JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 21
·19247-19253
·
IF 2.195
Feng Li,Dong Chengli,Jiang Wenlian,Gu Xiaoling,Xiao Mengjia,Li Chenxi,Ning Zhanglei,Gao Daojiang
Hierarchically uniform three-dimensional europium-based metal–organic frameworks (Eu-MOFs) have been successfully fabricated via a facile and mild liquid precipitation method at room temperature. The morphology, structure, and composition of samples are well characterized by scanning electron microscopy, X-ray powder diffraction, fourier transform infrared spectroscopy, thermogravimetric analysis, and elemental analyses, respectively. These well-arranged Eu-MOFs architectures show red emission corresponding to the 5 D 0 / 7 F 2 transition of the Eu 3+ ions under UV light excitation. Remarkably, these Eu-MOFs samples exhibit clear “turn-off” quenching response for styrene vapors with high selectivity and reusability. This Eu-MOFs fluorescent sensor realizes fast recognition for styrene with a response time of less than 1 min at room temperature. Moreover, good detection reproductivity could also be achieved in this sensor. Considering the easy preparation, high selectivity and excellent repeatability, the sensor system provides a convenient and reliable detection of volatile organic compound in everyday applications.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 2
·1-12
·
IF 1.53
E. Husamelden,Fan Hong
This study was carried out to explore the effects of graphene oxide modified with fluorinated-diol (GOFO) on the properties of the epoxy resin. Fluorinated graphene oxide (GOFO) was prepared by one-step reaction with a fluorinated diol. The fluorinated functionalized graphene oxide was confirmed by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and Thermogravimetric analysis. Epoxy/ fluorinated graphene oxide composites were prepared by dispersing the prepared graphene material in epoxy resin based on Diglycidyl Ether of Bisphenol-A (DGEBA), followed by curing with 4, 4-diaminodiphenylsulfone (DDS). The epoxy composites were examined for its mechanical properties, thermal stability, water uptake, and the water contact angle. Results show that the addition of the proper content of GOFO can enhance the performances of epoxy resin. Epoxy composite tensile and flexural modulus increased by 12.52% and 62.85%, respectively with 0.5 wt.% GOFO loading. Epoxy composite with 0.3 wt.% GOFO shows high thermal stability. The T 5% , T 50%, and T dec were 13 o C, 15 o C, and 13 o C, respectively, higher than pure epoxy. Besides that, the incorporation of 0.3 wt.% GOFO significantly decreases the water uptake from 0.432% for the pure epoxy to 0.304%. In addition, the water contact angle increases from 68.72 o of pure epoxy to 98.65 o for 0.3 wt.% epoxy composite.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 45
·期 5
·2587-2603
·
IF 2.064
Liu Xueting,Zhu Hongcheng,Wu Jingjing,Wang Fang,Wei Fengyu
Abstract Sulfonated polystyrene microspheres have been used as a template to produce a mesoporous polyaniline (M-PANI) spherical shell with open pores, based on which a novel visible-light-active AgI-modified M-PANI@AgI composite was prepared by a chemisorption method. The photocatalytic activity of M-PANI@AgI was significantly enhanced as compared to conventional PANI@AgI, and it increased with the increasing proportion of M-PANI. Superior stability was also observed in the cyclic runs, indicating that the as-prepared composite is highly desirable for the remediation of organic contaminated wastewaters. The improved photocatalytic performance is due to synergistic effects derived from the AgI-modified mesoporous PANI spherical shell with open pores, which can effectively accelerate the charge separation and reinforce the photostability of the composite. In addition, based on active species trapping experiments, a possible mechanism has been proposed. Graphical abstract
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POLYMER BULLETIN
·
2019
·Vol. 76
·期 12
·6413-6428
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IF 1.858
Peng Hui,Lu Min,Lv Fucheng,Niu Mingjun,Wang Wanjie
The effect of silane crosslinking reaction on properties and structure of polypropylene (PP)/ethylene–octene elastomer (POE) blends had been carried out. FTIR and gel content tests confirmed the grafting and crosslinking reaction mechanism of PP/POE blends. The incorporation of POE phase enhanced the crosslinking degree and thermal stability of blends. Crystallinity of silane-crosslinked PP/POE blends decreased sharply, and the melting points change a little with the POE content increasing. The rheological curves of silane-crosslinked PP/POE blends showed an obvious “gel point”, corresponding to the dynamic crosslinking network. Solvent resistance tests suggested crosslinking had a great improvement of solvent resistance. The blends with 30% POE had good comprehensive mechanical properties. Scanning electron microscopy images exhibited that crosslinking had a great influence on the morphologies of silane-crosslinked PP/POE blends. Characterization results indicated the “gel point” acquired from rheology had some corresponding relationship with mechanical properties and solvent resistance.
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ACTA PHARMACOLOGICA SINICA
·
2019
·Vol. 40
·期 8
·1019-1028
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IF 4.01
Yi Quan,Tan Fang-hui,Tan Jia-an,Chen Xiu-hui,Xiao Qing,Liu Ying-hua,Zhang Gui-ping,Luo Jian-dong
Minocycline is a tetracycline antibiotic and has been shown to play a protective role in cerebral and myocardial ischemia/reperfusion (I/R). However, the underlying mechanism remains unclear. Herein, we investigated whether monocyte chemotactic protein-induced protein-1 (MCPIP1), a negative regulator of inflammation, was involved in the minocycline-induced cardioprotection in myocardial I/R in vivo and in vitro models. Myocardial ischemia was induced in rats by left anterior descending coronary artery occlusion for 1 h and followed by 48 h reperfusion. Minocycline was administered prior to ischemia (45 mg/kg, ip, BID, for 1 d) and over the course of reperfusion (22.5 mg/kg, ip, BID, for 2 d). Cardiac function and infarct sizes were assessed. Administration of minocycline significantly decreased the infarct size, alleviated myocardial cell damage, elevated left ventricle ejection fraction, and left ventricle fractional shortening following I/R injury along with significantly decreased pro-inflammatory cytokine IL-1β and monocyte chemoattractant protein-1 (MCP-1) levels in heart tissue. H9c2 cardiomyocytes were subjected to oxygen glucose deprivation (OGD) followed by reoxygenation (OGD/R). Pretreatment with minocycline (1−50 μmol/L) dose-dependently increased the cell viability and inhibited OGD/R-induced expression of MCP-1 and IL-6. Furthermore, minocycline dose-dependently inhibited nuclear translocation of NF-κB p65 in H9c2 cells subjected to OGD/R. In both the in vivo and in vitro models, minocycline significantly increased MCPIP1 protein expression; knockdown of MCPIP1 with siRNA in H9c2 cells abolished all the protective effects of minocycline against OGD/R-induced injury. Our results demonstrate that minocycline alleviates myocardial I/R injury via upregulating MCPIP1, then subsequently inhibiting NF-κB activation and pro-inflammatory cytokine secretion.
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高影响因子
International Journal of Oral Science
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2019
·Vol. 11
·期 1
·1-12
·
IF 2.75
Jiang Yuanjing,Zhang Shixian,Mao Chuanqing,Lai Yongzhen,Wu Di,Zhao Hu,Liao Caiyu,Chen Weihui
The Hedgehog (Hh) signalling pathway is essential for cellular proliferation and differentiation during embryonic development. Gain and loss of function of Hh signalling are known to result in an array of craniofacial malformations. To determine the critical period for Hh pathway antagonist-induced frontal bone hypoplasia, we examined patterns of dysmorphology caused by Hh signalling inhibition. Pregnant mice received a single oral administration of Hh signalling inhibitor GDC-0449 at 100 mg•kg − 1 or 150 mg•kg − 1 body weight at preselected time points between embryonic days (E)8.5 and 12.5. The optimal teratogenic concentration of GDC-0449 was determined to be 150 mg•kg − 1 . Exposure between E9.5 and E10.5 induced frontal bone dysplasia, micrognathia and limb defects, with administration at E10.5 producing the most pronounced effects. This model showed decreased ossification of the frontal bone with downregulation of Hh signalling. The osteoid thickness of the frontal bone was significantly reduced. The amount of neural crest-derived frontal bone primordium was reduced after GDC-0449 exposure owing to a decreased rate of cell proliferation and increased cell death.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Qi Feng,Liu Ruizhen
Integrating multiple tumor therapy functions into one nanoplatform has been a new tumor therapy strategy in recent years. Herein, a dual-modality therapy agent consisting of molybdenum selenide nanodots (MoSe 2 NDs) and bovine serum albumin (BSA) assembled nanospheres (MoSe 2 @BSA NSs) was successfully synthesized. After conjugation of folic acid (FA) molecules via polyethylene glycol (PEG) “bridges,” the FA-MoSe 2 @BSA NSs were equipped with tumor-targeting function. The BSA and PEG modifications provided the unstable MoSe 2 NDs with excellent physiological stability. Since the end-product FA-MoSe 2 @BSA NSs had strong near-infrared (NIR) and X-ray absorbance properties, they exhibited good photothermal properties with excellent photothermal stability and radio-sensitization ability, hence, were explored as photothermal radiotherapy agents. In vitro and in vivo experiments indicated that the FA-MoSe 2 @BSA NSs possessed highly efficient tumor-targeting effect, great biocompability, and synergistic photothermal radiotherapy effect. This work suggests that such biocompatible FA-MoSe 2 @BSA NSs may be a promising multifunctional dual-modality tumor therapy agent for use in combination tumor therapy.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 5
·3437-3453
·
IF 3.917
Zhang Shengli,Chen Haoyu,Zhang Silue,Kai Chengcheng,Jiang Man,Wang Qun,Zhou Zuowan
Abstract A novel biosorbent PEI-HOCM was successfully prepared by grafting polyethyleneimine (PEI) onto H 2 O 2 -oxidized cellulose membrane (HOCM). The whole systhesis process occurred in aqueous solution and was environmentally friendly without any toxic cross-linkers involved. ATR-FTIR, XPS and titration analysis confirmed that the hydroxyl groups of cellulose were oxidized to carbonyl groups by H 2 O 2 and PEI was successfully introduced to the HOCM. The PEI-HOCM had positively charged surface (+ 20.6 to + 86.6 mV) at the measured pH range 3–9 according to the zeta potential analysis. The adsorption of Cr(VI) on the PEI-HOCM obeyed the pseudo-second-order kinetic model and Langmuir isotherm model. Its maximum equilibrium adsorption capacity was 147.06 mg/g at 25 °C, which was much higher than that of cellulose membrane (CM, 30.61 mg/g). According to the obtained results from the intraparticle diffusion, Body kinetic and diffusion-chemisorption models, film diffusion was the rate-limiting step and chemical adsorption was the main mechanism of Cr(VI) adsorption. The Cr(VI) adsorbed on the PEI-HOCM was completely reduced to Cr(III), suggesting that PEI-HOCM was not only useful for Cr(VI) removal but also good for its detoxification. The competitive uptakes from coexisting components (Na + , Mg 2+ , Ca 2+ , phenol, Cl − and NO 3 − ) were insignificant except H 2 PO 4 − and SO 4 2− which reduced the Cr(VI) uptake with a efficiency loss of 22–41%. Ionic strength had little effect on the adsorption in the range of 0–1000 mg/L NaCl. After five adsorption/desorption cycles, the PEI-HOCM still retained good adsorption capacity. More importantly, it can be separated easily after adsorption, which will greatly benefit the wastewater treatment by simplifying the separation procedure and reducing costs. Graphical abstract
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-9
·
IF 5.479
Ge Kun,Liu Jingmin,Wang Peihua,Fang Guozhen,Zhang Dongdong,Wang Shuo
Near infrared (NIR)-emitting persistent luminescent nanoparticles (PLNPs) have advantages such as long afterglow, high photostability and deep tissue spectral penetration. A NIR-emitting inner filter effect (IFE) probe for arsenic(III) is described here. It is composed of polyethyleneimine-coated PLNPs and gold nanorods (AuNPs) coated with dithiothreitol. The probe can detect arsenic(III) (= arsenite) selectively even in the presence of interfering substances. The PLNPs and AuNPs were prepared by a hydrothermal method combined with high-temperature calcination and seed-mediated growth mechanism, respectively. The PLNPs show excellent NIR luminescence (with excitation/emission peaks at 254/695 nm) and long afterglow (lifetime >1200 s). The use of polyethyleneimine improves water solubility and provides positive surface charges for the PLNPs. On exposure to arsenite ions, the luminescence of the probe at 695 nm is restored. Under the optimum conditions, the method can detect As(III) in the 0.067 to 13.4 μmol·L −1 concentration range with good linear relationship (R 2 = 0.99734), and the detection limit (at S/ N = 3) is 55 nmol·L −1 . The precision of this method was demonstrated by 11 replicate detections of 2 μmol·L −1 As(III), and the relative standard deviations (RSD) is 2.1%. The practicality was evaluated by the analyses of real water samples and recoveries for the water samples spiked with 2, 5 and 10 μmol·L −1 of As(III) were 89.8%–100.1% with RSDs ranging from 3.0–5.7%.
A near infrared-emitting inner filter effect (IFE) inhibition probe is presented. It is based on the combination of polyethyleneimine (PEI)-coated NIR-emitting persistent luminescent nanoparticles (type Zn 1.25 Ga 1.5 Ge 0.25 O 4 : Cr 3+ , ZGGO) (PLNPs-PEI) with dithiothreitol (DTT)-coated gold nanorods (AuNPs) (DTT-AuNPs) to detect arsenite.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 11
·11170-11178
·
IF 2.914
Sun Kaixuan,Sun Yuanyuan,Gao Bin,Xu Hongxia,Wu Jichun
Retention and transport of sulfonamides (SAs) in subsurface can strongly affect groundwater quality. In this work, a range of laboratory batch sorption and column transport experiments were conducted to determine the effect of cation type in mixed Ca-Na systems on the retention and transport of two typical SAs, sulfadimethoxine (SDM) and sulfacetamide (SCA), in saturated limestone porous media. Column experimental data showed divalent cation Ca 2+ played a more important role than monovalent cation Na + in decreasing the transport of only SDM in co-cation systems in the saturated limestone media. Further, in the single-cation (i.e., including either Ca 2+ or Na + ) system, increasing ionic strength (IS) of either NaCl or CaCl 2 had little effect on SCA transport; however, increasing of IS of CaCl 2 promoted the retention of SDM in the saturated limestone porous media. This is mainly due to the cation bridging effect of Ca 2+ on SDM and limestone. Overall, SDM showed much higher retention in the limestone columns than SCA, which can be attributed to the two SAs’ different physicochemical properties. Moreover, limestone showed stronger ability to retain the two SAs than quartz sand. Findings in this study suggest that cation type and the concentration of certain electrolyte (e.g., CaCl 2 ) as well as medium type play an important role in controlling the environmental fate and transport of antibiotics.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2019
·Vol. 34
·期 1
·230-235
·
IF 0.605
Liu Kang,Zhang Xianglin,Zhou Kui,Shi Lei,Chen Zhichao,Li Wenchao,Chen Penghua
The bovine hydroxyapatite (BHA) was applied to prepare biological tissue engineering scaffolds by the method of extrusion freeforming. To achieve this goal, BHA were added to sodium alginate (SA) solution to form a slurry system in appropriate proportion. The resulting mixtures were fabricated to be a kind of controllable and porous scaffolds followed with cross-linking in 5% calcium chloride (CaCl 2 ) solution for 24 h. After that, the scaffolds were sintered in air at 1 000, 1 100, 1 200 and 1 300 °C for 5 h. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies were performed on the scaffolds to analyze its microstructure and constituent. To explore the effect of sintering temperature on scaffolds, the compressive strength, volume shrinkage and water absorptivity of BHA-SA composite scaffolds after sintering were investigated. The research tests indicated the feasibility of applying BHA powder to 3D printing. Besides, the scaffolds sintered in a respectively lower temperature possess much more pores and performed higher water absorptivity, which means better cellular affinity. And scaffolds sintered between 1 100 and 1 200 °C presents higher compressive strength.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-7
·
IF 5.479
Fu Huiping,Chen Jiaming,Chen Lijuan,Zhu Xi,Chen Zhuling,Qiu Bin,Lin Zhenyu,Guo Longhua,Chen Guonan
A surface-enhanced Raman scattering (SERS) substrate with good flexibility and high water absorbing capacity is reported. It consists of a calcium alginate sponge incorporating gold nanoparticles. These are in close contact with the sponge without the need for amino or sulfhydryl modification. The substrate is capable of detecting the dyes crystal violet (CV) and malachite green (MG) in water directly and rapidly by immersing it into the liquid sample. Preconcentration and separation are not required. The dyes absorbed on the sponge can be detected without drying and thus the whole analytical process can be completed within 3 min. The results show that the lowest detectable concentrations are 0.1 and 0.25 μg⋅L −1 for CV and MG, respectively. This is lower than the minimum required performance limits set by the European Commission and the US EPA. Moreover, MG and CV can be simultaneously detected in liquid samples due to their different SERS bands (at 1216 and 1534 cm −1 , respectively). It should be noted that the molecular structures of MG and CV are very similar. Therefore, the method has a large potential for determination of several analytes simultaneously even in complex sample metrics.
Schematic presentation of the fabrication of a sodium alginate sponge loaded with gold nanoparticles. Gold nanoparticles together with gel-like alginate were freeze-dried to form the sponge. The sponge was cross-linked by CaCl 2 solution and then it was freeze-dried again.
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