INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2018
·Vol. 39
·期 5
·1-11
·
IF 0.829
Fan Desong,Sun Si,Guo Li
A novel thermal control coating was presented based on the thermochromism of manganite. The pigment of K-doped manganite nanoparticles was dispersed into polymer matrix to prepare the coating with curing below 200 \(^{\circ }\) C. The nanoparticles size mainly distributes around 100–200 nm, and it shows a comparable stoichiometric ratio. The phase transition of the nanoparticles was observed from ferromagnetic metallic to paramagnetic insulator state. With increasing K doping level, the phase transition temperature increases, achieving controllable adjustment. Coating surface with and without pore defect was obtained by different polymer matrix. A sharp emittance variation was observed with increasing temperature in K-doped coating. The variation magnitude of emittance is up to 0.46, which is attractive to space thermal control. It is suggested that the pigment content of 50 wt% is sufficient to realize a large emittance variation.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Shenghua Lin,Ling Ai,Jing Zhang,Tongle Bu,Hongjiang Li,Fuzhi Huang,Jun Zhang,Yuehui Lu,Weijie Song
Silver ants forage at extremely high environmental temperatures, the hairs of which play a crucial role in reducing the body temperature via enhanced optical reflection and radiative heat dissipation as a passive daytime radiative cooler. Inspired by the hierarchical feature structure of the hairs, we fabricated the flexible photonic architectures (FPA) on polydimethylsiloxane (PDMS). With some modification to the feature structure, the FPA-PDMS exhibited not only a large emittance in the mid-infrared spectral range , comparable with that of state-of-the-art thermal emitters , but also the record-high transmittance and haze in the visible and near-infrared range, which would be particularly appealing to photovoltaic devices for maximizing sunlight absorption and minimizing parasitic heat. The ease of application of the FPA-PDMS was demonstrated in both emerging perovskite and mature commercial crystalline silicon solar cells , where the FPA-PDMS was electrostatically attached to their glass superstrates or covers and the improvements in photovoltaic characteristics as a result of enhanced light harvesting were confirmed through laboratory measurements. Though the synergetic effects of the improved transparency and heat radiation brought by the FPA-PDMS need to be characterized outdoors in the future, these findings pave the way for suppressing optical and thermal losses simultaneously in opto-electric-thermal coupled devices through learning sophistically evolved photonic architectures from nature.
研究领域:
材料科学
·
光学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Hongmei Zhong,Ting Meng,Wenxiang Ding,Yi Xiao,Peng Zhang
Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation. Nevertheless, optimizing NaCl particle size, and thus the polymer pore size to enhance scattering capabilities remains a challenge. Here, we report a simple, scalable, and sustainable approach to creating an optimized porous polydimethylsiloxane (PDMS) film. This approach utilizes ultrafine NaCl powders as sacrificial templates, which were synthesized via ultrasonic precipitation to ensure their small size. The ultrafine NaCl particles have a size distribution centered around 6–8 μm, and the as-fabricated porous PDMS film achieves a high thermal emissivity of 0.95 within the atmospheric window (8–13 μm) and exhibits a reflectivity of 0.95 within the visible range (0.4–0.78 μm). Due to the desired dual-spectrum properties, the porous PDMS film exhibits a superior subambient cooling capacity over that fabricated with typically larger NaCl particles under strong sunlight. This study offers a scalable and practical radiative cooling solution for sustainable thermal management.
研究领域:
材料科学
·
能源技术
✓ 已验证
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
APPLIED THERMAL ENGINEERING
·
2020
·
IF 4.725
Qi Sun,Lin Jiang,Huiqi Cao,Jinhua Sun,Ganbin Liu
Statistics have indicated that industrial accidents of ammonium nitrate were primarily caused by uncontrolled external fires where heating was dominantly controlled by radiation, and yet existing studies at milligram scale cannot fully simulate the real fire scenarios. To explore the pyrolysis behavior in typical fires, this study conducted thermal radiation experiments using pure ammonium nitrate, and its mixtures with copper oxide and sulfuric acid. Different from the pyrolysis process identified in milligram scale tests, the bench-scale pyrolysis of ammonium nitrate under radiation consisted of four stages. Pyrolysis structure model of each stage was built to reveal the differences in dominated thermal behavior. Results indicated that two additives had different thermo-chemical effects on pyrolysis of ammonium nitrate. Sulfuric acid accelerated the reaction rate of each stage by generating catalytic nitric acid; copper oxide reduced the number of reaction stages into three via surface absorptions. The time and mass loss rate of different stages were determined. Recommendations on effective emergency response were made to prevent the transition of slow decomposition into fast decomposition, and thus to intervene the fire-induced domino effect of ammonium nitrate. This study helps to understand the pyrolysis behavior of ammonium nitrate under fire exposure, and provides insights for pyrolysis modeling and firefighting in industry of interest.
研究领域:
化学工程
·
安全科学
✓ 已验证
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Xian Dang,Zhulin Huang,Jieyan Yuan,Ke Li,Mengen Hu,Zhuoming Xie,Haoran Song,Bensong Chen,Xinyang Li,Ming Li,Xiaoye Hu,Yue Li
High-purity, nano-sized (Ti 0.2 Zr 0.2 Nb 0.2 Mo 0.2 Hf 0.2 )B 2 (TZNMH) diboride powders were successfully synthesized via a combined flocculation precipitation and boro/carbothermal reduction method. Then, the solid solution formation, thermal radiation performance and mechanical properties of TZNMH were investigated. It is found that high entropy effect endows TZNMH ceramic with outstanding near-blackbody radiation performance in the UV-Vis-NIR region, with a thermal emissivity ≥ 95%. This is because high entropy induces robust intraband transition. A dense and single-phase TZNMH ceramic was obtained by spark plasma sintering with high hardness (HV 0.1 =31.6 GPa) which remained above 30 GPa even after 60 h exposure at 1800 °C in Ar environment. This high hardness of TZNMH ceramic is believed to arise from the strong hybridization between metals and boron, as revealed by density functional theory calculations. This study demonstrates that high-entropy boride ceramics can be used as ideal high-temperature structural component with high thermal emissivity.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaoyu Liu,Yunhui Tang,Yuxiang Liu,Zhilin Cao,Ruzhi Wang,Bing Wang,Bo Wang
In marine environments, managing heat dissipation and corrosion resistance is critical for the longevity of 304 stainless steel, particularly in electronic devices exposed to high temperatures or operational speeds. This study addresses the challenge of enhancing the durability of 304 stainless steel under such conditions by developing a novel composite coating-Superhydrophobic/ZIF-8@CNT/high-entropy alloy (SZCP). The coating was applied to the steel using physical vapor deposition followed by ultrasonic spraying, consisting of a TiVCrAlCu high-entropy alloy film and a superhydrophobic ZIF-8@CNT layer. This innovative approach enhances the steel's thermal emissivity and radiative heat dissipation, as evidenced by the SZCP-coated materials maintaining temperatures up to 12 °C cooler than uncoated steel within 85 s. Electrochemical tests confirmed the high-entropy alloy film as an effective corrosion barrier, while the ZIF-8@CNT layer improved electrochemical stability, reducing the corrosion current density by 98.87 % and lowering the corrosion rate to 0.47 mm/year. Furthermore, treatment with Trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane (FAS17) imparted self-cleaning properties to the coating, achieving contact angles over 150° and sliding angles below 3°, effectively reducing contamination from substances like sand and yogurt. This research introduces a strategic approach to improve the heat dissipation, self-cleaning, and corrosion resistance of metal substrates in challenging environments, offering significant potential for industrial applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiabin Jiang,Xiaoli Guan,Xin Gu,Jiamei Han,Kaikai Wu,Limin Zhao,Yixin Yan,Xiaokun Zhu,Xiang Liu
With the development of the radiation thermometers, perovskite manganites have been fallen into the focus of highly sensitive infrared bolometers due to its metal-insulator transition properties. In this study, La 0.7 Ca 0.3 MnO 3 (LCMO) films were prepared on ( l 00) LaAlO 3 substrates using sol-gel spin-coating technology by adjusting different sintering temperatures ( T s , 1000 °C ≤ T s ≤ 1400 °C). The analysis of the microstructure, surface morphology , ion valence state, and electrical transport properties revealed that the crystalline quality enhanced and the concentration of Mn 4+ increased with the increasing of sintering temperature, promoting the DE effect and improving the electrical properties of the LCMO films. At T s = 1200 °C, the temperature coefficient of resistivity ( TCR ) value of the LCMO film reached the maximum value (22.95% K −1 ) and corresponding peak TCR temperature of 246.85 K indicating that the LCMO film has great potential in infrared bolometers.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Mu,Liwen Yan,Peisen Liu,Qichao Gao,Anran Guo,Xiaojing Xu,Haiyan Du,Shun Dong,Jiachen Liu
As a critical structure of thermal protection systems, flexible fibre insulation felts are widely used on the leeward surface of spacecrafts. To enhance the thermal resistance of flexible fibre felts, SiC w -ZrO 2 coatings with different SiC whisker (SiC w ) contents were fabricated on the surface of a high-silica-fibre fabric (HSFF) by employing a sol-gel method combined with a spraying route. The introduction of SiC w having a length of 10–50 μm effectively improved the coating integrity. After calcination at 1000 °C for 1 h, the SiC w -ZrO 2 coating containing 8 wt% SiC w did not damage the tensile strength and flexibility of the fibre fabric, and the interfacial bonding strength between the coating and HSFF reached 0.40 MPa, benefitting from the whisker toughening mechanism. The SiC w -ZrO 2 coating with a high emissivity of 0.96 in the 2–14 μm wavelength range reduced the surface temperature of the flexible insulation felt by approximately 300 °C when a butane torch was applied at above 1300 °C.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dehua Ma,Yongshuai Xie,Lin Wang,Ying Peng,Yunguang Yin,Xinqiang Wang,Benxue Liu,Guanghui Zhang,Luyi Zhu,Dong Xu
La 2 Zr 2 O 7 fibrous membrane (LZFM), with high uniform distribution and single phase, was fabricated by sol–gel method combined electrospinning technique and the precursor of lanthanum zirconium bimetallic complex, polyacetylacetone lanthanum-zirconium (PALZ) with the ceramic yield of 57.8% was synthesized for the first time. The LZFM had high heat radiation reflectivity (750–2500 nm: Avg 93.2%@1200 °C), low thermal conductivity (25.4 mW·m −1 ·K −1 @-40 °C, 57.5 mW·m −1 ·K −1 @1000 °C), low density (28–50 mg/cm 3 ) and excellent flexibility until 1300 °C. The grain arrangement on the fiber surface was tight with no obvious defects and pores, and the average grain size was only 47.1 nm at 1000 °C for 8 h. The LZFM exhibited excellent high-temperature insulation performance using silicon carbide rod and butane flame as the heat source up to 1530 °C and 1400 °C, respectively. Furthermore, the layered assemblage of LZFM and Al foil was designed, serving as a thermal insulation layer, low-infrared-emission, and high-infrared-reflection layer. The combined structure effectively hid high-temperature targets and achieved infrared stealth (>1300 °C). From the above results, one could find that the LZFM possessed a super high-temperature insulation effect with high thermal stealth performance, implying that LZFM will have a good prospect in thermal insulation protection and infrared stealth.
研究领域:
材料科学
·
热能工程
✓ 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）