AI Article Synopsis
- ZrB-based ceramics have potential for use in extreme environments, surpassing traditional silicon- and oxide-based materials for aerospace applications.
- A new bionic microstructure inspired by peacock barbules enables these ceramics to effectively dissipate electromagnetic waves (EMW) by incorporating boron nitride nanotubes as polarization centers.
- The modified ceramic exhibits ultra-broadband absorption capabilities, drastically reducing EMW reflection and achieving strong absorption across a wide frequency range of 2-40 GHz.
Article Abstract
Broadband electromagnetic wave (EMW) absorbing ceramic materials are highly required for the thermal parts of aerocraft. As members of ultrahigh temperature ceramics, ZrB-based ceramics have great potential for applications in more extreme environments relative to the currently used silicon-based and oxide-based ceramics. However, ZrB is not among the traditional EMW absorbing material candidates due to its high conductivity, which induces the strong reflection of EMW due to the impedance mismatch with free space. Herein, ZrB-based ceramic with a bionic microstructure inspired by peacock barbules is proposed. Boron nitride nanotubes acting as polarization centers inside the ZrB-based material cause massive EMW dissipation. The ceramic shows an ultra-broadband absorption of 9.6 GHz (<-10 dB from 8.4 to 18 GHz), almost covering the entire X and Ku bands, superior to the reported ceramics. The polarization centers successfully turn the ZrB-based ceramic from EMW reflecting material to an excellent EMW absorbing material by the bionic barbule interspersed microstructure. The simulated metamaterial of the ceramic achieves an ultra-broad absorption (lower than -15 dB) in the range of 2-40 GHz. This work provides valuable insights for the development of broadband absorption material for high-temperature environments.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/smll.202405364 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unsupervised inter-domain transformation for virtually stained high-resolution mid-infrared photoacoustic microscopy using explainable deep learning.
Nat Commun
December 2024
Department of Convergence IT Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea.
Mid-infrared photoacoustic microscopy can capture biochemical information without staining. However, the long mid-infrared optical wavelengths make the spatial resolution of photoacoustic microscopy significantly poorer than that of conventional confocal fluorescence microscopy. Here, we demonstrate an explainable deep learning-based unsupervised inter-domain transformation of low-resolution unlabeled mid-infrared photoacoustic microscopy images into confocal-like virtually fluorescence-stained high-resolution images.
View Article and Find Full Text PDFInfrared thermal modulation endoscopy for label-free tumor detection.
Sci Rep
December 2024
Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea.
In optical imaging of solid tumors, signal contrasts derived from inherent tissue temperature differences have been employed to distinguish tumor masses from surrounding tissue. Moreover, with the advancement of active infrared imaging, dynamic thermal characteristics in response to exogenous thermal modulation (heating and cooling) have been proposed as novel measures of tumor assessment. Contrast factors such as the average rate of temperature changes and thermal recovery time constants have been investigated through an active thermal modulation imaging approach, yielding promising tumor characterization results in a xenograft mouse model.
View Article and Find Full Text PDFHidden route of protein damage through oxygen-confined photooxidation.
Nat Commun
December 2024
Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.
Oxidative modifications can disrupt protein folds and functions, and are strongly associated with human aging and diseases. Conventional oxidation pathways typically involve the free diffusion of reactive oxygen species (ROS), which primarily attack the protein surface. Yet, it remains unclear whether and how internal protein folds capable of trapping oxygen (O) contribute to oxidative damage.
View Article and Find Full Text PDFLight-dependent modulation of protein localization and function in living bacteria cells.
Nat Commun
December 2024
Department of Biophysics & Biophysical Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.
Most bacteria lack membrane-enclosed organelles and rely on macromolecular scaffolds at different subcellular locations to recruit proteins for specific functions. Here, we demonstrate that the optogenetic CRY2-CIB1 system from Arabidopsis thaliana can be used to rapidly direct proteins to different subcellular locations with varying efficiencies in live Escherichia coli cells, including the nucleoid, the cell pole, the membrane, and the midcell division plane. Such light-induced re-localization can be used to rapidly inhibit cytokinesis in actively dividing E.
View Article and Find Full Text PDFDeep-learning enabled generalized inverse design of multi-port radio-frequency and sub-terahertz passives and integrated circuits.
Nat Commun
December 2024
Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ, USA.
Millimeter-wave and terahertz integrated circuits and chips are expected to serve as the backbone for future wireless networks and high resolution sensing. However, design of these integrated circuits and chips can be quite complex, requiring years of human expertise, careful tailoring of hand crafted circuit topologies and co-design with parameterized and pre-selected templates of electromagnetic structures. These structures (radiative and non-radiative, single-port and multi-ports) are subsequently optimized through ad-hoc methods and parameter sweeps.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!