JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 10
·2829-2835
·
IF 2.234
Wang Mo,Yin Huanshun,Fu Zhengliang,Guo Yunlong,Wang Xinxu,Zhou Yunlei,Ai Shiyun
MicroRNAs (miRNAs), a class of small endogenous nonprotein-coding RNAs, regulate a wide range of biological processes, and their abnormal expressions are related to the growth and development of plants. Thus, a simple, rapid, and highly sensitive assay for miRNA detection is of great significance. In this work, a label-free and ultrasensitive assay for miRNA detection using protein cage nanoparticles has been developed. Apoferritin-encapsulated Cu nanoparticles (Cu-apoferritin) could be immobilized on the electrode through special reaction between amino and carboxyl. Hybridization event between the probe DNA and the target miRNA-159a is confirmed by electrochemical oxidation signal after Cu released into the detection buffer by adjusting the pH. This assay is highly selective and sensitive with a low detection limit of 3.5 fM. Moreover, the developed method can even discriminate single-base mismatched strand between the complementary targets. The effect of abscisic acid on the expression level of miRNA-159a in Arabidopsis thaliana seeds was also investigated.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changtu Ma,Bing Dai,Yanxia Wu,Ying Liu,Lin Jing,Caili Zhang,Huayun Du
In-situ grown graphene nanosheets reinforced nickel-based composites (graphene/Ni composites) always suffer from the trade-off between strength and ductility due to the poor mechanical compatibility and interfacial bonding of reinforcement/matrix components. Microalloying has been established to be an effective strategy in strengthening the graphene/Ni composites; however, the influences of alloying elements on the microstructures and mechanical properties of the composite still remain unclear. This study introduces the Cu element into the Ni matrix for achieving a co-reinforcing effect with the well-dispersed in-situ graphene nanosheets. The experimental investigations and first-principles calculation reveal that a proper concentration of Cu dopant not only improves the bonding strength of the graphene/Ni interface by a good wettability, but also causes an abnormal grain growth in the Ni matrix and thus generates a bimodal structure. Consequently, the in-situ synthesized graphene/Ni composite with 1.5 wt.% Cu exhibits the optimal strength-ductility synergy with a high yield strength, ultimate tensile strength, and fracture elongation of 276 MPa, 575 MPa, and 49.9%, respectively. Compared to the undoped composite, the enhancements in these mechanical parameters reach 32.1%, 21.6%, and 28.9%, respectively. Despite the common strengthening mechanisms, such as the effective load transfer, dislocation strengthening, twin boundary strengthening, solid-solution strengthening, and Orwan strengthening, are contribute to the tensile strength of Cu microalloying graphene/Ni composites, it is determined that the hetero-deformation-induced hardening is playing a critical role. At the same time, the bimodal structure also delays the necking and further suppresses the crack propagation in the Ni matrix, enabling exceptional plasticity.
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Jun-Feng Lu,Huan Wang,Yi Zhou,Xue-Ying Mao,Xiao-Qian Feng,Shuang Wang,Yong-Hua Zhao
Background Rhodamine B (RhB) poses a significant threat to aquatic ecosystems. While Fenton oxidation process is promising approach for RhB degradation, the conventional Fenton reaction has the narrow pH range and poor reusability. To overcome these, this study developed Fenton-like system with Fe-Cu/HZSM-5 catalyst for effective RhB degradation. Methods A series of Fe x Cu 5-x /HZSM-5 catalysts (x represents the molar ratio of Fe to Cu) were prepared by impregnation. These catalysts were integrated with H 2 O 2 to construct Fenton-like system for the degradation of RhB. The catalysts were characterized by XRD, NH 3 -TPD, XPS, FT-IR, and N 2 adsorption-desorption at low temperature techniques. Significant findings Among the tested catalysts, Fe 3 Cu 2 /HZSM-5 exhibited optimal performance, achieving near-complete RhB degradation (∼100%) under the condition of 45 °C, 5.3 mM/L H 2 O 2 , 3.0 g/L catalyst dosage, and broad pH range (2–5). Mechanistic studies confirmed that hydroxyl radicals (·OH) were the primary oxidants responsible for RhB degradation in Fenton-like system. Under ·OH attacking, RhB underwent a series of reactions such as N-deethylation and disruption of the conjugated structure and was eventually mineralized into CO 2 and H 2 O. Overall, a novel Fe-Cu/HZSM-5 catalyst was developed to address the limitations of the traditional Fenton reaction, providing valuable insights for future research in this field.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Youqin Lu,Min Wang,Cunguang Yuan,Jinsheng Zhao,Jianfeng Yu
Cyclic voltammetry (CV) was used to fabricate carbon supported Pt-Cu alloy (Pt-Cu/C) for oxygen reduction reaction (ORR) at ambient temperature. A flowerlike structure of Pt-Cu nanoparticles were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy was used to confirm the surface chemical composition and metallic state. And, electrochemical measurements such as CV, rotating disk electrode, rotating ring-disk and electrochemical impedance spectroscopy were applied to obtain the kinetic constants and the reaction mechanisms of the ORR. Compared with Pt/C, Cu/C, Pt-Cu/C exhibits the highest efficient catalytic activity for ORR, as evidenced by the highest current densities of the polarization curves, lowest onset oxidation potential and charge transfer impedance. The average electron transfer number and hydrogen peroxide calculated from RRDE are about 3.87 and 6.71%, respectively. These results show that the synthesized Pt-Cu/C has excellent electrocatalytic activity and the ORR is a four-electron dominant reduction pathway.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Huilin Hou,Minghui Shang,Fengmei Gao,Lin Wang,Qiao Liu,Jinju Zheng,Zuobao Yang,Weiyou Yang
Development of novel hybrid photocatalysts with high efficiency and durability for photocatalytic hydrogen generation is highly desired but still remains a grand challenge currently. In the present work, we reported the exploration of ternary hybrid TiO2/CuO/Cu thoroughly mesoporous nanofibers via a foaming-assisted electrospinning technique. It is found that by adjusting the Cu contents in the solutions, the unitary (TiO2), binary (TiO2/CuO, TiO2/Cu), and ternary (TiO2/CuO/Cu) mesoporous products can be obtained, enabling the growth of TiO2/CuO/Cu ternary hybrids in a tailored manner. The photocatalytic behavior of the as-synthesized products as well as P25 was evaluated in terms of their hydrogen evolution efficiency for the photodecomposition water under Xe lamp irradiation. The results showed that the ternary TiO2/CuO/Cu thoroughly mesoporous nanofibers exhibit a robust stability and the most efficient photocatalytic H2 evolution with the highest release rate of ∼851.3 μmol g–1 h–1, which was profoundly enhanced for more than 3.5 times with respect to those of the pristine TiO2 counterparts and commercial P25, suggesting their promising applications in clean energy production.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2013
·
IF 0.917
Hui LI,De-li XIAO,Hua HE,Rui LIN,Peng-li ZUO
Amino-functionalized magnetic nanoparticle (NH 2 -MNP) were prepared by a sol-gel approach. The adsorption behavior of Cu(II) ions on NH 2 -MNP was discussed systematically by batch experiments. The effects of initial Cu(II) ions concentration, time, pH and temperature were investigated. In kinetic studies, the pseudo-second-order model was successfully employed, and the pseudo-first-order model substantiated that Cu(II) adsorption on NH 2 -MNP was a diffusion-based process. Langmuir model and Dubinin-Radushkevich model ( R 2 >0.99) were more corresponded with the adsorption isotherm data of Cu(II) ions than Freundlich model. The adsorption capacity was increased with the increment of temperature and pH. NH 2 -MNP remains excellent Cu(II) recoveries after reusing five adsorption and desorption cycles, making NH 2 -MNP a promising candidate for repetitively removing heavy metal ions from environmental water samples. According to the results obtained from adsorption activation energy and thermodynamic studies, it can be inferred that the main adsorption mechanism between absorbent and Cu(II) ions is ion exchange-surface complexation.
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Yi Sun,Qiang Shen
The microstructural design offers an effective strategy for overcoming the strength-ductility trade-off in Al-based composites. In this study, we demonstrate concurrent improvements in strength and ductility of Al-Cu composites by introducing heterogeneous structures, including low-angle grain boundaries (LAGBs), stacking faults (SFs), and nano-CuAl₂. A high density of LAGBs refines Al grains by absorbing dislocation into high-angle grain boundaries (HAGBs) during deformation, which helps to suppress crack propagation under plastic deformation. The absorption of dislocations by LAGBs prevents dislocation pile-up at grain boundaries, thereby reducing stress concentration. The stacking fault network formed at the heterogeneous interface between Al and CuAl₂ effectively reduces the mean free path of dislocation motion, overcoming the Hall-Petch limit in microcrystalline grains. Nano-particles further contribute to Orowan strengthening by hindering dislocation motion. The synergistic effect of these heterogeneous structures successfully evades the strength-ductility trade-off in Al-Cu composites, providing an efficient strategy by multiscale defects to facilitate maintaining plasticity in metal-matrix composites. Employing multiscale defects provides an efficient strategy to maintain plasticity in metal-matrix composites.
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Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Sun,Aowen Chen,Wenquan Sun,Kinjal J. Shah,Huaili Zheng,Chengyu Zhu
In this work, carboxylated chitosan and acrylamide are used to synthesize a graft-modified natural polymer flocculant carboxylated chitosan-graft-acrylamide (CCSPAM) by UV-induced polymerization for copper and chromium removal. The effects of total monomer concentration, monomer mass ratio, pH value, photoinitiator concentration, and illumination time on the synthesis performance of CCSPAM were investigated regarding intrinsic viscosity (IV), grafting rate (GR), and grafting efficiency (GE). Various analytical techniques characterize the physicochemical characteristics of CCSPAM. Single factor experiments are used to investigate the effect of dosage, pH value, and reaction time on the chelation and capture of heavy metal ions by CCSPAM. The results show that the optimal IV, GR, and GE of CCSPAM achieved at total monomer concentration 30%, monomer mass ratio 1:4, pH 7.0, photoinitiator concentration 0.03%, and irradiation time 2 h are 1412.2 mL/g, 394.1%, and 84.1%, respectively. The experimental data of flocculation show that CCSPAM has a good total Cu and total Cr removal efficiency of 74.8% and 70.6% at dosage 2.0 mg/L, pH 6.0, and reaction time 2h, respectively. Fom the investigation, it is concluded that the grafted chitosan (CCSPAM) could be a be an effective and eco-friendly flocculant for removal of total Cu and total Cr ions from aqueous system.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 6
·2137-2143
·
IF 6.4
Jingshan Hou,Jianghua Wu,Zhiyu Qin,Yongzheng Fang,Leijun Shen,Xin Qiao,Langping Dong,Ganghua Zhang,Yufeng Liu,Guoying Zhao,Haijie Chen
Low-dimensional metal halides have attracted extensive attention because of their superior optoelectronic properties, high stability and structural diversity. In this work, we report a two-dimensional (2D) lead-free halide Cs2MnCl4:Cu+ as a new phosphor for white light-emitting diodes (LEDs). By doping copper(I) into manganese(II) sites, a strong green emission with a photoluminescence quantum yield (PLQY) of 70% was observed. The luminescence center was located at 530 nm and the optimal excitation wavelength was determined to be 310 nm, which suggests a large Stokes shift of 220 nm. Steady-state and transient fluorescence spectra show a decay time of 114.19 μs, indicating a self-trapped exciton (STE) emission mechanism which was further confirmed by temperature-dependent steady-state photoluminescence spectroscopy. This work suggests that manganese halides could be considered as a new family with high luminescence efficiency for optoelectronic applications.
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Analytical Methods
·
2015
·Vol. 7
·期 9
·3876-3882
·
IF 1.821
Yamei Li,Limin Zhang,Huayun Han,Xiaoli Tian,Xinxin Shi,Kai Wang,Shusheng Zhang
A new modified silica gel with alizarin complexone has been prepared and proven to act as a promising adsorbent. Ultra trace Cu(II) and Cd(II) can be selectively enriched and separated from rice and water samples by solid phase extraction and detected by FAAS. What is more, 0.003 mol L−1 and 0.25 mol L−1 of HNO3 can be used as eluent for the gradient elution of Cd(II) and Cu(II), respectively. Cu(II) could be completely separated from Cd(II) and monitored with the naked eye using color agent 5-Br-PADAP. The selectivity of the adsorbent and the effects of solution pH, type and concentration of the eluent, and foreign ions have been investigated and optimized. Under the optimized conditions, the adsorption capacity for Cu(II) and Cd(II) was 0.511 and 0.157 mmol g−1, respectively. Determination of Cu(II) and Cd(II) by FAAS was linear in the range of 1.0–200 µg L−1 and 2.5–100 µg L−1 with a detection limit of 0.21 µg L−1 and 0.46 µg L−1, respectively. Comparing the determination results for Cu(II) and Cd(II) in water and rice using the new method with those detected by ICP-MS, a considerable difference was not observed between the two methods. The method was validated with the certified reference material GBW08511 rice. Moreover, the determination of Cu(II) in the range of 20–120 µg L−1 is sensitive to the naked eye and the determination results are good in agreement with those detected by UV-Visible spectrometry. The proposed method was simple and capable of determining Cu(II) and Cd(II) in real samples accurately.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qiang Fang,Yunzhen Jia,Tao Zhao,Geng Li,Xuelei Lang,Ziyao Yang,Jianjun Ma,Dazhong Zhong,Jinping Li,Qiang Zhao
Acidic electrochemical CO 2 reduction (CO 2 RR) to high-value C 2+ products offers a promising route for CO 2 utilization. However, it still faces severe challenges: competitive hydrogen evolution reaction (HER) and slow C C coupling. To address these issues, we propose a defect engineering strategy by Fe-doped carbon nitride (FeCN) modification to reduce Cu defect formation energy, thereby inducing abundant and stable surface defects. We synthesized a magnetron-sputtered Cu nanoparticle (MSCu) catalyst modified with FeCN (MSCu-FeCN) and evaluated its performance in a membrane electrode assembly (MEA) under acidic conditions. At 500 mA·cm −2 , MSCu-FeCN achieves a remarkable C 2+ Faradaic efficiency (FE) of 73.07 % and a single-pass CO 2 conversion efficiency (SPCE) of 57.30 % with a full-cell voltage of 3.88 V, significantly superior to the original MSCu. Density functional theory (DFT) calculations, cyclic voltammetry curves, and in-situ attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy confirm that FeCN lowers Cu defect formation energy, increases surface defect density, enhances *CO intermediate coverage, thereby promoting C C coupling. This work presents a defect engineering approach enabling high-efficiency acidic CO 2 RR, while providing pivotal insights for industrial-grade electrocatalytic systems.
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PubMed
高影响因子
FUEL
·
2026
·
IF 7.8
Luqi Hu,Luyang Qiao,Jinxiang Wang,Xiguang Wang,Yong Gao,Zhangfeng Zhou,Yuangen Yao
Gas-phase dehydrocyclization of 1,4-butanediol (BDO) is an environmentally benign and sustainable route for γ-butyrolactone (GBL) production. In this work, a series of Cu-M (M = Zn, Cr) catalysts was synthesized via coprecipitation and evaluated in a fixed-bed reactor for GBL yield. Under the reaction conditions of 240 °C, 0.1 MPa, and a weight hourly space velocity (WHSV) of 2 mL∙g −1 ∙h −1 , 99.62% of BDO conversion, 99.72% of GBL selectivity, and 2.22 mol GBL ·g catalyst -1 ·h −1 of CBL formation rate were achieved over CuZnCr-600 catalyst, which is higher than reported studies. Long-term test proved that this catalyst could operate over 100 h without any deactivation. Combined microscopic and spectroscopic analysis showed that the calcination conditions affected the surface acidity-basicity of catalysts by changing the CuO content and the strength of the Cr-O bond. The Cu-M compositions significantly influenced the morphology and the electronic properties of Cu species. The incorporation of Cr led to the formation of CuCr 2 O 4 spinel structure, which not only enhanced Cu dispersion but also improved the catalysts’ resistance to sintering. The presence of Zn restrained the phase-transformation of CuCr 2 O 4 from cubic to tetragonal, which ensured the reducible property of CuCr 2 O 4 even under high-temperature calcination. Furthermore, modulating the calcination temperature and the Cu-M compositions maintained an optimal Cu + /Cu 0 ratio under reaction conditions. All these issues contributed to the high yield of GBL and the prolonged lifetime of catalysts.
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