Magnetic Field-Assisted Orientation and Positioning of Magnetite for Flexible and Electrically Conductive Sensors

Micromachines, Journal Year: 2025, Volume and Issue: 16(1), P. 68 - 68

Published: Jan. 8, 2025

Magnetic field-assisted control of magnetite location is a promising strategy for developing flexible, electrically conductive sensors with enhanced performance and adjustable properties. This study investigates the effect static magnetic fields applied on thermoplastic elastomer (TPE) composites multi-walled carbon nanotubes (MWCNT). The were prepared by compression moulding field was mould cavity during processing. Composites range concentrations (1, 3, 6 wt.%) MWCNT (1 3 wt.%). particle concentration composite viscosity investigated. Rheological analysis showed that MWCNTs significantly increased while had minimal impact, ensuring stable processing facilitating orientation under field. Particle electrical conductivity evaluated different temperatures. application at 190 °C magnetite/MWCNT interactions, substantially reducing resistivity preserving thermal stability. no degradation 220 above, demonstrating suitability high-temperature applications requiring resilience. Furthermore, magnetite's response facilitated precise sensor positioning strong adhesion to polyimide substrates °C. These findings demonstrate scalable adaptable approach enhancing positioning, broad potential in flexible electronics.

Language: Английский

Liquid Metal-Ionogel Core–Shell Fibers for Reflection-Suppressed Electromagnetic Interference Shielding and Strain Sensing

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 28, 2025

Electromagnetic interference (EMI) shielding fibers are crucial in practical uses for their flexibility and one-dimensional form. However, application is limited by poor compatibility between EMI components fiber substrates, high electromagnetic wave reflectivity. Herein, a core/shell-structured introduced, featuring core of Ga-In-Sn-Zn alloy, Carbopol, air bubbles, shell ionogel formed from copolymerized acrylamide acrylic acid. A single achieves total effectiveness ∼35 dB within the 2-18 GHz range, which increases to ∼70 when three stacked. Remarkably, demonstrates enhanced performance following stretching recovery. Additionally, it exhibits excellent impedance matching, with reflection power coefficient as low 0.14 at 10 GHz. The fiber's mechanism encompasses shielding, absorption shielding─attributable conduction loss polarization loss─and multiple shielding. Furthermore, shows potential strain sensor. This research offers an effective strategy creating flexible capabilities EM reflection.

Language: Английский

An Investigation into Fe3O4 Nanoparticle-Based Composites for Enhanced Electromagnetic Radiation Shielding

Journal of Composites Science, Journal Year: 2025, Volume and Issue: 9(5), P. 226 - 226

Published: April 30, 2025

In both fundamental and applied scientific exploration, nanostructured protective materials have garnered substantial interest owing to their multifaceted utilization in the fields of medicine, pharmaceuticals, electronics, among others. This study investigated evolution cutting-edge for electromagnetic radiation attenuation, with a specific emphasis on incorporation superparamagnetic magnetite nanoparticles, Fe3O4, into composite systems. The nanoparticles were generated through chemical condensation, meticulously adjusting proportions iron salts, specifically FeSO4·7H2O FeCl3·6H2O, conjunction 25% aqueous solution ammonia, NH4OH·H2O. examined intricate details crystalline structure, precise composition phases, physicochemical attributes these synthesized Fe3O4 nanoparticles. analysis was conducted employing suite advanced techniques, including scanning electron microscopy (SEM), transmission (TEM), X-ray diffraction (XRD), energy-dispersive (EDAX). key findings this research suggest that magnetic condensation an average size between 10 11 nm. determined using BET surface area measurements, which within 0.1 Moreover, demonstrated incorporating significantly reduces microwave radiation. particular, optimal concentration 0.25% by weight leads maximum decrease 21.7 dB cement specimens measuring mm thickness. critical threshold 0.5 percent is established, beyond interactions inhibit process remagnetization. These investigations demonstrate it feasible pursue route towards development highly effective shielding tailored requirements diverse applications.

Language: Английский