RSC Advances
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2015
·Vol. 5
·期 107
·88548-88555
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IF 3.84
Muyang Zhang,Yuming Zhou,Man He,Tao Zhang,Xiaohai Bu
The novel single-handed helical polysilanes (HPS), poly[di-n-hexylsilane-co-(methoxycarbonyl ethyl propyl ether)methylsilane] were synthesized by the Wurtz-type coupling of the chiral functional monomer, dichloro(methoxycarbonyl ethyl propyl ether)methylsilane (DCMMS). The monomer was prepared by the hydrosilylation reaction of methyl (S)-2-(allyloxy)propanoate. The chemical structure of HPS was confirmed by 1H, 13C and 29Si nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis) and circular dichroism (CD). The weight distributions and crystallinity of the polysilanes were demonstrated by gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and polarized light microscopy (POM), respectively. The single-handed helical characterization and polymerization degree of the new-typed polysilanes could be controlled by the co-monomers of DCMMS and di-n-hexyldichlorosilane (DCDHS), respectively. Furthermore, the infrared emissivity values (0.598 at 8–14 μm) of HPS were investigated by an Infrared Emissometer.
研究领域:
材料化学
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高分子科学
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 19
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IF 1.86
Xiaohai Bu,Zewu Zhang,Zusheng Hang,Ying Huang,Yuming Zhou
Novel optically active and racemic poly( N -propargylamides) bearing tyrosine pendants (LPT, DPT, and RPT) were synthesized and characterized. The polymers possessed moderate molecular weights and were thoroughly soluble in common organic solvents. The secondary structure of these three polymers in chloroform was studied and the results indicated that LPT and DPT could adopt helical structures with predominantly one-handed screw sense according to their intense Cotton effect and large specific rotation values, while RPT adopted random coiled polymer chain. The amide groups could form amide-amide hydrogen bonds to engender the twist of dihedral angle and the strong steric repulsion of phenol groups might have the opposite effect on the helix. The helical structure of the optically active polymers were conclusively constructed and stabilized by the optimization of intra- and intermolecular hydrogen bonding and steric repulsion of the side chains. Moreover, the infrared emissivity values of LPT and DPT at 30 °C were 0.682 and 0.671, which were much lower than RPT. LPT and DPT also showed superior heat resistance due to their unique helical conformation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44824.
研究领域:
高分子化学
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材料科学
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 10
·10276-10281
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IF 1.798
Wang Zhiqiang,Wang Botong,Xu Zebo
Optically active helical polyurea@attapulgite (HPUA@ATP) composites were prepared after the surface modification of the rod-like attapulgite (ATP). Composites were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis. The results indicate that the helical polyureas have been successfully grafted onto the surfaces of the modified ATP (A-ATP) without destroying the original crystalline structure of ATP. The rod-like nanoparticles were confirmed by transmission electron microscopy. The dielectric constant and infrared emissivity have been investigated, and the results indicate that the dielectric constant value of HPUA@ATP composite has been increased to 33.62 from 25.35 (the value of bare ATP), while the infrared emissivity value of HPUA@ATP composite has been reduced to 0.39 from 0.93 (the value of bare ATP), due to the interfacial interactions between organics and inorganics and the ordered stereostructures of optically active helical polymers.
研究领域:
材料科学
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高分子化学
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纳米复合材料
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介电材料
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红外技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2026
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IF 6
Tonglu Huang,Man Wang,Xiaolei Nie,Wanting Zhu,Yu Zhang,Mingrui Liu,Wenyu Zhao
High-performance infrared (IR) radiative materials are important for energy conservation and electronic thermal management, yet effective strategies for simultaneously enhancing short- and long-wave IR emissivity remain limited. Herein, Sr-substituted barium hexaferrite (Ba 1− x Sr x Fe 12 O 19 , x = 0, 0.1, 0.3, and 0.5) powders were synthesized via chemical co-precipitation, and the effects of Sr substitution on the crystal structure, optical properties, and IR radiative performance were systematically investigated. Sr substitution at Ba sites induced lattice contraction and modified the local structural environment. The apparent optical bandgap decreased from 3.59 eV for BaFe 12 O 19 to 2.92 eV for Ba 0.7 Sr 0.3 Fe 12 O 19 . In the 2.5–5 μm band, Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.62, corresponding to a 72.2% increase relative to BaFe 12 O 19 , which is associated with the reduced apparent optical bandgap and modified surface Fe/O chemical states detected by XPS. In the 8–14 μm band, the enhanced emissivity is mainly attributed to lattice-distortion-induced changes in the vibrational response, and Ba 0.7 Sr 0.3 Fe 12 O 19 exhibited an average emissivity of 0.90, representing a 3.4% increase over BaFe 12 O 19 . In the 2.5–15 μm range, its average emissivity reached 0.80, which is 63.3% higher than that of BaFe 12 O 19 . Furthermore, the Ba 0.7 Sr 0.3 Fe 12 O 19 /PVDF composite coating achieved a 6.5 °C reduction relative to a bare Cu plate and a 3.8 °C reduction relative to a pure PVDF coating. This work provides a low-cost and scalable strategy for improving the IR radiative performance of BaFe 12 O 19 -based materials through cation substitution and structural regulation, offering a promising route for thermal management in next-generation electronic devices.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Li Wan,Yan Yang,Chao-Hua Xue,Xiao-Jing Guo,Pan Lu,Jing-Jing Peng
A robust superhydrophobic coating with high solar transmittance and strong infrared emissivity. • The coating exhibits over 90% transmittance, above 92% infrared emissivity and a water contact angle over 164°. • The PV modules coated with this coating lower operating temperature by 1.21 °C and enhance output voltage by 2.57 mV. • After self-cleaning, the temperature reduction is enhanced to 2.36 °C and the voltage gain increases to 18.02 mV. Dust accumulation and operational overheating severely degrade the efficiency and energy yield of photovoltaic (PV) panels. Although superhydrophobic coatings enable self-cleaning and radiative cooling aids heat dissipation, integrating high transparency, robust superhydrophobicity, and strong mid-infrared emissivity into a single durable coating remains challenging. Herein, we report a transparent, superhydrophobic, highly emissive coating (TSEC) fabricated by scalable layer-by-layer spraying, constructed via crosslinking octadecylamine-modified silica nanoparticles with polyhedral oligomeric silsesquioxane and epoxy resin to form a robust chemically bonded network. The TSEC exhibits 90.23% average transmittance in the PV absorption band (0.4–1.15 μm), 164.6° water contact angle, and 92.13% average emissivity in the atmospheric window (8–13 μm), with excellent durability against UV irradiation, mechanical abrasion, and chemical corrosion. When deployed on PV panels, this multifunctional coating enables synergistic self-cleaning and passive cooling, and these performance advantages are significantly enhanced for contaminated PV panels after self-cleaning, with a temperature reduction of 2.36 °C and a voltage increase of 18.02 mV. This work provides a practical, scalable material strategy to concurrently address PV soiling and overheating, laying a foundation for high-performance, low-maintenance solar technologies. Download: Download high-res image (99KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
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2026
·
IF 6
Binghao Wang,Yuzhi Zhang,Xinyu Wang,Jiayu Ma,Lingnan Wu,Changchun Chen
La-based perovskite oxides with configurational entropy increasing from low to high, namely LaMnO 3 , La(Mn 0.5 Fe 0.5 )O 3 , La(Mn 1/3 Fe 1/3 Co 1/3 )O 3 , La(Mn 0.25 Fe 0.25 Co 0.25 Ni 0.25 )O 3 , and La(Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 )O 3 , were synthesized by a solid-state reaction method, and their phase evolution, microstructure, and infrared (IR) radiation properties were systematically investigated. X-ray diffraction and transmission electron microscopy reveal that increasing configurational entropy at the B-site induces a structural transformation from R-3c to Pm-3m and eventually back to a stabilized R-3c phase in the five-component system, accompanied by lattice distortion and suppressed elemental segregation. Room-temperature spectral emissivity measurements show that the R-3c phase exhibits superior IR emission compared to the Pm-3m phase in the 2-8 μm range. Notably, at elevated temperatures (600-900 °C), the emissivity of LMFCNCO increases with temperature, reaching 0.910 at 900 °C, while the binary oxide LaMnO 3 exhibits a marked decline. X-ray photoelectron spectroscopy indicates that the high entropy design promotes mixed-valence states of B-site cations and a high concentration of oxygen vacancies, which enhance small-polaron hopping and carrier absorption at high temperatures. This work demonstrates that entropy engineering is an effective strategy for tailoring the high temperature infrared radiation performance of perovskite ceramics, offering promising candidates for thermal management and energy conversion applications.
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高影响因子
CERAMICS INTERNATIONAL
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2026
·
IF 6
Liyang Xue,Xin Wang,Tao Chen,Huimin Xiang,Minzhong Huang,Liyan Xue,Ting Zhou,Fan Yang,Heng Chen
Infrared radiative materials are pivotal for thermal management in aerospace, industrial furnaces, and refractory linings, yet conventional ceramics often struggle to combine high infrared emissivity with high melting temperature. This work employs a high-entropy strategy to tailor the properties of hexaborides. Compared to LaB 6 , the designed high-entropy hexaborides (Sr 0.2 La 0.2 Ce 0.2 Eu 0.2 Yb 0.2 )B 6 and (Ba 0.2 La 0.2 Pr 0.2 Eu 0.2 Dy 0.2 )B 6 exhibit a significant increase in the infrared emissivity (from 81.40% to 83.82% and 85.49% over 1.28–25 μm respectively). Both samples exhibit a dramatic decrease in the electrical conductivity (11501.5 and 13016.3 S cm −1 respectively), approximately an order of magnitude lower than that of LaB 6 (112359.6 S cm −1 ). The pronounced lattice distortion intensifies electron scattering, which lowers both electrical conductivity and electronic thermal conductivity. The accompanying reduction in the relaxation time further alters the intraband dielectric function. These combined effects synergistically enhance the infrared emissivity of the hexaborides. The study thus demonstrates a novel and effective approach for designing advanced thermal management materials.
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ACS Photonics
·
2025
·
IF 6.7
Haixiao Xu,Yichi Zhang,Yousheng Zou,Zhi Li,Yu Gu
Recent advances in micro- and nanophotonic fabrication techniques have enabled precise control over thermal emissivity, unlocking a variety of intriguing applications. With self-adaptive features, dynamic tunability promises transformative potential but often depends on specialized materials with infrared optical properties responsive to external stimuli, limiting material choices and design flexibility. Herein, we introduce a new framework for dynamic emissivity modulation that exploits the phase-dependent energy dissipation, where the electromagnetic phase controls the amplitude of the total electric field and, consequently, the dissipation rate of the thermal emitter near metallic surfaces. Employing a bilayer system composed of Ag2Se quantum dots (QDs) and a LiF spacer layer on a metallic substrate, we experimentally demonstrate a tunable range of spectral emissivity (Δϵλ) of ∼0.7 and a tunable range of total integrated emissivity in the 8–13 μm waveband (Δϵ) of ∼0.5. The theoretical result also suggests that a dynamic range of the total emissivity as large as 0.6 is feasible by replacing the spacer layer with thermal-responsive polymers, electroelastic materials, magnetoelastic materials, or other phase modulating layers. This design provides a versatile platform for integrating various stimuli-responsive materials to enable dynamically tunable thermal emissivity, paving the way for advanced applications in self-adaptive thermal management and smart thermal systems.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Jingxuan Cui,Jiao Wu,Aihu Feng,Yang Yu,Le Mi,Yun Yu
As a novel material with low infrared emissivity, Ti 3 C 2 T x MXene is promising in infrared stealth. However, the problem that MXene is easily oxidized poses a great challenge to its practical applications. In this paper, a tannic acid (TA) enhanced MXene oxidation stability composite film with low infrared emissivity is reported. TA effectively diminishes the pore size within the MXene film and leads to a tight and orderly arrangement of nanosheets, maintaining the low emissivity properties of Ti 3 C 2 T x MXene itself. In addition, TA reacts preferentially with H 2 O/O 2 entering the film to consume the oxidizing source, while also being able to form coordination with Ti atoms for protection against oxidation, resulting in the composite film exhibiting excellent oxidation resistance. Remarkably, there is no formation of TiO 2 and the emissivity only rises from 0.16 to 0.18 after 72 h in the humid heat environment. Even after prolonged exposure to 20-day humid heat, it still maintains exceptional infrared emissivity (0.24) and stealth performance (reducing the radiant temperature of the object from 94 °C to 47.4 °C, △T = 46.6 °C). In contrast, the original Ti 3 C 2 T x MXene film has lost its infrared stealth performance after 10-day humid heat (△T = 5.3 °C) with an infrared emissivity of 0.76. This paper provides a new strategy to solve the problem of MXene performance stability in humid and oxidizing environments.
研究领域:
材料科学
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纳米技术
·
表面化学
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2014
·
IF 2.2
Xiaohai Bu,Yuming Zhou,Tao Zhang,Yongjuan Wang,Zewu Zhang,Man He
Optically active substituted polyacetylene@multiwalled carbon nanotubes (SPA@MWCNTs) nanohybrids were fabricated by wrapping helical SPA copolymers onto the surface of modified nanotubes through ester bonding linkage. SPA copolymer based on chiral phenylalanine and serine was pre-polymerized by a rhodium zwitterion catalyst in THF , and evidently proved to possess strong optical activity and adopt a predominately one-handed helical conformation. Various characterizations including Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) demonstrated that the SPA had been covalently grafted onto the nanotubes without destroying their original graphite structure. The wrapped SPA was found to exhibit an enhancement in thermal stability and still maintained considerable optical activity after grafting. The infrared emissivity property of the nanohybrids at 8–14 μm was investigated in addition. The results indicated that the SPA@MWCNTs hybrid matrix could possess a much lower infrared emissivity value ( ε =0.707) than raw MWCNTs, which might be due to synergistic effect of the unique helical conformation of optically active SPA and strengthened interfacial interaction between the organic polymers and inorganic nanoparticles .
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiayi Wang,Chunhao Wan,Qi Tang,Jian Xu,Nianxi Xu,Shansheng Yu,Xiaoyi Wang,Hongwei Tian
Due to the harmful influence of electromagnetic waves, electromagnetic absorption materials are being actively pursued. Herein, a one-step hydrothermal method is used to synthesize rGO/Al/CoFe 2 O 4 composites with different amounts of CoFe 2 O 4 , and their electromagnetic properties and infrared emissivity are studied in detail. The results reveal that the rGO/Al/CoFe 2 O 4 composite with a CoFe 2 O 4 content of 0.06 g possesses a minimum reflection loss (RL min ) of −68.03 dB at 15.5 GHz at a thickness of 1.38 mm, while the effective absorption broadband (EAB) and infrared emissivity are found to be 3.3 GHz and 0.63, respectively. Hence, the as-designed rGO/Al/CoFe 2 O 4 composites can be used for both wave absorption and low-infrared emissivity fields, and the proposed strategy is an effective solution for designing bifunctional wave absorption materials.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xingxing Zhang,Xiangdong Gao,Yubing Dong,Yongqing Wu,Deng Duan,Xiang Zhao,Xiaomin Li
SiO 2 is the hotspot radiative cooling material due to its selective radiation or the Mie resonance effect generated by micro/nanospheres of a specific size. Herein, we demonstrate the modulation of the infrared emissivity of the intrinsic SiO 2 at the atmospheric window by doping Mg 2+ in nanoporous SiO 2 nanoparticles via a modified stöber method. The effects of the Mg-doping on the crystallinity, morphology, infrared emissivity of the nanoparticles and the radiative cooling properties of the corresponding coatings are investigated. Results show that the Mg-doping at a level of 0.226–2.26 % can induce cristobalite nanocrystals after sintering at 1000 ℃, transform the morphology from spheres to irregular nanoporous particles, and improve the infrared emissivity up to 0.96. XPS proves the formation of Mg-O bonds and the change of the binding energy of Si 2p and O 1s, supporting the successful doping of Mg 2+ in the lattice of SiO 2 . All-inorganic Mg-doped SiO 2 coatings on FTO substrates are prepared via tape casting , which exhibit rough and porous microstructure and high solar reflectivity up to ∼86 %, with the thickness of ∼90 µm. The Mg-doping improves the radiative cooling capacity of the coatings obviously, and the best temperature reduction of 17.8 ℃ compared with the empty space is achieved, 3–5 ℃ lower than the pure SiO 2 coating and 4.5 ℃ lower than the commercial SiO 2 coating. Our work offers an effective way to modulate the infrared emission of emitter, enriching the technical measures to improve the overall performance of the sub-ambient radiative cooling devices.
研究领域:
材料科学
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纳米技术
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光学工程
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产品关联
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高影响因子
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