Characterisation of the magnetic response of nanoscale magnetic filaments in applied fields

Abstract

<p>Magnetic filaments are to be designed by selecting crosslinking mechanisms rather than by choice of ferro- or super-paramagnetic monomers.</p>

Synthesis of Magnetite Nanoparticles through a Lab-On-Chip Device

“…As the saturation magnetization decreases with size, MNPs are categorized into superparamagnetic iron oxide nanoparticles, ultrasmall superparamagnetic iron oxide nanoparticles, and monocrystalline iron oxide nanoparticles, a subset of ultrasmall superparamagnetic iron oxide nanoparticles. Therefore, the size represents a fundamental factor that determines the magnetic properties and the consequent response to magnetic fields of MNPs [ 13 , 15 ]. Furthermore, within the biomedical field, size influences the filtration, blood circulation time, and cellular uptake of MNPs [ 12 , 13 , 16 , 17 ].…”

Rheology of a Nanopolymer Synthesized through Directional Assembly of DNA Nanochambers, for Magnetic Applications

“…Long-range magnetic interparticle interactions are accounted for via the standard dipole–dipole pair potential: where the intermonomer distance is , and is the displacement vector connecting the i and j monomer center-of-mass with dipole moments and , respectively. Zeeman interactions coming from the presence of an external magnetic field H⃗ are realized via the Zeeman coupling potential: To model the phenomenology of superparamagnetic MNPs accurately, we use the approach presented in Mostarac et al 79 One needs to calculate the total field in each point of the system. The total magnetic field is the sum of H⃗ and the dipole field .…”

Programming the microstructure of magnetic nanocomposites in DLP 3D printing

“…Here, the reference system (60Eb40BA_3NPs_30mT) is represented by the black continuous line in Figure 3.a, and shows an aspect ratio at the plateau of about 4. As the magnetic field is the driving force for the self-assembly process [89][90][91], its influence is first analyzed. When the applied field is reduced to 6 mT, any other quantity otherwise equal, the aspect ratio of the chains (green line in Figure 3.a) is reduced to 1.2, i.e.…”

“…this value is about 70 % smaller than in the reference system. As the strength of dipolar interactions between NPs scale with the intensity of the applied field, reducing B weakens the interactions between the aggregates, which in turn results in shorter structures [90,[92][93][94]. This is, in low field conditions, chains attract less efficiently surrounding aggregates in head-to-tail configuration compared to the structures formed under stronger magnetic fields.…”