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Gradient Porous and Carbon Black-Integrated Cellulose Acetate Aerogel for Scalable Radiative Cooling.
Small
January 2025
School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea.
Passive temperature controls like passive daytime radiative cooling (PDRC)-heating (PDRH), and thermal insulation are essential to meet the growing demand for energy-efficient thermal solutions. When combined with advanced functions like electromagnetic interference shielding, these technologies can significantly enhance scalability. However, existing approaches using single thin films or uniform porous materials face inherent limitations in optimizing versatile functions, while lightweight, insulating aerogels can extend their multifunctionality by manipulating pores and fillers.
View Article and Find Full Text PDFRegulating Growth Kinetics of Carbon Nanotubes Toward Efficient Microwave Absorption.
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December 2024
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China.
Carbon nanotubes (CNTs) show great promise for microwave absorption (MA) due to their excellent electrical conductivity and lightweight properties, which are conferred by the one dimensional hollow tubular structure. However, the ambiguous intrinsic motivations behind the formation of CNTs and the intricate growth processes have resulted in a lack of a systematic methodology for precisely controlling their electromagnetic properties. Herein, a flexible CNTs regulation strategy is designed to develop, with the core focus being the directional growth of carbon atoms and the differential catalysis of metal sources.
View Article and Find Full Text PDFGuided and Space Waves Multiplexed Metasurface for Advanced Electromagnetic Functionalities in Microwave Region.
Adv Mater
December 2024
Advanced Microscopy and Instrumentation Research Center, Harbin Institute of Technology, Harbin, 150080, P. R. China.
Nowadays, metasurfaces have attracted considerable attention due to their promising and advanced control of electromagnetic (EM) waves. However, it is still challenging to shape guided waves into desired free-space mode, while simultaneously manipulating spatial incident waves using a single metasurface. Herein, a class of metasurfaces capable of multiplexing guided and space waves is proposed to achieve advanced EM functionalities in microwave regions, which can find great application potentials in radar systems, wireless communications, and wireless power transfer (WPT).
View Article and Find Full Text PDFArticle Synopsis
- The demand for advanced camouflage technology in military warfare is rising, particularly for materials that have multispectral compatibility and adaptive capabilities.
- Achieving simultaneous multispectral functionality in one device is difficult due to the limitations in how electromagnetic waves respond across different wavelengths.
- The integration of coding metamaterials with infrared electrochromic devices leads to a new type of metadevice that allows for adjustable infrared emissivity and significant microwave scattering reduction, presenting a promising approach for future multispectral camouflage solutions.
A spin-refrigerated cavity quantum electrodynamic sensor.
Nat Commun
November 2024
Massachusetts Institute of Technology, Cambridge, MA, USA.
Quantum sensors based on solid-state defects, in particular nitrogen-vacancy (NV) centers in diamond, enable precise measurement of magnetic fields, temperature, rotation, and electric fields. Cavity quantum electrodynamic (cQED) readout, in which an NV ensemble is hybridized with a microwave mode, can overcome limitations in optical spin detection and has resulted in leading magnetic sensitivities at the pT-level. This approach, however, remains far from the intrinsic spin-projection noise limit due to thermal Johnson-Nyquist noise and spin saturation effects.
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