Research
·
2022
·
IF 11.036
Lin Sun,Yi Du,Haiyang Yu,Huanhuan Wei,Wenlong Xu,Wentao Xu
Neural perception and action-inspired electronics is becoming important for interactive human-machine interfaces and intelligent robots. A system that implements neuromorphic environmental information coding, synaptic signal processing, and motion control is desired. We report a neuroinspired artificial reflex arc that possesses visual and somatosensory dual afferent nerve paths and an efferent nerve path to control artificial muscles. A self-powered photoelectric synapse between the afferent and efferent nerves was used as the key information processor. The artificial reflex arc successfully responds to external visual and tactile information and controls the actions of artificial muscle in response to these external stimuli and thus emulates reflex activities through a full reflex arc. The visual and somatosensory information is encoded as impulse spikes, the frequency of which exhibited a sublinear dependence on the obstacle proximity or pressure stimuli. The artificial reflex arc suggests a promising strategy toward developing soft neurorobotic systems and prostheses.
研究领域:
神经科学
·
生物医学工程
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DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2025
·
IF 3.3
Zhang Jian,Chen Hongxuan,Pang Xiaotong,Liu Shilong,Misra R. D. K.,Sun Junhao
Currently, surface coatings on agricultural machinery are crucial for extending service life. However, achieving coating strength and toughness remains a challenge. In this paper, two types of high-hardness iron-based coatings, referred as S1 and S2, were prepared by modulating the Mo/V ratio in the Fe-C-V-Mo-B system, and their microstructural evolution and property changes were investigated. The results show that the S1 coating primarily consist of martensitic matrix, spherical VC, blocky Mo 2 B, and a small amount of skeleton-like Mo 2 B. In contrast, the S2 coating consist of martensitic matrix, petal-like VC, and skeleton-like Mo 2 B. Compared with S1, the VC volume fraction in S2 increases by 6.5%, and the Mo 2 B volume fraction increases by 16.3%. The average microhardness of S1 and S2 coatings are 737 HV 0.5 and 954 HV 0.5 , respectively, indicating that the S2 coating exhibits a 22.7% higher microhardness compared with S1. The average friction coefficients of S1 and S2 coatings are 0.434 and 0.398, respectively. Furthermore, the wear loss of S2 coating is approximately half that of S1. The fracture toughness of S1 and S2 coatings are 51.9 MPa·m 1/2 and 51.7MPa·m 1/2 , respectively. Fracture analysis reveals that the skeleton-like eutectic structure in S2 can deflect cracks generated by impact, increase the length of propagation path, and improve the toughness of coating. It allows S2 coating to achieve high hardness and wear resistance, while maintaining toughness comparable to S1 coating. This study provides a theoretical basis for the design and development of iron-based coatings with high hardness, high abrasion resistance, and impact resistance for agricultural machinery.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jie Zhou,Siyuan Jin,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Vitalii Neshchimenko,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
Microarc oxidation (MAO) coatings incorporating hexagonal boron nitride (h-BN) nanoparticles were synthesized on Mg-Li alloys. The effects of h-BN nanoparticle concentration on the structure, phase composition, and tribological properties of the MAO coatings were systematically investigated. The results indicate that the addition of h-BN nanoparticles induces the formation of protrusions on the coating surface, varied in size and distribution with the concentration of h-BN particles. The protrusions are advantageous for enhancing the wear resistance of the coating, owing to the effective reduction of the contact area and the lubricating impact of the released h-BN particles during wear. The thickness and hardness of the coating contained h-BN particles are significantly elevated. At an optimal h-BN concentration of 7 g/L, the composite coating exhibits the lowest average coefficient of friction (COF = 0.59) and the minimum wear rate (W = 2.6 × 10 −6 mm 3 /N·m), thereby demonstrating superior tribological performance.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2020
·Vol. 29
·期 7
·1784-1791
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IF 2.522
Wang Xiaoxia,Wang Xin,Huang Qun,Qin Jiahao,Suo Xinkun,McDonald André,Li Hua
Aluminium-polymethyl methacrylate-copper (Al-PMMA-Cu) composite coatings were developed using cored wire arc spraying. The bacteria Bacillus sp. was used to evaluate the antifouling performances of the coatings. The microstructures and antifouling mechanisms of the coatings were investigated and discussed. The results show that the composite coatings presented improved antifouling performances, and two antifouling mechanisms were explored. On the one hand, the Cu nano-particles were released to seawater due to corrosion of the Al components, converted to cupric ions, and killed the bacteria. Meanwhile, oxidation of Al was accelerated due to Cu-Al galvanic reaction, and the needle-like corrosion products were formed, which pierced the cell membranes and killed the bacteria. The effects of the PMMA on the electrochemical properties of the coatings were also evaluated. The results show that the sealing function of the PMMA components enhanced the corrosion resistance of the Al-PMMA-Cu coatings. This investigation shed light on one-step construction of antifouling and anticorrosion layers for marine applications.
研究领域:
材料科学
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海洋涂层
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防污技术
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腐蚀科学
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表面工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Qizhong Li,Zhangpeng Meng,Bing Xiao,Jiaojiao Li,Kai Liu,Meijun Yang,Song Zhang,Takashi Goto,Rong Tu
HfC-HfB 2 -SiC composites were prepared by arc melting using HfC , HfB 2 and SiC powder as raw materials. The ternary eutectic composition of 16HfC-17HfB 2 -67SiC (mol%) was first identified, showing a complicated maze microstructure of HfC, HfB 2 and SiC approximately 500 nm in thickness. The eutectic temperature of the HfC-HfB 2 -SiC composite was nearly 2760 K. The Vickers hardness and fracture toughness of the HfC-HfB 2 -SiC ternary eutectic composite were 20.8 GPa and 7.7 MPa m 1/2 , respectively. With increasing temperature from 300 to 800 K, the electrical conductivity decreased from 8.8 × 10 5 to 4.3 × 10 5 Sm −1 , whereas the thermal conductivity increased from 28 to 32 W m −1 K −1 .
研究领域:
材料科学
·
冶金学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2017
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IF 3.094
Kejia Kang,Lianmeng Zhang,Guoqiang Luo,Jian Zhang,Rong Tu,Chuandong Wu,Qiang Shen
In this work, to improve the strain capacity of tungsten , β-SiC was added to form W-Si-C multi-phase composites composed of W, W 2 C, and W 5 Si 3 using the arc-melting method. The relationship between microstructure and mechanical behavior was investigated, and a microstructural evolution mechanism was proposed. The grain size of the W was refined significantly from 1071.8 to 5.4 µm as the SiC content increased. The micro-hardness (3.67–12.79 GPa) and ultimate compressive strength (UCS) (0.90–2.29 GPa) of the W-Si-C multi-phase composite obviously increased as the β-SiC content increased to 4 wt% due to the grain refinement and segregation of the W 2 C and W 5 Si 3 at the grain boundaries. The highest strain of UCS (21.9%) was obtained at 1 wt% SiC, which is three times of that of pure W (7.4%) and is a result of the refined W grain size and the potentiation of W 5 Si 3.
研究领域:
材料科学
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力学
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产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 19
·9127
·
IF 2.679
Tianji Liu,Yitong Wang,Junguo Li,Qing Yu,Xiaoman Wang,Di Gao,Fuping Wang,Shuang Cai,Yanan Zeng
The effects of Ca2+in converter slag and electric arc furnace slag leaching solutions on CO2content, the effects of CO2content in solutions on the accumulation of chlorophyll a ofNannochloropsissp., and the mechanisms were studied. Results showed that addition of 50 mg/L converter slag leaching solution and 400 mg/L electric arc furnace slag leaching solution (lower than 50 vol% concentration) promoted the accumulation of chlorophyll a ofNannochloropsissp., while an increased concentration of 70 vol% inhibited its accumulation. The highest concentration of chlorophyll a was obtained on the addition of 10 vol%. With 10 vol% leaching solutions added, chlorophyll a concentration for converter slag reached 4.2 mg/L, 1.45 times as much as that of pure F/2 medium, and chlorophyll a concentration for electric arc slag reached 3.2 mg/L, 1.10 times as much as that of pure F/2 medium. Under the same addition proportion, the promoting or inhibiting effect from converter slag on the accumulation of chlorophyll a ofNannochloropsissp. was more obvious than that for electric arc furnace slag. The reason for the promotion of chlorophyll a accumulation ofNannochloropsissp. was that an increase of Ca2+in the solutions led to an increase of CO2, thereby promoting the photosynthetic rate of microalgae. The study provided new ideas for the green application of solid waste and industrial production of microalgae.Keywords:leaching solutions;converter slag;electric arc furnace slag;Nannochloropsissp.;chlorophyll a;CO2content
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tianhui Wang,Jiang Xiao,Xiaoli Yang,Yonghui Zhao,Rui Hu,Jianjun Ding,Yi Gong,Xingyou Tian
Encapsulation of plasmonic nanoparticles in nanoshells is a promising strategy to overcome their oxidation-coalescence in the heterogeneous catalysis process. Tailoring of nanostructure/functionality to enable the efficient synergistic integration of core and shell is highly desired to enhance the plasmonic catalysis. This study applied a one-step arc discharge to design graphite-encapsulated silver (Ag@G) catalysts with tunable morphologies (14.3–46.9 nm of cores, 1.38–3.43 nm of shells) and surface functionalities (hydrophobization, or amination with maximum 2.70 × 10 17 /mg of Ag@G). Highly nanostructure/functionality-dependent catalysis of aquatic pollutants was established. Specifically, tailoring defective shells with thinner thickness enabled the efficient synergism of strong π-π coordination of 4-nitrophenol and effective electron transfer of donors. Aminated Ag@G with ultrathin shells presented an optimal reduction for Cr(VI), establishing a negative relation of thickness with formic acid-induced reduction. Amino with proper densities (9.6–20.9/nm 2 ) induced the capture of Cr(VI) ultrafast. Moreover, reductive N heteroatoms with proper densities ( e.g. , 27.7 of N/nm 2 ) provided abundant lone pair electrons without the dramatic decline of conductivity, ensuring a favorable reduction of Cr(VI). Since arc discharge was versatile for the industrial production of nanomaterials, our work would trigger a new upsurge to arc-design nanostructures/functionalities for the catalysis and decontamination.
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Yonghui Zhao,Xiaoli Yang,Xiang Meng,Rui Hu,Xiaoliu Duan,Zhengya Gan,Jianjun Ding,Yi Gong,Xingyou Tian
Encapsulation of Cu nanoparticles by carbon chain mail is a promising approach to extend the service endurance. However, the diffusion of oxygen across the surfaces and interfaces of Cu nanoparticles (NPs) may induce obvious changes to their surface compositions, thereby dramatically altering catalytic properties . Here we reported an unanticipated boosting catalytic activity of graphitic chain mail-encapsulated Cu nanocatalysts (1.3- to 6.8-fold enhancement from initial 1.6–13.4 s −1 g −1 to stable 6.6–21.5 s −1 g −1 ) for the reduction of 4-nitrophenol by simply immersing these NPs in water for 10 days without any further treatment. The graphitic shells were arc-converted from sixteen types of biomass residuals and polymeric wastes. The rising catalytic activity was attributed to the temporal formation of Cu 2 O at the interface of Cu core and graphite shell, which was derived from the diffusion of dissolved oxygen across the defective graphitic chain mail. The increment of catalytic activity was linearly related with the rising content of Cu 2 O. The monotonous relations of initial and enhanced activities with shell thickness and interfacial composition of NPs were also well established. This work provides a new insight into the interfacial manipulation of core/shell nanocatalysts, and paves a versatile path for the high value-added utilization of carbon wastes.
研究领域:
材料科学
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催化化学
·
环境科学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Wenxian Nie,Mingzhe Xiang,Leiting Yu,Yun Zhao,Chen You,Minfang Chen
To improve contact corrosion between auto parts of magnesium alloy and steel rivets during cold connection, a polytetrafluoroethylene (PTFE)-micro-arc oxidation (MAO) composite coating (PTFE-MAO) was prepared on 10B21 steel in the electrolyte consisting of aluminate and phosphate in this work. PTFE carrying anionic surfactant drills into the discharge channel due to the electrostatic adsorption of anions and cations, which plays a role in plugging holes. It shows that PTFE concentration has a significant effect on phase composition, surface microstructure morphology, and corrosion property of MAO coatings. In particular, for the PTFE concentration of 6 g/L, it greatly improves the coating's corrosion resistant , wear resistance, and hydrophobicity . In addition, glycerol (C 3 H 8 O 3 ) with 2 mg/L was added to the electrolyte containing PTFE to obtain a composite coating, the corrosion resistance of which is significantly improved, and the decrease in salt spray corrosion rate is doubled compared to the MAO coating. This approach provides a reference for preparing multifunctional anticorrosion coatings on steel substrates.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zhiyuan Guo,Jingfu Song,Guoqing Wang,Gai Zhao
The 2A12 aluminum alloy is widely utilized in aerospace, automotive, and marine engineering due to its excellent strength-to-weight ratio and good machinability. However, its wear and corrosion resistance under harsh conditions are insufficient and require improvement. This study combined micro-arc oxidation (MAO) with paraffin sealing to enhance the corrosion resistance and tribological properties of 2A12 Aluminum Alloy. The results indicate that the MAO process significantly increases hardness and tribological properties, but the porosity into the oxidation layer may accelerate corrosion in corrosion environments. Paraffin sealing effectively fills these pores, reducing the penetration of corrosive agents and significantly improving corrosion resistance. Additionally, friction tests show that the hybrid coating after paraffin sealing exhibit a lower friction coefficient and wear rates. Molecular dynamics simulations (MD) further reveal the distribution of paraffin within the pores and its effect on wear and corrosion resistance. This study demonstrates that MAO combined with paraffin sealing is an effective approach to enhancing the corrosion and tribological properties of 2A12 aluminum alloy, providing new insights for its 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
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Junyao Wang,Lixiang Li,Huan Liu,Qi Hou,Guanjun Zhu,Hongxu Pan,Yahao Liu,Yansong Chen,Guangzhe Gao,Taipeng Wang,Yaqun Li,Dingyi Ren
Flexible sensors are an important part of flexible electronic devices, and its application often relies on external power sources . However, traditional commercial batteries require repeated charging, lack of flexibility and potential leakage of electrolyte contamination, which seriously hinder the wearable smart electronic devices' develop of comfortable and portable integration. To overcome this key challenge. This paper combines energy harvesting technology, distributed energy storage devices and flexible electronics. This proposes a modular layout of friction nanogenerator (TENG), miniature solid-state supercapacitor (MSSC) and strain sensor. Three of modular components are constructed on a thermoplastic polyamide film. The basic conductive network is prepared through screen printing technique and graphene multiwall carbon nanotubes (G-MWCNTs) conductive inks . The TENG module is used to collect low-frequency and high-entropy mechanical energy from the surrounding environment for conversion into AC electrical energy. The MSSC module is used to store the electrical energy generated by the TENG and to continuously power the back-end flexible electronics. The strain sensor module has an asymmetric interlaced double-arc snake rib conductive structure inspired by the spotted snake. It enables multi-dimensional strain detection and ultra-sensitive sensing performance. Finally, as a concept proof, the prepared TENG, MSSC and strain sensors are composed to form a self-powered multimode distributed flexible sensing device. It can be used for human health monitoring in the areas of knuckle, elbow, hip and heel nodes.
研究领域:
材料科学
·
生物医学工程
·
能源技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）