JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 31
·期 3
·2231-2239
·
IF 2.195
Zhao Gao-yu,Le Meng-ting,Zeng Gui-ju,Zhang Yu,Li Jin-hai
A new and rapid synthetic method toward polymer phenylethnylcopper (PPECu) nanowires is developed. PPECu nanowires have been firstly fabricated through using ascorbic acid instead of methanol as reducing agent. The preparation time of PPECu can be decreased from 48 to 2 h, even at a lower temperature. Ag/PPECu nanocomposites were prepared by the in situ reaction of PPECu and Ag (NH 3 ) + 2 ions with different concentrations. Ag/PPECu photocatalysts showed high visible-light H 2 production activity, which originated from the combined action of electrons transfer, sacrificing reagent and SPR effect of Ag nanoparticles.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 36
·期 5
·940-945
·
IF 1.071
Shi Chengying,Yang Jiayu,Liu Yang,Wang Yanmiao,Xu Wenge,Xu Yiquan,Hu Wei,Liu Baijun
The surface-modified Al 2 O 3 particles were introduced into polyethylene(PE) to enhance the thermal conductivity, and PE/Al 2 O 3 cross-linked networks with improved thermal and mechanical properties were prepared through electron beam(EB) irradiation technology. The incorporation of reactive irradiation sensitizer was useful in fabricating a high degree of cross-linking(DC) PE networks under a low irradiation dose. In the PE sample containing 2% sensitizer, DC ca. 67.1% could be obtained under 60 kGy(1 kGy=1000 J/kg). EB-irradiation greatly improved the tensile stress of PE-based samples, and the tensile stresses of the samples with 0.2%—5% TMPTA(trimethylolpropane triacrylate) under 60 kGy were 24.61—27.77 MPa. All the EB-irradiated samples had higher Vicat softening temperatures than the samples without irradiation. After treatment at 120 kGy, the Vicat softening temperatures of PE-Al 2 O 3 -44/ TMPTA-2 increased from 127 °C to 130.4 °C. SEM images revealed that PE-Al 2 O 3 -50 samples with increased amount of Al 2 O 3 particles showed a conduction “pathway,” and thermal conductivity reached 0.67 W/(m·K). Thus, high-performance pipes were successfully extruded, which could satisfy the static hydraulic blasting test and exhibit improved thermal conduction capability.
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CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·325-333
·
IF 1.835
Guo Yu-Hua,Pan Guo-Xiang,Xu Min-Hong,Wu Tao,Wang Yong-Ya
Adsorption desulfurization is a potential new method for deep desulfurization of fuel oil. The development of adsorbents with high adsorption capacity and selectivity is the core of deep adsorption desulfurization. The adsorption behavior of thiophene in MCM-41 mesoporous materials modified by various metal ions was studied in order to understand the adsorption desulfurization process of molecular sieves. The Fe-, Co-, and Zn-modified MCM-41 materials were prepared using a one-step in situ hydrothermal synthesis method. The modified MCM-41 molecular sieves maintained the mesoporous structure, and the metal ions had specific dispersion on the surface of the molecular sieves. Adsorption of thiophene on the surfaces of molecular sieves had both physical and chemical characteristics. The adsorption desulfurization performance of the modified molecular sieve was superior to that of the pure silica molecular sieve. In the simulated gasoline with sulfur content of 220 μg/g, when the amount of adsorbent used was 100 mg, the adsorptive desulfurization performance tended to be in equilibrium, and the optimum adsorption temperature was 30°C. Fe-MCM-41 and MCM-41 molecular sieves reached adsorption equilibrium after ~60 min, but the desulfurization rate of Co-MCM-41 and Zn-MCM-41 still increased slightly. The kinetic simulation results indicated that the pseudo-second-order kinetics adsorption model described well the adsorption process of thiophene on molecular sieves. The molecular sieve Fe-MCM-41 had the best desulfurization performance with an equilibrium adsorption capacity of 14.02 mg/g and the desulfurization rate was ~90%.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-7
·
IF 5.479
Zhu Xiaolei,Liu Bingchuan,Li Ling,Wu Longsheng,Chen Sijing,Huang Long,Yang Jiakuan,Liang Sha,Xiao Keke,Hu Jingping,Hou Huijie
A delaminated MXene-bismuth (Bi@d-Ti 3 C 2 ) nanocomposite was synthesized for the construction of a microgrid electrochemical sensor via mechanical milling. The Bi@d-Ti 3 C 2 nanocomposite was synthesized by accumulation of Bi(III) on the surface of delaminated Ti 3 C 2 nanosheets through electrostatic attraction and subsequent in-situ growth of bismuth nanorods. Under optimized experimental conditions, the sensor exhibits (a) linear responses to Pb(II), Cd(II) and Zn(II) in the concentration range from 1 to 20 μg L −1 , (b) well separated peak potentials at −0.54 V, −0.76 V and − 1.15 V vs. Ag/AgCl, (c) sensitivities of 0.98, 0.84 and 0.60 μA L μg −1 , and (d) detection limits of 0.2, 0.4 and 0.5 μg L −1 , respectively. This performance is attributed to the uniform dispersion of Bi nanorods on electrically conductive delaminated Ti 3 C 2 MXene, and to the enhanced diffusion due to the microgrid structure.
Schematic representation of a microgrid sensor based on delaminated MXene-bismuth (Bi@d-Ti 3 C 2 ) nanocomposite for the simultaneous electrochemical determination of Pb(II), Cd(II) and Zn(II).
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 29
·7857-7868
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IF 3.286
Luo Danqiu,Chen Huayun,Zhou Pei,Tao Han,Wu Yuangen
A novel colorimetric sensing platform based on the peroxidase activity of hemin regulated by oligonucleotide and pesticide was reported for the ultrasensitive and selective detection of isocarbophos. Oligonucleotides can accumulate on the surface of hemin in acid condition and temporarily inhibit its catalytic activity, which results in the loss of one electron of TMB molecule and produce the blue products. With the addition of isocarbophos, the pesticide molecules can interact with oligonucleotides to form some complexes, which relieve the inhibition of ssDNA to hemin and further enhance its catalytic activity. Thus, the TMB molecules are further oxidized to lose another electron and produce the yellow product in a few minutes, which has the characteristic absorption peak at 450 nm. The color change of the sensing system is related to the amount of isocarbophos, so this method can quickly discriminate whether the target pesticide exceeds the maximal residue limit just by naked eyes. To improve the performance of sensing platform, some important parameters like buffer condition and ssDNA have been investigated, and the peroxidase activity of hemin was further studied to verify the catalytic mechanism. The proposed sensing platform has a detection limit as low as 0.6 μg/L and displays good selectivity against other competitive pesticides. Moreover, the developed sensing platform also exhibits favorable accuracy and stability, indicating that it has potential applications in the detection of pesticide residues in agricultural products.
A novel colorimetric sensing platform based on oligonucleotides and pesticide regulation; the peroxidase catalytic activity of hemin was firstly reported for the ultrasensitive and selective detection of isocarbophos pesticide.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·533-545
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IF 2.064
Zhou Quan,Qian Le,Pan Qianqian,Si Guanqing,Qi Zhaopeng,Zheng Yuchuan,Li Changjiang
In this paper, a novel chemosensor (named L1) for Fe 3+ based on the rhodamine 6G and o -vanillin has been synthesized, which can selectively recognize Fe 3+ . The L1 solution showed a distinguishable colour change by naked eye, and the fluorescence turns on response after the addition of Fe 3+ . In addition, the experimental results showed that the spirocyclic of L1 was opened by cooperation between L1 and Fe 3+ , and then the fluorescence emission after excitation of the mixture solution was detected with the change in solution colour. The complexation coefficient of L1 towards Fe 3+ was 1:1. Furthermore, L1 for Fe 3+ sensing had a remarkable low detection limit of 427 nM (UV) and 130 nM (fluorescence), which is far below the drinking water standards (0.3 mg/L) of China. Meanwhile, the in vivo imaging and cell viability assay experiments demonstrated that L1 could be used for sensing Fe 3+ in vivo.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
Liang Wenting,Rong Yanqin,Fan Lifang,Zhang Caihong,Dong Wenjuan,Li Jing,Niu Jianping,Yang Cheng,Shuang Shaomin,Dong Chuan,Wong Wai-Yeung
Reduced graphene oxide containing Fe 3 O 4 nanoparticles was decorated with hydroxypropyl-β-cyclodextrin (HP-β-CD) to construct a novel nanocomposite (3D-rGO/Fe 3 O 4 /HP-β-CD). The composite was placed on a glassy carbon electrode (GCE) to design an electrochemical sensor for detecting simultaneously serotonin (5-HT), dopamine (DA), and ascorbic acid (AA). The interconnected porous reduced graphene oxide framework tightly anchored to the Fe 3 O 4 magnetic nanoparticles warrants good electrical conductivity and efficient catalytic activity. The HP-β-CD acts as a supramolecular host with high recognition ability for 5-HT, DA and AA. Well-separated oxidation peaks and increased peak currents were observed for 5-HT, DA, and AA individually and in mixtures by differential pulse voltammetry (DPV). The following figures of merit were found for simultaneous electrochemical determination of 5-HT, DA, and AA: (a) Well separated peaks at around 0.316, 0.16 and − 0.044 V; (b) linear responses in the 0.01 – 25 μM, 0.02 – 25 μM and 10 – 350 μM; (c) detection limits of 3.3 nM, 6.7 nM and 3.3 μM (S/ N = 3), and (d) recoveries of 96.9-103%, 97.3%-102% and 96.3-105% from spiked serum samples, respectively. All relative standard deviation (RSD) are less than 4%.
Schematic representation of simultaneous detecting serotonin (5-HT), dopamine (DA) and ascorbic acid (AA) for three-dimensional reduced-graphene oxide/Fe 3 O 4 /hydroxypropyl-β-cyclodextrin (3D-rGO/Fe 3 O 4 /HP-β-CD) by differential pulse voltammetry (DPV) approach.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 12
·1-11
·
IF 2.009
Zhang Farong,Shen Bowei,Jiang Wenxiu,Yuan Hui,Zhou Hong
Extraction of diosgenin from the rhizome of Dioscorea by catalytic hydrolysis over recyclable solid acids is one of the most enviromentally friendly ways for the conversion of biomass into chemicals. In this paper, a magnetic solid acid, Fe 3 O 4 @SiO 2 @NH-(CH 2 ) 2 -NH 2 @SO 3 H with the particle size of about 80 nm, was synthesized by using Fe 3 O 4 (~ 20 nm) as a magnetic core and then coated orderly with tetraethyl orthosilicate (TEOS) and N-{3-(Trimethoxysilyl) propyl} ethylenediamine (TMPED) by sol-gel reactions in water/ethanol solution, followed by the sulfonation of chlorosulfonic acid. The solid acid was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). The content of acidic sites on the surface of the solid acid was 1.01 mmol/g, measured by back titration method. The prepared solid acid was used to hydrolyze and extract diosgenin from Dioscorea nipponica Makino (DNM). The results show that the magnetic solid acid has higher hydrolysis activity than 2.5 M hydrochloric acid under same hydrolysis conditions, at 110 °C for 5 h. In addition, the magnetic solid acid can be easily separated from the reaction mixture by the application of a magnet and reused several times without significant activity loss. This work has a potential application value for the extraction of diosgenin from plants.
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IONICS
·
2019
·Vol. 26
·期 4
·2063-2070
·
IF 2.289
Zhang Teng,Yue Hongyan,Gao Xin,Yao Fei,Chen Hongtao,Lu Xinxin,Wang Yuanbo,Guo Xinrui
A novel hybrid of polyaniline nanowire array/three-dimensional hollow graphene balls - graphene oxide (PANI NWA/3D HGBs-GO) is prepared. 3D HGBs are first fabricated by template-oriented carbon segregation, and then PANI NWAs are grown on their surface by in situ polymerization to obtain PANI NWA/3D HGBs. Finally, the surface of PANI NWA/3D HGBs is modified by hexadecyl trimethyl ammonium Bromide (CTAB), and PANI NWA/3D HGBs and GO are combined by electrostatic self-assembly method to obtain PANI NWA/3D HGBs-GO composite. Due to the unique structure, the hybrid exhibits a high specific capacitance of 690.0 F·g −1 at 1 A·g −1 . When it is assembled into a symmetric supercapacitor, it exhibits an energy density of 30.9 Wh·kg −1 at a power density of 690.1 W·kg −1 and maintains a good cycle stability of 90% after 10,000 cycles at 1.0 A·g −1 .
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Nano Research
·
2019
·Vol. 13
·期 1
·52-60
·
IF 8.515
Yan Fanyong,Jiang Yingxia,Sun Xiaodong,Wei Junfu,Chen Liang,Zhang Yuyang
Multicolor emissive carbon dots (M-CDs) have tremendous potential applications in manifold fields of bioimaging, biomedicine and light-emitting devices. Until now, it is still difficult to produce fluorescence tunable CDs with high quantum yield across the entire visible spectra. In this work, a type of M-CDs with concentration-tunable fluorescence and solvent-affected aggregation states was synthesized by solvothermal treatment of citric acid (CA) and 1-(2-pyridylazo)-2-naphthol (PAN) and the formation mechanism was monitored by different reaction time and raw material ratio. The fluorescence spectra of M-CDs in organic solvents can range from 350 to 750 nm by adjusting the concentration. M-CDs possess different aggregation states in water and organic solvents, accompanied by different fluorescence emission, which is attributed to the different surface states of various component CDs in M-CDs. Moreover, the obtained products can be uniformly dispersed into polymethylmethacrylate (PMMA) solutions as well as epoxy resins to fabricate transparent CDs/PMMA films and CDs/epoxy composites, which can effectively prevent the aggregation and produce multicolor and white light-emitting diodes (WLED). In addition, the prepared WLED with Commission Internationale de L’Eclairage (CIE) of (0.29, 0.31) by using M-CDs/epoxy resin as packages, demonstrating the M-CDs exhibit potential applications for light-emitting devices.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 4
·4520-4527
·
IF 2.914
Guo Feng,Zhu Zihan,Zheng Zhangqin,Jin Ying,Di Xiaoxuan,Xu Zhonghao,Guan Hongwei
Rampant use of tetracycline in animal feed is a threat to food security, the environment, and human health because of the risk of drug residues. Therefore, it is necessary to establish a sensitive, efficient, and reliable method for qualitative and quantitative detection of tetracycline. In this paper, we synthesized fluorescent carbon dots (FCDs) by thermal cracking of crab shell waste, and obtained a fluorescence quantum yield of 30%. Characterization of the FCDs by transmission electron microscopy, Fourier-transform infrared spectroscopy, ultraviolet visible absorption spectroscopy, and photoluminescence spectroscopy showed that they were fluorescent and evenly distributed with an average size of approximately 10 nm. We designed a sensitive probe for detecting tetracycline using the fluorescence intensity change of the FCDs. This method is sensitive, inexpensive, and environmentally friendly. The concentration of tetracycline was examined by comparing the fluorescence intensities of the FCDs before and after tetracycline addition. The limit of detection for tetracycline was 0.005 mg/L (signal-to-noise ratio = 3), which is promising for method development.
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高影响因子
International Journal of Peptide Research and Therapeutics
·
2019
·Vol. 26
·期 4
·1839-1846
·
IF 1.219
Liu Lei,Liu Jie,Cui Qi,Jia Bo-Yan,Pei Zhi-Hua,Odah Kokou Ayefounin,Wang Yi-Ming,Dong Wen-Long,Kong Ling-Cong,Ma Hong-Xia
Proline-rich antimicrobial peptides (PR-AMPs) have attracted much interest as they target Gram-negative and do not act by lytic mechanisms. In this study, a novel hybrid peptide OM19R was designed based on the Oncocin and MDAP-2. OM19R showed specific and improved potency against Escherichia coli ( E. coli ), Salmonella and Shigella standard strains compared to parental peptides. The minimum inhibitory concentrations (MICs) ranged from 1 to 2 μM. However, the activity against Klebsiella pneumoniae ( K. pneumoniae ) was inhibited. The dependence of the SbmA protein for OM19R activity was also studied by a gene-knockout strain. The confocal laser scanning microscopy further revealed that OM19R could rapidly penetrate into E. coli cells without membrane damage. In summary, the hybrid peptide OM19R is a strong cell-selective antibacterial peptide and a promising specific antibacterial agent.
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危险品化学品经营许可证（带存储）