JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Muyang Zhang,Yuming Zhou,Man He,Tao Zhang,Tingyuan Huang,Binbin Ding,Fangling Ruan,Fangfang Huang
A new-type of composite combined by helical polysilane (HPS) and hollow spherical indium oxide (In 2 O 3 ) was designed and fabricated via solution blending. The hollow spheres constructed by In 2 O 3 particles were synthesized via a facile hydrothermal route where it demonstrated larger surface area, enabling the combination of HPS and In 2 O 3 more easily. Meanwhile, the synergetic effect between functional group of HPS and surface hydroxyl of In 2 O 3 improve the reduction of infrared emission. Consequently, the composite shows a superior low infrared emissivity performance at the value of 0.416 (8–14 μm), and the covering of HPS make the composite disperse well in the polar reagent. This work develops a feasible strategy that utilizes metallic oxide to design and synthesize hollow spherical matrix for preparing the low infrared emissivity materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2025
·Vol. 6
·期 12
·
IF 7.3
Nan Zhang,Xiaohan Li,Zhaoli Zhang,Zhixing Luo,Liu Yang,Xiaoling Cao,Yanping Yuan
Photothermal conversion phase-change materials (PCPCMs) effectively harvest and store solar thermal energy but suffer from high radiative losses due to their intrinsic infrared emissivity. Here, we report a bidirectional thermal regulation approach integrating spectrally selective low-infrared-emissivity surfaces with directional thermal transport channels to address this issue. This design achieves a mid-infrared emissivity of 0.34 on the surface and a 65% enhancement in internal heat transfer while maintaining enthalpy with negligible reduction. A photothermal physical model with a cutoff wavelength accurately quantifies the convective and radiative losses induced by the hot mirror. The results reveal that the heat dissipation pathway shifts from radiation dominated to convection dominated, leading to a 76% reduction in radiative loss and a 27% improvement in photothermal conversion efficiency. This work decouples optical absorption from thermal emission, providing an efficient and generalizable route for high-performance solar thermal energy harvesting and storage systems.
研究领域:
太阳能
·
材料科学
·
热工工程
·
光热转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 8
·1789
·
IF 3.1
Hongye Wang,Yanyu Pan,Jincheng Zhang,Kaixian Wang,Liyan Xue,Minzhong Huang,Yazhu Li,Fan Yang,Heng Chen
The development of a new generation of solid particle solar receivers (SPSRs) with high solar absorptivity (0.28–2.5 μm) and high infrared emissivity (1–22 μm) is crucial and has attracted much attention for the attainment of the goals of “peak carbon” and “carbon neutrality”. To achieve the modulation of infrared emission and solar absorptivity, two types of medium- and high-entropy rare-earth hexaboride (ME/HEREB6) ceramics, (La0.25Sm0.25Ce0.25Eu0.25)B6(MEREB6) and (La0.2Sm0.2Ce0.2Eu0.2Ba0.2)B6(HEREB6), with severe lattice distortions were synthesized using a high-temperature solid-phase method. Compared to single-phase lanthanum hexaboride (LaB6), HEREB6ceramics show an increase in solar absorptivity from 54.06% to 87.75% in the range of 0.28–2.5 μm and an increase in infrared emissivity from 76.19% to 89.96% in the 1–22 μm wavelength range. On the one hand, decreasing the free electron concentration and the plasma frequency reduces the reflection and ultimately increases the solar absorptivity. On the other hand, the lattice distortion induces changes in the B–B bond length, leading to significant changes in the Raman scattering spectrum, which affects the damping constant and ultimately increases the infrared emissivity. In conclusion, the multicomponent design can effectively improve the solar energy absorption and heat transfer capacity of ME/HEREB6, thus providing a new avenue for the development of solid particles.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2014
·
IF 2.21
Zhenjie Chen,Yuming Zhou,Xiaohai Bu,Tao Zhang,Man He
Optically active polyacetylenes (LPA and DPA) and racemic polyacetylenes (RPA) were prepared by the polymerization of N-propioloyl-tyrosine methyl esters that derived from chiral and racemic tyrosine. All the polymers were characterized by Fourier transform infrared spectroscopy, 1H NMR, 13C NMR, gel permeation chromatography, thermogravimetric analysis, UV–vis spectroscopy, and circular dichroism spectroscopy; furthermore, the infrared emissivity values were also investigated. Both LPA and DPA possessed the helical conformations and a higher degree of intra- and interchain hydrogen bonds compared with RPA, which presented irregular polymer chain. The thermal stability of LPA and DPA was higher than that of RPA due to the helical conformations, which could be easy to form a high degree of intra- and interchain hydrogen bonds in the structure. Therefore, LPA and DPA exhibited lower infrared emissivity values (8–14 μm) than that of RPA, which resulted from the helical conformations and a higher degree of intra- and interchain hydrogen bonds.
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Tengchao Guo,Guoyue Xu,Shujuan Tan,Ning Liu,Jianchao Zhang,Xiangxiong Zeng,Juan Liang
The electronic properties and infrared emissivity of Zn 1-x Mg x O (x = 0, 0.0625, 0.125) were systematically investigated by using the first-principle calculation s based on density functional theory (DFT). The Zn 1-x Mg x O (x = 0, 0.0625, 0.125) powders were prepared by sol-gel method and their infrared emissivity in the wavelength of 8–14 μm was characterized. The results indicate that the infrared emissivity increases with the increase in Mg concentration, which is attributed to the reduction in conductivity and in the real part of dielectric function. Furthermore, the variation in conductivity and dielectric function has been well studied, and a reasonable method to calculate infrared emissivity of semiconductors has been established. It is expected that this method can be used for designing materials with different infrared emissivity and also applied for effectively guiding the experimental investigation.
研究领域:
材料科学
·
凝聚态物理
·
计算材料学
·
功能材料
·
半导体物理
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2014
·Vol. 24
·期 3
·591-599
·
IF 1.077
Chen Zhenjie,Zhou Yuming,Zhang Tao,Bu Xiaohai,Sheng Xiaoli
Optically active
polyacetylene@CdTe Quantum Dots (HPA@CdTe and RPA@CdTe) composites have been prepared based on the surface modification of CdTe quantum dots (QDs). The as-prepared HPA@CdTe and RPA@CdTe were characterized by Fourier-transform infrared spectroscopy, UV–Vis absorption spectra, X-ray diffraction, thermogravimetric analysis, transmission electron microscopy and scanning electron microscopy. The infrared emissivity of HPA@CdTe and RPA@CdTe was also investigated. The results indicate that the polyacetylenes were successfully grafted onto the surfaces of the CdTe QDs without destroying the original crystalline structure of the CdTe QDs. Moreover, the infrared emissivity values of the HPA@CdTe and RPA@CdTe composites were reduced to 0.392 and 0.454, which possess much lower infrared emissivity values than those of the pure polymers and nanoparticles. The results are attributed to interfacial interactions between the organic and inorganic components. Furthermore, the helical conformation may also reduce the infrared emissivity due to the more ordered stereo structure and regular secondary structure.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
聚合物纳米复合材料
·
红外物理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Jia-Qi Zheng,Jian Chen,Ming Zhu,Wen-Hui Chen,Ning-Ning Ma,Xiu-Min Yao,Zheng-Ren Huang
N-doped SiC-MoSi 2 ceramics were successfully fabricated by hot pressing in N 2 using Y(NO 3 ) 3 .6 H 2 O as both sintering aids and additional N sources. The impact of Y(NO 3 ) 3 .6 H 2 O content on the densification, electrical properties, and infrared emission performance of the resulting ceramics were investigated. The distribution of Y-based sintering aid is improved by melting of Y(NO 3 ) 3 .6 H 2 O during slurry drying, enabling the relative density to increase up to 97.4%. Y(NO 3 ) 3 .6 H 2 O subsequently decomposes during sintering and allows the substitution of atomic N for the C sites in SiC lattice and production of the N-derived donor level. A larger amount of N dopant elevates the carrier density up to 1.90 × 10 16 cm -3 . Remarkably, The SiC − 10 wt% MoSi 2 ceramics sintered with 16.9 wt% Y(NO 3 ) 3 .6 H 2 O exhibits the lowest electrical resistivity (0.791 Ω·cm at room temperature) and highest infrared emissivity (0.913 at 800 ℃), the latter of which may also be attributed to lattice distortion induced by N doping . This work demonstrates N doping as a prospective strategy for synergistically optimizing the electrical conduction and infrared emission performance of SiC-based ceramics for infrared source applications.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Xiangfei Kong,Yinqi Chen,Bo Yang,Wei Liu,Rongxin Yin,Jihui Yuan,Jiale Chai
Phase change material (PCM) applied on building envelope (e.g., roof, wall) has been proved to be effective for reducing both cooling and heating energy use. Recently, preliminary studies have applied high-emissivity radiative cooling material on PCM for enhancing cooling performance. However, since emissivity of the cooling material is static, it leads to a fast indoor heat dissipation rate at cold ambient and thus results in increased building heating loads. To this end, this study develops a dynamic-emissivity PCM that synchronizes adaptive emissivity regulation with PCM’s latent heat characteristics, thereby reducing both building cooling and heating loads. This composite material integrates a temperature-responsive Fabry-Perot resonator with PCM using facile and cost-effective method (mainly spin coating). The composite PCM can achieve low emissivity for heating in cold environment and high emissivity for cooling in hot environment in response to ambient temperature change, which matches the latent heat absorption and release of PCM for improving thermal performance. Outdoor experiments show that the composite PCM can reduce and increase the indoor temperature by more than 3.5 ℃ at hot ambient and 1.5 ℃ at cold ambient respectively in comparison with conventional PCM. Numerical simulations demonstrate the developed material can achieve 10.5–23.5 % year-round energy savings across diverse Chinese climate regions. At last, the color design of the composite material is also conducted to cater for users’ preferences. This work paves new way to develop advanced PCM for all-season building energy savings.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Haining Ji,Dongqing Liu,Haifeng Cheng,Chaoyang Zhang,Lixiang Yang
Vanadium dioxide, which has been demonstrated as negative differential thermal emissivity materials for emissivity engineering application , is regarded as the most important and promising material for adaptive infrared camouflage. This study describes the synthesis and characterization of high purity, uniform VO 2 nanopowders by a single-step hydrothermal method and their thermal polymorphism. A dramatic phase transition of the monoclinic VO 2 nanopowders to a tetragonal phase upon heating and the accompanying change in the IR emissivity are demonstrated. Importantly, we demonstrate the tunability of the infrared radiation intensity of VO 2 nanopowders in both mid- and far-IR thermal atmospheric windows, for the first time. The structural transition is analyzed by variable temperature XRD and temperature-dependent Raman spectroscopy . Furthermore, an unexpected structural change in the same region of the sample was observed in a transmission electron microscope , which provides a direct mechanistic understanding of the infrared emissivity variation. Our study makes a significant contribution to the state-of-the-art in thermal camouflaging, because this study demonstrates that the VO 2 nanopowders can be extremely promising camouflage materials in the area of adaptive infrared camouflage technology both in the far-infrared and mid-infrared regions and the material is suitable for substrates with large surface areas and/or complex morphologies.
研究领域:
材料科学
·
纳米技术
·
红外技术
·
热伪装
·
智能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Jia-Qi Zheng,Jian Chen,Bu-Hao Zhang,Xue-Jian Liu,Zhong-Ming Chen,Hai-Bo Wu,Zheng-Ren Huang
SiC-MoSi 2 composites with low electrical resistivity and high infrared emissivity were fabricated via pressureless sintering. The relationship between microstructure evolution and electrical behaviors along with infrared emission properties of the resulting composites is investigated at various sintering temperatures . The electrical resistivity undergoes two significant drops with increasing sintering temperature. Pore elimination bears responsible for the initial decrease in electrical resistivity. Transmission electron microscopy (TEM) observation manifests that the thinned amorphous layers at SiC/MoSi 2 interface decrease grain boundary resistivity and allow for electrical percolation to occur when sintering temperature further rises. Additionally, increasing sintering temperature leads to a higher infrared emissivity owing to the formation of Mo 4.8 Si 3 C 0.6 and the decreased boundaries. The lowest electrical resistivity of 7.2 Ω cm and the highest infrared emissivity of 0.721 are recorded for composite sintered at 2000 ℃. Overall, SiC-MoSi 2 composites exhibit a promising prospect as infrared source elements that must endure harsh environments.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Xiaohai Bu,Yuming Zhou,Man He,Zhenjie Chen,Tao Zhang
Optically active silica/titania/substituted polyacetylene (SiO 2 /TiO 2 /SPA) multilayered core–shell nanocomposite was successfully prepared by the combination of subsequent surface titania deposition and polymer grafting on the bare silica nanosphere. The chiral amino acid-based SPA copolymer serving as the organic shell was optically active and adopted a predominately single-handed helical conformation. The SiO 2 /TiO 2 /SPA nanospheres were characterized by Fourier transform infrared spectroscopies (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to record the formation of the multilayered architecture and the results clearly showed that the inorganic/organic hybrid nanoparticles exhibited hierarchical multilayered core–shell construction. The SPA outer shell experienced an enhancement in thermal stability and still remained considerable optical activity after grafting to the SiO 2 /TiO 2 nanosphere. The SiO 2 /TiO 2 /SPA nanocomposite had an infrared emissivity value ( ɛ = 0.548) at the wavelength of 8–14 μm which was much lower than each of its components. The reduced infrared emissivity values proved that the strengthened interfacial interactions originating from the coating SPA had an effective synergistic effect with the semiconductive anatase TiO 2 nanoparticles on silica sphere in lowering the infrared emissivity value.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Xiaohai Bu,Yuming Zhou,Zhenjie Chen,Man He,Tao Zhang
Chiral amino acid-based monosubstituted acetylene monomers [ N - tert -butoxy-carbonyl- l -phenylalanine- N ′-propargylamide (LP), and N - tert -butoxycarbonyl- l -serine- N ′-propargylamide (LS)] were (co)polymerized with rhodium zwitterion catalyst in THF to afford helical polyacetylenes (PAs) with moderate molecular weights (4400–14,800) in good yields. The optically active PA copolymers were soluble in common organic solvents and proven to adopt predominately single-handed helical conformations according to their intense Cotton effect and large specific rotations. Various contents of amino acid units in side chains facilitated controllable helical secondary structure while the helix was primarily stabilized by hydrogen bonding and steric repulsion between the substituents. Intramolecular hydrogen bonds constructed between hydroxyl and amide groups, in particular, played a significant role in adjusting the helicity and orderliness of the helix. The infrared emissivity values of the PAs at wavelength of 8–14 μm were measured and the correlation between helical conformations and their effect on infrared emission were systematically investigated. The results showed that more well-ordered and compact screw-sense could enhance the performance of organic polymers in lowering their infrared emissivity. Among all the as-prepared PAs, poly(LP 50 - co -LS 50 ) exhibited the lowest infrared emissivity value ( ε 25 = 0.632) and possessed excellent resistance against heat.
研究领域:
高分子化学
·
材料科学
·
光学
✓ 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）