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‘Electret Integrated Magnetic Field Sensor Based On Magnetostrictive Polymer Composite With NT Resolution – Nature.com’

Nature.com Jan 10, 2025

The pursuit for advanced magnetoelectric field sensors has gained momentum driven by applications in various fields ranging from biomedical applications to soft robotics and the automotive sector. In this context a capacitive read-out based magnetostrictive polymer composite MPC sensor element is introduced offering a new perspective on magnetic field detection. The sensor element8217s unique feature is the possibility to independently tailor its mechanical and magnetic properties. When compared to other composite-based magnetic field sensors the limit of detection LoD is three orders of magnitude lower 95.6 nT8730Hz at a resonance frequency of 160.5ampnbspHz. In contrast to other electret-based ME sensors the LoD is reduced by a factor of 20. To the best of the authors8217 knowledge this work marks the first comprehensive attempt to characterize a sensor magnetically aligning with the thorough assessment standards of ME sensors. This study aims to narrow the disparity between established magnetic field sensors featuring consistent characterization protocols and the novel MPC sensors which often undergo limited magnetic characterization as part of their evaluation. The presented sensor built from readily available materials offers a versatile and tuneable platform for magnetic field detection and ongoing research aims to unlock its full potential in diverse applications.

‘Efficient Recovery Of Carbon Fibers From Carbon Fiber-reinforced Polymers Using Direct Discharge Electrical Pulses – Nature.com’

Nature.com Nov 30, 2024

Carbon fiber-reinforced polymers CFRPs are lightweight high-strength composite materials that are widely used in various industries. However recycling CFRPs remains a significant challenge because of the difficulty in separating carbon fibers CFs from the polymer matrix. This study compares two electrical pulse methods namely direct discharge DD and electrohydraulic fragmentation EHF for the energy-efficient and precise recovery of CFs from CFRPs. The DD method involves the direct application of high-voltage pulses to the CFRPs leveraging the Joule heat generation thermal stress generation and expansion force caused by plasma generation. In contrast EHF is based on intensive shockwave impulses generated by high-voltage discharge plasmas along the interfaces of different materials. We examined the physical properties of the recovered CFs namely their length tensile strength resin adhesion and structural degradation as well as the energy efficiency of the two methods in terms of CF separation. The results showed that DD is more effective for CF recovery considering the preservation of long fibers with high strength and the separation of individual fibers without residual resin on the surface.