JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2016
·Vol. 124
·期 2
·807-814
·
IF 1.781
Liu Lei,Zhang Hongkai,Sun Lei,Kong Qinghong,Zhang Junhao
Montmorillonite possesses nanometer size effect and layer blocking effect, and iron compounds have significant catalytic carbonization performance. Based on these above, the new montmorillonite intercalation iron compounds (MIICs) are designed and synthesized. The MIIC is a typical lamellar compound that holds the homogeneity crystal structure and the adjustable component. The MIIC was modified by cetyltrimethylammonium bromide and obtained organic MIIC (OMIIC). Polypropylene (PP)/aluminum hydroxide (ATH)/OMIIC nanocomposites were prepared via melting intercalation. The structures of PP/ATH/OMIIC nanocomposites were studied by XRD and transmission electron microscope, which indicate that OMIIC disperses well in PP composites, and PP/ATH/OMIIC nanocomposites have the exfoliated and intercalated structures. The combustion tests show that the small amount of OMIIC in PP/ATH composites can apparently favor UL94 test and suppress dripping phenomenon. The cone calorimeter tests indicate that the heat release rate is significantly reduced by the formation of nanocomposites, and the THR of the PP/ATH/OMIIC nanocomposites was decreased in comparison with that of the PP/ATH nanocomposites, which should be attributed to the formation of compact protective char layer.
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Nano Research
·
2016
·Vol. 9
·期 3
·857-865
·
IF 8.893
Zhou Liyan,Yan Shancheng,Pan Lijia,Wang Xinran,Wang Yuqiao,Shi Yi
Two-dimensional transition-metal dichalcogenides (WS 2 and SnS 2 ) have recently joined the family of energy storage materials (for lithium-ion batteries and supercapacitors) as a result of their favorable ion intercalation. So far, challenges in the synthesis of phase-pure WS 2 , restacking between WS 2 nanosheets, low electronic conductivity, and the brittle nature of WS 2 , severely limit its use Li-ion battery application. Herein, we develop a facile low temperature solution sulfuration process to improve battery performance dramatically. The sulfuration process is demonstrated to be effective in converting WO 3 impurities to WS 2 , and in repairing the sulfur vacancies, to improve cyclability and rate capability. Lithium-ion battery measurements demonstrate that the stable capacity of the WS 2 anode could be enhanced by 48.4% via sulfuration reprocessing, i.e., from 381.7 to 566.8 mAh/g at a relatively high current density of 0.8 A/g after 50 cycles. We further show that the sulfuration process can be readily extended to other dichalcogenides, and may provide a class of versatile electrode materials for lithium-ion batteries with improved electrochemical characteristics.
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MOLECULAR NEUROBIOLOGY
·
2016
·Vol. 54
·期 1
·392-405
·
IF 5.397
Chen Ying,Huang Liyong,Zhang Huiyong,Diao Xiling,Zhao Shuyang,Zhou Wenke
Mitochondrial dysfunction and subsequent autophagy, which are common features in central nervous system (CNS) disorders, were found to contribute to neuronal cell injury after subarachnoid hemorrhage (SAH). (-)-Epigallocatechin-3-gallate (EGCG), the main biological active of tea catechin, is well known for its beneficial effects in the treatment of CNS diseases. Here, the ability of EGCG to rescue cellular injury and mitochondrial function following the improvement of autophagic flux after SAH was investigated. As expected, EGCG-protected mitochondrial function depended on the inhibition of cytosolic Ca 2+ concentration ([Ca 2+ ] i ) influx via voltage-gated calcium channels (VGCCs) and, consequently, mitochondrial Ca 2+ concentration ([Ca 2+ ] m ) overload via mitochondrial Ca 2+ uniporter (MCU). The attenuated [Ca 2+ ] i and [Ca 2+ ] m levels observed in the EGCG-treated group likely lessened oxyhemoglobin (OxyHb)-induced mitochondrial dysfunction, including mitochondrial membrane potential depolarization, mitochondrial membrane permeability transition pore (mPTP) opening, reactive oxygen species (ROS), and cytochrosome c (cyt c) releasing. Subsequently, EGCG can restore the disrupted autophagy flux after SAH both at the initiation and formation stages by regulating Atg5 , LC3B , and Becn-1 ( Beclin-1 ) mRNA expressions. Thus, precondition EGCG resulted in autophagosomes and more autolysosomes compared with SAH group. As a result, EGCG pre-treatment increased the neurological score and decreased cell death. This study suggested that the mitochondrial dysfunction and abnormal autophagy flux synergistically contribute to SAH pathogenesis. Thus, EGCG can be regarded as a new pharmacological agent that targets both mitochondria and altered autophagy in SAH therapy.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2015
·Vol. 27
·期 2
·1-12
·
IF 2.587
Jiang Xin,Xiang Tao,Xie Yi,Wang Rui,Zhao Weifeng,Sun Shudong,Zhao Chang-Sheng
Abstract In this study, polyethersulfone/poly (glycidyl methacrylate) particles are prepared via in situ cross-linked polymerization coupled with a phase inversion technique. The surfaces of these particles are then further modified by grafting amino groups using tetraethylenepentamine, dethylenetriamine, ethylenediamine, or 1,6-hexanediamine for the removal of bilirubin. The particles are characterized by Flourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Batch adsorption experiments are performed to verify the adsorption capability, and the effect of bilirubin initial concentration, bovine serum albumin concentration, and solution ionic strength on the adsorption is also investigated. In addition, both adsorption kinetic and isotherm models are applied to analyze the adsorption process of bilirubin, and a particle column is used to further study the bilirubin removal ability.To prove that the method was a universal portal to prepare functional particles, polysulfone, polystyrene, and poly(vinylidene fluoride) based functional particles were also prepared and used for the removal of bilirubin. This study and the results indicated that the particles had a great potential to be used in hemoperfusion treatment for hyperbilirubinemia. Graphical Abstract
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高影响因子
Waste and Biomass Valorization
·
2017
·Vol. 9
·期 4
·657-668
·
IF 1.337
He Rong,Huang Xiaolin,Zhao Peng,Han Bin,Wu Tinghua,Wu Ying
Phosphotungstic acidified titanium–zirconium dioxide catalysts with different loading of phosphotungstic acid (HPA) were synthesized by a precipitation-impregnation method. The phosphotungstic acidified solid acids were characterized by fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), ammonia temperature programmed desorption (NH 3 -TPD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM) techniques. And the catalytic performance of HPA/TiO 2 –ZrO 2 was explored for glucose degradation to 5-hydroxymethylfurfural (5-HMF) in biphasic system, such as the loading of HPA, the molar ratio of TiO 2 to ZrO 2 , reaction time, temperature, amount of catalyst, the volume ratio of V
NaCl(aq) / V
THF and magnetic stirring speed. It was found that activity of the catalyst was related to the amount and density of acid site. The optimized yield of 51.3% for 5-HMF and the optimum conversion rate of 95.4% for glucose were achieved by 5% HPA/TiO 2 –ZrO 2 . Meanwhile, recycling performance of the catalyst was investigated. And the catalyst had good thermal stability, the yield of 5-HMF was 41.2% and the conversion rate of glucose remained at 85.4% after five cycles.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Du Jianwei,Zhang Peng,Zhao Xiao,Wang Youxiang
Cucurbit[7]uril (CB[7]), a representative member of the host family cucurbit[n]uril, can host-guest interact with many guest molecules such as adamantane, viologen and naphthalene derivatives. This host-guest interaction provides an easy strategy in gene vector assembling. Furthermore, CB[7] can self-assemble on gold nanospheres (AuNSs). Herein, the combination of CB[7] and AuNSs provides both advantages of host-guest interaction and photo-thermal effect of AuNSs. In this study, polyethyleneimine (PEI) and polyethylene glycol (PEG) were separately interacted with CB[7] via host-guest interaction. Then by assembling on AuNSs, PEI and PEG were combined together to condense DNA into polyplexes as well as enhance circulation stability of the polyplexes. These gene vectors were found to have high cellular uptake efficiency and low cytotoxicity. Furthermore, the well distributed AuNSs in the polyplexes could transform light into heat under light exposure because of the photo-thermal effect. This was found to effectively promote the entry of gene into cytoplasm and highly enhanced gene transfection efficiency.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 25
·20567-20576
·
IF 2.741
Yao Lingdan,Wang Lixiao,Cheng Guanghuan,Huang Qian,Hu Baolan,Lu Jingrang,Lou Liping
In a previous study, we found that rice-straw biochar degraded and removed hydrophobic organic contaminants (HOCs) through coupled adsorption-biodegradation. However, few studies have determined whether biochar affects HOC isomer degradation and isomer-selective biodegradation or whether biochar can alter HOC isomer features, resulting in changes to HOC isomer residues in water environments. In this study, the effects of biochar at two dosages (0.001 and 0.01 g) on the biodegradation of ten isomers of a typical xenoestrogen of nonylphenol (NP) were evaluated. The results revealed that there were no effects of biochar on the adsorption of NP isomers. However, biochar addition affected the biodegradation of a specific isomer without altering the features of the NP isomers. The treatment of NP isomers with Pseudoxanthomonas sp . yielded degradation ratios ranging from 60.7 to 100%. At 0.001 g biochar treatment, the degradation of eight NP isomers was enhanced (except for NP 194 and NP 193a+b ) due to their bulky structures. The degradation of the ten NP isomers was inhibited when 0.01 g biochar was added. These findings characterized the effects of biochar on NP isomer contaminants and provided basic information for the application of biochar for the remediation of NP isomer contaminants.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2017
·Vol. 243
·期 12
·2265-2273
·
IF 1.664
Wang Xiaobin,Huang Wenqian,Zhao Chunjiang,Wang Qingyan,Liu Chen,Yang Guiyan
Raman hyperspectral imaging technology not only can acquire the image information of the sample; it also contains the Raman spectra information about each pixel. Due to the abundant information that the method provides, it has been applied to detect food safety. This study adopted line-scan Raman hyperspectral technology to quantify benzoyl peroxide (BPO) additive in flour. By analyzing the Raman spectra of BPO and flour, the 999 cm −1 Raman peak was selected for the detection and identification of BPO in flour. Savitzky–Golay filter and adaptive iteratively reweighted penalized least squares (airPLS) methods were used to de-noise and fluorescence correction of the original Raman signals. Binary image was established by 999 cm −1 single-band correction image and threshold segmentation, and this method was used to detect 11 mixture samples with different BPO additive concentrations. The results show that the BPO additives in the mixture samples can be detected, and the detected BPO pixels had a good linear relationship with the concentration of BPO in the mixture samples, correlation coefficient was 0.9902. The above results indicated that the method established in this paper can be applied to non-destructive quantitative detection of BPO additive in flour.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 23
·13522-13532
·
IF 2.599
Fan Lidan,Zhou Yuming,He Man,Tong Yuan,Zhong Xi,Fang Jiasheng,Bu Xiaohai
Boron nitride quantum dots (BNQDs), as promising metal-free quantum dots with unique photoelectric properties, have been controllably fabricated by a facile and high-efficiency microwave irradiation technique in this work. Though a number of attempts have been reported so far, it remains challenging to explore an effective approach to synthesize high-quality BNQDs with uniform size, well dispersion and high quantum yield (QY). Microwave irradiation strategy is identified as an advanced and beneficial method not only for high-efficiency energy inputting but also time-saving in comparison with the reported solvothermal process. Encouragingly, the particle size and QY of BNQDs can be well controlled by adjusting microwave reaction temperature as well as duration time. The average diameter of the as-prepared blue luminescent BNQDs ranges from 1.98 to 7.05 nm with QY up to 23.44%. Furthermore, attributed to the unique nanostructure, quantum confinement effect, and high dielectric loss, the as-prepared BNQDs exhibits an optimal reflection loss of −19.6 dB at 8.9 GHz with a broad effective absorption bandwidth of 5.02 GHz in the frequency range of 2–18 GHz, demonstrating as potential microwave absorption material in electromagnetic interference field.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 8
·1-9
·
IF 1.455
Feng Cong,Yu Zhichao,Liu Hongjing,Yuan Kangkang,Wang Xinqiang,Zhu Luyi,Zhang Guanghui,Xu Dong
The drawback of using TiO 2 in photocatalytic applications lies in the wide band gap and high recombination rate of charge carriers. To solve the above problems, modification of TiO 2 with Au nanoparticles (NPs) has received considerable attention. Here, TiO 2 nanofibers uniformly deposited with Au NPs which have a narrow size distribution (16 nm) were synthesized. We demonstrate that the photocatalytic performance of Au/TiO 2 heterostructured nanofibers can be effectively enhanced under UV and visible light irradiation by manipulating the dosage of decorated Au NPs. The effect of metal dosage on the photocatalytic performance has been systematically investigated. The enhanced photocatalytic properties are ascribed to the increase of visible light absorption from the Au NP’s surface and the enhancement of separation of electron–hole charge pairs at the interface of Au/TiO 2 junctions. Besides, the decrease of photoactivity with more addition of Au NPs is due to the fact that redundant Au NPs reduce the photon flux reaching the TiO 2 surface and also act as recombination centers for electron–hole pairs. The present work provides guidance toward the fabrication of more efficient Au/TiO 2 photocatalysts.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 34
·期 8
·2331-2341
·
IF 2.007
Meng Yue,Xia Shengjie,Pan Guoxiang,Xue Jilong,Jiang Junhui,Ni Zheming
Copper(II) Schiff-base Complexes (Salen-Cu(II)) intercalated zinc-chromium layered double hydroxides (ZnSBCuCr-LDHs) were successfully prepared via coprecipitation. Then, a novel photocatalytic material Zn-Cu-Cr composite oxides (ZnSBCuCr-MO) was prepared after calcination at 500 °C with ZnSBCuCr-LDHs as precursor. The structure and properties of the materials were thoroughly characterized by powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the materials were investigated by photodegradation of a cationic dye Rhodamin B (RhB), which was hard to adsorb by LDHs. The effects of the photocatalyst dosage, the initial pH and temperature of RhB solution on the photocatalytic efficiency were discussed. The results showed that ZnSBCuCr-MO displayed higher photocatalytic activity for RhB than calcined ZnCr-LDHs (ZnCr-MO) and calcined ZnCuCr-LDHs (ZnCuCr-MO). Meanwhile, ZnSBCuCr-MO exhibited better stability and reusability. In addition, the possible photocatalytic mechanism and degradation pathway for RhB were studied through density functional theory (DFT) calculation of the RhB molecule, UV-vis absorption variation and LC-MS analyses of the RhB solution.
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JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 46
·期 7
·4676-4681
·
IF 1.579
Han Wensong
Third-generation hyperbranched polyester (HBPE3) was synthesized by stepwise polymerization with N , N -diethylol-3-amine methylpropionate as AB 2 monomer and pentaerythritol as core molecule. Then, Cu particles were prepared by reduction of copper nitrate with ascorbic acid in aqueous solution using HBPE3 as template. Finally, Cu/SiO 2 particles were prepared by coating silica on the surface of Cu particles. The structure and morphology of the samples were characterized by Fourier-transform infrared (FT-IR) spectrometry, x-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results confirmed the formation of the silica coating on the surface of Cu and that the Cu/SiO 2 particles had spherical shape with particle size in the range of 0.8 μ m to 2 μ m. Compared with pure Cu, the synthesized Cu/SiO 2 core–shell particles exhibited better oxidation resistance at high temperature. Moreover, the oxidation resistance of the Cu/SiO 2 particles increased significantly with increasing tetraethyl orthosilicate (TEOS) concentration.
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