SURFACE & COATINGS TECHNOLOGY
·
2014
·
IF 2.199
Zuxin She,Qing Li,Zhongwei Wang,Cui Tan,Juncen Zhou,Longqin Li
A highly anticorrosion and self-cleaning superhydrophobic surface with hierarchical flowerlike structures fabricated on AZ91D magnesium alloy is reported in this work. The hierarchical micro/nanostructures were created through electrodeposition of Ni–Co alloy coating. Followed by modification of stearic acid, a superhydrophobic surface with a water contact angle as high as 167.3 ± 1.3° and an ultra-low sliding angle of about 1° was achieved. The anticorrosion performance of the superhydrophobic surface was studied by using a combination of potentiodynamic polarization and EIS in neutral 3.5 wt.% NaCl solutions. The superhydrophobic surface can present an excellent anticorrosion effect with the inhibition efficiency of 99.99% to the bare magnesium alloy and its corrosion rate being 0.06% of that of bare magnesium alloy. The resulting superhydrophobic surface showed excellent superhydrophobicity in a wide range of pH values from 1 to 14. Besides, the as-prepared superhydrophobic surface possessed good chemical stability and self-cleaning effect. It's believed that the highly anticorrosion and self-cleaning superhydrophobic surface can efficiently protect magnesium alloy from corrosion and expand its application scope.
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高影响因子
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
·
2013
·Vol. 432
·期 3
·1980-1988
·
IF 5.521
Rodler F.,Kürster M.,Barnes J. R.
With time series spectroscopic observations taken with the Near-Infrared Spectrometer (NIRSPEC) at Keck II, we investigated the atmosphere of the close orbiting transiting extrasolar giant planet, HD 189733b. In particular, we intended to measure the dense absorption line forest around 2.3 μm, which is produced by carbon monoxide (CO). CO is expected to be present in the planetary atmosphere, although no detection of this molecule has been claimed yet. To identify the best-suited data analysis method, we created artificial spectra of planetary atmospheres and analysed them by three approaches found in the literature, the deconvolution method, data modelling via χ2 minimization and cross-correlation. As a result, we found that cross-correlation and χ2 data modelling show systematically a higher sensitivity than the deconvolution method. We analysed the NIRSPEC data with cross-correlation and detect CO absorption in the day-side spectrum of HD 189733b at the known planetary radial velocity semi-amplitude with 3.4σ confidence.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2014
·Vol. 113
·期 1
·281-292
·
IF 0.983
Huang Ji-guo,Zheng Meng-yang,Pang Shuo,Liu Li-guo,Zhao Xiao-guang,Dong Li-li,Liu Xing-juan
N–Si co-doped TiO 2 nanoparticles for the photodegradation of phenol were prepared by SiCl 4 and TiCl 4 co-hydrolysis and the effect of H 2 O 2 modification was studied. The characterization results revealed that the Si doped into the TiO 2 lattice was limited and the redundant silicon existed in segregated amorphous silica. The average crystallite size of the photocatalysts reduced from 14.8 to 5.5 with increasing Si doping ratio. The absorption edges of the as-prepared samples got an obvious red shift in which the best one reached 526 nm. N and Si co-doped into the photocatalysts replaced Ti and formed the Ti–O–Si and O–Ti–N link-ages. The photocatalysts modified by H 2 O 2 were well dispersed and changed the molecular structure. The degradation effect of the used Si doped photocatalysts was better than for undoped photocatalysts, and the H 2 O 2 modification could not further enhance the photocatalytic activity for N–Si doped TiO 2 . For the photodegradation of phenol, the optimal molar ratio of Si/Ti and the calcination temperature was 1:4 and 650 °C, respectively. For the optimal photocatalyst, the molar ratios of O/Ti, N/Ti, and Si/Ti were 0.54, 0.19, 0.29, and the phenol removed 94.4 % in 6 h under solar light. The reusability of N–Si co-doped TiO 2 was relatively good.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 1
·160-166
·
IF 0.875
Zuo Huajiang,Wen Wanhua,Wu Dingcai,Fu Ruowen,Tang Chunyi
Copolymers of quaternary ammonium monomer(QAM) and hydrophilic co-monomer were successfully synthesized by free radical polymerization. It was discovered that the hydrophilic co-monomers with poor antibacterial activity significantly enhanced the activity of QAM substituted with a long alkyl chain[ i.e. , N , N -dimethyl- N -dodecyl methacrylate ammonium bromide(DMAEMA-DB)]. When a suitable molar ratio of DMAEMA-DB to co-monomer was selected, the activity of the copolymers was up to 123 times that of the homopolymer of DMAEMA-DB against S. aureus , and 282 times that of it against E. coli . But unlike DMAEMA-DB, the co-monomers might weaken the activity of QAM substituted with a short alkyl chain[ i.e. , N , N -dimethyl- N -butyl methacrylate ammonium bromide(DMAEMA-BB)]. Moreover, it was found that copolymers of DMAEMA-DB were much more biocidal than those of DMAEMA-BB. Therefore, it could be speculated that the long alkyl chain plays an important role in the antibacterial activity, and that the hydrophilic co-monomers are beneficial to polymeric guaternary ammonium compounds(PQACs) to exert the positive effect of the long alkyl chain to the greatest degree.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 30
·11697-11705
·
IF 0
Akram Alabadi,Xinjia Yang,Zehua Dong,Zhen Li,Bien Tan
Nitrogen-doped activated carbons (N-ACs) with controlled nitrogen doping and analogous microporous structures were prepared by pyrolysis of poly[(pyrrole-2,5-diyl)-co-(benzylidene)] (PPCB). The obtained N-ACs were thoroughly characterized using HRTEM, FESEM, BET, FTIR and XPS for their morphology, surface area and chemical composition. The N-ACs were further used to fabricate supercapacitors, and their comprehensive electrochemical properties, such as cyclic voltammograms, galvanostatic charge–discharge, electrochemical impedance spectrum, electrochemical capacitive performance, power density and long cyclic stability, were studied. The galvanostatic charge–discharge (GC) measurements on N-ACs produced at 700 °C and 800 °C show a high specific capacitance (up to 525.5 F g−1 and an energy density of ca. 262.7 W h kg−1 at 0.26 A g−1) in alkaline media (2 M KOH). More importantly, the capacitance remains practically identical when the scan rate was increased from 0.26 to 26.31 A g−1. The observed capacitance retention (∼99.5%) of N-ACs is remarkably stable for electrodes even after 4000 cycles, due to the presence of nitrogen at the surface and in the graphitic edge planes. The nitrogen content plays a significant role in producing micropore dominated ACs and in facilitating the transfer of ions through pores on the surface. The precursor (PPCB) used is cheap and can easily be prepared, making it promising for the large-scale production of N-ACs as excellent electrode materials for supercapacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 13
·10107-10115
·
IF 2.828
Wang Guanghui,Wang Yin,Hu Suhang,Deng Nansheng,Wu Feng
It is necessary to find an effective soil remediation technology for the simultaneous removal of hydrophobic organic contaminants and heavy metals from contaminated soils. In this work, a novel cysteine-β-cyclodextrin (CCD) was synthesized by the reaction of β-cyclodextrin with cysteine, and the structure of CCD was confirmed by 1 H-NMR, 13 C-NMR, FT-IR spectroscopy and elemental analysis. Pot-culture experiments were conducted to investigate the effects of CCD on the phytoremediation of soil co-contaminated with phenanthrene and lead. The results showed that CCD can enhance the phytoremediation of soil co-contaminated with phenanthrene and lead. When CCD was added to the co-contaminated soil, the concentrations of phenanthrene and Pb in roots and shoots of ryegrass ( Lolium perenne L . ) significantly increased, the presence of CCD is beneficial to the accumulation of phenanthrene and Pb in ryegrass, and the residual concentrations of phenanthrene and Pb in soils significantly decreased. Under the co-contamination of 500 mg Pb kg −1 and 50 mg PHE kg −1 , the bioconcentration factor of phenanthrene and Pb in the presence of CCD was increased by 1.43-fold and 4.47-fold, respectively. After CCD was added to the contaminated soils, the residual concentration of phenanthrene and Pb in unplanted soil was decreased by 18 and 25 %, respectively. However, for the planted soil, the residual concentration of phenanthrene and Pb was decreased by 48 and 56 %, respectively. CCD may improve the bioavailability of phenanthrene and Pb in co-contaminated soil; CCD enhanced phytoremediation technology may be a good alternative for the removal of hydrophobic organic contaminants and heavy metals from contaminated soils.
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 10
·2127-2136
·
IF 4.726
Wei Zhang,Xiaoyan Zhou,Tao Liu,Dong Ma,Wei Xue
The co-delivery of multiple drugs has become the primary strategy in cancer therapy in recent years, because this technique could promote synergistic actions, reduce side effects and deter the development of drug resistance. To achieve a controlled and sustained release of the loaded drugs, a supramolecular hydrogel based on the host–guest interactions between a hyperbranched polyglycerol derivative and α-cyclodextrin was prepared and used to co-load camptothecin and doxorubicin for sustainedly synergistic tumor therapy. The gelation kinetics, hydrogel strength and supramolecular structure of the obtained hydrogel were studied by dynamic and steady rheometry under various concentrations of α-CD. The sustained dual drug release from the supramolecular hydrogel in vitro, and their synergistic effect in vitro and in vivo were also explored. Moreover, the supramolecular hydrogel showed receivable blood compatibility and non-cytotoxicity by in vitro and in vivo assays. Therefore, this supramolecular hydrogel could potentially be applied in sustainedly synergistic tumor therapy.
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PubMed
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2017
·
IF 7.786
Mingxing Yin,Songwei Tan,Yuling Bao,Zhiping Zhang
Conventional tumor starving therapy by reducing its vessel density may be effective at early treatment but potentially contributes to tumor hypoxia , drug resistance and metastasis. A new strategy through enhancing tumor angiogenesis in combination with effective chemotherapeutic drugs, has shown successful tumor growth and spread inhibition. To achieve in situ release of angiogenic and antitumor drugs in tumor, we designed a precise ratiometric polymeric hybrid micelle system for co-delivering nitric oxide and paclitaxel . The hybrid micelles could accumulate in tumor via the long blood circulation and enhanced permeability and retention (EPR) effect, promote the drug accumulation and penetration in tumor by in situ increased vascular permeability, blood perfusion and vessel density, achieve the synergistic antitumor effect of nitric oxide and paclitaxel through modified tumor microenvironment , overcome multidrug resistance and inhibit metastasis. This study presents a combinational therapy against tumor progression and spread, which shows great potential in cancer therapy of the future.
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PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Weihua Xu,Alvianto Wirasaputra,Shumei Liu,Yanchao Yuan,Jianqing Zhao
A highly effective 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based flame retardant (D-bp) was successfully synthesized via the addition reaction between DOPO and Schiff-base obtained in advance by the condensation of 4,4’-diaminodiphenyl methane (DDM) and 4-hydroxybenzaldehyde. D-bp was used as co-curing agent to improve the flame retardancy of DDM/diglycidyl ether of bisphenol A (DGEBA) system. Non-isothermal curing kinetics, thermal and flame-retardant properties of cured epoxy resins were studied by differential scanning calorimeter (DSC), thermogravimeric analysis (TGA), UL94 vertical burning test, limited oxygen index (LOI) and cone calorimeter test. The morphology of residues after cone calorimeter test was observed by scanning electron microscope (SEM). The results revealed that the epoxy thermosets exhibited excellent flame-retardancy and passed V-0 rating of UL 94 test with LOI of 39.7% when the phosphorus content was only 0.5 wt%.
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高影响因子
BIOMEDICINE & PHARMACOTHERAPY
·
2015
·
IF 2.023
Liandong Hu,Saixi Pang,Qiaofeng Hu,Deliang Gu,Dongqian Kong,Xiaoyun Xiong,Jianying Su
Background The current study aimed to investigate whether the novel folate (FT) modified nanoparticles (NPs) co-loaded with docetaxel (DT) and curcumin (CU) (named as FT-NPs) could enhance the delivery efficiency to tumor compared with the NPs without FT (non-targeted NPs). Methods FT-NPs were successfully formulated in this article. In vitro cytotoxic activity against A549 cells and in vivo antitumor activity of FT-NPs in S180 cell bearing mice were conducted. Cellular uptake test was used to evaluate uptake efficiency of FT-NPs. Histological observation was used to determine the lung security. Besides, the physical chemical properties such as stability, particle size, zeta potential , drug encapsulation efficiency, transmission electron microscopy (TEM) were also conducted. Results FT-NPs exhibited stronger growth inhibition effects on A549 cells compared with non-targeted NPs, moreover, the novel FT-NPs indicated more effective antitumor efficacy in inhibiting tumor growth. Confocal laser scanning microscopy indicated that the uptake of FT-NPs was facilitated and effective. Histological observation meant that FT-NPs were biocompatible and appropriate for pulmonary administration. Conclusion These results confirmed that FT-NPs with relatively high drug loading capacity could effectively inhibit tumor growth and reduce toxicity. The novel FT-NPs could produce as an outstanding nanocarrier for the targeted treatment of cancers .
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PubMed
高影响因子
OPTIK
·
2017
·
IF 0.835
Renping Cao,Kailei Bai,Xing Liu,Wudi Wang,Ting Chen,Siling Guo,Zhiyang Luo,Wensheng Li
A series of CaZn 2 P 2 O 8 :Sm 3+ , Mn 2+ phosphors are synthesized by a solid-state reaction method in air. The crystal structures and luminescence properties are investigated. CaZn 2 P 2 O 8 :Sm 3+ phosphor with excitation 402 nm emits red light in the range of 550–750 nm owing to the 4 G 5/2 → ( 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 ) transitions of Sm 3+ ion. CaZn 2 P 2 O 8 :Mn 2+ phosphor with excitation 400 nm emits yellow-green light in the range of 500–650 nm due to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. CaZn 2 P 2 O 8 :Sm 3+ , Mn 2+ phosphor with excitation 400 nm shows a tunable emission in the range of 500–750 nm with changing Sm 3+ or Mn 2+ ion content. The optimal Sm 3+ and Mn 2+ ion concentrations are ∼4 mol% and 3 mol%, respectively.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Hongli Wu,Ting Huang,Fei Cao,Qiaogen Zou,Ping Wei,Pingkai Ouyang
Co-production of multi-products is one of the core principles of chemical industry, and it is also an important way to improve the atom economy. Herein, we proposed an approach to co-producing two valuable platform compounds, gluconic acid (GA) and 5-hydroxymethyl furfural (HMF), from sucrose by successive hydrolysis, oxidation and dehydration. In the enzymatic oxidation step, only glucose was oxidized to GA, meanwhile fructose was 100% retained. In the further biphasic dehydration system, only fructose was converted into HMF, whereas GA was maintained with over 95% recovery. After three reactions, the yields of HMF and GA were respectively 42.5% and 48% when the initial feedstock of sucrose was 200 g/L. Two products were easily separated because GA was completely existed in aqueous phase, and HMF was mainly in organic phase. In the whole process, only commercial enzymes and mineral acid were used instead of self-made catalysts.
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高影响因子
危险品化学品经营许可证（带存储）