JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yi Li,Songwei Zhang,Qi Ding,Baofeng Qin,Litian Hu
Ionic liquids (ILs) are extensively used in many fields owing to their attractive characteristics. Good structure designability provides ILs an opportunity to integrate multiple functions into their structures, which could promote their industrial applications as versatile materials. In this study, three 4, 6-dimethyl-2-mercaptopyrimidine (DMMP) based phosphonium ILs were firstly synthesized. The corrosion inhibition behaviors of these ILs for mild steel in 0.5 M H 2 SO 4 aqueous solutions were investigated by electrochemical tests. Results indicated that all of the three ILs exhibited surprising inhibition efficiencies as high as 99%, even at an ultralow concentration of 0.1 mM. The ILs' adsorption behavior on surface obeys Langmuir isotherm, indicating that the ILs inhibit corrosion of mild steel by monolayer adsorption on the mild steel surface. Moreover, due to the superior adsorption capacity on steel surface, DMMP based ILs are expected have great application potentials as high-performance lubricating materials. As expected, DMMP based ILs showed excellent lubrication performances both at 30 °C and 100 °C as compared to PAO and 1-butyl-3-methylimidazolium tetrafluoroborate (LB104). Surface analyses indicated that tribofilms consist of ILs adsorption layer and tribochemical products, such as FeS, Fe 2 O 3 and organic compounds containing C O bonds, are responsible for the predominant lubrication performances. Therefore, versatile ILs designed in this paper have gathered two significant abilities for industrial applications, which are high corrosion inhibiting properties and excellent lubrication performances. This work is believed to be instructive for designing multifunctional ILs and promoting the ILs' application in industry in the future.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Zhongping Li,Yuxin Zhang,Ruiqi Zhu,Guangming Wen,Chuan Dong,Hung-Wing Li
Loading metal nanoparticles on the surface of nanosheet supports is an attractive approach to enhancing their catalytic performance. Herein, palladium nanoflowers (Pd NFs) were prepared on amino-functionalized fullerene (C 60 -NH 2 ) by hydrothermal self-assembly using ethylenediamine (EA). Reduction of Pd ions resulted in the formation of Pd nanoflowers with a fullerene bottom layer and Pd petals. Ethylenediamine, a functionalized fullerene precursor, afforded a nitrogen-rich fullerene that ensures strong interactions between Pd 2+ and functionalized fullerene and improves the chemical and morphological stability of the resulting Pd nanoflowers. Compared with spherical Pd nanoparticles supported on amino-functionalized fullerene (C 60 -NH 2 ), the Pd nanoflowers (Pd NFs/C 60 -NH 2 ) exhibit greatly superior activity towards the reduction of 4-nitrophenol (4-NP). The nanoflowers exhibit not only a remarkable UV–vis response for the conversion of 4-nitrophenol to 4-aminophenol (4-AP) (99% in 2.0 min) with a turnover frequency of 12.35 min −1 but also a high electrochemical sensitivity to 4-nitrophenol over a wide linear concentration range (5–1000 μM), providing a detection limit of 0.09 μM (S/N = 3) at room temperature. The excellent catalytic stability and durability of Pd NFs/C 60 -NH 2 offer promising applications in catalysis.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Tao Sun,Liran Qi,Weiwei Li,Yan Li,Xiaomin Shuai,Zhiqiang Cai,Haipeng Chen,Xiaoguang Qiao,Lufang Ma
Efficient separation of aromatic amine isomers is a challenging issue in chemical industry and environmental analysis. Here we report the use of p -amino-tetradecyloxy-calix[4]arene (C4A-NH 2 ) as a novel stationary phase for gas chromatographic (GC) separations. The statically coated C4A-NH 2 capillary column showed a high column efficiency of 4332 plates/m for a 0.25 mm ID column and medium polarity. The C4A-NH 2 stationary phase exhibited an excellent separation performance both for aromatic amine isomers and a complex mixture of aliphatic analytes with a wide ranging polarity, showing distinct advantages over the commercial polysiloxane stationary phases via diversified molecular interactions covering H-bonding, π-π , van der Waals interactions and shape-fitting selectivity. The retention mechanisms of aromatic amine isomers on C4A-NH 2 column were further investigated by quantum chemistry calculations. In addition, the C4A-NH 2 column showed good column repeatability with relative standard deviation (RSD) values of 0.03%-0.07% for run-to-run, 0.10%-0.27% for day-to-day and 2.6%–5.7% for column-to-column, respectively, and thermal stability up to 240℃.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Hui Peng,Rui Zhao,Jing Liang,Sihan Wang,Fei Wang,Jiezi Zhou,Guofu Ma,Ziqiang Lei
Two-dimensional conducting polymers nanosheet prepared by the soft-template-assisted technique in aqueous system still has rarely been reported, especially the formation of nanosheets structure by protonic acid assisted controlling the stability of the micelles method. Herein, a facile, one-step, bottom-up approach is developed to synthesize novel and uniform conductive poly(4-aminodiphenylamine) (P(4-ADPA)) nanosheets with controlled morphology via regulating the proton acid concentration during the self-assembly of surfactant lamellar micelles. The as-produced conducting P(4-ADPA) demonstrates a integral nanoframework structure with uniform and intertwined nanosheets, resulting in a satisfactory specific capacitance of 395 F g–1 at the current density of 0.5 A g–1. Furthermore, another pseudocapacitor electrode material, urchin-like W18O49, is selected as a negative electrode material to fabricate a novel P(4-ADPA)//W18O49 asymmetric supercapacitor, which extends the operating voltage window up to 1.5 V, provides an energy density of 24.4 W h kg–1 at a high power density of 1491 W kg–1, and possesses superlong-life of 92% capacitance retention after 10 000 cycles. Therefore, the present work will propose an affordable strategy to design novel conducting polymer nanosheets and open up the possibility of cheap conductive polymers to meet the demands of energy storage.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 14
·2873
·
IF 2.217
Ruirui Han,Qiang Wu,Chihao Lin,Lingfeng Zhang,Zhicai Zhai,Ping Sun,Yingsen Fang,Jiaqiang Wu,Hui Liu
Featured ApplicationThis work provides basic data, application references and theoretical guidance of the UV/PDS process for the removal of PABA-type UV filters in water.AbstractIn this paper, the ultraviolet/persulfate (UV/PDS) combined oxidation process was used to remove the ethyl 4-aminobenzoate (Et-PABA), one of the typical 4-aminobenzoic acid (PABA)-type UV filters. The effects of various factors on the removal of Et-PABA using the UV/PDS process were investigated, and the degradation mechanisms of Et-PABA were explored. The results showed that the UV/PDS process can effectively remove 98.7% of Et-PABA within 30 min under the conditions: UV intensity of 0.92 mW·cm−2, an initial concentration of Et-PABA of 0.05 mM, and a PDS concentration of 2 mM. The removal rate of Et-PABA increased with the increase in PDS dosage within the experimental range, whereas humic acid (HA) had an inhibitory effect on Et-PABA removal. Six intermediates were identified based on HPLC–MS and degradation pathways were then proposed. It can be foreseen that the UV/PDS oxidation process has broad application prospects in water treatment.Keywords:advanced oxidation processes (AOPs);UV-activated;persulfate;ethyl 4-aminobenzoate (Et-PABA)
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Xiaoming Chen,Qishu Qu
A new magenta-to-transmissive electrochromic polymer, poly(3,4-bis(3-bromopropoxy)thiophene) (PBBrPOT) was synthesized by electrochemical polymerization and its electrochromic properties were characterized in detail. Compared with the representative “large-volume alkyl substituents” strategy, herein we use bromines as the end-capping groups of two propoxyl substituents on the 3- and 4- position of the thiophene ring to introduce more steric repulsion within the polymer chains, and therefore obtain a magenta neutral state of the polymer. The PBBrPOT film shows a set of reasonable electrochromic features, including low driving potentials (−0.1 V and 0.9 V), appropriate transmittance change (38% at 556 nm), but a relatively longer response time in bleaching process ( t 95 = 6.5 s).
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yuting Guan,Siyu Wang,Guanghua Lei,Zikang Hu,Hengye Chen,Huiwen Gu,Xiaoli Yin,Yuanbin She,Wanjun Long,Haiyan Fu
Enshi Yulu green tea (ESYL) is the most representative traditional steamed green tea in Enshi, Hubei. Different ESYL grades exhibit distinct flavors, tastes, and prices. In this study, a visual sensor based on 4-MPBA Au@AgNPs was developed for the rapid and accurate identification of ESYL grades. The recognition mechanism involved the binding of 4-MPBA Au@AgNPs with polyphenolic compounds in ESYL to form borate esters and the conversion of Ag + to Ag 0 , with the generated Ag 0 depositing on the surface of 4-MPBA Au@AgNPs. The results showed that the sensor can amplify the color differences of different grades of ESYL. The visual results were also validated by the partial least squares discriminant analysis model, demonstrating an enhancement in recognition accuracy from 68.2 % to 95.5 % compared to the original extraction solution. The colorimetric sensor developed in this study is expected to provide a new approach for traceability research of other foods.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Xiao-Chen Huang,Hao Chen,Shou-Lian Wei,Jin-Kui Ma
Sulfonamide antibiotics with superior performance are widely used in aquaculture. However, the residues of sulfonamide antibiotics in aquatic products may pose a threat to human health. In this work, a novel type of magnetic molecularly imprinted polymer (mMIP) was synthesized and coupled with ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS) for the selective separation and determination of 4 sulfonamide antibiotics residues in tilapia. The structure and adsorption properties of the polymers were characterized and evaluated. The key mMIP variables were investigated to determine the optimal magnetic solid phase extraction conditions. Results showed that the mMIPs had saturated adsorption capacities of 137.4, 78.7, 65.2, and 58.4 mg/g for trimethoprim, sulfadiazine, sulfamethazine, and sulfamethoxazole, respectively. Under optimized conditions, the linear range of the method for the detection of the 4 sulfonamides was 0.1–100 ng mL −1 ( R > 0.991), the detection limit was 0.015 μg kg −1 (S/N = 3), the recovery rate was 78.6–101%, and the relative standard deviation (RSD%) was 4.2–7.8%. This new rapid and ultra-sensitive pretreatment method was successfully applied to the monitoring of trace sulfonamide antibiotics residues in fish samples.
✓ 已验证
产品关联
DOI
高影响因子
REPRODUCTIVE BIOMEDICINE ONLINE
·
2015
·
IF 3.015
Fenju Qin,Jie Zhang,Linsen Zan,Weiqiang Guo,Jin Wang,Lili Chen,Yi Cao,Ouxi Shen,Jian Tong
The aim of the present study was to elucidate whether the GATA-4/SF-1 signalling pathway is involved in the inhibitory effects of melatonin on testosterone production in both the TM3 Leydig cell line and in C57BL/6J mice. In-vitro experiments demonstrated that melatonin treatment significantly reduced testosterone levels in cell culture medium ( P < 0.05 or P < 0.01); and decreased intracellular cyclic adenosine monophospha accumulation ( P < 0.05 or P < 0.01) and mRNA/protein expression of GATA-4 , SF-1 (NR5A1) , StAR , P450SCC (CYP11A1) and 3β-HSD ( P < 0.05 or P < 0.01). These effects were blocked by N-acetyl-2-benzyltryptamin, a melatonin receptor antagonist . Similar effects of melatonin on testosterone production ( P < 0.05 or P < 0.01) and down-regulation of transcription factors GATA-4 and SF-1 ( P < 0.01) were also observed in mice treated with intratesticular injections of melatonin. Overall, the data suggest that the inhibitory effects of melatonin on testosterone production are mediated via down-regulation of GATA-4 and SF-1 expression.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2015
·Vol. 25
·期 5
·1183-1189
·
IF 1.927
Wu Fuyong,Xu Guangjun,Zeng Xi,Mu Lan,Redshaw Carl,Wei Gang
N , N ′-bis(4-methoxysalicylide)benzene-1,4-diamine ( S1 ) was synthesized from 4-methoxysalicylaldehyde and p -phenylenediamine and it was found to exhibit interesting aggregation-induced emission enhancement (AIEE) characteristics. In aprotic solvent, S1 displayed very weak fluorescence, whilst strong emission was observed when in protic solvent. The morphology characteristics and luminescent properties of S1 were determined from the fluorescence and UV absorption spectra, SEM, fluorescence microscope and grading analysis. Analysis of the single crystal diffraction data infers that the intramolecular hydrogen bonding constitutes to a coplanar structure and orderly packing in aggregated state, which in turn hinders intramolecular C-N single bond rotation. Given that the three benzene rings formed a large plane conjugated structure, the fluorescence emission was significantly enhanced. The absolute fluorescence quantum yield and fluorescence lifetime also showed that radiation transition was effectively enhanced in the aggregated state. Moreover, the AIEE behavior of S1 suggests there is a potential application in the fluorescence sensing of some volatile organic solvents.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 53
·47966-47973
·
IF 3.289
Yao Shi,Xiaoliang Zhang,Yongmei Zhu,Hongliang Tan,Xiangshu Chen,Zhang-Hui Lu
Ag–CeO2 nanocomposites (Ag@CeO2 NCs) with a core–shell structure have been successfully synthesized through the combination of a redox reaction and the reverse micelle technique without any additional reductants or surfactants. Under a N2 atmosphere, the redox reaction automatically occurs between Ag+ and Ce3+ in an alkaline solution, resulting in the formation of Ag@CeO2 NCs by the self-assembly process. By using the XRD, FE-SEM, TEM, XPS, and ICP methods, the characterized results of Ag@CeO2 NCs show that Ag nanoparticles (NPs) with a diameter of 3–7 nm are surrounded by CeO2 NPs. Compared to CeO2 supported Ag NPs, free Ag NPs, and CeO2, the as-synthesized Ag@CeO2 NCs exhibit a superior catalytic activity and high sustainability for the hydrogenation of 4-nitrophenol (C6H5NO3, 4-NP) and 2-nitroaniline (C6H6N2O2, 2-NA) with sodium borohydride (NaBH4) in water solution at room temperature. The Ag@CeO2 NCs can achieve a complete reduction of 4-NP and 2-NA with turnover frequencies (TOF) of 138.7 and 109.8 h−1, respectively. The durability tests show that the Ag@CeO2 NCs are still highly active for the reduction of 4-NP and 2-NA, preserving 98% and 95% of their initial catalytic activity even after ten runs.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2016
·
IF 5.393
Renliang Huang,Hongxiu Zhu,Rongxin Su,Wei Qi,Zhimin He
A catalytic membrane reactor, which contains a membrane matrix and a catalytic film of alloy nanoparticle-loaded β-lactoglobulin fibrils (NPs@β-LGF), was developed for the continuous-flow reduction of 4-nitrophenol (4-NP). The Cu–Ag and Cu–Ag–Au alloy NPs were synthesized using β-LGF as a scaffold and stabilizing agent. In this process, the Cu nanoclusters were formed in the initial stage and were able to promote the synthesis of Ag0, which acts as a reducing agent for the rapid formation of Au0. Furthermore, a catalytic membrane reactor was constructed by depositing the NPs@β-LGFs on a membrane matrix. The catalytic activity of the Cu–Ag–Au alloy NPs was higher than that of the Cu–Ag alloy NPs, using the reduction of 4-NP to 4-AP as a model reaction. The observed rate constant in the continuous-flow system is also higher than that in the batch system. In addition, these catalytic membrane reactors had good operating stability and antibacterial activity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）