BMC BIOTECHNOLOGY
·
2019
·Vol. 19
·期 1
·1-11
·
IF 2.303
Zeng Liya,Liu Yongchang,Pan Jun,Liu Xiaowen
Background Norcantharidin (NCTD), a demethylated derivative of cantharidin (defensive toxin of blister beetles), has been reported to exhibit insecticidal activity against various types of agricultural pests. However, NCTD applications are limited by its poor water solubility and high dosage requirement. Nanoemulsions have attracted much attentions due to the transparent or translucence appearance, physical stability, high bioavailability and non-irritant in nature. In general, nanoemulsions with small droplet size can enhance the bioavailability of drugs, whereas this phenomenon is likely system dependent. In present study, NCTD nanoemulsions were developed and optimized to evaluate and improve the insecticidal activity of NCTD against Plutella xylostella (Lepidotera: Plutellidae) by a spontaneous emulsification method.Results Triacetin, Cremophor EL and butanol were selected as the constituents of NCTD nanoemulsions via solubility determination, emulsification efficiency and ternary phase diagram construction. Insecticidal activity of NCTD nanoemulsion was associated with the content of surfactant and cosurfactant: (1) Higher effective toxicity exhibited at Smix (surfactant to cosurfactant mass ratio) = 3:1 that may be associated with the changes in interfacial tension; (2) NCTD nanoemulsion at 3:7 < SOR (surfactant to oil mass ratio) < 6:4 was more effective at lower surfactant level, which was attributed to the relatively slow diffusion rate of NCTD hindering by excess surfactant. Interestingly, nanoemulsions with smaller droplets were not found to be more effective in our study.Conclusion sThe optimized NCTD nanoemulsion (triacetin/Cremophor EL/butanol (60/20/20, w/w)) exhibited effective insecticidal activity (LC50 60.414 mg/l, LC90 185.530 mg/l, 48 h) than the NCTD acetone solution (LC50 175.602 mg/L, LC90 303.050 mg/L, 48 h). Spontaneous emulsifying nanoemulsion employed to formulate this poor water-soluble pesticide is a potential system for agriculture application.
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DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 2
·440-449
·
IF 1.439
Li Hongbin,Shi Wenying,Mei Shuo,Li Jinchao,Du Qiyun,Qin Longwei,Zhang Haixia
Poly( p -phenylene terephthalamide) (PPTA), as the raw polymer material of Aramid fiber-1414, has high modulus and high strength which is commonly used in the reinforced composites. However, the general blending often accompany the microphase incompatibility in polymer matrix. In this study, PPTA molecules were incorporated into poly(vinylidene fluoride) (PVDF) membrane matrix through in situ polycondensation of p -phenylene diamine (PPD) and terephthaloyl chloride (TPC) in PVDF solution and PPTA/PVDF molecular composite membranes were prepared via the subsequent nonsolvent induced phase separation (NIPS) process. The anti-compaction properties of resulted PPTA/PVDF molecular composite membranes were systematically investigated including the variations of bursting pressure and membrane thickness, porosity, pure water flux under different pressures. The results suggested that membrane comprehensive anticompaction properties were improved with the increasing of PPTA content in PVDF membrane matrix. Combining the variation trends of membrane anti-compaction properties with morphologies, the compaction-deformation evolution processes of two membrane pore types (sponge-like and finger-like pores) were proposed at the end.
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高影响因子
Phytopathology Research
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2019
·Vol. 1
·期 1
·1-10
·
IF 0
Fan Fei,Hahn Matthias,Li Guo-Qing,Lin Yang,Luo Chao-Xi
Benzimidazole fungicides (MBCs) have been widely used in agriculture since 1970s, and resistance to this class of fungicides in Botrytis cinerea is reported worldwide. Resistance to MBCs in B. cinerea is related to mutations in the target β-tubulin gene ( TUB2 ). Compared with the mutation at codon 200, the substitutions from glutamic acid to alanine (E198A), valine (E198V), or lysine (E198K) at codon 198 are currently the predominant mutations in MBC resistant populations of B. cinerea . In this study, a loop-mediated isothermal amplification (LAMP) method was established for rapid detection of benzimidazole resistance in B. cinerea. On the basis of the three mutations at TUB2 codon 198, three sets of LAMP primers were designed, and each of these primer sets was able to specifically amplify the DNA containing its corresponding mutation, while no amplification was detected with other mutated or the wild type DNA. After optimization, the sensitivity and specificity tests illustrated that this LAMP assay had good sensitivity and specificity to detect specific resistant genotypes in B. cinerea . Result also showed that the LAMP assay had good reproducibility. Above all, boiled mycelia could be used as templates, which simplified the process and increased the efficiency of the assay. Considering its rapidity, simplicity, and high efficiency, the LAMP assay developed in this study is a promising tool for the diagnosis of benzimidazole resistance in B. cinerea , and will contribute to the monitoring of resistance development to MBCs in the future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6469-6474
·
IF 2.195
Ullah Atta,Liu Hanxing,Pengcheng Zhai,Hao Hua,Iqbal Javed,Cao Minghe,Yao Zhonghua,Ahmad Arbab Safeer,Manan Abdul
Solid-state sintering method was used for the synthesis of Mg 1−x Co x SiO 3 (x = 0–0.25) ceramics. Phase, microstructure and microwave dielectric properties of the ceramics were investigated. With increase in Co 2+ content, the increase was observed in the lattice parameters. The Q u f o value of MgSiO 3 was enhanced from 103,453 to 145,846 GHz with increasing the value of x content from 0 to 0.15. The Co 2+ substitution also led to an obvious decrease in the sintering temperature by ~ 100 °C. Clino-enstatite phase formed for the composition with x = 0 while Proto-enstatite formed as the major along with minor clino-enstatite phase for the compositions with x > 0. Good dielectric properties at microwave frequencies i.e. ε r ~ 8.11, Q u f o ~ 145,846 GHz and τ f ~ − 12 ppm/°C were obtained for the composition with x = 0.15 sintered at 1350 °C for 9 h. This is suggested to be a very favorable dielectric material for millimeterwave applications.
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 149
·期 2
·373-389
·
IF 2.911
He Teng,Qu Yixin,Wang Jidong
The catalytic performance of cesium oxide supported on three types of silica gel A-type (A-silica), B-type (B-silica) and C-type (C-silica) was tested for the aldol condensation of methyl acetate (Ma) and formaldehyde (FA) to methyl acrylate (MA). The catalysts were characterized using TEM, BET, XRD, FTIR, TG, XPS, and CO 2 -TPD and the reaction mechanisms were explored using DFT calculations. To obtain high selectivity of MA, appropriate amount of Cs loading is required since much higher loading of Cs leads to excessive decomposition of Ma and/or MA. On the Cs/silica, the Si–O–Cs species generated from the reaction of cesium oxide with silanol groups are the active sites as demonstrated by characterization and the DFT calculations. Silica gels with larger pore size and pore volume are preferred since these facilitate the contact of the reactants with active sites and provide higher capacity for accommodation of coke. As compared with Cs/SBA-15, Cs/B-silica seems more prospective for industrial application due to the lower cost of silica gel and even better performance. Graphical Abstract
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高影响因子
IONICS
·
2018
·Vol. 25
·期 4
·1607-1615
·
IF 2.347
Lu Yang,He Ke-Wu,Zhang Shu-Jian,Zhou Yu-Xiang,Wang Zhen-Bo
An all-solid-state polymer electrolyte has been prepared by polymerizing a monomer ethoxylated trimethylolpropane triacrylate (ETPTA) using ultraviolet irradiation (UV-curing) into crystal electrolyte (referred to as UV-PCCE) in this paper, which has the merit of outstanding interfacial compatibility with electrode materials. Otherwise, on account of the appearance of a unique plastic-crystalline phase, this polymer electrolyte presents a great electrochemical window (4.78 V vs Li/Li + ) and a high ionic conductivity at ambient temperature. The cell of LiFePO 4 /UV-PCCE/Li displays a high initial discharge capacity of 147.1 mAh g −1 at 0.5 C and 118.0 mAh g −1 at a rate of 8.0 C at room temperature. At the same time, it may deliver a high initial discharge capacity of 150.0 mAh g −1 and the coulombic efficiency approximate 100% over 120 cycles at 2.0 C at 55 °C. Its superior performances demonstrate that the UV-PCCE-based electrolyte via an ultraviolet irradiation is applied to the actual, which can be used for high-performance lithium-ion batteries. This technology can also be compatible with existing lithium-ion battery equipment.
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高影响因子
Friction
·
2019
·Vol. 8
·期 2
·360-369
·
IF 3
Fan Mingjin,Ai Jia,Zhang Shuai,Yang Chenlu,Du Xin,Wen Ping,Ye Xiangyuan,Zhou Feng,Liu Weiming
The depletion of petroleum resources and the intensification of environmental problems have necessitated the development of renewable products from bio-based chemicals instead of petroleum resources. Herein, a new kind of ester lubricating oil, isooctyl furan dicarboxylate (isooctyl-FD), was prepared from bio-based 2, 5-furandicarboxylic acid. The structure of isooctyl-FD was evaluated using nuclear magnetic resonance imaging and high-resolution mass spectroscopy. Its physicochemical and tribological properties including thermal and oxidation stabilities, flash point and pour point, viscosity and viscosity index, and friction-reducing and anti-wear properties were systematically evaluated. The results show that isooctyl-FD has comparable thermal and oxidation stability to the synthetic ester lubricating oil, isooctyl sebacate (isooctyl-S). Its friction-reducing and anti-wear properties are superior to isooctyl-S; however, its viscosity-temperature and low-temperature properties are inferior to isooctyl-S.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 3
·1-11
·
IF 2.009
Qin Ju,Zhang Limei,Yang Rui
In this paper, a novel fluorescence carbon dots (FCDs) were proposed to use folic acid as the sole reactant via the pyrolytic way. The gotten FCDs were uniform in size distribution and had an excitation-independent emission feature, and their fluorescence quantum yield was 39.09%. Without additional modification, the acquired FCDs could be used to detect isoniazid by the fluorescence quenching pattern. The reaction mechanism was the synergy of the internal filtration effect and the static quenching effect. The linear range of the detection of isoniazid was 4.0–140 μM, and the detection limit was 1.15 μM. Therefore, the method for the determination of isoniazid was put forward. The method was applied to the detection of isoniazid in isoniazid tablets with the recovery rates of 98.12 to 102.67%, and the results were satisfactory.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5877-5897
·
IF 2.993
Zhang Jiancheng,Li Liping,Guo Ruilu,Zhou Haorui,Li Zhiming,Chen Guangxin,Zhou Zheng,Li Qifang
Methacryloxypropyl-polyhedral oligomeric silsesquioxane (MAP-POSS) was photopolymerized with the tri- or tetra-functional thiol monomer in different stoichiometry. A novel inorganic–organic methacrylate hybrid material with highly cross-linked network and high performance was synthesized by UV-initiated thiol–ene click chemistry. SEM–EDAX images and XRD diffractograms showed that no agglomeration of MAP-POSS was observed, indicating MAP-POSS dispersed uniformly in the hybrid materials. Real-time FTIR was employed to monitor the conversion of thiol and methacrylate as a function of irradiation time, and the results revealed that highly thiolated monomer could promote the conversion of methacrylate effectively because of stronger chain propagation capability. The TGA indicated that the hybrid materials had high thermal stability of which the onset decomposition temperature rose to 350 °C, approximately 50 °C higher than that of the traditional UV-cured epoxy acrylate/triethylene glycol dimethacrylate (EA/TEGDMA, 70:30 w/w) resin. The highest glass transition temperature ( T g ) of the hybrid materials was 76.2 °C. Compared with traditional EA/TEGDMA resins, the novel hybrid materials consisted of MAP-POSS had fast curing rate, high mechanical properties and thermal stability which made the wider practical applications of UV-cured hybrid materials feasible.
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 149
·期 3
·665-671
·
IF 2.911
Lyu Xinyu,Wang Wencheng,Sun Yiqun,Zhao Qian,Qiu Tao
Abstract An ionic liquid catalyzed Friedel–Crafts alkylation reaction of substituted benzenes with CCl 4 was developed. The reaction proceeded efficiently under mild conditions, gave corresponding trichloromethylarenes with diversity functional groups in moderate to good yields. The influence of Lewis acidity of ionic liquids on the conversion of the alkylation reaction has been investigated. Notably, the probable mechanism of this reaction has been proposed with the assistance of 27 Al NMR spectroscopy. It was noteworthy that the predominance of [Al 2 Cl 7 ] − species in EmimCl–AlCl 3 , N = 0.67 could be detected by 27 Al NMR spectral analysis, and [AlCl 4 ] − was generated at the beginning of reaction. Additionally, it was found that [AlCl 4 ] − could be transformed into [Al 2 Cl 7 ] − when the reaction finished. Some control experiments confirmed that the interaction between Lewis acidic species [Al 2 Cl 7 ] − of the ionic liquid and CCl 4 led to the change in speciation of aluminum during the alkylation reactions. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 3
·1148-1156
·
IF 3.442
Chen He,Yu Lanyong,Lin Zifeng,Zhu Qizhen,Zhang Peng,Qiao Ning,Xu Bin
MXenes are 2D transition metal carbides or nitrides with high electrical conductivity that have attracted great attention as promising electrode materials that supersede carbon-based material designed for supercapacitors. However, the aggregation and self-restacking of MXene 2D nanosheets limit their high-rate performance. In this work, flexible and conductive Ti 3 C 2 T x MXene/carbon nanotubes (CNTs) composite film was prepared through a simple vacuum filtration of the Ti 3 C 2 T x MXene and CNTs suspension mixture. The CNTs integrated MXene nanosheets can effectively prevent the restacking while creating fast ion transport channels for enhanced capacitance. The designed films exhibit excellent performance as supercapacitor electrodes with high capacitance of 300 F g −1 at 1 A g −1 with superior rate performance of 199 F g −1 even at 500 A g −1 , together with excellent cyclic stability of 92% capacitance retention after 10000 cycles at 20 A g −1 . The excellent workability demonstrates potential application of the system for flexible, portable and highly integrated supercapacitors.
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高影响因子
Nano Research
·
2019
·Vol. 12
·期 11
·2766-2773
·
IF 8.515
Fang Dahui,Wan Lei,Jiang Qike,Zhang Hongjie,Tang Xuejun,Qin Xiaoping,Shao Zhigang,Wei Zidong
Bimetallic platinum-copper (Pt-Cu) alloy nanowires have emerged as a novel class of fuel cell electrocatalysts for oxygen reduction reaction (ORR) due to their intrinsic high catalytic activity and durability, but preparing such electrocatalysts with clean surface via facile method is still a challenge. Herein, PtCu alloy with nanowire networks (NWNs) structure is obtained by a simple modified polyol method accompanied with a salt-mediated self-assembly process in a water/ethylene glycol (EG) mixing media. The formation mechanism of PtCu NWNs including the morphological evolution and the relevant experimental parameters has been investigated systematically. We propose that a micro-interface in H2O-EG media formed with the assistance of disodium dihydrogen pyrophosphate (Na 2 H 2 P 2 O 7 ) and its unique nature of coordinating with Pt 2+ or Cu 2+ play critical roles in the formation of NWNs. When tested as ORR catalyst, the PtCu NWNs /C exhibits much higher activity and durability than that of Pt NWNs /C and commercial Pt/C, even exceeding the target of DOE in 2020. The excellent performance of PtCu NWNs /C could be attributed to the unique structure of NWNs with 2.4 nm ultrathin wavy nanowires and plentiful surface defects and the modified electronic effect caused by alloying with Cu atoms.
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高影响因子
危险品化学品经营许可证（带存储）