Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 10
·2182-2188
·
IF 0.791
Khan Misbah Ullah,Ullah Hayat,Honey Shehla,Manan Abdul,Sarfaraz Maliha,Ullah Shaheed,Ullah Munzer,Gul Zarif
Abstract Efficient bimetallic nanostructures, which show properties related to two sole metals, have empowered inventive applications in nanosciences and nanotechnology. Here, we construct bimetallic Au@Ag nano-urchins with controlled Au tips for Catalysis and SERS application. The proposed nano-urchins were synthesized via electrochemical and simple galvanic replacement reaction route. The construction of Ag nano-flowers via electrochemical deposition use as a shell and Au tips were grown via galvanic reaction route greatly enhanced SERS properties of crystal violet (CV) detection and stability of nanostructures. In a comparison of Ag flower-like structures, the catalysis properties of Au@Ag nano-urchins are extremely efficient in degrading p -nitrophenol. As a result, these bimetallic nano-urchins show great development in SERS substrate and efficient catalysts.
研究领域:
纳米科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jianhua Lü,Yuqin Fu,Dongmei Wang,Changli Lü
Luminescent silver nanoclusters (NCs) decorated with temperature-responsive copolymer P(NIPAm-co-MQ) have been fabricated in aqueous solution as a new fluorescent pH stimuli-responsive functional materials. P(NIPAm-co-MQ) was prepared by a conventional free-radical copolymerization of isopropylacrylamide (NIPAm) as thermo-responsive units and 5-(2-methacryloylethyloxymethyl)-8-quinolinol (MQ) as coordinating groups. The obtained fluorescent Ag NCs with various sizes showed different morphologies from single sphere to chain structure induced by the copolymer ligand. Upon changing the temperature, the fluorescence intensity of the Ag NCs exhibited temperature triggered response simultaneously. The copolymer stabilized Ag NCs as a pH probe exhibited reversible pH-dependent PL properties over the pH range of 3.04–5.25. With the pH decreased, the fluorescence intensity of Ag NCs under a UV lamp decreased and it was almost completely quenched after pH 3.04. Also, the properties of this fluorescence change with pH are reversible.
研究领域:
材料科学
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
TOXICOLOGY IN VITRO
·
2012
·
IF 2.775
Jing Liu,Erqun Song,Lichao Liu,Xiaoyan Ma,Xingguo Tian,Hui Dong,Yang Song
Parent polychlorinated biphenyls (PCBs) have been shown to induce cellular oxidative stress. However, the effects of PCB active metabolites have not been extensively investigated. Parent PCBs are first converted to hydroquinone metabolites via cytochrome P-450-catalyzed hydroxylation, and the hydroquinone metabolites are then further oxidized into the corresponding quinone metabolites. Quinones are responsible for a wide range of toxic effects because of their high reactivity. Previous studies have suggested that reactive oxygen species (ROS) play important roles in multiple toxic mechanisms. In this context, the present study was undertaken to investigate oxidative stress resulting from treatment with PCB quinones in HepG2 cells. The protective effects resulting from co-administration of dihydrolipoic acid (DH-LA) were also investigated. We have found that exposure to PCB quinones leads to: (1) a decrease in cell viability; (2) an increase in both the total ROS production and superoxide production; (3) only 3Cl-PCBQ caused significant increase in the thiobarbituric acid reactive substances (TBARS) level; (4) an increase in SOD activity and a decrease in catalase activity; and (5) a decrease in GST activity and GSH level. We have also found that quinones possessing a higher number of chlorine atoms on the quinone ring display a greater activity and that DH-LA is an effective protective agent as it diminishes PCB quinone-induced cellular oxidative stress.
研究领域:
毒理学
·
细胞生物学
·
环境健康
✓ 已验证
DOI
PubMed
高影响因子
CELL BIOLOGY INTERNATIONAL
·
2021
·Vol. 45
·期 12
·2420-2428
·
IF 3.612
Chang Su,Shaoqun Liu,Xiaoying Ma,Jiajun Liu,Jianwen Liu,Ming Lei,Yiou Cao
Multidrug resistance (MDR) is the main cause of chemotherapy failure in the treatment of colon cancer and the high expression of drug efflux protein P-gp is one of the main factors of MDR. P-gp expression is regulated by the signal transducer and activator of transcription 3 (STAT3) signaling pathway. In this study, human colon cancer oxaliplatin-resistant cells were treated with oxaliplatin combined with the natural product erianin. Then, we evaluated the impact of erianin on drug resistance, and explored the relationship between erianin-related oxaliplatin resistance and the Janus kinase 2/STAT3 signaling pathway in vitro. Our research showed that erianin could significantly inhibit the proliferation of human colon cancer oxaliplatin-resistant cells, and suppress the cell cycle of oxaliplatin-resistant cells in the G2/M phase, indicating that erianin could regulate the MDR phenotype of oxaliplatin-resistant cells, and its mechanism might be the inhibition of STAT3 signaling pathway and the significant reduction of P-gp expression. However, this study provides a theoretical basis for the clinical application of erianin in platinum-based chemotherapy for colon cancer.
研究领域:
肿瘤学
·
药理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Dongxue Luo,Ronghua Qin,Minghang Song,Lingfang Xu,Tian Liang,Yalong Ge,Changping Yang
BiFeO 3 has profuse physical properties in multiferroics. However, significant leakage current constrains its utility in practical applications. In this paper, we synergistically embed BiFeO 3 nanoparticles in a ferroelectric crystal P(VDF-TrFE) base and use barrier layers to reduce the leakage current and promote the ferroelectric performance. Our finding indicate that the multilayer BiFeO 3 /P(VDF-TrFE) composite films equipped with barrier layers exhibit a leakage current below the magnitude of microampere level, a 99 % reduction compared to single-layer films. Additionally, the effective remnant ferroelectric polarization reaches 16 μC/cm 2 , a 66 % improvement. We combined the conductive mechanism analysis by fitting I - V curves and constructing energy band structures, uncovering that the essence of the optimization characteristics is related to a Space-Charge-Limited Conduction (SCLC) mechanism in the multilayer composite films. This research offers potential film solutions for a variety of electrical devices, supported by both experimental and theoretical perspectives.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hao Yang,Junbin Xie,Xiangyu Li,Zhao Liu,Guixiang Teng,Zhongli Zhao,Jie He,Chun Zhang
Given the accelerated pace of industrial development and the escalating issue of water pollution, the development of high-efficiency and energy-saving materials for the degradation of organic pollutants is imperative. Consequently, the development of heterojunction photocatalytic materials has emerged as one of the most promising strategies. In this study, n-type semiconductor ZnFe 2 O 4 nanorods and p-type semiconductor BiOI nanoflowers were utilized to construct a type p-n heterojunction ZnFe 2 O 4 /BiOI, exhibiting a significantly larger specific surface area of 38.72 m 2 /g, which is 4.6 times greater than that of ZnFe 2 O 4 (8.30 m 2 /g). The density functional theory calculations reveal that the formation of the heterojunction substantially improves the electron transport efficiency and markedly suppresses the recombination of photogenerated charge carriers, primarily due to the establishment of a p-n heterostructure. Moreover, the degradation efficiency of tetracycline achieved an impressive rate of 94.8 %. The degradation efficiency remained above 90 % following three photocatalytic reaction cycle tests.
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2021
·
IF 5.458
Qing-Nan Wang,Xianghui Liu,Kai Wang,Yan Liu,Sheng-Mei Lu,Can Li
Summary p -Methyl benzaldehyde ( p -MBA) is a class of key chemical intermediates of pharmaceuticals. Conventional industrial processes for p -MBA production involve the consecutive photochlorination, amination, and acid hydrolysis of petroleum-derived p -xylene, while producing vast pollutants and waste water. Herein, we report a direct, green route for selective synthesis of p -MBA from acetaldehyde using a diphenyl prolinol trimethylsilyl ether catalyst. The optimized p -MBA selectivity is up to 90% at an acetaldehyde conversion as high as 99.8%. Intermediate structure and 18 O-isotope data revealed that the conversion of acetaldehyde to p -methylcyclohexadienal intermediates proceeds in an enamine-iminium intermediate mechanism. Then, controlled experiments and D-isotope results indicated that the dehydrogenation of p -methylcyclohexadienal to p -MBA and H 2 is catalyzed by the same amines through an iminium intermediate. This is an example that metal-free amines catalyze the dehydrogenation (releasing H 2 ), rather than using metals or stoichiometric oxidants.
研究领域:
有机化学
·
催化
·
绿色化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 39
·394003
·
IF 3.44
Tao Fang,Yongsheng Guo,Songhua Cai,Ningsi Zhang,Yingfei Hu,Shiying Zhang,Zhaosheng Li,Zhigang Zou
Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n–p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Feng Feng,Yaoyao Zhen,Yixin Chen,Jie Luo,Chong Yao,Limei Pan,Ruihao Chen,Jiwei Wu,Chunshan Lu,Xiaoliang Xu,Qingtao Wang,Qunfeng Zhang,Xiaonian Li
Liquid-phase hydrogenation reaction of nitrobenzene to p-aminophenol (PAP) is investigated using a series of Pt-based catalysts, where activated carbon served as support and ethylene glycol (EG) as the reducing agent and solvent. Different platinum sources are employed to obtain Pt/C catalysts with different Pt metal particle sizes, as determined by transmission electron microscopy. The underlying mechanism of nitrobenzene selective hydrogenation on different size of Pt clusters have been systematically investigated. Characterization and catalytic tests show that the catalytic performance of the Pt-based catalyst is deeply influenced by particle size, where the size around 2.5 nm exhibits a suitable hydrogen absorption and activation ability, leading to the best catalytic performance. Under the optimal reaction conditions, the PAP selectivity reached 76.4 % and the conversion of NB reached 100 %. Moreover, the catalyst displayed strong recyclability with the PAP selectivity remaining above 70 % after five cycles of the catalyst, which would enable promising industrial applications.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhibiao Zhu,Yafei Hou,Tingyu Fu,Jing Cuan,Weiping Li
Given its wide application ranges, dielectric capacitors have garnered extensive attentions. However, due to the excessive premature agglomeration of free electrons, capacitors with nanocomposites as dielectrics fail to attain high breakdown strength ( E b ), and thereby constrain their ability to achieve superior energy storage performances. To alleviate the effects of free electrons and secondary impact-ionized electrons (SIE) on E b and leakage currents, here, a novel organic-inorganic core–shell Ni(OH) 2 @PDI (N@P) nanofiller with opposite double-PN-junction was well-designed and successfully synthesized by coating p-typed Ni(OH) 2 nanosheets with n-typed perylene diimide (PDI). It could reduce free electron kinetic energy and mitigate SIE amounts regardless of the applied electric field direction. Furthermore, PDI, as an organic compound, can uniformly and densely coat onto surfaces of 2D Ni(OH) 2 , as well as enhance compatibilities between Ni(OH) 2 and matrix, and thereby reducing structure defects at their interfaces. Last but not the least, Ni(OH) 2 nanosheets also contribute to E b improvement via acting as scattering centers. Experimental and simulation results concurrently affirmed positive influences of organic-inorganic N@P nanofillers on discharge energy density ( U d ) and efficiency ( η ) of P(VDF-HFP)-based (PVH-based) nanocomposites. Remarkably, 1.3 vol% N@P/PVH achieves a high U d of 21.7 J/cm 3 and η of 81.2 % under 569.0 MV/m. More importantly, it maintains an excellent energy storage performance throughout 10 4 cyclic tests. This study presents a valid strategy for concurrently improving U d and η of polymer-based nanocomposites.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
WEED SCIENCE
·
2017
·Vol. 65
·期 6
·710-717
·
IF 1.862
Pei Zhang,Han Wu,Hongle Xu,Yuan Gao,Wei Zhang,Liyao Dong
Italian ryegrass has invaded wheat fields in China and is becoming a predominant, troublesome weed. Fenoxaprop-P-ethyl has been widely used for weed control on Chinese farms since the 1990s. However, overuse has led to fenoxaprop-P-ethyl resistance in Italian ryegrass in Chinese wheat fields. In this study, we identified a putative fenoxaprop-P-ethyl–resistant population of Italian ryegrass, HZYC-6, from Henan province, China. Mutations involving Asp-2078-Gly and Ile-1781-Leu substitutions were identified in the carboxyl-transferase domain of acetyl-coenzyme A carboxylase in this population, and these mutations are the likely cause of the target site–based resistance to fenoxaprop-P-ethyl. In addition, we identified cytochrome P450–mediated metabolism of herbicides (non–target site based resistance) in the HZYC-6 population, indicating that multiple mechanisms of resistance may be segregating in this population. Furthermore, HZYC-6 was also highly resistant to haloxyfop-R-methyl and quizalofop-P-ethyl, moderately resistant to clodinafop-propargyl and sethoxydim, and had low resistance to clethodim and pinoxaden.
研究领域:
杂草科学
·
植物生理学
·
分子生物学
✓ 已验证
DOI
高影响因子
Biomolecules
·
2022
·Vol. 12
·期 7
·997
·
IF 6.064
Mingyu Jia,Zhiyuan Luo,Haomin Chen,Bianqin Ma,Li Qiao,Qinjie Xiao,Pengfei Zhang,Anming Wang
Ideal immobilization with enhanced biocatalyst activity and thermostability enables natural enzymes to serve as a powerful tool to yield synthetically useful chemicals in industry. Such an enzymatic method strategy becomes easier and more convenient with the use of genetic and protein engineering. Here, we developed a covalent programmable polyproteam of tyrosine ammonia lyases (TAL-CLEs) by fusing SpyTag and SpyCatcher peptides into theN-terminal andC-terminal of the TAL, respectively. The resulting circular enzymes were clear after the spontaneous isopeptide bonds formed between the SpyTag and SpyCatcher. Furthermore, the catalytic performance of theTAL-CLEswas measured via a synthesis sample ofp-Coumaric acid. OurTAL-CLEsshowed excellent catalytic efficiency, with 98.31 ± 1.14% yield of the target product—which is 4.15 ± 0.08 times higher than that of traditional glutaraldehyde-mediated enzyme aggregates. They also showed over four times as much enzyme-activity as wild-type TAL does and demonstrated good reusability, and so may become a good candidate for industrial enzymes.Keywords:SpyTag/SpyCatcher;carrier-free immobilized enzyme;crosslinked enzyme protein;cell lysate;tyrosine ammonia lyase;bio-orthogonal system
研究领域:
生物技术
·
酶工程
·
合成生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）