Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Li Xiaoming,Chen Jiaxin,Yang Dandan,Chen Xi,Geng Dongling,Jiang Lianfu,Wu Ye,Meng Cuifang,Zeng Haibo
Fluorescent type nuclear battery consisting of scintillator and photovoltaic device enables semipermanent power source for devices working under harsh circumstances without instant energy supply. In spite of the progress of device structure design, the development of scintillators is far behind. Here, a Cs 3 Cu 2 I 5 : Mn scintillator showing a high light yield of ~67000 ph MeV −1 at 564 nm is presented. Doping and intrinsic features endow Cs 3 Cu 2 I 5 : Mn with robust thermal stability and irradiation hardness that 71% or >95% of the initial radioluminescence intensity can be maintained in an ultra-broad temperature range of 77 K-433 K or after a total irradiation dose of 2590 Gy, respectively. These superiorities allow the fabrication of efficient and stable nuclear batteries, which show an output improvement of 237% respect to the photovoltaic device without scintillator. Luminescence mechanisms including self-trapped exciton, energy transfer, and impact excitation are proposed for the anomalous dramatic radioluminescence improvement. This work will open a window for the fields of nuclear battery and radiography.
研究领域:
材料科学
·
核能工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2021
·Vol. 73
·期 11
·3451-3459
·
IF 2.474
Chen Ben,Li Zhi-Bo,Zhang Guo-Hua,Chou Kuo-Chih
To improve the performance of Mo-based cermets, Mo-(Ni)-Al 2 O 3 cermets were prepared with raw materials of nano-sized Al 2 O 3 powder. The effects of Al 2 O 3 and Ni additions on the densification behavior, microstructure, bending strength, and hardness of the Mo-(Ni)-Al 2 O 3 cermets were experimentally analyzed. The results showed the content of Al 2 O 3 had a great influence on the degree of densification of Mo-Al 2 O 3 cermets at the sintering temperature of 1600°C. In addition, the Al 2 O 3 particles were distributed evenly in the matrix of Mo-based cermets, which refined the grains of Mo and increased the hardness of cermets. Because of the weak interfacial bonding strength between Al 2 O 3 ceramic phase and Mo metal phase, the bending strength decreased continuously with increasing Al 2 O 3 content. However, Ni addition improved the wetting and adhesion of Al 2 O 3 and Mo. With the addition of Ni, the relative density increased, and thus hardness and bending strength were improved.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Huilian Zhou,Siming Yan,Yi He,Yi Fan,Liping Yan,Xinyu Cheng,Zhiyuan Li,Jiamin Zhong,Jinxue Song
The two-step method limits the large-scale production of superhydrophobic coatings, while low hardness limits the practical application of superhydrophobic coatings. In this study, silane-modified SiO 2 nanomaterials (SH-SiO 2 ) were prepared first and then superhydrophobic coatings were prepared by one-step electrodeposition by adding modified materials. In addition, the nonwetting properties, microhardness , mechanical stability and corrosion resistance of pure Ni coatings, Ni/SiO 2 coatings, and Ni/SH-SiO 2 coatings were compared. The contact angle test shows that the water contact angle (WCA) of the Ni/SH-SiO 2 coating can reach 153.858°. The microhardness test shows that the addition of SH-SiO 2 can effectively improve the microhardness of the coating and the microhardness of the Ni/SH-SiO 2 coating is increased by 76.14% relative to the Ni coating. When the abrasion length reaches 1000 mm, the change of the water contact angle of the Ni/SH-SiO 2 coating is kept within 5%, which helps to further promote the practical application of superhydrophobic coatings. Electrochemical impedance spectroscopy tests were used to comprehensively evaluate the corrosion resistance of the coating. The results showed that in a 3.5 wt% NaCl solution, the impedance of the Ni/SH-SiO 2 coating is an order of magnitude increase over the other two coatings. Overall, the Ni/SH-SiO 2 coatings have excellent corrosion resistance, good hardness and hydrophobicity , and their simple preparation method has positive implications for the large-scale production of superhydrophobic coatings.
研究领域:
材料科学
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腐蚀与防护
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jialong Zhu,Jieyuan Zheng,Yang Hu,Jiao Wei,Yuanchuan Ma,Haolan Gou,Hong Fan
The demand for high-transparent functional coatings with glass-like hardness, polymer-like flexibility, and anti-smudge properties has increased significantly, especially for foldable touchscreens. However, it is challenging to achieve all the required properties in a coating because the realization of these properties may conflict with each other. In this study, we present a facile method for preparing a special organic-inorganic hybrid coating by utilizing epoxy MTQ silicone resins and amine-terminated hyperbranched polysiloxane (HPSi). The chemical structure of the MTQ resin was fine-tuned to obtain the optimal M/T/Q ratio, and a novel HPSi with rich crosslinking sites and excellent flexibility was prepared as the curing agent. The resulting hybrid network imparted the coating with exceptional hardness (pencil hardness, 7–9H) and excellent flexibility (<2 mm bend diameter). In addition, by modifying the MTQ resin with fluorosilane, the surface energy of the coating was reduced to 14.8 ± 0.4 mJ/m 2 and its anti-smudge and self-cleaning properties were improved without sacrificing the transparency of the coating (99.4 % at 550 nm). Notablely, even after 1000 cycles of steel wool abrasion, these coatings still maintain their outstanding performance. This study provides a promising strategy for the development of hard, flexible, and anti-smudge coatings suitable for foldable displays and other related fields.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 8
·2404632
·
IF 12.1
Shuaihang Qiu,Ji Zou,Jingjing Liu,Weimin Wang,Jingjing Xie,Wei Ji,Jinsong Wu,Yanchun Zhou,Zhengyi Fu
Unlike strong yet tough high entropy alloys, high entropy ceramics normally exhibit good hardness but poor strength and fracture toughness. To overcome this obstacle, B 4 C-(Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 Ti 0.2 )B 2 composites with a unique hierarchical microstructure are designed and prepared by boronizing reaction sintering of dual-phase multicomponent carbides. In the as-obtained composites, massive platelet-like aggregations assembled by core-rim structured (Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 Ti 0.2 )B 2 fine grains are distributed randomly in the B 4 C matrix. Such special microstructure makes B 4 C-(Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 Ti 0.2 )B 2 composites exhibit excellent mechanical properties. An extra toughening mechanism of crack bridging is provided in as-obtained composites (fracture toughness of 4.70 ± 0.08 MPa m 1/2 ) by the interaction between cracks and platelet-like diboride aggregations whilst fine-grained microstructures guarantee high flexural strength (633 ± 25 MPa). More importantly, during producing indents, homogenization of core-rim structured (Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 Ti 0.2 )B 2 alongside more difficult lattice glides caused by short-range ordering and rough glide planes containing different-dimension transition metal atoms cooperatively induce increased indentation volume work and consequently unparalleled Vickers hardness (>54 GPa at 1.96 N), which is confirmed by in-depth transmission electron microscopy characterizations. This work gives a new inspiration to design high-performance high-entropy ceramics via multi-scale microstructure tailoring and composition tuning.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Shuxin You,Shilong Xing,Chuanhai Jiang
The synergistic mechanism of microparticles and nanoparticles on optimizing microstructures homogeneity and enhancing microhardness and corrosion resistance of mixed coatings was deeply researched by co-electrodepositing CeO 2 microparticles and CeO 2 nanoparticles into nickel matrix. Microparticles contribute to enhancing the microhardness of the coating, while nanoparticles promote the homogeneity of the microstructure, thereby improving the corrosion resistance of the coating. Therefore, by co-electrodepositing microparticles and nanoparticles into the nickel matrix, microparticles and nanoparticles in the nickel matrix generate a synergistic optimization effect, combining the advantages of microparticles and nanoparticles. Microparticles are mainly responsible for enhancing the microhardness of the coating, while nanoparticles are responsible for promoting the homogeneity of the microstructure in the coating, maintaining a homogeneous distribution of microhardness, and improving the corrosion resistance of the coating. Ultimately, the mixed coating achieves both high microhardness and excellent corrosion resistance, along with homogeneous microhardness distribution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 7
·075978
·
IF 2.6
Ning Zhong,Jean Baptiste Maniriho,Qianlin Wu,Xiaodong Wang,Yijia Gu,Wenge Li,Yuantao Zhao
This work was initiated with the purpose of expanding the utilization of nickel-based composite coatings, especially in wear and corrosion-related industrial applications. NiCoP coatings have long attracted scientific and engineering interest due to their enhanced mechanical properties reinforced by incorporation with a reinforcement phase. In the present study, NiCoP composite coatings reinforced with ZrB2 ceramic particles were synthesized by direct current deposition using a modified Watt's type bath. The microstructures of composite coatings were studied by x-ray diffraction analysis, energy dispersive x-ray spectroscopy, and scanning electron microscopy, respectively. The hardness and tribological properties of the composite coatings were evaluated and compared. The corrosion behaviors of the deposits were investigated using electrochemical spectroscopy and potentiodynamic polarization techniques in simulated seawater. The effect of ZrB2 content on the microstructures and mechanical properties of the composite coatings was explored and discussed. The present study indicates that there is a progressive enhancement in the hardness, corrosion resistance, and wear resistance of the composite coatings with the increase in ZrB2 loading. The NiCoP-12 g/l-ZrB2 coating possesses the highest microhardness and superior wear performance, while the NiCoP-6 g/l-ZrB2 coating exhibits the best anti-corrosion properties. The present study shows a cost-effective and feasible solution for the preparation of NiCoP protective coatings with enhanced properties, which holds great potential for industrial applications requiring wear and anti-corrosion protection.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Siwen Cui,Yufei Ge,Shuailing Ma,Xiaoqi Zhang,Min Lian,Xinmiao Wei,Wei Li,Cun You,Qiang Tao,Tian Cui,Pinwen Zhu
Electrically conductive silicon nitride ceramics with both high hardness and electrically conductive properties are promising advancing ceramics. However, ensuring the high hardness while simultaneously enhancing their electrical conductivity poses a great challenge. In this work, Si 3 N 4 -carbon composites with different carbon content were synthesized with diamond phase transformation method under high pressure and high temperature (HPHT). The α→β phase transition in silicon nitride enables the coexistence of α/β phases, offering a hardness of up to 23.15 ± 0.08 GPa, comparable to dense silicon nitride ceramics and significantly higher than synthesized silicon nitride-graphite composites. Diamond uniformly distributed in the silicon nitride matrix is graphitized at high temperatures to form conductive channels, reducing resistivity to 2 × 10 - ⁴ Ω∙m, over a dozen orders of magnitude lower than pristine silicon nitride. This phase transition sinter mechanism provides a method for designing conductive Si₃N₄-based ceramics with high hardness.
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
Silicon
·
2025
·
IF 3.3
Li Zhaorui,Li Zhiqiang,Wu Yonghong,Zhu Wenle,Nie Lifang,Liu Juncheng
To improve the efficiency of solar cells, antireflective films require not only high optical properties but also high mechanical properties. The antireflective films were prepared by tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) as precursors and fatty alcohol polyoxyethylene ether (AEO) as the porogen. The microstructures, optical properties, and mechanical properties of the prepared antireflective films were examined. The results indicated that the AEO volume ratio had an obvious effect on film porosity, refractive index and average transmittance. With the increase of AEO content, the film’s porosity and the average transmittance firstly increased then decreased, the refractive index firstly decreased then increased in the wavelength range of 400–1100 nm. In the meanwhile, both the film’s surface hardness and adhesion strength increased with the increasing of the AEO addition. When the volume ratio of AEO is 45%, the porosity of the film is 48%,the refractive index value for 550 nm wavelength is 1.26and the maximum transmittance is 98.50%.The highest amount of light passing through a material, also known as transmittance, is recorded at an average of 91.98%within the wavelength range of 400–1100 nm, which is 4.64%higher than that of blank glass. In addition, the hardness of the film reaches the highest level for soft films 9H, and its adhesion strength also reaches the highest level of the tape method, 0 grade.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Xindan Li,Ming Yin,Chao Xiao,Zhong Kuang,Shengquan Yu,Xiaoqiang Li,Zhuoying Jia
The co-precipitation approach was successfully used in this investigation to produce MgF 2 nanoparticles. The effects of various heat treatments on the particle size and morphology of MgF 2 nanoparticles were systematically investigated. Based on the experimental results, the powder calcined at 500 °C, having crystallites size that are typically between 80 and 120 nm in size, was identified as the optimal sample. This calcined powder was subsequently used to produce polycrystalline MgF 2 ceramics through hot pressing (HP). It was also investigated how the characteristics of MgF 2 ceramics were affected by low-pressure hot pressing. The results demonstrated that the optimal transmittance of 95.8 % was achieved at a pressure of 30 MPa and a hot-pressing temperature of 800 °C. Furthermore, the dielectric constant (ε r ), Q × f value, Vickers hardness ( H V ), and fracture toughness ( K IC ) of the samples produced at 30 MPa and 800 °C were evaluated. The dielectric constant and Q × f value of MgF 2 ceramics, measured at 13.6231 GHz, were found to be 5.2996 and 114534 GHz, respectively. The Vickers hardness was measured at 5.21 ± 0.42 GPa, and the fracture toughness was determined to be 0.842 ± 0.067 MPa m 1/2 .
研究领域:
材料科学
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Xu Feifei,Dong Xin,Jia Qian,Chen Ruoyu
Mechanical strength is an important factor that affects and limits the life of surface antireflective (ARC) coatings such as optical lenses, photovoltaic panels, and liquid crystal displays. In this work, a network-structured silica sol was prepared using tetraethyl orthosilicate (TEOS) and methyltriethoxysilane as silicon sources. Triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane (C 4 FTES) was used to modify the acid-catalyzed silica sol. Finally, the mixed sol was plated on the surface of polymethyl methacrylate by impregnation-pulling method. The coating obtained after drying at 100°C showed a maximum transmittance of 97.98% in the visible wavelength range (400–800 nm). The coating still maintained good optical properties after undergoing various wear-resistant tests such as sandpaper abrasion and cotton ball friction. Moreover, the pencil hardness test of the coating improved from 5B to 3H after it was modified by short-chain perfluoroalkyl groups (C 4 FTES). This work required only low-temperature treatment without calcination to prepare a silicon-based ARC coating formed by copolymerization of C 4 FTES and TEOS, and the mechanical properties of the coating meet actual needs. This easy-to-operate preparation method greatly expands the application scope of silicon-based ARC coatings in the field of heat-sensitive materials. Graphical abstract The polymethyl methacrylate (PMMA) substrate is coated with a fluorine-containing coating with a network structure, which greatly improves the transmittance and surface hardness of the substrate.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER METALLURGY
·
2025
·
IF 1.8
Xiao-Chun Deng,Guo-Hua Zhang
In this work, the ultra-fine grain WC-10Co alloys were prepared through a two-step sintering process comprising steps of low-temperature sintering for a long time and high-temperature sintering for a short time. The effects of sintering methods (one-step/two-step sintering) on the microstructure, density, grain size and performance of WC-10Co hard metals with or without VC addition were investigated. The densities of all samples were lower than 97.0% in one-step sintering. After two-step sintering, the relative densities of all samples were increased, and those of the samples without VC were higher than 98.5%. In addition, there are a large number of grains with a high aspect ratio in the samples without VC. The pure WC-10Co alloy showed the best comprehensive mechanical properties after long-time (2 hours) sintering at a low temperature (1300 °C) and short-time (10 minutes) sintering at a high temperature (1450 °C), and the grain size, hardness and toughness of the sample were 0.70 μm, 15.35 GPa and 13.54 MPa·m1/2, respectively. The grain size of the sample containing 0.5 wt.% VC was only 0.26 μm under the same sintering conditions, which showed a high hardness of 18.14 GPa and a toughness of 8.56 MPa·m1/2.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）