CELLULOSE
·
2018
·Vol. 25
·期 10
·6041-6053
·
IF 3.809
Yu Qian,Kong Xianming,Ma Yibo,Wang Rui,Liu Qing,Hinestroza Juan P.,Wang Alan X.,Vuorinen Tapani
Abstract Multi-functional cellulose fiber-Au composites were fabricated through a simple and cost-effective procedure by decorating regenerated cellulose fibers with Au nanoparticles. The cellulose fibers were regenerated from waste paper through the Ioncell-F process, an environmental friendly approach. After grafting positive charge, the surface of the cellulose fibers were decorated with citrate-stabilized plasmonic Au nanoparticles (NPs). X-ray photoelectron spectroscopy, scanning electron microscopy, X-ray diffraction, and optical images were used to characterize the regenerated cellulose fibers and fiber-Au NP composites. The fiber-Au composites exhibited different colors as the localized surface plasmon resonance property of Au NPs, which enables visual sensing of the water content in the fiber-Au composites through a colorimetric method. Furthermore, the regenerated cellulose fiber-Au composite was used as an enhanced substrate for the sensing of malachite green via surface-enhanced Raman scattering, in which the limit of detection was lower than 10 ppb. The multi-functional cellulose fibers are potentially suitable for the detection of toxins and the monitoring of water quality. Graphical abstract
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-9
·
IF 5.705
Wang Zhong-Xia,Gao Yuan-Fei,Yu Xian-He,Kong Fen-Ying,Lv Wei-Xin,Wang Wei
The authors describe the synthesis of fluorescent coral-like carbon nano-branched polymers (PCNBPs) co-doped with nitrogen and phosphorus. Uric acid and phosphoric acid act as nitrogen and phosphorus sources, respectively. The PCNBPs have a coral-like branched structure, are cross-connected, and < 20 nm in skeleton diameter. Their blue fluorescence, best measured at excitation/emission wavelengths of 330/425 nm, is quenched by mercury (II) ions due to the specifically restricted rigid conformation caused by the interaction of phosphorus, nitrogen, and oxygen groups on the surface of the PCNBPs. Fluorescence is selectivity quenched by Hg(II) but restored in addition of the hypertension drug captopril (CAP) in the range 50 nM to 40 μM concentration range. Fluorescence recovery is attributed to the effectively specific interactions between the thiol group of CAP and Hg(II). The method was applied to the determination of the concentration of Cap in pharmaceutical samples, and recoveries were between 97.6 and 105.1%.
Fluorescent coral-like carbon nano-branched polymers (PCNBPs) co-doped with nitrogen and phosphorus are described. Their fluorescence is selectivity quenched by Hg(II) but restored in addition of the hypertension drug captopril (Cap) in the range 50 nM to 40 μM concentration range.
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Chemistry of Heterocyclic Compounds
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2018
·Vol. 54
·期 2
·125-129
·
IF 1.201
Gao Huiqin,Wu Xiangwen
A 3-hydroxyflavone derivative as fluorescence chemosensor for copper and zinc ions has been synthesized. Its recognition properties for copper and zinc ions in aqueous solution were investigated based on UV-vis absorption and fluorescence spectra change. The compound exhibits color change from colorless to yellow and quenching of green fluorescence in the presence of copper ions in aqueous solution due to coordination reaction. In turn, the addition of zinc ions induces the color change from colorless to green and fluorescence enhancement of the compound. The complex ratios between the sensor molecule and copper(zinc) ions are 1:1 and 1:2, respectively, based on the Job's plots and in situ mass spectra. Thus, this compound can selectively recognize copper and zinc ions, and the recognition also can be observed by naked eye.
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Food Analytical Methods
·
2018
·Vol. 11
·期 9
·2553-2560
·
IF 2.245
Zhang Yuanyuan,Li Ming,Cui Yin,Hong Xia,Du Daolin
Tyramine signal amplification (TSA), the excellent signal amplification strategy, has the potential to improve the sensitivities of analytes analysis. In this work, the sensitivity of enzyme-linked immunosorbent assays (ELISA) has significantly improved by coupling TSA system and further biotin-streptavidin (BSA) system. Thus, a sensitive TSA-ELISA based on TSA was developed for detecting aflatoxin B 1 (AFB 1 ) in edible oil samples. Under optimal conditions, the limit of detection (LOD, IC 10 ) and the half-maximal inhibition concentration (IC 50 ) of the TSA-ELISA were 0.004 and 0.039 ng/mL for AFB 1 , respectively. The developed TSA-ELISA for AFB 1 has an 11-fold improved LOD value and 6-fold improved IC 50 value when compared with ELISA. The cross-reactivities of the TSA-ELISA with its analogues were negligible (< 3.48%), which indicated high specificity. The spiked recoveries were 81.4 to 118.8% with relative standard deviations (RSDs) of 3.8 to 9.0% for AFB 1 in edible oil samples. Furthermore, the results of TSA-ELISA correlated well with those obtained by HPLC-fluorescence detector. The proposed TSA-ELISA was a satisfactory tool for sensitive, inexpensive, high-throughput, and alternative detection of AFB 1 in edible oil samples. This study could provide the strategy for improving the sensitivity of ELISA with simple and practical approach, which has significant popularizing value and application prospect.
Comparison of the ELISA and TSA-ELISA for aflatoxin B 1 .
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2018
·Vol. 86
·期 2
·459-467
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IF 1.745
Yao Lili,Sun Yu,Weng Wenjian,Lin Jun,Cheng Kui
In the present study, TiO 2 /ZnO composite nanodot films were prepared and the effects of Zn incorporation on light-induced cell detachment were investigated. The nanodots films, which were successfully synthesized by phase-separation-induced self-assembly method, were characterized on the morphology, composition, microstructure, and other properties, and evaluated on cell compatibility and cell detachment performances as well. Live-dead staining was used to study the viability of cell sheet detached by light illumination. Results shows that with the increasing of introduced Zn, the band gap widened and the absorbance in UV region increased, while the crystallinity and performance of light-induced hydrophilicity weakened. All the nanodots films showed good cell compatibility and cell detachment performance induced by light. The nanodots film which had a Zn/Ti molar ratio of 0.03 showed the highest detachment ratio of 91.0% after 20 min ultraviolet illumination. The prepared TiO 2 /ZnO composite nanodots films could be helpful in optimizing light-induced cell detachment behavior.
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COLLOID AND POLYMER SCIENCE
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2018
·Vol. 296
·期 5
·895-906
·
IF 1.967
Zhang Ming,Chen Mingqing,Ni Zhongbin
We investigated the rheology behaviors of diglycidyl ether of bisphenol-A (epoxy resin) composite pastes with various biscarbamates and compared them with those of epoxy composites with fumed SiO 2 . Thermal and rheological measurements showed thermal reversible rheology behaviors of shear thinning for all epoxy composites with various biscarbamates. Some biscarbamates endowed their epoxy composites’ stronger shear thinning behaviors than fumed silica did even at the low concentrations. Polarized microscopic, FT-IR, and DSC analyses demonstrated that excellent rheological responses of biscarbamates in epoxy composite pastes could be attributed to their various crystallization self-assemblies formed in epoxy matrix by the intermolecular interactions mainly including hydrogen bonding and van der Waals interactions, and these interactions were closely related to the molecular structures of biscarbamates.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 3
·1-15
·
IF 2.127
Feng Jun,Bao Wenyuan,Li Lijun,Cheng Hao,Huang Wenyi,Kong Hongxing,Li Yanqing
We synthesized titanium dioxide (TiO 2 ) and nitrogen-doped TiO 2 nanoparticles (N-TiO 2 NPs) via a sol-hydrothermal method using ammonium chloride (NH 4 Cl) as the nitrogen (N) source. Furthermore, an N-TiO 2 /4-mercaptobenzoic acid (4-MBA)/silver (Ag) nanocomplex served as an active substrate for surface-enhanced Raman scattering (SERS) and was prepared by self-assembly. During SERS, the Raman signals of 4-MBA of the N-TiO 2 /MBA/Ag nanocomplexes exhibited higher intensity and sensitivity than pure TiO 2 /MBA/Ag, with 1% N doping in N-TiO 2 , producing the strongest Raman signals. We characterized the N-TiO 2 hybrid materials by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse reflectance spectra. N doping did not influence the phase of the TiO 2 crystal. The doped N entered into the crystal lattice of the TiO 2 , replacing some oxygen (O) to form Ti-O-N or Ti-N-O linkage. The results indicated that an appropriate amount of N doping could enhance the SERS performance of the TiO 2 SERS substrate via N substitution doping. These doping forms were beneficial to the molecular charge transfer (CT), and this resulted in improved SERS performance for N-doped TiO 2 NPs. We attributed this improvement to the formation of N-doping energy levels that were beneficial to the process of TiO 2 to MBA molecule CT. This work not only enriched the nonmetal-doped CT mechanism in SERS but also provided several reference values for practical applications.
N-doped TiO 2 nanoparticles were synthesized. Whereafter, N-TiO 2 /MBA/Ag nanocomplexes were prepared and served as a SERS-active substrate. An appropriate amount of N doping can enhance the SERS properties of TiO 2 SERS-active substrate by nitrogen substitution doping. The nonmetal doping TiO 2 -to-molecule CT mechanism and the synergistic effect in N-TiO 2 /MBA/Ag charge transfer systems have been studied.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Liu Weixiang,Qin Yukun,Liu Song,Xing Ronge,Yu Huahua,Chen Xiaolin,Li Kecheng,Li Pengcheng
Based on a condensation reaction, a chitosan-derivative-bearing amino pyridine group was prepared and subsequently followed by coordination with cupric ions, zinc ions and nickel ions to synthesize chitosan metal complexes. The calculations using the density functional theory (DFT) show that the copper ions and nickel ions underwent dsp 2 hybridization, the zinc ions underwent sp 3 hybridization, and they all formed a coordination bond with the carbon atom in the p-π conjugate group. The antifungal properties of O-CSPX-M against Phytophthora capsici (P. capsici) , Verticillium alboatrum (V. alboatrum) , Botrytis cinerea (B. cinerea) and Rhizoctonia solani (R. solani) were also assayed. Apparently, chitosan metal complexes showed enhanced antifungal activity against four fungi at the tested concentrations compared to that of chitosan. It was shown that Cu complexes can inhibit the growth of P. capsici 100%, and Ni complexes can inhibit the growth of B. cinerea 77.1% at a concentration of 0.4 mg/mL and 0.2 mg/mL, respectively. The pot experiment also verified the result. In addition, the phytotoxicity experiment showed that O-CSPX-M had no obvious toxicity on wheat leaves. This kind of complexes may represent as an attractive direction for chemical modifications of metal fungicides.
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Nano Research
·
2018
·Vol. 11
·期 4
·1775-1786
·
IF 7.994
Zhao Jingxin,Li Chaowei,Zhang Qichong,Zhang Jun,Wang Xiaona,Sun Juan,Wang Juanjuan,Xie Jixun,Lin Ziyin,Li Zhuo,Lu Weibang,Lu Conghua,Yao Yagang
Fiber-based supercapacitors (FSCs) are new members of the energy storage family. They present excellent flexibility and have promising applications in lightweight, flexible, and wearable devices. One of the existing challenges of FSCs is enhancing their energy density while retaining the flexibility. We developed a facile and cost-effective method to fabricate a highly capacitive positive electrode based on hierarchical ferric-cobalt-nickel ternary oxide nanowire arrays/graphene fibers and a negative electrode based on polyaniline-derived carbon nanorods/graphene fibers. The elegant microstructures and excellent electrochemical performances of both electrodes enabled us to construct a highperformance flexible asymmetric graphene fiber-based supercapacitor device with an operating voltage of 1.4 V, a specific capacitance up to 61.58 mF·cm –2 , and an energy density reaching 16.76 μW·h·cm –2 . Moreover, the optimal device presents an outstanding cycling stability with 87.5% initial capacitance retention after 8,000 cycles, and an excellent flexibility with a capacitance retention of 90.9% after 4,000 cycles of repetitive bending.
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Nano Research
·
2015
·Vol. 8
·期 10
·3237-3249
·
IF 7.01
Liang Ruowen,Jing Fenfen,Shen Lijuan,Qin Na,Wu Ling
Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed noble-metal nanoparticles (Au, Pd, Pt) were immobilized on MIL-100(Fe) (denoted M@MIL-100(Fe)) using a facile room-temperature photodeposition technique. The resulting M@MIL-100(Fe) (M = Au, Pd, and Pt) nanocomposites exhibited enhanced photoactivities toward photocatalytic degradation of methyl orange (MO) and reduction of heavy-metal Cr(VI) ions under visible-light irradiation (λ ≥ 420 nm) compared with blank-MIL-100(Fe). Combining these results with photoelectrochemical analyses revealed that noble-metal deposition can effectively improve the charge-separation efficiency of MIL-100(Fe) under visible-light irradiation. This phenomenon in turn leads to the enhancement of visible-light-driven photoactivity of M@MIL-100(Fe) toward photocatalytic redox reactions. In particular, the Pt@MIL-100(Fe) with an average Pt particle size of 2 nm exhibited remarkably enhanced photoactivities compared with those of M@MIL-100(Fe) (M = Au and Pd), which can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of the photogenerated charge carrier. In addition, possible photocatalytic reaction mechanisms are also proposed.
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Reaction Kinetics Mechanisms and Catalysis
·
2015
·Vol. 116
·期 2
·451-466
·
IF 1.17
Jiang Dahao,Mao Jun,Fang Zheng,Ni Jun,Zhang Qunfeng,Li Xiaonian
In this paper, the deactivation causes of the Pd/SiO 2 catalyst for continuous liquid-phase selective hydrogenation of 6,10,14-trimethylpentadeca-13-en-2-one in 2000 h of pilot plant test were systematically investigated by N 2 adsorption–desorption, thermogravimetric and differential thermal analyses, scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray fluorescence, experiments of CO poisoning and regeneration, and laboratory retests of the deactivated catalyst samples. The pore textures of Pd/SiO 2 catalysts were not destructed during the pilot test, while there were no obvious carbonaceous deposits appearing on the deactivated catalyst samples. The sintering and crystallization of Pd metal nanoparticles were found, which could be partially accountable for the deactivation of Pd/SiO 2 catalysts. Though Pd leaching did not take place in the pilot test, the Pd active phase could be slightly poisoned by sulfur impurities from feedstock hydrogen. Combining the results of CO poisoning and regeneration experiments with those of compositional analyses of fresh and circulating hydrogen in the pilot test, it could be concluded that CO poisoning should be another important reason for the deactivation of the Pd/SiO 2 catalyst due to high concentration of CO in the reaction system of pilot test and relatively low reaction temperature in the middle and at the bottom of the catalyst bed. Fortunately, the CO poisoned Pd/SiO 2 catalyst in the pilot test could be in situ regenerated by installing a purifier for CO elimination from the circulating hydrogen and increasing the temperature of the whole catalyst bed to slightly higher than 383 K.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 407
·期 6
·1721-1734
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IF 3.578
Yang Fan,Bai Quan,Zhao Kailou,Gao Dong,Tian Lei
A novel dual-function mixed-mode stationary phase based on poly(glycidyl methacrylate- co -ethylene dimethacrylate) microspheres was synthesized by thiol–ene click chemistry and characterized by infrared spectroscopy and elemental analysis. The new system displays both hydrophobic interaction chromatography (HIC) character in a high salt concentration mobile phase, and weak cation exchange (WCX) chromatography character in a low salt concentration mobile phase. It can be used to separate proteins in both ion-exchange chromatography (IEC) mode and HIC mode. The resolution and selectivity of the stationary phase were evaluated in both HIC mode and IEC mode using protein standards. In comparison with the conventional WCX and HIC columns, the results were satisfactory and acceptable. Protein mass and bioactivity recoveries of more than 96 % can be achieved in both HIC mode and IEC mode using this column. The results indicate that the novel dual-function mixed-mode column in many cases can replace the use of two individual WCX and HIC columns. In addition, the effects on protein separation of different ligand structures in the dual-function stationary phase and the pH of the mobile phase used were also investigated in detail. The results show that electrostatic interaction of the ligand with proteins must match the hydrophobicity of the ligand, which is an important factor to prepare the dual-function stationary phase. On the basis of this dual-function mixed-mode chromatography column, a new two-dimensional liquid chromatography technology with a single column system was also developed in this study, and was used to renature and purify recombinant human interferon-γ from inclusion bodies. The mass recovery, purity, and specific bioactivity obtained for the purified recombinant human interferon-γ were 87.2 %, 92.4 %, and 2.8 × 10 7 IU/mg, respectively, in IEC mode, and 83.4 %, 95.2 %, and 4.3 × 10 7 IU/mg, respectively, in HIC mode. The results indicate that the dual-function mixed-mode stationary phase prepared in this study may aid in the development of new two-dimensional liquid chromatography technology with a single column for intensive proteomic studies, and it may also find applications in recombinant protein drug production since it can save column costs and simplify the biotechnological processes.
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高影响因子
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