Metal-C core-shell nanoparticles have been recently demonstrated to be promising candidates for microwave absorption applications. However, the underlying absorption mechanism, such as the contributions of the metal cores and C shells on their absorption performance, remains far from clear due to the complicated interfaces and synergetic effects between metal cores and C shells, as well as the significant challenges in the preparation of samples with well-defined comparability. In this study, Cu-C core-shell nanoparticles and their derivatives, i.e., bare Cu and hollow C nanoparticles, were synthesized for a comparative study on their microwave absorption properties. Electric energy loss models of the three samples were established, and based on these models, the comparative study suggested that the polarization loss could be significantly improved by C shells, and Cu cores had negligible influences on the conduction loss of Cu-C core-shell nanoparticles. The interface between C shells and Cu cores tuned the conduction loss and polarization loss to establish improved impedance matching and achieve optimal microwave absorption performances. A wide effective bandwidth of 5.4 GHz and a low reflection loss of -42.6 dB were achieved for Cu-C core-shell nanoparticles. This work provides new insights into how metal nanocores and C nanoshells affect the microwave absorption of core-shell nanostructures from experimental and theoretical points of view, which has reference values for the construction of highly efficient metal-C-based absorbers.
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http://dx.doi.org/10.1021/acs.inorgchem.2c04477 | DOI Listing |
Food Chem
December 2024
Laboratory of Applied Food Chemistry, Microbiology and Process Engineering, Centre for Food Engineering and Technology, Department of Chemical Engineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand 835215, India. Electronic address:
This study presents a novel gelatinization-induced whole-grain rice fortification (GIWGRF) technology using a microwave-assisted screw conveying spraying and drying setup (MASCSD). The process involves microwave-assisted soaking of pregelatinized rice in a micronutrient solution, followed by steam-assisted gelatinization and drying. Rice with an initial degree of gelatinization (DG) of 58.
View Article and Find Full Text PDFAdv Colloid Interface Sci
December 2024
Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India. Electronic address:
Heightened levels of electromagnetic (EM) radiation emitted by electronic devices, communication equipment, and information processing technologies have become a significant concern recently. So, substantial efforts have been devoted for developing novel materials having high EM absorption properties. This critical review article provides an overview of the advancements in understanding and developing such materials.
View Article and Find Full Text PDFNano Lett
December 2024
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.
Modern detection technology has driven camouflage technology toward multispectral compatibility and dynamic regulation. However, developing such stealth technologies is challenging due to different frequency-band principles. Here, this work proposes a design concept for a fluid-actuated multispectral compatible smart stealth device that employs a deformable mechanochromic layer/elastomer with a channeled dielectric layer.
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December 2024
Key Laboratory of Advanced Materials for Facility Agriculture, Ministry of Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Given the limitations of single-function electromagnetic wave-absorbing materials (EWAMs) in meeting the evolving demands of complex usage scenarios, there is a growing need for structure-function integrated composites that offer a combination of microwave absorption, human monitoring, and thermal insulation. This study successfully synthesized two-dimensional (2D) TiCT MXene via selective etching of Al from the TiAlC MAX phase. By introducing MXene into a composite of hydroxylated CoFeO nanoparticles (-CFO NPs) and bacterial nanocellulose (BNC) to modulate the electromagnetic performance of the EWAMs.
View Article and Find Full Text PDFNanotechnology
December 2024
FSBIS Kutateladze Institute of Thermophysics SB RAS, 1, Ac. Lavrentieva ave., Novosibirsk, 630090, RUSSIAN FEDERATION.
This paper proposes a simple and easily scalable method for the production of buckypapers. Buckypapers are made by airbrushing a suspension of dispersed SWCNTs onto a PET substrate, followed by solvent evaporation. The process does not require sophisticated equipment and is technologically straightforward.
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