The use of contactless magnetic forces meets numerous needs in microelectromechanical systems (MEMS) or microfluidic devices. In this view, heterogeneous materials integrating magnetic nanostructures within a non-magnetic matrix such as polymer can produce local variations of magnetic field, at the sub-micrometer scale. Here we report on the synthesis of magnetic composites using electrospun nanofilaments and a polydimethylsiloxane (PDMS) matrix. Varying the precursor nature and heat treatment conditions, we obtained single phase filaments of Fe, FeNi, and MFeO (M = Co, Fe, Ni). Thanks to a fine investigation of their structure and morphology, it was possible to measure from magnetically-soft (µH ⩽ 5 mT) to relatively hard (µH up to 93 mT, M/M up to 0.5) behaviors. The common one-dimensional shape of these filaments leads to an anisotropic magnetic response. This can be exploited to achieve self-organization of the filaments in arrays within the non-magnetic matrix. We show the first step towards the development of magnetically anisotropic membranes of PDMS with 0.23 wt% Fe filaments. These composite materials are promising for implementing magnetic functions in microsystems while circumventing complex micro-fabrication steps.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/1361-6528/ab9b46 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mechanosynthesis of fluorescent magnetic alumina for latent fingerprint detection.
J Colloid Interface Sci
January 2025
iBB-Institute for Bioengineering and Biosciences and i4HB-Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Bioengineering Department, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
A green approach towards the synthesis of both conventional and magnetic fluorescent powders for revealing latent fingerprints (FPs) is disclosed. The powders formulation is based on a biodegradable matrix and fluorescent dyes extracted from commercial felt-tip markers. Two classes of powders are described: one with a fluorescent component, and other with both fluorescent and magnetic components.
View Article and Find Full Text PDFWorkflow of the zero-fluoro pulsed field ablation.
J Arrhythm
December 2024
Division of Cardiology, Department of Medicine Nihon University School of Medicine Tokyo Japan.
Background: Zero-fluoroscopic pulsed field ablation (PFA) is the next step in advancing pulmonary vein isolation (PVI) for atrial fibrillation (AF).
Methods: A workflow incorporating a variable-loop circular PFA catheter, intracardiac echocardiography (ICE), and a visualized sheath was applied to 15 paroxysmal AF patients.
Results: It consisted of three steps: (1) positioning a non-magnetic mapping catheter in the coronary sinus after creating a right atrial matrix, (2) transseptal puncture with the sheath advancement to the left atrium under ICE guidance, and (3) PFA confirming catheter-tissue contact with tissue proximity indication.
Synergistic Effects of BaTiO and MFeO (M = Mn, Ni, Cu, Zn, and Co) Nanoparticles as Artificial Pinning Centers on the Performance of YBaCuO Superconductor.
Nanomaterials (Basel)
November 2024
Department of Biophysics, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
Large-scale superconductor applications necessitate a superconducting matrix with pinning sites (PSs) that immobilize vortices at elevated temperatures and magnetic fields. While previous works focused on the single addition of nanoparticles, the simultaneous inclusion of different nanoparticles into a superconducting matrix can be an effective way to achieve an improved flux pinning capacity. The purpose of this study is to explore the influence of mixed-nanoparticle pinning, with the co-addition of non-magnetic (BaTiO; BT) and various types of magnetic spinel ferrite (MFeO, abbreviated as MFO, where M = Mn, Co, Cu, Zn, and Ni) nanoparticles, on the superconductivity and flux pinning performances of the high-temperature superconductor YBaCuO (YBCO).
View Article and Find Full Text PDFInfluence of aging, morphology and particle size on the behavior of microplastics during magnetic seeded filtration.
Sci Total Environ
December 2024
Karlsruhe Institute of Technology, Institute of Mechanical Process Engineering and Mechanics, Strasse am Forum 8, 76131 Karlsruhe, Germany.
Magnetic seeded filtration (MSF) is a solid-liquid separation process based on the formation of hetero-agglomerates between target (non-magnetic) particles and added magnetic particles, followed by magnetic separation. Previous experimental studies reported high separation efficiencies for hydrophobic microplastic particles (MP) and focused mainly on the polymer type. This study investigates the influence of the particle size, morphology and aging on the separation efficiency of different polymer types.
View Article and Find Full Text PDFThe impact of cross-linker distribution on magnetic nanogels: encapsulation, transport and controlled release of the tracer.
Soft Matter
November 2024
Faculty of Physics, University of Vienna, Kolingasse 14-16, Vienna 1090, Austria.
Magnetic nanogels (MNGs) are highly attractive for biomedical applications because of their potential for remote control of the rheology and internal structure of these soft colloids with biocompatible magnetic fields. In this contribution, using molecular dynamics simulations, we investigate the impact of the cross-linker distribution in the body of a MNG on the shape and magnetic response to constant and AC magnetic fields and relate those properties to the behaviour of non-magnetic tracers placed in the MNGs and left to escape. We find that if no AC magnetic field is applied, although the escape times of the tracer particles barely depend on morphology, the highest degree of subdiffusion is observed for the gels with a non-uniform cross-linkerer distribution.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!