SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Lianbo Wang,Shilong Xing,Huabing Liu,Chuanhai Jiang,Vincent Ji
In the present work, CeO 2 nanoparticles were extra added into Ni Ti nanocomposite coating to optimize the spatial microstructures and wear properties. Before adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles distributed in forms of cluster in Ni deposits, leading to the spatial inhomogeneity of microstructures like local large grains and residual [200] fiber textures. Correspondingly, the hardness in small-grain regions was up to ~4456 ± 46 MPa, while the hardness in large-grain areas dropped to values as low as ~3493 ± 40 MPa. Besides that, inside pores and jagged surface were observable, confining the wear resistance capacity. The average hardness was ~3814 ± 279 MPa. After extra adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles homogeneously scattered throughout the whole nanocomposite coating, leading to the spatial homogeneity of microstructures and properties. Grain size steadily kept at ~40 nm and the hardness stabilized at ~4326 ± 150 MPa. Inside pores vanished, the surface became smooth, and residual [2 0 0] texture was fractured. Benefiting from the modified spatial microstructures and improved hardness, enhanced wear resistance was achieved.
研究领域:
材料科学
·
表面工程
·
纳米技术
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DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 39
·4634-4641
·
IF 2.896
Qiu Sun,Jiyu Du,Li Tian,Jianfeng Wu,Xuelin Zhang
In this paper, the catalytic activity of CeO2 NPs toward oxime oxidation was adopted for the first time to develop an electrochemical sensor with improved sensitivity toward the direct detection of organophosphorus pesticides (OPs) without electrochemical redox activity. To enhance the conductivity of the sensor, CeO2 NPs together with multi-walled carbon nanotubes (MWCNTs) were deposited onto a bare glassy carbon electrode (GCE) by the simple method of drop-casting. The electrochemical properties of the as-prepared sensor were evaluated in K3[Fe(CN)6] solution and the oxidation behavior of pralidoxime (PAM) chloride on the electrodes was characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results show that the modification of CeO2 onto the electrode not only increases the electroactive area of the electrode but also significantly increases the peak current of PAM chloride oxidation, which confirms that CeO2 has an electrocatalytic effect toward oxime oxidation. To evaluate the sensitivity of the as-fabricated sensor, the inhibition rate of PAM chloride peak current was tested in PAM chloride solution containing different concentrations of chlorpyrifos, which shows a very small detection limit of 2.5 × 10−9 M. In addition, the sensor successfully achieved a convenient and sensitive determination of OPs in vegetable extracts.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
Environmental Science-Nano
·
2018
·Vol. 5
·期 12
·2936-2944
·
IF 6.087
Xiaoying Zheng,Dan Lu,Yuan Zhang,Wei Chen,Mengqi Jin,Xiaoyao Shao,Mengmeng Yang
The increasing use of cerium dioxide nanoparticles (CeO2 NPs) has raised concerns about their potential environmental toxicity. Denitrifying phosphorus removal-aerobic granular sludge (DPR-AGS) is a distinct form of microbial aggregates. In this study, the phosphorus removal efficiencies, the metabolic intermediates of polyhydroxyalkanoates (PHA) and glycogen, the enzyme activities of exophosphatase (PPX) and polyphosphate kinase (PPK), and the microbial community of DPR-AGS under long-term exposure to CeO2 NPs (0 (the control), 1, and 10 mg L−1) in anaerobic/oxic/anoxic (A/O/A) sequencing batch reactors (SBRs) were investigated. The results showed that chronic toxicity caused by 10 mg L−1 CeO2 NPs resulted in increased reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release, which reached 176.32% and 237.35%, respectively, when compared with the control (100%). High-throughput sequencing showed that denitrifying-phosphorus-accumulating organisms (DPAOs) were more sensitive to CeO2 NPs than phosphorus-accumulating organisms (PAOs), which was in accordance with phosphorus transformations during one cycle. However, the abundance of Dechloromonas and Defluviicoccus increased from 4.68% and 3.08% (R0) to 9.95% and 7.06% (R10), respectively, indicating that the tolerance of glycogen-accumulating organisms to CeO2 NPs was stronger than that of PAOs, which was consistent with the transformation of the metabolic pathway from polyphosphate accumulation (PAM) to glycogen accumulation (GAM).
研究领域:
环境科学
·
微生物学
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DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 1
·199-205
·
IF 1.65
Zhang Wanying,Huang Yingnan,Gong Hua,Dang Fei,Zhou Dongmei
Metal dioxide nanoparticles (NPs) are produced in ever-increasing amounts and widely used in industrial, medical and consumer products. They may pose potential risks to the environment. In this study we quantitatively evaluated the phytoavailability of CeO 2 NPs, ZrO 2 NPs and SiO 2 NPs to wheat ( Triticum aestivum L.). Metal dioxide NPs showed distinct differences in uptake, with uptake rate constants of 90.2 ± 9.9, 12.2 ± 2.5, 0.4 ± 0.02 and 0.9 ± 0.1 L kg −1 h −1 for ZrO 2 NPs, CeO 2 NPs, SiO 2 NPs (13 nm) and SiO 2 NPs (25 nm), respectively. However, such difference cannot be generalized by single factor of NP characteristics and/or root damage. This study provides fundamental information for NP uptake by crop plants.
研究领域:
环境科学
·
植物学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 17
·e53788
·
IF 3
Lei Jiang,Chengkun Wu,Lu Yao,Qiuxia Dong,Guohua Wu
Regenerated silk fibroin (RSF) fibers have great application prospects in medicine, textiles, optoelectronics, and other fields. However, under the synergistic action of ultraviolet, oxygen, and water, RSF will inevitably become brittle, which will greatly shorten the service life of RSF. Therefore, it is urgent to find some methods to protect RSF from aging damage. Cerium dioxide nanoparticles have a strong ultraviolet absorption and antioxidant capacity and have been used as an anti-aging component for other biomaterials. Thus, the RSF/CeO 2 NPs hybrid fibers were successfully prepared, and a series of artificial aging tests were carried out. Mechanical property is an important index to measure the aging degree. After aging, compared with RSF, the stress of RSF/CeO 2 NPs hybrid fibers was increased by 130.47 ± 4.78 MPa, and the strain of RSF/CeO 2 NPs hybrid fibers was increased by 69.89% ± 1.37%. The results of Fourier transform infrared spectroscopy, UV–Vis, sodium dodecyl sulfate polyacrylamide gel electrophoresis discussed the protective mechanism of CeO 2 NPs, which prevent the transition from β-sheet to α-helix/random coil and the disorder of structure. Furthermore, RSF/CeO 2 NPs hybrid fibers have an excellent antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria; the antioxidant activity of RSF/CeO 2 NPs hybrid fibers is gradually enhanced in the presence of UV-light.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiang-Yu Feng,Mao-Jin Ran,Man-Man Yuan,Mei-Tong Wei,Liang Wu,Zhi-Yi Hu,Li-Hua Chen,Yu Li,Bao-Lian Su
Li-rich Mn-based layered oxides with high specific capacity and operating voltages have become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues of low initial Coulombic efficiency, poor electronic conductivity, and voltage fading due to oxygen release and transition metal rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and CeO2 nanoparticle surface modification (LMNaR@CeO2) is prepared to realize a synergistic modification effect. The doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions, which makes the layered structure more stable to reduce the effect of the phase transition. And the CeO2 nanoparticle surface modification restrains the side reactions between electrode and electrolyte, stabilizes lattice oxygen, and eases oxygen release. As a result, LMNaR@CeO2 displays a specific capacity of 196 mAh g–1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than those of LMR with a specific capacity of 159.6 mAh g–1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based cathode materials for long-lived LIBs.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-7
·
IF 6.232
Wang Jiawei,Ni Pengjuan,Chen Chuanxia,Jiang Yuanyuan,Zhang Chenghui,Wang Bo,Cao Bingqiang,Lu Yizhong
Core-shell palladium cube@CeO 2 (Pd cube@CeO 2 ) nanoparticles are shown to display oxidase-like activity. This is exploited in a method for determination of the activity of alkaline phosphatase (ALP). The Pd cube@CeO 2 nanoparticles were thermally synthesized from Ce(NO 3 ) 3 , L-arginine and preformed Pd cube seeds in water. The Pd cube@CeO 2 nanoparticles catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by oxygen. This results in the formation of oxidized TMB (oxTMB) with an absorption peak at 652 nm. Ascorbic acid (AA) is generated from the hydrolysis of L-ascorbic acid 2-phosphate (AAP) catalyzed by ALP. It can reduce oxTMB to TMB, and this results in a decrease of the absorbance. The method allows for quantitative determination of the activity of ALP in the range from 0.1 to 4.0 U·L −1 and with a detection limit down to 0.07 U·L −1 . Endowed with high sensitivity and selectivity, the assay can quantify ALP activity in biological system with satisfactory results.
Schematic illustration of Pd cube@CeO 2 core-shell nanoparticles for colorimetric determination of alkaline phosphatase.
研究领域:
生物化学
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纳米医学
·
分析化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jiajia Lian,Pei Liu,Qingyun Liu
Realizing the high value-added utilization of cheap minerals in environmental catalysis has important practical significance. Herein, four nano-scale minerals, namely halloysite (Hal) nanotubes , palygorskite (Pal) nanorods , and montmorillonite (Mon) and hydrotalcite (LDH) nanosheets , were selected for in-situ supporting CeO 2 nanoparticles (NPs) by a facile one-pot hydrothermal method. Among various nanocomposites (NCs), CeO 2 /Pal behaves the highest peroxidase-like activity, attributing to larger surface area for uniformly dispersing CeO 2 NPs and more exposed active oxygen vacancy (O vac ) defects. A novel off-on colorimetric strategy was constructed for detecting toxic L -penicillamine (LPA) and Cu 2+ ion with limit of detections (LODs) of 8.37 and 9.80 μM, respectively. Density functional theory (DFT) calculations show that the O vac defect on CeO 2 (111) surface can catalyze the heterolytic cleavage of H 2 O 2 into H 2 O and oxygen radical (•O), instead of being two hydroxyl radicals (•OH) on clean surface. It can also act as trapping site for O 2 and H 2 O adsorption, improving the oxygen affinity and hydrophilicity of CeO 2 /Pal. This study provides a feasible strategy for designing mineral-based nanozymes and an insight into the possible catalytic mechanism.
研究领域:
环境催化
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材料科学
·
生物分析化学
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DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2019
·Vol. 8
·期 16
·1900256
·
IF 6.27
Xiaomin Ma,Yan Cheng,Hui Jian,Yanlin Feng,Yun Chang,Runxiao Zheng,Xiaqing Wu,Li Wang,Xi Li,Haiyuan Zhang
Wound healing is a complex and sequential biological process that involves multiple stages. Although various nanomaterials are applied to accelerate the wound healing process, only a single stage is promoted during the process, lacking hierarchical stimulation. Herein, hollow CeO 2 nanoparticles (NPs) with rough surface and l -arginine inside ( Ah CeO 2 NPs) are developed as a compact and programmable nanosystem for sequentially promoting the hemostasis, inflammation, and proliferation stages. The rough surface of Ah CeO 2 NPs works as a nanobridge to rapidly closure the wounds, promoting the hemostasis stage. The hollow structure of Ah CeO 2 NPs enables the multireflection of light inside particles, significantly enhancing the light harvest efficiency and electron–hole pair abundance. Simultaneously, the porous shell of Ah CeO 2 NPs facilitates the electron–hole separation and reactive oxygen species production, preventing wound infection and promotion wound healing during the inflammation stage. The enzyme mimicking property of Ah CeO 2 NPs can alleviate the oxidative injury in the wound, and the released l -arginine can be converted into nitric oxide (NO) under the catalysis of inducible NO synthase, both of which promote the proliferation stage. A series of in vitro and in vitro biological assessments corroborate the effectiveness of Ah CeO 2 NPs in the wound healing process.
研究领域:
纳米技术
·
生物材料
·
伤口愈合
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
WEAR
·
2025
·
IF 6.1
Xin Xing,Kun Han,Congcong Shi,Yujuan Zhang,Shengmao Zhang,Wenjing Lou,Wenbin Kan,Xu Zhou
In this paper, the good disperse and particle size adjustability of cerium oxide (CeO 2 ) nanoparticles were achieved by solvothermal secondary growth method. The micro-pitting resistance of three CeO 2 nanoparticles (1.85 nm, 2.85 nm, 4.22 nm) in polyalphaolefin (PAO)and gear oil was evaluated by reciprocating step loading method. The results showed that micro-pitting corrosion occurred in base oil lubrication from low load to high load (150 N-350 N). After adding CeO 2 nanoparticles, at low load (150 N), 2.85 nm and 4.22 nm CeO 2 nanoparticles formed a discontinuous CeO 2 tribofilm through shear sintering to reduce the surface shear force and produce significant anti-wear effect. The 1.85 nm CeO 2 has a friction-reducing and anti-wear effect through direct contact with isolated friction pairs. The formation of micro-pitting corrosion is inhibited by the three particle sizes, and the anti-wear performance decreases with the increase of particle size. Under the condition of high load (350 N), the discontinuous single CeO 2 tribofilm spillage due to its limited load capacity, which leads to increased wear and inhibits the formation of micro-pitting. Under the condition of high load (550 N), the formula oil has a micro-pitting phenomenon. After adding CeO 2 nanoparticles, a composite tribofilm containing cerium phosphate and CeO 2 is formed through tribochemical reaction with phosphorous additives, which greatly improves the bearing capacity and anti-wear ability of the tribofilm. Even under the condition of 550 N high load, the three particle sizes of CeO 2 nanoparticles have significant anti-wear effect and low friction properties, and all inhibit the formation of micro-pitting corrosion, among which 2.85 nm particle size of CeO 2 has the best anti-wear ability.
研究领域:
纳米材料
·
摩擦学
·
材料科学
·
化学合成
·
机械工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Zeyu Cai,Chuanxin Ma,Yi Hao,Weili Jia,Yini Cao,Honghong Wu,Xinxin Xu,Lanfang Han,Chunyang Li,Heping Shang,Anqi Liang,Jason C. White,Baoshan Xing
Cerium dioxide nanoparticles (CeO2 NPs) have enzyme-like properties and scavenge excess ROS induced by stressors such as drought. However, the underlying molecular mechanisms by which CeO2 NPs enhance drought resistance are unknown. In this work, both foliar application and soil injection of CeO2 NPs were used to rice seedlings under a 30 day moderate drought (40% soil relative moisture). Foliar application of 4 mg of CeO2 NPs per pot reduced excess reactive oxygen species and abscisic acid (ABA) in rice leaves, thereby maintaining chloroplast structural integrity and photosynthetic output, ultimately increasing drought-stressed rice biomass by 31.3%. Genes associated with photosynthesis and ribosome activity provided the foundation by which CeO2 NPs enhanced rice drought resistance. Importantly, these genes were tightly regulated by ABA due to the large number of abscisic acid responsive elements in their promoter regions. CeO2 NPs also upregulated the expression of soluble sugar and fatty acid synthesis associated genes in drought-stressed rice, thereby contributing to osmotic balance and membrane lipid stability. These results highlight the potential of CeO2 NPs to enhance rice photosynthesis and drought-resistant biomolecule accumulation by regulating ABA-dependent responses. This work provides further evidence demonstrating nanomaterials have great potential to sustainably promote stress resistance and climate resilient crops.
研究领域:
植物学
·
植物生理学
·
分子生物学
·
农学
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产品关联
DOI
PubMed
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2025
·Vol. 36
·期 8
·085104
·
IF 3.4
Chengcheng Wan,Zhaoru Ban,Dan Zhang,Jiumei He,Yanju Chen,Shan Tang,Qianchun Zhang
Methyl sec-butyl ether (MSBE), a volatile organic compound, poses significant risks to both environmental safety and human health. Consequently, developing efficient sensors for the rapid and accurate detection of trace levels of MSBE is essential. In this study, we synthesized mesoporous CeO2 nanoparticles using carbon quantum dots as templates, resulting in the development of a highly sensitive cataluminescence sensor system. This sensor demonstrated an impressive linear detection range of 0.50–20 mg l−1 (R2 = 0.998) and a low detection limit of 0.08 mg l−1, coupled with a signal-to-noise ratio (S/N) of 3. We applied the mesoporous CeO2 nanoparticle sensor to measure MSBE levels in various environments, including a volatile medicine reagent freezer, laboratory gas, and a storage cabinet, which yielded concentrations of 2.07, 1.38, and 3.96 mg l−1, respectively. The sensor also exhibited excellent recovery rates, ranging from 91.1% to 110%, with relative standard deviations (RSD, n = 5) from 3.4% to 8.7%, indicating reliable performance. Additionally, gas chromatography-mass spectrometry was employed to elucidate the mechanism underlying the developed cataluminescence sensor. This study introduces a versatile approach for designing gas sensors for MSBE that not only exhibits high sensitivity and selectivity but also significantly enhances their potential applications in both industrial and environmental monitoring.
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DOI
高影响因子
危险品化学品经营许可证（带存储）