IONICS
·
2018
·Vol. 24
·期 11
·3367-3373
·
IF 2.347
Zhang Rui-Tao,Han Jia-Jun,Liu Pan,Bao Chang-Yuan,Cheng Jin-Ning
Graphene oxide (GO) was synthesized by an improved Hummers method and then reduced with NaBH 4 ; GO became rGO with regular layered structure. Polyaniline (PANI)/rGO composite was prepared by a adsorption double oxidant method with rGO as a template. Some physical characterization methods (Fourier transform infrared spectroscopy analysis, X-ray diffraction, scanning electron microscope, and transmission electron microscope) were used to analyze the morphology and crystallinity of the composite. The electrochemical properties were characterized by cyclic voltammetry, impedance spectroscopy, galvanostatic charge/discharge, and rate capability. The first discharge specific capacity of the rPANI/rGO and PANI/rGO was 181.2 and 147.8 mAh/g. After 100 cycles, the capacity retention rate was still 90.2 and 88.9% separately, and the coulombic efficiency of batteries is close to 100%. These results demonstrate the composite has exciting potentials for the cathode material of lithium-ion battery.
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CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 5
·799-807
·
IF 1.401
Wang F. Q.,Li J.,Wu J.-F.,Zhao G.-C.
Abstract In this study, magnesium/aluminum-layered double hydroxide (Mg/Al-LDH) was prepared with the hydrothermal method and the morphological features of Mg/Al-LDH were characterized. The as-prepared Mg/Al-LDH was employed as a coating material and coated on the stainless steel wire to construct a solid-phase microextraction fiber. To evaluate the extraction performance of the fiber, four phthalate esters including benzyl butyl phthalate, di- n -butyl phthalate, di- n -octyl phthalate and bis (2-ethylhexyl) phthalate were selected as model compounds. Several experimental parameters affecting the extraction efficiency, such as extraction temperature, extraction time and ionic strength, were optimized. Under the optimum conditions, linear ranges of 1–400 μg L −1 for di- n -butyl phthalate, 10–500 μg L −1 for di- n -octyl phthalate and 10–400 μg L −1 for two other compounds were observed. The limits of detection and limits of quantification ranged from 0.24 to 2.31 μg L −1 and 0.81 to 7.69 μg L −1 , respectively. The intra-day and inter-day precision are less than 15.3 and 8.7%. The relative standard deviation of fiber to fiber reproducibility ranged from 8.3 to 16.7%. Finally, the established method was satisfactorily applied to the determination of phthalate esters in the Yangtze River water samples and the recoveries were 76.1–110.6%. Graphical Abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 35
·期 5
·1119-1127
·
IF 2.199
Li Yuan,Liu Xiaodong,Cai Weijie,Cao Yafeng,Sun Yanfeng,Tan Fengzhi
This work mainly focused on the preparation of a low-cost, ultralight absorbent from renewable corn straw and filter paper via a facile and environmental-friendly approach containing high-shear blending and freeze-drying operation. The physicochemical properties of aerogel were thoroughly examined by several characterization techniques. The satisfactory hydrophobicity of the spongy aerogel was attributed to the formation of polysiloxane on the surface of methyltrimethoxysilane (MTMS) by the silanization reaction. Owing to its superior features, such as ultralow density, high porosity, desirable hydrophobicity, the corn straw based spongy aerogel exhibited a remarkable absorption capacity for both crude oil (36 g/g) and common organic solvents including carbon tetrachloride (CCl 4 , 45 g/g), dimethyl sulphoxide (DMSO, 24 g/g), N, N-dumethylformamide (DMF, 45 g/g). This might shed light on the design of efficient adsorbent for oil spills and organic pollutants to meet with the sustainable development.
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INFLAMMOPHARMACOLOGY
·
2018
·Vol. 27
·期 5
·969-974
·
IF 3.304
Zhao Mingyi,Zhou Peng,Yu Jun,James Asenso,Xiao Feng,Wang Chun,Wei Wei
Paeoniflorin-6′-O-benzene sulfonate (code: CP-25) is a novel ester derivative of paeoniflorin (Pae). Compared to Pae, CP-25 has higher lipid solubility, bioavailability and better bioactivity. However, the tissue distribution and excretion of CP-25 still remain unknown. The LC–MS method was applied to investigate the tissue distribution and excretion of CP-25 in rats. As such, 50 mg/kg of CP-25 and Pae were administered to rats in multiple doses via an oral route. CP-25 and Pae were distributed widely and rapidly in all the tested tissues. Compared with Pae, the concentrations of CP-25 were almost increased evidently in most tissues. The highest CP-25 level was found in the liver (1476.33 ± 535.20 ng/g, male; 1970.38 ± 177.21 ng/g, female) at 3 h, and a high concentration of CP-25 was detected in male and female intestine, synovium, muscle, lung, and brain. Following a single oral dose of 50 mg/kg of CP-25 in rats, the total excretion of CP-25 was merely 21.8% (18.40, 3.19 and 0.22% for feces, bile and urine, respectively) in males; and was approximately 21.3% (14.04, 7.16 and 0.14% for feces, bile and urine, respectively) in females. The results indicated that the CP-25 concentration was higher in major tissues than Pae; CP-25 was primarily excreted through the feces; and there were gender-related differences in the tissue distribution and excretion.
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PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 12
·2961-2970
·
IF 3.307
Chen Xuejiao,Gong Fuchun,Cao Zhong,Zou Wu,Gu Tingting
Strongly green fluorescent carbon dots (CQDs) have been directly synthesized from 2,4-diaminophenylhydrazine and 2-hydroxy-5-methylisophthalaldehyde through a facile solvothermal method. The novel CQDs exhibit high fluorescence quantum yield and excellent water solubility due to the abundant amino and hydroxy groups on their surface. The use of the as-prepared CQDs combined with Cu 2+ constructed a “turn-on” switch cysteine-responsive nanoprobe. In the CQDs-Cu 2+ assemblies, the binding of Cu 2+ to CQDs results in the fluorescence quenching of CQDs by electron transfer mechanism, while the addition of cysteine leads to the fluorescence recovery because of the competitive binding between cysteine and CQDs to Cu 2+ . The nanoprobes showed high sensitivity to cysteine with the detection limit of 2.6 nmol L −1 . The selectivity investigation results demonstrated that the Cu 2+ -integrated nanoparticles were highly selective toward cysteine over the other amino acids and biologically related metal ions. The proposed nanoprobe was then employed for detecting the recovery of cysteine in rabbit serum and plasma samples and imaging the cysteine in cancer cells, and the recovery was found to be 98.2–104.0%. This “synthesis-modification integration” strategy for the fabrication of CQDs may offer a new sight for the preparation of multifunctional nanostructures and broadening the application of CQDs in bioimaging.
Fluorescent carbon dots (CQDs) were directly synthesized from 2,4-diaminophenylhydrazine and 2-hydroxy-5-methylisophthalaldehyde. CQDs exhibit high fluorescence quantum yield and excellent water solubility due to the abundant amino and hydroxy groups on their surface. The use of CQDs combined with Cu 2+ constructed a cysteine-responsive nanoprobe, which showed high sensitivity to cysteine with the detection limit of 2.6 nM.
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Cell Death & Disease
·
2018
·Vol. 9
·期 3
·1-15
·
IF 5.638
Ding Yue,Liang Xiaoting,Zhang Yuelin,Yi Li,Shum Ho Cheung,Chen Qiulan,Chan Barbara P.,Fan Huimin,Liu Zhongmin,Tergaonkar Vinay,Qi Zhongquan,Tse Hung-fat,Lian Qizhou
Immunomodulatory activity of mesenchymal stem cells (MSCs) is largely mediated by paracrine factors. Our previous studies showed that activation of nuclear factor-kappa B (NF-κB) regulates cytokine/growth factor secretion by MSCs. This study aimed to elucidate the role of Rap1 (repressor/activator protein), a novel modulator involved in the NF-κB pathway, in regulating the immunomodulatory potency of MSCs in acute allograft rejection of heart transplantation. The immunosuppressive potency of wild-type MSCs (WT-MSCs) or Rap1-deficient MSCs (Rap1 −/− -MSCs) was examined in mice with acute allograft rejection following heart transplantation. With a combination of immunosuppressant rapamycin at a dose of 1 mg/kg/d, WT-MSCs notably prolonged the survival of the transplanted heart compared with Rap1 −/− -MSCs. Rap1 −/− -MSCs displayed a marked insensitivity to inhibit the mixed lymphocyte reaction (MLR) due to impaired cytokine production and a significantly reduced activity of NF-κB signaling in vitro . Finally, transplantation of encapsulated WT-MSCs greatly prolonged the survival of the heart allograft compared with encapsulated Rap1 −/− -MSCs. Our results indicate that Rap1 is essential to maintain the immunomodulatory function of MSCs. Deletion of Rap1 results in impaired immunomodulatory function of MSCs.
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PubMed
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 132
·期 3
·1617-1628
·
IF 2.209
Chen Xi,Wang Jun,Huo Siqi,Yang Shuang,Zhang Bin,Cai Haopeng
A phosphorus-containing maleimide flame retardant (BDMP) was synthesized via the addition reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide and N , N ′-bismaleimide-4,4′-diphenylmethane. The structure of BDMP was characterized by Fourier-transform infrared spectroscopy (FTIR), 1 H and 31 P nuclear magnetic resonance and elemental analysis. The thermal, flame-retardant and mechanical properties of the flame-retardant cyanate ester system were investigated by thermogravimetric analysis (TG), limiting oxygen index (LOI), vertical burning (UL-94), cone calorimeter test and dynamic mechanical analysis. The TG results indicated that the initial decomposition of modified CE resin shifted from 416 to 363 °C, and on the contrary, the char yield increased from 38.8 to 44.5%. The results of combustion tests indicated that the CE with highest phosphorus content acquired LOI value of 37% and achieved a UL-94 V-0 rating. The peak heat release rate, average heat release rate and average of effective heat combustion (av-EHC) of that group decreased by 39.5, 31.2 and 41.8%, respectively. In addition, the increase in phosphorus content led to a decrease in av-EHC and average CO 2 yield, and an increase in average CO yield, indicating that BDMP led to an incomplete combustion of the modified CE system. The flame-retardant mechanism was investigated by TG–FTIR, scanning electron microscope and cone calorimeter. Last but not least, the dielectric constant of modified CE system showed a slight fluctuation from 2.96 to 3.02 at 1 GHz, which was lower than that of neat CE.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8338-8346
·
IF 2.324
Song Kai,Ma Zizai,Yang Weiyou,Hou Huilin,Gao Fengmei
In the present work, we reported the fabrication of Fe-doped WO 3 nanofibers via a versatile electrospinning method towards efficient photoelectrochemical (PEC) water splitting. The resultant Fe-WO 3 nanofibers had a high purity in morphology, and the Fe doping levels within the WO 3 nanofibers were controlled in the range from 0.32 to 1.47 at.%, making the band gaps of WO 3 nanofibers tailored from 2.92 to 2.8 eV. The incorporated Fe dopants could not only increase the light absorption, but also improve the charge transport and charge transfer efficiencies, bringing an enhanced PEC activity of the WO 3 nanofiber photoanodes. The WO 3 nanofibers with the optimized 0.32 at.% Fe doping level exhibit the best PEC performance. The mechanism for the enhanced PEC behaviors was proposed.
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Science China-Chemistry
·
2018
·Vol. 61
·期 5
·569-575
·
IF 4.448
Xiao Jiangang,Hu Yu,Du Jianzhong
It is an important challenge to make disk-like polymeric nanostructures. Herein we report a facile method for preparing polymer nanodisks by self-collapse of nanocapsules self-assembled from a statistical copolymer after partial hydrolysis. We find that partial hydrolysis of the statistical copolymer is crucial for the formation of nanodisks as it affords a suitable rigidity for the membrane of nanocapsules. The nanodisk structure has been confirmed by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies with a thickness of 6.3±0.2 nm. Overall, our results demonstrated a new method for making disk-like nano-objects.
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CHEMICAL PAPERS
·
2018
·Vol. 72
·期 9
·2327-2337
·
IF 0.963
Xu Jing,Zhao Lele,Hou Wenlong,Guo Huiyun,Zhang Haiquan
The photocatalytic activity of thin film mainly depended on the morphology of thin film and lifetime of photo-generated charges. Here, we reported the effect of morphology adjusted through solvent vapor treatment (SVT) and different substrates on the photocatalytic activity of iron phthalocyanine (FePc) thin films. The FePc thin films on indium tin oxide (ITO) glass, copper (Cu), and quartz glass were prepared by vacuum evaporation, and their morphologies untreated and treated with solvent vapor such as benzene, petroleum ether, N,N -dimethylformamide for different time intervals; time intervals (0, 24, 36, 48, 72 h) were characterized by ultraviolet–visible spectroscopy, field-emission scanning electron microscopy, and X-ray diffractometer. The effects of thickness and substrate on photocatalytic activity of the FePc thin film were characterized accordingly. SVT could effectively adjust morphology (nanorods and nanosheets) of the FePc thin film and improve its photocatalytic activity for Rhodamine B (RhB) degradation under visible light irradiation. In addition, the thickness (10, 20, and 50 nm) and substrate (ITO, Cu, Quartz glass) of the FePc thin film also affected its photocatalytic activity. The degradation rate of RhB with the optimized FePc thin film on ITO substrate was reached 70.0%. We proposed that the morphology treated by SVT could increase the active sites of the FePc thin film and further improve its photocatalytic activity. The thickness and substrate of the FePc thin film were also discussed.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 9
·5091-5105
·
IF 1.674
Shi Xiang,Shi Hongxin,Wu Hongke,Shen HaiMin
A series of novel fluoroether-containing monomers has been designed and prepared based on the commercially available perfluoroalkyl ether acid fluoride. Treating acid fluoride with allyl alcohol, 2-hydroxyethyl methacrylate or N -allylmethylamine allowed for the direct formation of corresponding vinyl-containing fluorinated monomers. High yields of the fluorinated epoxy monomers could be obtained from acid chloride with glycidol; meanwhile, fluorinated diol was prepared from diethanolamine or 3-amino-1,2-propanediol. Moreover, fluorinated monoamine, fluorinated monoalcohol and fluorinated dichloride were also obtained. Most of these fluorinated monomers were liquid at room temperature and exhibited good solubility in common organic solvents.
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Journal of Applied Spectroscopy
·
2018
·Vol. 85
·期 1
·160-165
·
IF 0.611
Neng Jing,Wang Xujun,Jia Kan,Sun Peilong
Fe 3 O 4 nanoparticles were first modified with tetraethoxylsilane to form Fe 3 O 4 /SiO 2 nanoparticles, followed by the addition of 3-aminopropyltriethoxysilane and 3-thiolpropyltriethoxysilane to introduce –NH 2 and –SH groups to the surface of Fe 3 O 4 /SiO 2 nanoparticles. Gold nanoparticles were further assembled on the surface of Fe 3 O 4 /SiO 2 via the electrostatic adsorption of –NH 2 and the Au–S bond to produce stable core–shell Fe 3 O 4 /SiO 2 /Au gold/magnetic nanoparticles. These Fe 3 O 4 /SiO 2 /Au gold/magnetic nanoparticles were characterized by a variety of techniques such as transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX), and afterwards conjugated with tetrodotoxin antibodies (Ab) and used as a Raman active substrate (Fe 3 O 4 /SiO 2 /Au–Ab) with Rhodamine B (RhB)-labeled tetrodotoxin antibody as a Raman reporter (Ab–RhB). Upon mixing these reagents with tetrodotoxin (TTX), a sandwich complex [Fe 3 O 4 /SiO 2 /Au–Ab···TTX···Ab–RhB] was generated due to the specific antibody–antigen interactions. The immunocomplex was subsequently separated by an externally applied magnetic source and concentrated into a pellet point, where the laser interrogation of the pellet produced a strong signal characteristic of RhB. The logarithmic intensity of the signal was found to be proportional to the concentration of TTX with a limit of detection of 0.01 μg/mL and a detection linearity range of ~ 0.01–0.5 μg/mL. The established method eliminates the complicated procedures of traditional centrifuging, column separation, and incubation and achieves a rapid detection of tetrodotoxin with improved detection sensitivity.
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