POLYMER COMPOSITES
·
2024
·
IF 4.8
Runze Jin,Baosheng Xu,Lijie Qu
The matrix cracking of carbon fiber reinforced epoxy resin based composites (CFRPs) at cryogenics (such as liquid nitrogen temperature) is a major issue affecting the normal operation of deep space and deep-sea detectors, as microcracks caused by the thermal residual stress of both can reduce the structural integrity of the devices. In this work, we report an epoxy (EP) nanofiller CuO nanorods (CuO NRs) with negative thermal expansion properties at cryogenics. Experiments showed that CuO NRs can effectively inhibit the shrinkage of EP at cryogenics and improve the mechanical properties of EP at cryogenics. A temperature dependent prediction model for the tensile strength of EP/CuO NRs was proposed, and the predicted results were in good agreement with experimental results. Finally, through a combination of experiments and theory, it was demonstrated that the tensile strength of EP/CuO NRs at cryogenics is jointly enhanced by the enhancement effect of the nanomaterials and the axial compressive thermal residual stress between EP and CuO NRs. Highlights Successfully prepared CuO nanorods with negative expansion properties at low temperatures, and found that they can effectively inhibit the shrinkage of epoxy resin at cryogenics. At cryogenics, the expansion of CuO nanorods enhances their interface effect with epoxy resin and improves the tensile strength of epoxy resin composites. The theory of tensile strength of epoxy resin at cryogenics was proposed for the first time. Theoretical analysis shows that the low temperature residual thermal stress between CuO nanorods and epoxy resin is the main factor to improve its tensile strength.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Runze Jin,Donghui Guo,Lijie Qu,Baosheng Xu
Toughening of epoxy resin (EP) is a common topic in the research of high-performance matrix for advanced composite materials. When the material is at extreme temperatures, the toughening requirements of EP will become more prominent. To this end, we designed a multi-scale interface to improve the strength and toughness of an EP at extreme temperatures simultaneously. A multi-scale interface layer was fabricated within the EP system using CuO nanorods (NRs) and epoxy-based cage-type polysiloxane (EP-POSS) as the toughening phase. By changing the content of CuO NRs and EP-POSS, regulating the multi-scale interface structure between the two, thereby further regulating the mechanical properties of the system. When the relative contents of the CuO NRs and EP-POSS were 1:1, the mechanical properties of EP/NP-CuO were optimised at room temperature(RT) and 77 K. The tensile strength increased by 75.9 % and 97.3 %, respectively, compared to the pure EP. The fracture toughnesses increased by 83.1 % and 58.9 %, respectively, compared to the pure EP. The improvement in mechanical performance is mainly attributed to the multi-scale interface structure between NP-CuO and EP, which effectively consumes the energy and stress required during deformation.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Runze Jin,Baosheng Xu,Lijie Qu
Oxide nanomaterials are widely used to enhance the mechanical properties of epoxy resins (EP) owing to their high strength and toughness. However, the stress concentration caused by agglomeration limits their performance. This paper proposes a new method to simultaneously improve the strength and toughness of EP by introducing CuO nanorods with a surface-grafted flexible linear polymer into the EP cross-linking network. This forms a rigid–flexible chain interpenetrating structure in the system, and covalent bonding with the EP network, facilitating the controllable adjustment of the crosslinking density of the system. Thus, the goal of simultaneously enhancing and toughening the EP is achieved. Experimental results show that the strength and toughness of modified BCN-CuO/EP are 91.2 and 1.77 MPa·m 1/2 , respectively, which are 76.0% and 92.3% better than those of pure EP, respectively. This study provides new insights for improving the mechanical performance of EP. Highlights The integration of CuO nanorods with flexible linear polymers (BTCI) led to a 76.0% increase in strength and a 92.3% improvement in toughness of the epoxy resin (EP), showcasing significant performance gains. The study introduced a novel “rigid–flexible” chain interpenetrating network in EP, achieved through covalent bonding, which optimally adjusts crosslinking density and mitigates stress concentration. The research highlights the effectiveness of combining CuO nanorods with BTCI in EP systems, opening new pathways for enhancing the mechanical characteristics of composite materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ling-Qi Li,Xiao-Hui Wang,Ze-Nong Zhang,Si-Mian Liu,Xiao Wang,Shu-Ni Li
Electrocatalytic nitrate reduction (NO3−RR) provides an environmentally friendly alternative to the traditional Haber–Bosch technology for ammonia (NH3) production. Herein, cupric oxide (CuO) nanorods (NRs) were synthesized by a simple one-pot method and applied as NO3−RR electrocatalysts. Due to the nanorod-like structure and large specific surface area, the CuO NR electrocatalyst exhibited excellent NO3−RR performance. The electrocatalyst experienced in situ reconstruction and its phase partly changed from CuO to Cu/Cu2O in the process of the NO3−RR. The formed Cu/Cu2O/CuO mixed valence state promoted its catalytic activity for the NO3−RR. At −0.7 V potential, the faradaic efficiency and NH3 yield could reach 94% and 28.76 mg h−1 mgcat−1, respectively, along with excellent durability for 10 h.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Qianqian Zhou,Ting-Ting Li,Jinjie Qian,Wei Xu,Yue Hu,Yue-Qing Zheng
Recently, extensive efforts have been focused on CuO materials as the non-noble metal electrocatalysts for the oxygen evolution reaction (OER). However, their catalytic efficiency is still far from meeting the need of practical large-scale water splitting because of poor electrical conductivity and limited exposed active sites. Herein, we report that amorphous NiFe layered double hydroxide film can be grown on CuO nanorod arrays supported on Cu foil (NiFe-LDH/CuO NRs/CF) to construct a core–shell heterostructure via a facile electrochemical deposition approach. The resulting core–shell heterostructure demonstrates excellent OER performance in 1 M KOH, only requiring a small overpotential of 290 mV to drive the current density of 50 mV cm–2 with a low Tafel slope of 60 mV dec–1, and maintaining a steady current density of 50 mA cm–2 for at least 35 h with negligible decline in catalytic activity, which is the best OER performance among reported CuO electrocatalysts to date. Remarkably, this catalytic performance is also superior to that of the state-of-the-art IrO2 catalyst. The prominent catalytic performance of NiFe-LDH/CuO NRs could be attributed to the synergistic effect between NiFe-LDH film and CuO NRs. As a result, our research indicates that the construction of amorphous heterostructures could be a promising strategy for development of efficient OER systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
Analytical Methods
·
2023
·Vol. 16
·期 5
·731-741
·
IF 3.1
Liyuan Yu,Mengxiao Lv,Ting Zhang,Qixin Zhou,Juanhua Zhang,Xuexiang Weng,Yongming Ruan,Jiuju Feng
Herein, we present a simple and mild method to in situ prepare CuO nanostructures for non-enzymatic glucose sensing. A Cu-metal organic framework (Cu-MOF) precursor was first directly grown on a pencil lead electrode with 3D graphene-like surfaces (EPLE) and then in situ transformed into CuO nanorods. The CuO nanorod-modified EPLE (CuO/EPLE) shows high sensitivity (1138.32 μA mM−1 cm−2), fast response time (1.5 s) and low detection limit (0.11 μM) for glucose oxidation. It has been found that NaOH promoted the generation of ˙OH groups and Cu(III) on the CuO surface, which then facilitated the electrochemical oxidation of glucose. Signals characteristic of hydroxyl and carbon-centered radical adducts were detected by EPR. Furthermore, the CuO/EPLE sensor also shows good accuracy in glucose determination in human serum samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xueyan Hu,Gaoyu Chen,Zhou Sheng,Yue Chen,Dongdong Xu,Xiangxing Xu
Circularly polarized light (CPL) photodetectors have attracted widespread interest from both the academic and industrial communities. Commonly, the key function layer of a film structured CPL photodetector is the chiral material layer that exhibits optoelectronic response differently to the left-handed and right-handed circularly polarized light. In this report, the heterostructured chiral ZnO-CuO nanorod arrays were successfully prepared by a strategy of combining the solution synthesis of ZnO nanorod arrays, grazing angle magnetron sputtering of Cu, and a thermal oxidation process. The chirality of left-/right-handedness was controlled by the sputtering angles and rotating direction. The morphology of nanorod arrays benefits light scattering and hence the absorption. The band structure of the ZnO-CuO heterojunction facilitates carrier transfer and transport. The CPL photodetectors based on the chiral ZnO-CuO nanorod arrays exhibit good performance with a responsivity (R), photocurrent asymmetry factor (gIph), responsivity asymmetry factor (gres), and photodetectivity (D*) of 13.0 mA/W, 0.038, 0.22, and 8.3 × 1011 Jones achieved, respectively, under the 450 nm circular polarized light.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xing Zhang,Yongan Hu,Daozheng Zhu,Anjian Xie,Yuhua Shen
The porous copper oxide (CuO)/reduced graphene oxide (rGO) composite was synthesized by a facile hydrothermal procedure using urea as a foaming agent. The CuO nanorods possessed vermicular pore channel with diameter of 4 nm and aspect ratio of 5:1, and were homogeneously grown on the surface of rGO sheets. The vermicular pore channel offered more sites for the storage and insertion of Li ions , as well as accelerated electrolyte diffusion and Li-ion transport. The electrochemical properties of the CuO/rGO nanocomposite as the anode material for lithium-ion battery were studied. It is found that the as-synthesized CuO/rGO nanocomposite showed an initial reversible capacity of 819 mA h/g and the specific capacity of 480 mA h/g after 50 cycles at a current density of 70 mA/g, which is due to the unique porous structure of CuO with high surface area and the presence of rGO that could improve lithium-ion mobility, shorten the distance for Li + diffusion, facilitate the transport of electrons and accommodate the large volume changes. With these outstanding performance, the CuO/rGO nanocomposite hold great promise as an advanced anode material for lithium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 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）