Programmable microwire composites: from functional units to material design

Abstract

Microwire composites possess a wide range of functionalities that can be actively manipulated by magnetic field/stress stimuli or hybridization. Beyond those strategies, here we focus on programming microwave response by designing the wire functional units and assembling them in a specific arrangement. The programming was based on a code type defined by structural relaxation and electromagnetic damping and on a code pattern by wave attenuation, effective conductivity and near-field interaction effects. Structural relaxation was achieved by current annealing the wires, which was reflected in changes in Curie temperature, structural, magnetic and electrical properties. The wave propagation mapped by the transmission coefficient was manipulated by the wire concentration and periodicity and by arrangement of as-cast and annealed wires in their array. Increasing the wire concentration blueshifted the transmission band of the wire composites due to larger conductivity, while decreasing the wire periodicity redshifted the band owing to stronger inter-wire coupling. A larger blueshift was obtained by alternating as-cast and annealed wires due to an overlapped flow closure of fields from the same type of wire in the array. Our strategy demonstrates that macroscopic properties of wire composites can be effectively programmed from a material structure/unit arrangement perspective. This concept promotes deeper understanding of high-frequency properties and further expands the applications of fiber-reinforced composites in fields such as information, energy and security technologies.

Marangoni forced convective Casson type nanofluid flow in the presence of Lorentz force generated by Riga plate

“…Mahantesh et al [19] investigated thermal Marangoni convective two phase flow. Some closely related and interesting articles can also be seen in [45], [44], [41], [43], [42].…”

Electrical Insulation and Radar-Wave Absorption Performances of Nanoferrite/Liquid-Silicone-Rubber Composites

“…Carbon-based composites of silicon carbide nanowires of 20~60 nm diameter coated with graphene achieve a minimum reflection loss of −16.2 dB and an effective absorption bandwidth of 2.64 GHz [ 28 ]. Microwire composites have been demonstrated to be flexibly manipulated for modifying microwave response by magnetic field/stress stimuli or hybridization and by assembling wire functional units in a specific arrangement, which expands the applications of fiber-reinforced composites in fields such as information, energy, and security technologies [ 29 ].…”

Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites

“…Beyond those methods, we have recently proposed a programming-based strategy using the microwire (microstructurally modified by current annealing) as a code unit and different wire combinations as the code pattern [9,10]. Although such approach enabled the modulation of scattering properties to a large extent, strategies other than increasing the number of components and modifying microstructure have not yet been exploited.…”