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35. Cellulose Metamaterials with Hetero‐Profiled Topology via Structure Rearrangement During Ball Milling for Daytime Radiative Cooling.

Author

Cai, Chenyang, Wu, Xiaodan, Cheng, Fulin, Ding, Chunxiang, Wei, Zechang, Wang, Xuan, and Fu, Yu

Subjects
*OPTICAL materials, *PHOTONIC crystals, *OUTER space, *MECHANICAL chemistry, *OPTICAL properties, *METAMATERIALS
Abstract

Passive radiative cooling is a zero‐energy consumption approach, which can dissipate heat to outer space by emitting infrared radiation through the transparency window. Traditional cooling materials, such as photonic films, metafabrics, and polymer foams, still suffer from complex preparation processes and high costs. In this work, it is reported that natural cellulose can be converted into a "green" optical metamaterial by rational structure reconfiguration at the micro/nano level via scalable ball milling technology for efficient daytime radiative cooling. Specifically, fine‐tuning the shearing kinetics in the mechanochemistry process, cellulosic optical metamaterial (COM) with ≈98% solar reflectivity and ≈0.97 infrared emissivity has been successfully achieved, which can break through the theoretical value of photonic crystals as well as the conventional synthetic optical materials. The COMSOL simulation reveals that the excellent optical properties of the cellulose metamaterial are explained by the "confined scattering" effect caused by the rearranged heterostructure at the micro/nano level. Outdoor tests demonstrat that the COM‐based coating exhibits a daytime radiative cooling efficiency of 5.7 °C in hot Nanjing. Meanwhile, the COM can be produced into different scattering materials via spray coating, freeze casting, and solution casting technology. This study will facilitate the development of scalable and sustainable optical metamaterials for mitigating energy consumption. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Two new kateretid beetle species (Coleoptera: Kateretidae) with specialized antennal scapes in males from mid-Cretaceous Kachin amber

Author

National Natural Science Foundation of China, Generalitat de Catalunya, Zhao, Qian, Peris, David, Liu, Jia, Huang, Diying, Cai, Chenyang, National Natural Science Foundation of China, Generalitat de Catalunya, Zhao, Qian, Peris, David, Liu, Jia, Huang, Diying, and Cai, Chenyang

Abstract

Kateretidae is a beetle family with 15 reported fossil species, four of them with specialized antennal scape. Specialized scape represents a rare form of sexual dimorphism in Kateretidae. Here we report two new species with a special scape in males of Protokateretes Zhao, Huang and Cai, 2023, and one female individual of an unnamed species of Protokateretes. The discovery of new species provides a supplementary diagnosis of Protokateretes, and increases the biodiversity of the fossil genus. The high diversity of species in Protokateretes provides new insights into sexual dimorphism of Kateretidae in mid-Cretaceous, enriching the knowledge of potential courtship strategy of kateretid beetles in the late Mesozoic.

Published
2024

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