ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 7
·9780-9791
·
IF 4.223
Huang Wenqiu,Zhou Yuping,Zhao Ting,Tan Liju,Wang Jiangtao
In this study, the marine microalgae Skeletonema costatum and Nitzschia closterium were exposed to different forms of copper, such as a metal salt (Cu 2+ ), a nano-metal (nano-Cu), and nano-metal oxide (nano-CuO). During a 96-h exposure to nanoparticles (NPs) and salt, the cell number, Cu 2+ concentration in the culture medium, morphology, and intracellular amino acids were measured to assess the toxicity of the copper materials and the toxicity mechanism of the NPs. As results, the toxicity of Cu 2+ , nano-Cu, and nano-CuO to marine phytoplankton decreased in order. The EC 50 values of Cu 2+ and nano-Cu for S. costatum and N. closterium ranged from 0.356 to 0.991 mg/L and 0.663 to 2.455 mg/L, respectively. Nano-Cu inhibits the growth of marine phytoplankton by releasing Cu 2+ ; however, nano-CuO is harmful to microalgae because of the effect of NPs. The secretion of extracellular polymeric substances by microalgae could also affect the toxicity of nano-Cu and nano-CuO to microalgae. S. costatum was more sensitive to copper than N. closterium . Cu 2+ , nano-Cu, and nano-CuO all reduced per-cell amino acids and the total output of algae-derived amino acids by affecting the growth of the phytoplankton. This study helps to understand the risk assessment of nano-Cu and nano-CuO to marine microalgae.
研究领域:
海洋生物学
·
环境科学
·
生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2017
·
IF 0
Xiao Chen,Hua Lei,Tao Xu,Jie Zhang,Yu Qiu,Lu Tan
PMMA/nanoCu antibacterial plastic was prepared by in situ polymerization using MMA as monomer, BPO as initiator and surface treated nanoCu as antibacterial agent. AMEO was used for surface treatment of nanoCu. ATR-FTIR spectra showed that AMEO successfully reacted on the surface of nanoCu. SEM spectra showed that nanoCu dispersed evenly in the PMMA/nanoCu composite. Antibacterial test results showed that the composite had a strong antibacterial effect on Escherichia coli, and the antibacterial rate reached more than 99%. Therefore, the PMMA/nanoCu composite can be used in various fields of antibacterial plastic products.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 6
·1469
·
IF 4.183
Xuerong Zhou,Ling Zhao,Jie Luo,Huaqiao Tang,Min Xu,Yanyan Wang,Xiaoyu Yang,Helin Chen,Yinglun Li,Gang Ye,Fei Shi,Cheng Lv,Bo Jing
Research has shown that nano-copper (nano-Cu) can cause damage to the spleen and immune system yet their mechanisms of cytotoxicity are poorly understood. Our aim is to explore the potential immunotoxicity in the spleen of rats after nano-Cu exposure. The results of hematologic parameters, lymphocyte subsets, immunoglobulins, and histopathology indicated that copper obviously changed the immune function of the spleen. The levels of antioxidants (SOD, CAT, GSH-Px), oxidants (iNOS, NO, MDA), and anti-oxidative signalling pathway of Nrf2 (Nrf2 and HO-1) were strongly induced by nano-Cu. The expression of mRNA and protein of pro-/anti-inflammatory (IFN-γ, TNF-α, MIP-1α, MCP-1, MIF, IL-1/-2/-4/-6) cytokines were increased by nano-Cu. The expression of regulatory signal pathways, MAPKs and PI3-K/Akt were activated, which might be involved in the inflammatory responses and immunomodulatory processes of sub-acute nano-Cu exposure. The immune function of the spleen was repressed by nano-Cu induced oxidative stress and inflammation.Keywords:nano-Cu;rats;spleen injury;immune system;oxidative stress
研究领域:
毒理学
·
免疫学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Chuan-Jun Yue,Miao-Miao Gan,Li-Ping Gu,Ya-Feng Zhuang
Cu/ZSM-5 prepared by in situ impregnated reduction was used for the catalytic dehydration of glycerol under solvent-free conditions. The catalyst was characterized by X-ray diffraction (XRD, transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), ammonia temperature programmed desorption (NH 3 -TPD), and thermogravimetry-differential scanning calorimetry (TG-DSC) analyses. Results showed that the nano-copper in Cu/ZSM-5 was evenly distributed onto the surface of ZSM-5 pores. Under the optimum conditions of the catalytic dehydration of glycerol, conversion was 92.1 wt.%. The selectivities of acrolein and acetol were 80.4 wt.% and 11.5 wt.%, respectively. Moreover, the low temperature favored for acetol selectivity. The synergic catalysis of Cu and ZSM-5 through the enol intermediate was responsible for the selectivity in the catalytic dehydration of glycerol.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Wei Chen,Xu Liu,Zhoudong Yang,Dong Hu,Xu Liu,Xi Zhu,Xuejun Fan,Guoqi Zhang,Jiajie Fan
The power semiconductor joining technology through sintering of copper nanoparticles is well-suited for die attachment in wide bandgap (WBG) semiconductors, offering high electrical, thermal, and mechanical performances. However, sintered nanocopper will be prone to degradation resulting from corrosion in sulfur-containing corrosive environments such as offshore areas. In this study, experiments, including aging test and corrosion characterization, and simulations based on density functional theory (DFT) studies were conducted to explore the corrosion behavior and mechanism of elemental sulfur (S 8 ) and hydrogen sulfide (H 2 S) on sintered nanocopper. The experimental results indicated that loose corrosion products were observed on the sintered nanocopper during the ageing process involving S 8 , and compact layered corrosion products formed during the ageing process involving H 2 S. Furthermore, similar corrosion product compositions (Cu 2 O, Cu 2 S, CuO, CuS, and potentially Cu 2 SO 4 or CuSO 4 ) were observed in both the S 8 - and H 2 S-ageing processes. However, the S 8 -ageing process exhibited more noticeable corrosion penetration. This was explained in simulations results: the unsaturated Cu sites on the oxide layer [Cu 2 O(1 1 1)] of the sintered nanocopper could adsorb both H 2 S and S 8 , while the saturated Cu sites only exhibited the potential to adsorb S 8 .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2018
·Vol. 31
·期 10
·679-688
·
IF 1.808
Yan Yan,Chang-Ying Hu,Zhi-Wei Wang,Zi-Wei Jiang
Food contact materials contain non-intentionally added substances from degradation, and reaction processes could rise food safety problems. Three polypropylene random copolymer composite films were prepared by extruding the polypropylene random copolymer matrix with Irgafos 168, Irgafos 168 and nanocopper, Irgafos 168 and KH550 modified nanocooper, respectively. To evaluate the degradation behaviors of Irgafos 168, the films were treated by UV irradiation, microwave treatment, sunlight exposure, placed in different oxygen concentration conditions, suffered the extrusion process, and high temperature. Migration test was conducted at 20°C, 40°C, and 70°C with films tested in food simulant. GC-MS was adopted to determine the concentration of Irgafos 168 and its two degradation products, 2,4-di-tert-butylphenol (DP1) and tris (2,4-di-tert-butylphenyl) phosphate (DP2). UV irradiation significantly accelerated the degradation of Irgafos 168 compared with other treatments; DP1 and DP2 increased to maximum value at 24 hours and decreased afterwards, simultaneously. The introduction of nanocopper notably promoted DP1 generation after extrusion whereas suppressed DP2 generation which also caused a higher degradation rate of Irgafos 168 and sharp decrease of DP1 under microwave treatment, sunlight exposure, and high temperature treatment. No significant difference between the effects of nanocopper and KH550 modified nanocopper on degradation of Irgafos 168 was found. For the migration test, the introduction of nanocopper inhibited the migration of Irgafos 168 and DP2 whereas promoted the migration of DP1. No significant difference between the introduction of nanocopper and KH550 modified nanocopper on migration of Irgafos 168 and DP1, DP2 was found.
研究领域:
食品安全
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhiwei Wang,Zhi Li,Jiaojiao Bu,Juanjian Ru,Yixin Hua,Ding Wang
Cuprous sulfide (Cu 2 S) is the main composition of chalcocite and widely used in the catalyst. Deep eutectic solvents (DESs) are eco-friendly electrolytes for the separation and recycling of metals and their compounds in addition to environmental protection. In this work, choline chloride-ethylene glycol (ChCl-EG) DES is innovatively used towards one-step desulfurize cuprous sulfide to recycle copper for the first time. Cyclic voltammetry is employed to investigate the effect of initial potential, scan rate and temperature on the electrochemical behavior of Cu(I) in ChCl-EG DES. The effect of essential parameters (applied voltage, temperature and NH 4 HCO 3 ratio) on the chemical composition and microstructure of the product are discussed. Pure polycrystalline nano-Cu with an average size of ≈16.15 nm can be obtained with the current efficiency of 96.58% at the optimized parameters of 2.5 V, 353 K, 40% NH 4 HCO 3 and 10 h. The structure of Ch + is unbroken and the main existence form of Cu(I) is CuCl 2 − in the electrolyte. Mechanism analysis indicates the reduction of Cu 2 S to Cu is step-by-step with the feasible process of Cu 2 S→Cu 1.96 S→Cu 7.2 S 4 …→Cu. The S element is possibly converted and stabilized as the sulfate (SO 4 2− ) in the DES. All these findings are expected to provide new feasibility for the direct extraction and recycling of Cu from Cu 2 S with high current efficiency and less hazardous.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Dandan Zhang,Hui Ming Liu,XiuLin Shu,Jin Feng,Ping Yang,Peng Dong,XiaoBao Xie,QingShan Shi
Novel nanocopper-loaded black phosphorus (BP/Cu) nanocomposites were synthesized to synergistically exert enhanced antibacterial activities aimed at reducing antibiotics abuse. First, both BP and Cu display low biotoxicity, broadening their application in the microbiological field. Second, the unique electronic properties of BP enable BP/Cu nanocomposites to amplify antibacterial effects via interfacial charge transfer, resulting in a surge of reactive oxygen species (ROS). Third, BP/Cu nanocomposites are relatively stable, which helps to avoid the problem that nanocopper alone is highly oxidized. Finally, BP/Cu was synthesized in an environmentally-friendly manner by a one-step reduction method. The BP/Cu nanocomposites were characterized by transmission electron microscopy and atomic force microscopy. Their antibacterial properties were investigated comprehensively and discussed in detail by inhibition zone assays, dynamic growth curves, membrane potential assays, and live/dead baclight bacterial viability assays, all of which revealed the antimicrobial activities of BP/Cu nanocomposites. Absorption spectra were measured to determine which ROS species were responsible for the bactericidal mechanisms. In summary, our results demonstrated the potential of nanocomposites based on BP in antibacterial therapy due to its excellent electronic properties and outstanding biological performance. This will pave the way for avoiding antibiotic overuse and for providing security to humans and the environment.
研究领域:
材料科学
·
微生物学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
MICROELECTRONICS RELIABILITY
·
2024
·
IF 1.6
Wei Chen,Shuo Feng,Xu Liu,Dong Hu,Xu Liu,Xi Zhu,Qi Yao,Xuejun Fan,Guoqi Zhang,Jiajie Fan
Sintered nanocopper (nanoCu) paste, exhibiting excellent electrical, thermal, and mechanical performances, offers promise for interconnections in wide bandgap (WBG) semiconductors operating at higher temperatures. However, sintered nanoCu is prone to severe corrosion in environments containing H 2 S, with on-site characterization methods for the composition of corrosion products currently lacking. In this study, a novel method was proposed for the rapid characterization of corrosion products during the corrosion process based on hyperspectral imaging (HSI) technology. Sintered nanoCu samples were subjected to 336 h H 2 S gas corrosion tests with bulk Cu as the reference, followed by correlating the corrosion element content with hyperspectral characteristic parameters. Then, the morphology and composition of corrosion products were researched using focused ion beam scanning electron microscope (FIB-SEM) and transmission electron microscope (TEM) analysis. The results showed that (1) during the corrosion process, a linear relationship was established between the Cu, O elemental atomic contents on the sample surfaces and their hyperspectral characteristic parameters. (2) The elemental atomic content of S exhibited an exponential relationship with the characteristic parameter. (3) The change rate in the spectral characteristic parameters during the corrosion process reflected the severity of corrosion, which was confirmed by comparing the thickness of the corrosion products of the sintered nanoCu and bulk Cu. This study offers a foundation for the further investigation of rapid on-site characterization of sintered nanoCu corrosion involving H 2 S.
研究领域:
材料科学
·
电子封装技术
·
表面分析技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yongqian Shi,Chuan Liu,Libi Fu,Yuezhan Feng,Yuancai Lv,Zixiao Wang,Minghua Liu,Zhixin Chen
A large number of toxic fumes evolved from polymeric materials are a great threat to human evacuation. The aim of this work is to dramatically reduce the generation of smoke and toxic gaseous products upon polymers burning. A highly efficient titanium carbide/nano-copper (Ti 3 C 2 T x /Nano-Cu) hybrid smoke suppressant was synthesized by interficial adhesion and then incorporated into thermoplastic polyurethane (TPU) to fabricate TPU nanocomposites. The Ti 3 C 2 T x /Nano-Cu hybrid was homogeneously dispersed in the TPU matrix and showed a strong interfacial interaction with the TPU host. Introducing the Ti 3 C 2 T x /Nano-Cu hybrid into TPU led to enhanced high-temperature stability. Furthermore, the smoke production rate, CO production rate and total CO yield of the TPU nanocomposite containing 2 wt% Ti 3 C 2 T x /Nano-Cu hybrid decreased by 66.7%, 51.8% and 52.9%, respectively, compared with those of pure TPU. The reduced fire hazards of the TPU were due to the physical barrier, the catalytic charring and the chemical conversion of Ti 3 C 2 T x /Nano-Cu hybrid.
研究领域:
材料科学
·
消防安全
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2019
·
IF 3.63
Zi-Wei Jiang,Wen-Wen Yu,Yan Li,Lei Zhu,Chang-Ying Hu
Nanocopper with different concentrations was introduced to homopolymer polypropylene (PP-H) matrix to prepare nanocopper/PP-H composite film. Film appearance, mechanical and thermal properties were investigated. Migration test to 3% acetic acid (w/v) food simulant, film antibacterial ability and human hepatotoxicity were conducted to further evaluate film safeness. FTIR results suggest that nanocopper particles were physically dispersed in PP-H matrix and the addition of nanocopper could significantly improve thermal and mechanical properties of composite films, ensuring its potential utilization for food packaging. Also, the composite film showed great antibacterial ability including Escherichia coli , Staphylococcus aureus , Shigella castellani and Bacillus subtilis . At 70 ℃, when the initial concentration of added nanocopper reached 1% (w/w) or higher, the concentration of copper migrated from film to acetic food simulant would reach to 4.5 μg/g and would start damaging L-02 cells. This study provides important information for the potential utilization of nanocopper in food packaging films.
研究领域:
食品科学
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Zheng-Zhe Zhang,Hai-Yan Hu,Jia-Jia Xu,Zhi-Jian Shi,Yang-Yang Shen,Man-Ling Shi,Ren-Cun Jin
The increasing use of engineered nanoparticles (NPs) poses an emerging challenge to biological wastewater treatment. The long-term impact of CuNPs on anaerobic ammonium oxidation (anammox) process was firstly investigated in this study. The nitrogen removal capacity of anammox reactor was nearly deprived within 30 days under the stress of 5.0 mg L −1 CuNPs and the relative abundance of anammox bacteria (Ca. Kuenenia ) was decreased from 29.59% to 17.53%. Meanwhile, copper resistance genes associated with the Cus, Cop and Pco systems were enriched to eliminate excess intracellular copper. After the withdrawal of CuNPs from the influent, the nitrogen removal capacity of anammox biomass recovered completely within 70 days. Overall, anammox biomass showed susceptibility, resistance and resilience to the stress of CuNPs. Therefore, the potential impacts of ENPs on anammox-based processes should be of great concern.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）