembly
- Atomic and Subatomic Physics Research
- Polymer Nanocomposites and Properties
- Biocrusts and Microbial Ecology
- IoT-based Smart Home Systems
University of Stuttgart
2013-2023
Stuttgart Observatory
2015-2020
Magnetic gels, so-called ferrogels, consist of a polymer network, into which magnetic nanoparticles are embedded. The interesting properties ferrogels originate from complex interplay the mechanical polymers with interactions embedded nanoparticles. ability to control system by an external field may give rise applications in medicine and engineering. In this paper, we propose examine two microscopical simulation models for 2D ferrogel suited explain distinct mechanisms deformation such...
Paramagnetic particle chains in soft polymer gels can show pronounced buckling deformation under perpendicular external magnetic fields.
In the past decades, ferrofluids have become relevant in many applications ranging from engineering to medicine, and attracted interest of scientists fields. To understand physical mechanisms serving as a basis for these applications, over last properties been studied can now be controlled. However, order fine-tune various aspects interactions system hopefully – long run build tailored structures, recent years, magnetic nanoparticles colloids that deviate model spherical particle with dipole...
Ferrogels, i.e., swollen polymer networks into which magnetic particles are immersed, can be considered as "smart materials" since their shape and elasticity controlled by an external field. Using molecular dynamics simulations on the coarse-grained level, we study a ferrogel in act cross-linkers of network. In homogeneous field, direct coupling between orientation moments polymers means covalent bonds gives rise to deformation gel, independent interparticle dipole-dipole interaction. this...
<ns3:p>Research software has become a central asset in academic research. It optimizes existing and enables new research methods, implements embeds knowledge, constitutes an essential product itself. Research must be sustainable order to understand, replicate, reproduce, build upon or conduct effectively. In other words, available, discoverable, usable, adaptable needs, both now the future. therefore requires environment that supports sustainability.</ns3:p><ns3:p> </ns3:p><ns3:p> Hence,...
We present microrheological measurements of the drag force on colloids pulled through a solution λ-DNA (used here as monodisperse model polymer) with an optical tweezer. The experiments show that is larger than expected from Stokes formula and independently measured viscosity DNA solution. attribute this to accumulation in front colloid reduced density behind colloid. This hypothesis corroborated by simple drift-diffusion for molecules, which reproduces experimental data surprisingly well,...
Ferrogels and magnetic elastomers differentiate themselves from other materials by their unique capability of reversibly changing shape mechanical properties under the influence an external field. A crucial issue in study these outstanding is interaction between mesoscopic particles polymer matrix which they are embedded. Here we analyze interactions two such connected a chain, situation representative for particle-crosslinked gels. To make first step towards scale-bridging description...
Research software has become a central asset in academic research. It optimizes existing and enables new research methods, implements embeds knowledge, constitutes an essential product itself. must be sustainable order to understand, replicate, reproduce, build upon or conduct effectively. In other words, available, discoverable, usable, adaptable needs, both now the future. therefore requires environment that supports sustainability. Hence, change is needed way development maintenance are...
In this contribution we present computer simulation results on the cluster structures in systems, made of particles, with magnetic dipole moment shifted out from centre mass towards particles' surface. This additionally introduced anisotropy system strongly affects topology clusters at both low and finite temperatures. ground state intermediate dipolar shift range dimensionality plays a role due to possibilities for decreasing inter-dipolar distance. For larger shifts, practically does not...
We investigate the structure of a recently proposed magnetic fluid consisting shifted dipolar (SD) particles in an externally applied field via computer simulations. For standard fluids usually enhances dipole-dipole correlations and facilitates chain formation whereas present system effect external can result break-up clusters. thoroughly origin this phenomenon through analyzing first ground states SD-particle systems as function field. In second step we quantify microstructure these...
A user ready, well documented software package PyOIF contains an implementation of a robust validated computational model for cell flow modelling. The is capable simulating processes involving biological cells immersed in fluid. examples such are flows microfluidic channels with numerous applications as sorting, rare isolation or fractionation. Besides the typical usage design process devices, has been used computer-aided discovery mechanical properties membranes. With this software, single...
Magnetic nanoparticles couple to polymeric environments by several mechanisms. These include van der Waals, steric, hydrodynamic and electrostatic forces. This leads numerous interesting effects potential applications. Still, the details of coupling are often unknown. In a previous work, we showed that, for spherical particles, alone can explain experimentally observed trends in magnetic AC susceptibility spectra [P. Kreissl, C. Holm R. Weeber, Soft Matter, 2021, 17, 174-183]. Non-spherical,...
Optical tweezers are experimental tools with extraordinary resolution in positioning (± 1 nm) a micron-sized colloid and the measurement of forces 50 fN) acting on it—without any mechanical contact. This enables one to carry out multitude novel experiments nano- microfluidics, which following will be presented this review: (i) within single pairs colloids media varying concentration valency surrounding ionic solution, (ii) measurements electrophoretic mobility different solvents...
Nanoparticle agglomeration plays an important role in processes such as spray drying and particle flame synthesis. These have common that nanoparticles collide at low concentrations get irreversibly linked the point of contact due to plastic deformation. In this article, we investigate several models irreversible connections, which require only local interactions between colliding thus allow for scalable simulations. The investigated here connect particles upon collision by non-bonded...
Abstract Magnetic fields exhibit higher‐order, nonlinear singularities in the form of point‐dipole singularities. In addition, due to absence divergence, they feature only a subset invariant structures from traditional vector field topology. For magnetic sets point dipoles—widely present physics and often used as an approximation—we technique revealing topology flux. The flux is identified with areas covered by lines that directly connect pairs dipoles. We introduce dipole connectrix reduced...