Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Lu Huangjie,Xie Jian,Wang Xin-Yu,Wang Yaxing,Li Zi-Jian,Diefenbach Kariem,Pan Qing-Jiang,Qian Yuan,Wang Jian-Qiang,Wang Shuao,Lin Jian
Radiation dosimeters displaying conspicuous response of irradiance are highly desirable, owing to the growing demand of monitoring high-energy radiation and environmental exposure. Herein, we present a case of dosimetry based on a discrete nanocluster, [Th 6 (OH) 4 (O) 4 (H 2 O) 6 ](TPC) 8 (HCOO) 4 ∙4DMF∙H 2 O (Th-SINAP-100), by judiciously incorporating heavy Th 6 polynuclear centers as radiation attenuator and organic linkers as photo-responsive sensor. Interestingly, dual-module photochromic transitions upon multiple external stimuli including UV, β-ray, and γ-ray are integrated into this single material. The striking color change, and more significantly, the visible color transition of luminescence in response to accumulating radiation dose allow an on-site quantitative platform for naked-eye detection of ionization radiations over a broad range (1–80 kGy). Single crystal X-ray diffraction and density functional theory calculations reveal that the dual-module photochromism can be attributed to the π(TPC) → π*(TPC) intermolecular charge transfer driven by enhanced π-π stacking interaction between the adjacent TPC moieties upon irradiation.
研究领域:
材料科学
·
放射医学
✓ 已验证
DOI
高影响因子
ENERGY AND BUILDINGS
·
2024
·
IF 6.6
Yan Zhang,Wenjing Qin,Yanli Wang,XinXin Li,Changshun Gu,Mengyao Chen,Xiujie Guo,Hengchao Liu,Boxin Zhao
With the frequent occurrence of extreme climates, passive daytime radiant cooling (PDRC) and passive daytime radiant heating (PDRH) technologies are receiving more and more attention as green and sustainable ways to regulate temperature. Here we present a Janus composite porous fiber membrane (MXene@PVDF/TPU), prepared by controlling the ratio of two components, PVDF and TPU, in the electrospinning precursor solution, to regulate the optical, mechanical, and other properties of the fiber membrane. By spraying MXene on one side of the fiber membrane, we achieve radiative heating performance, while the side without MXene spraying exhibits radiative cooling performance. Switching between cooling and heating modes can be accomplished by simply flipping the composite fiber membrane. The cooling side of the fiber membrane has high solar reflectance (93.75 %) and mid-infrared emissivity (83.09 %), and can cool the ambient temperature up to 8.2 °C at noon. At the same time, the heating side of the fiber membrane has low reflectance (14.18 %) and mid-infrared emissivity (24.22 %), and can heat the environment up to 7.4 °C at noon. Besides, due to the electrical and thermal properties of MXene, the MXene@PVDF/TPU fiber membrane exhibits excellent Joule heating characteristics, which can effectively compensate for the PDRH. Switching between the modes of cooling and heating can be achieved by a simple flip of the composite fiber membrane, which is important to reduce carbon emissions to alleviate the energy crisis.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 8
·1208
·
IF 2.972
Yiwei Liu,Anqi Bai,Zhenggang Fang,Yaru Ni,Chunhua Lu,Zhongzi Xu
Radiative cooling can make the selective emitter cool below ambient temperature without any external energy. Recent advances in photonic crystal and metamaterial technology made a high-efficiency selective emitter achievable by precisely controlling the emitter’s Infrared emission spectrum. However, the high cost of the photonic crystals and meta-materials limit their application. Herein, an efficient bilayer selective emitter is prepared based on the molecular vibrations of functional nanoparticles. By optimizing the volume fraction of the functional nanoparticles, the bilayer selective emitter can theoretically cool 36.7 °C and 25.5 °C below the ambient temperature in the nighttime and daytime, respectively. Such an efficient cooling performance is comparable with the published photonic crystal and metamaterial selective emitters. The rooftop measurements show that the bilayer selective emitter is effective in the ambient air even under direct sunlight. The relatively low cost and excellent cooling performance enable the bilayer selective emitter to have great potential for a practical purpose.Keywords:radiative cooling;bilayer selective emitters;thermal radiation;functional thin films
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 5
·1403
·
IF 3.5
Min Luo,Peng Bo,Yang Shao,Zhiming Liu,Diandou Xu,Lingling Ma
Murals are one of the important cultural heritages of mankind. The microbial control of murals is an important subject in mural painting conservation. In recent years, electron beam radiation sterilization has attracted more and more attention in the field of cultural relic protection. Murals are immovable cultural relics, so conventional electron beam irradiation equipment can not be used. However, the development of small mobile electron beam irradiation equipment shows the potential of radiation’s application in the sterilization protection of immovable cultural relics such as murals. A feasibility study of radiation sterilization in mural paintings is needed to investigate the effect of sterilization and the influence of sterilization dose on the stability of mural painting pigments and bonding materials. In this paper, the radiation effects of typical bacteria in tomb murals and mineral pigment powder in ancient Chinese paintings were studied in a laboratory. Firstly,aeromonas hydrophila(Aer.h) andpenicillium flavigenum(PNC) were selected as representative strains to determine the appropriate sterilization dose for murals. Then, the effects of radiation on seven kinds of ancient Chinese mineral pigments and white calcium carbonate in the ground layer were verified. The results are as follows: the radiation dose of 10 kGy can effectively remove the two typical strains. This sterilization dose will cause a color difference in calcium carbonate and lead white, while other color pigments are essentially stable. Based on the color difference and UV-vis intensities of the four white carbonate samples, the color change in two of them increased with increasing the dose up to 30 kGy, after which signs of saturation began to appear. X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectra showed that the chemical structure of the samples did not change after irradiation. The formation of free radicals in treated samples was confirmed using an electron paramagnetic resonance (EPR) spectrum test. According to all characterization results, the color difference between the four white carbonate samples may be due to the combination of unpaired electrons and defects in the process of electron beam irradiation to form color centers. After forming the color center, the light absorption of the four samples changed. This is a reversible change, but the samples will take a long time to return to their original state. This study focuses on the influence of electron beam radiation on pigment composition, which is a preliminary exploration of whether radiation sterilization can be applied to the protection of ancient Chinese mural paintings, and the experimental results can provide basic data for later application.Keywords:electron beam radiation;mural protection;radiation sterilization;mineral pigment;chromatic aberration
研究领域:
文化遗产保护
·
辐射生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yuxin Zhang,Dingsheng Wu,Shiqin Liao,Dongsheng Chen,Alfred Mensah,Xue Guo,Pengfei Lv,Qufu Wei
Passive radiative thermal management has been recognized as one of the most promising energy-saving technologies to provide thermal comfortable environment. However, static function and complex production process limit its application. Herein, we propose a simple strategy to achieve the integration of radiative cooling, radiative heating, and active electro-thermal heating. It is worth stressing that the radiative cooling is only based on the self-reflective structure and self-emissive molecular property of cellulose acetate electrospun membrane. In cooling mode, the average temperature of Janus film outdoor is 9.4 °C lower than commercial cotton fabric. Meanwhile, radiative heating and active heating stem from the photothermal and electrothermal performance of MXene . In heating mode, the average temperature of Janus film is 40 °C higher than cotton fabric. Flipping the Janus film allows for dynamic thermal management. In short, the scalable and universal strategy paves the way for the development of dynamic thermal-regulating technology.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Bin Tian,Xinzhu Gan,Zhigang Wang,Yong Xu,Lin Wang,Conghe Xu,Ling Li
In this study, TiO 2 nanosheets were directly grown on ZrO 2 fibers by employing a solvothermal technique without requiring a TiO 2 seed layer, targeting thermal radiation shielding applications. The crystalline form and microstructure of the TiO 2 nanosheets were characterized using SEM, Raman, XRD, XPS, and TEM. The infrared thermal radiation extinction properties of the TiO 2 nanosheets were evaluated using DRS and effective specific extinction coefficient ( e *), and their thermal endurance at high temperatures was also assessed. The results showed that, within the infrared band of 2.5 to 8.5 μm, the TiO 2 nanosheet arrays with a thickness of 423 nm enhanced the e* of ZrO 2 fibers by 58.59 %. At similar coating thicknesses, nanosheet coatings exhibited superior thermal radiation shielding performance compared to nanoparticle coatings. These findings suggest that ZrO 2 fibers loaded with TiO 2 nanosheets are promising candidates for thermal radiation shielding in aerogels or extreme environmental conditions.
研究领域:
材料科学
·
热防护技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Runcai Xiao,Chengyi Hou,Weifeng Yang,Yun Su,Yaogang Li,Qinghong Zhang,Peng Gao,Hongzhi Wang
Extreme heat events are mainly responsible for weather-related human mortality due to climate change. However, there is a lack of outdoor thermal management for protecting people from extreme heat events. We present a novel infrared-radiation-enhanced nanofiber membrane (NFM) that has good infrared resonance absorption and selectively radiates thermal radiation of the human body through the atmosphere and into the cold outer space. The NFM comprises polyamide 6 (PA6) nanofibers and randomly distributed SiO2 submicron spheres and has sufficient air permeability and thermal–moisture comfortability because of its interconnect nanopores and micropores. We measure the sky radiative cooling performance under a clear sky, and PA6/SiO2 NFM produces temperatures that are about 0.4–1.7 °C lower than those of commercial textiles when covering dry and wet hands and temperatures 1.0–2.5 °C lower than the ambient temperature when thermal conduction and convection are isolated in a closed device. Our processed PA6/SiO2 NFM combines sky radiative cooling with thermal management of the human body very well, which will promote the development of radiative cooling textiles.
研究领域:
材料科学
·
环境科学
·
纺织工程
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Qingyuan Zhao,Shuqi Wang,Guoliang Chen,Yifan Sun,Yongchun Zou,Enyu Xie,Zijian Peng,Junteng Yao,Ouyang Jiahu,Yaming Wang,Dechang Jia,Yu Zhou
As the thrust-weight ratios of aero-engines increase, the severe thermal radiation emitted by high-temperature gases (≥1800 K) poses a significant challenge for thermal barrier coating (TBC) materials. Traditional TBC materials, despite their reliable thermal insulation properties, are nearly transparent to infrared radiation, which leads to direct radiative heating of the metallic substrate, consequently reducing its service life. In response, a La 2 Hf 2 O 7 -based ceramic doped with a NiFe 2 O 4 second phase is developed to prevent the penetration of thermal radiation and achieve exceptional thermal radiation shielding properties. The experimental results exhibit that 85%La 2 Hf 2 O 7 /15%NiFe 2 O 4 possesses high absorptivity exceeding 0.85 across a broad wavelength range (0.2-14 µm), and ultra-low transmittance of 0.001 in the range of 0.4-2.5 µm. It attributes to the presence of multi-valent transition elements (Ni + /Ni 2+ and Fe 2+ /Fe 3+ ) in NiFe 2 O 4 , which significantly reduce the band gap width, enhancing photon absorption, scattering, and electron transition probability following infrared radiation absorption. These multifaceted contributions minimize radiative thermal conductivity to 1.55 W m −1 K −1 , effectively shielding the radiative heat transfer. These advantages make this high-temperature thermal shielding strategy highly competitive for the next generation of TBC materials development and application.
研究领域:
材料科学
·
航空航天工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xianhu Liu,Yingnuo Li,Yamin Pan,Zhenyu Zhou,Zhanyu Zhai,Chuntai Liu,Changyu Shen
Due to global warming and the energy crisis, incorporating passive radiative cooling into personal thermal management has attracted extensive attention. However, developing a wearable textile that reflects incoming sunlight and allows mid-infrared radiation transmission is still a tough challenge. Herein, a shish-kebab superstructure film was produced via a flow-induced crystallization strategy for personal radiative cooling. The resulting film endowed a high infrared transmittance (87%) and improved sunlight reflectivity (83%). A device was developed to simulate the human body skin, and the temperatures of the shish-kebab film were 2.5 and 2.6 °C lower than that of traditional textile in outdoor and indoor tests, respectively. In order to make the shish-kebab film more wearable, a series of modifications were then carried out. This study demonstrates the substantial potential to personal thermal management textiles.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Wei Wei,Yong Zhu,Qiu Li,Zefeng Cheng,Yongji Yao,Qi Zhao,Pan Zhang,Xiaopeng Liu,Zhang Chen,Feng Xu,Yanfeng Gao
The development of a textile that cools skin both in sunshine and in room can not only protect the human body from a severely hot working environment but also save energy by lowering air conditioner load. Herein, we have developed a concept that combines solar energy reflection and “passive radiative cooling” for strengthening both solar energy blocking and heat dissipation through long-wave infrared (LWIR) radiation at wavelengths of 8–13 μm. The current technique is achieved by coating a textile with an Al 2 O 3 dispersed-cellulose acetate. Cellulose acetate possesses high emissivity in the LWIR region , which can promote effective LWIR radiation (2.5–25 μm). Al 2 O 3 has a high thermal conductivity (30–40 W m −1 K −1 ) and can enhance solar energy reflectivity . By coating Al 2 O 3 -cellulose acetate, solar energy reflectivity of the textile significantly increases from 62.6% to 80.1% (0.3–2.6 μm). A cooling performance experiment reveals that this modified textile can reduce the temperature of simulated skin by 2.3–8 °C compared to that of an unmodified reference. Furthermore, in a real-life cooling performance experiment, a modified T-shirt can avoid the overheating of actual human skin by 0.6–1.0 °C, corresponding to a temperature decrease by 1.9–3.3 °C for the internal surface of the textile. This work provides a method for the design and synthesis of radiative cooling textiles for personal thermal management.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 19
·2206149
·
IF 13.3
Keqiao Li,Meng Li,Chongjia Lin,Gongze Liu,Yang Li,Baoling Huang
Textiles with radiative cooling/warming capabilities provide a green and effective solution to personal thermal comfort in different climate scenarios. However, developing multiple-mode textiles for wearing in changing climates with large temperature variation remains a challenge. Here a Janus textile is reported, comprising a polyethersulfone (PES)-Al 2 O 3 cooling layer optically coupled with a Ti 3 C 2 T x warming layer, which can realize sub-ambient radiative cooling, solar warming, and active Joule heating. Owing to the intrinsically high refractive index of PES and the rational design of the fiber topology, the nanocomposite PES textile features a record high solar reflectance of 0.97. Accompanied by an infrared (IR) emittance of 0.91 in the atmospheric window, sub-ambient cooling of 0.5–2.5 °C is achieved near noontime in humid summer under ≈1000 W m −2 solar irradiation in Hong Kong. The simulated skin covered with the textile is ≈10 °C cooler than that with white cotton. The Ti 3 C 2 T x layer provides a high solar-thermal efficiency of ≈80% and a Joule heating flux of 66 W m −2 at 2 V and 15 °C due to its excellent spectral selectivity and electrical conductivity. The switchable multiple working modes enable effective and adaptive personal thermal management in changing environments.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
YueChao Zhao,Fei Fang
Flexible biomimetic photonic structures, capable of achieving dynamic radiation modulation in both solar and infrared (IR) bands as required, are increasingly catering to low-energy thermal management and sustainable development. Herein, the cephalopod-inspired composite film of styrene-ethylene-butene-styrene block copolymer (SEBS)/titanium dioxide (TiO 2 )-Mxene has been designed and prepared. Analogous to squid leucophores, the SEBS/TiO 2 layer of is able to regulate solar reflection and transmit infrared radiation. Mimicking squid iridocytes, the Mxene layer can regulate infrared reflection and absorb sunlight. The optimal structural parameters of the film and the regulation contrast were estimated via theoretical analysis. The theoretical design also illustrates that the two layers collaborate without interference. According to the optimal parameters, the Mxene-SEBS/TiO 2 film was prepared. A dynamic regulation between radiative heating and cooling, namely, the solar reflection between 38 % and 66 % and infrared emissivity between 68 % and 89 % can be realized via mechanical actuation under 200 % strain. As the solar radiation is ∼650 W/m 2 , the composite film achieves ∼6.2 °C heating/∼1.4 °C cooling of the skin under mechanical actuation. When reducing the natural convection loss, the film further achieves ∼11.6 °C heating/∼0.8 °C cooling of the skin. This work provides a novel system and strategy for radiation modulation in solar-infrared bands for possible applications in thermal management.
研究领域:
材料科学
·
能源科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）