COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Yunhua Yang,Liang Xiong,Xiaomo Huang,Qingshan Shi,Wei-De Zhang
In this work, we used p-hydroxybenzoic anionic intercalated MgAl-layered double hydroxides (MgAl-(p-BzOH)-LDH) as a filler to modify waterborne polyurethane , and successfully synthesized novel WPU/MgAl-(p-BzOH)-LDH composites. CO 3 2- -type MgAl-LDH was firstly synthesized via hexamethylenetetramine hydrolysis method and then was transferred to p-BzOH-intercalated MgAl-LDH by ion exchange. The nanostructured MgAl-(p-BzOH)-LDH was then grafted by isophorone diisocyanate (IPDI), forming [MgAl-(p-BzOH)-LDH] NCO complex with NCO group on the surface, which promotes its homogeneous dispersion in WPU matrix through chemical bonding. The mechanical properties and water resistance of the composites were improved upon loading the MgAl-(p-BzOH)-LDH in certain levels. Furthermore, the composites can slowly release p-hydroxybenzoic anionic into the surrounding environment, and thus exhibit significant antibacterial activity towards G( _ ) Escherichia coli and G(+) Staphylococcus aureus.
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CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Mingyue Liu,Renliang Huang,Chuanxi Li,Mingda Che,Rongxin Su,Shuzhou Li,Jing Yu,Wei Qi,Zhimin He
Nanoscale zero-valent iron has been widely applied in environmental remediation and toxic waste treatment, especially for the degradation of persistent organic pollutants (POPs). However, the dechlorination activity of Fe nanoparticles (Fe NPs) can be suppressed by the precipitation of iron oxides generated from the corrosion of Fe-Pd NPs under alkaline conditions, leading to a decreased dechlorination efficiency. Faced with this challenge, we report a highly effective dechlorination system that functions over a broad pH range and especially well under alkaline conditions in this work. Procyanidin (PROC), a natural polyphenol, was utilized as a stabilizer to manipulate the size distribution of Fe-Pd NPs and, more importantly, as a scavenger of Fe ions to prevent iron oxide precipitation. Experiments and theoretical calculations reveal that the generated Fe ions was mainly present in the form of bis- and tris-PROC-Fe complexes in the reaction solution. Compared with pristine Fe-Pd NPs, the PROC-modified Fe-Pd NPs had a dechlorination efficiency that was increased 20-fold (pH 9.0). Notably, a normalized rate constant was enhanced by more than 2 orders of magnitude compared to the previously reported dechlorination systems. The PROC-modified Fe-Pd NPs showed excellent dechlorination efficiency over a wide pH range (2.3–13.0).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Zhou,Zixin Jia,Lingling Shi,Zhen Wu,Binyong Jie,Siyuan Zhao,Liyuan Wei,Aiguo Zhou,Junwu Zhu,Xin Wang,Yongsheng Fu
Young-Laplace equation and Kelvin equation, as two important and foundational laws in interface physico-chemistry, can reasonably interpret many complicated physico-chemical phenomena at interfaces and have been widely applied to many practical problems arisen from the production and humankind activities. In this work, by means of the large pressure difference generated on a curved surface of nano-sized liquid under the action of surface tension, the transformations from the hollow carbon nanospheres to the carbon nanobowls and the phosphorus-doped carbon nanobowls have been successfully achieved. Compared with the hollow carbon nanospheres, the carbon nanobowls and phosphorus-doped carbon nanobowls possess high packing densities, which are beneficial to form a favorable conductive pathway, leading to enhanced electrochemical performance. In particular, the phosphorus-doped carbon nanobowls, as electrode material for supercapacitors, show a high specific capacitance of 246.22 F cm −3 (273.58 F g −1 ) and can maintain the capacitance at a high current density of 10 A g −1 without noticeable decay over 40,000 cycles. More importantly, the symmetric supercapacitor based on the phosphorus-doped carbon nanobowls exhibits high energy density and power density as well as excellent cycling stability. This work widens the application of Young-Laplace equation in bowl-like materials and offers new insights into the formation mechanism.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Hu Yuanxia,Ma Jinghong,Gong Jinghua
The hydrophobic random copolymer P(HEMA-MMA-SMA) which contained 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and stearyl methacrylate (SMA) chains was successfully synthesized via radical polymerization. The composites membranes of poly (vinylidene fluoride) (PVDF) and P(HEMA-MMA-SMA) blends and PVDF/P(HEMA-MMA-SMA)/SiO 2 were prepared by electrospinning. Scanning Electron Microscopy (SEM) and Water Contact Angle (WCA) revealed that morphology and hydrophobic properties of the membrane surface. With the condition of 12 wt% SiO 2 , the maximum WCA (154°) of the electrospun composite film can be obtained. Superhydrophobic materials have been widely used in the fields, such as oil-water separation and self-cleaning. Keywords Methacrylate Poly(vinylidene fluoride) SiO 2 Random copolymer Blends Superhydrophobic Electrospinning Membranes
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高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2018
·Vol. 233
·期 2
·303-313
·
IF 1.144
Bingbing Hou,Peng Peng,Ping Zhang,Cuiping Zhai
UV-Vis absorption spectra, cyclic voltammetry and 1 H nuclear magnetic resonance ( 1 H NMR) spectra were applied to explore the hydrogen bond interactions of p-aminophenol hydrochloride (PAH) with H 2 O. The results indicated the hydrogen bonds were formed in PAH–H 2 O system. The anodic/cathodic peak potentials and UV-Vis absorption bands of PAH in H 2 O could be affected due to the interactions. The results of density functional theory, atoms in molecules theory and natural bond orbital analyses further confirmed the existence of hydrogen bonds between the phenolic hydroxyl, –NH 3 + protons and Cl − of PAH and H 2 O. Furthermore, the π-π stacking was suggested between PAH benzene rings from the 1 H NMR spectra at higher concentrations.
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高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Zhiqiao He,Yuanqiao Shi,Chao Gao,Lina Wen,Jianmeng Chen,Shuang Song
A novel visible-light-active BiOCl/BiVO4 photocatalyst with a p–n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO4 p–n junction. The highest activity was obtained in the BiOCl/BiVO4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO4. The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N2 purging.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19020-19026
·
IF 3.84
Feng-Xia Liang,Deng-Yue Zhang,Yi-feng Zou,Han Hu,Teng-Fei Zhang,Yu-Cheng Wu,Lin-Bao Luo
In this study, we present a simple oxide assisted p-type doping of Si nanostructures by evaporating a mixed powder composed of SiB6 and SiO. It was found that Si nanoribbons (Si NRs) which can be obtained at high SiB6 content, will give way to Si nanowires (Si NWs) when the content of SiB6 in the mixed powder was reduced. According to our transport measurement of field effect transistors (FETs) assembled on individual Si nanostructures, the as-prepared Si nanostructures with different boron doping levels all exhibit typical p-type conduction characteristics. Additionally, the electrical conductivity of the Si nanostructures can be tuned over 7 orders of magnitude from 8.98 × 102 S cm−1 for the highly doped sample to 3.36 × 10−5 S cm−1 for the lightly doped sample. We also assembled a nano-photodetector based on monolayer graphene and the as-prepared Si nanostructures, which exhibits ultra-sensitivity to 850 nm near infrared light (NIR) illumination with a nanosecond response speed (τrise/τfall: 181/233 ns). The generality of the above results suggest that the Si nanostructures are promising building blocks for future electronic and optoelectronic device applications.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2015
·
IF 3.512
Man Zhang,Rui Wang,Tao Xiang,Wei-Feng Zhao,Chang-Sheng Zhao
In this study, poly(sodium p-styrenesulfonate)/poly(methyl methacrylate) particles were facilely prepared by in situ cross-linked polymerization followed with a liquid–liquid phase inversion technique. The particles exhibited selective adsorption for cationic dyes due to the negatively charged sulfonic groups. The intra-particle diffusion process was the rate-limiting step for the adsorption of methylene blue. More than 90% of cationic dye was removed by the adsorption column of the particles after three circulations. The particles could be facilely fabricated and industrially used for wastewater treatment.
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高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 3
·687-691
·
IF 4.831
Hui Pan,Gao Wenyue,Nsabimana Jacques,Li Yunhui,Yang Xiuyun,Gao Ying,Shao Jing,Xu Guobao
The authors describe a method for amperometric determination of chloramine-T that is based on the indirect detection of chloramine-T by detecting p -quinone imine ( p -QI) that is generated by oxidation of p -aminophenylboronic acid by chloramine-T. p -QI can be detected with excellent selectivity and at low potential by using a glassy carbon electrode. Hence, the method displays attractive features such as high sensitivity, wide detection range and excellent selectivity. The electrode has two linear responses in the 50 nM to 100 μM concentration range and a 6 nM detection limit. Compared to other electrochemical methods, this assay has a detection limit that is better by three orders of magnitude. The relative standard deviation is 3.4% for the determination of 10 μM of the medical chloramine-T sample, and the recovery of a samples containing chloramine-T at a level of 10 μM is 115%.
Highly sensitive electrochemical detection of chloramine-T is achieved based on the reaction of chloramine-T with p -aminophenylboronic acid with a detection limit of 6 nM.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2017
·
IF 2.499
Dou Zhang,Zhong Wu,Xue-fan Zhou,An-qi Wei,Chao Chen,Hang Luo
Dielectric materials with high energy storage density are attracting scientific and commercial interest due to the prospect of application in advanced electronic devices and electric power systems. Ceramic/polymer composite is one of the most promising materials to obtain high energy density because it combines high permittivity from ceramic and high breakdown strength as well as flexibility from polymer matrix. However, the homogeneous dispersion and compatibility of nanoparticles in polymers matrix are still of great challenges due to the different surface energy between inorganic fillers and organic polymer matrix. Interfaces modification for ceramic fillers is an effective way to ease the mentioned problems. Herein, we proposed a low-cost and environmentally friendly route to prepare a core–shell structure by paraffin engineer the BaTiO 3 nanoparticles. The modified BaTiO 3 nanoparticles exhibited homogeneous dispersion in the ferroelectric polymer poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix and strong interfacial adhesion with the polymer matrix. The nanocomposites prepared in this work showed notably enhanced energy storage density. The maximum storage energy density of the nanocomposite with 50 vol% BaTiO 3 increased to 21.1 J/cm 3 at 150 kV/mm. These results indicate that paraffin is an effective modifier to prepare high energy storage density capacitor.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Xinhua Cao,Na Zhao,Aiping Gao,Haiting Lv,Yuling Jia,Renmiao Wu,Yongquan Wu
Two new gelators containing bis-naphthalimides group were designed and synthesized. The gelator 1b could form gels in DMF and mixed solvent of DMSO/H 2 O (10/1, v/v). The self-assembly processes of 1b in two kinds of solvents were detailedly investigated by UV–vis, fluorescence, infrared spectroscopy, field emission scanning electron microscope (FE-SEM), X-ray diffraction and contact angle experiments. The experiment results showed the hydrogen bonding was the main force for the gel formation. The gel 1b formed in mixed solvent of DMSO/H 2 O (10/1, v/v) possessed of the ability of distinguishing of o -phenylenediamine, m -phenylenediamine and p -phenylenediamine. At the same time, the gelator 1b could selectively and sensitively detect p -phenylenediamine in solution with the detection limit of 8.961 × 10 − 8 M L − 1 . The detection experiment was also confirmed by DFT theoretical calculations. This research would expand the supramolecular self-assembly materials application in sensor field and offer a new detection method for organic amines.
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PubMed
高影响因子
PHARMACOLOGICAL RESEARCH
·
2017
·
IF 4.48
Yuchao Sun,Mengqiao Lian,Yuan Lin,Bin Xu,Yanli Li,Jin Wen,Dapeng Chen,Ming Xu,Marwan Almoiliqy,Li Wang
Intestinal ischemia reperfusion (I/R) may cause inflammation-, oxidative stress-, and apoptosis-related tissue injuries and facilitate bacterial infection, leading to multiple organ failure. Myricetin , a flavonoid , is found to have diverse biological effects including anti-inflammatory, anti-oxidative, and anti-bacterial effects. Based on our pre-experiment, we proposed that myricetin pretreatment (25, 50 mg/kg) could ameliorate intestinal I/R injury and myricetin-induced modulation on MKK7/JNK signal pathway might play a key role in the amelioration. The present study was designed to verify the proposal by using both rat intestinal I/R model in vivo and hypoxia/reoxygenation (H/R)-injured intestinal epithelial cell line (IEC-6 cells) model in vitro. The results confirmed our proposal. Myricetin selectively ameliorated I/R- and H/R-induced injuries in vivo and in vitro respectively without significantly affecting the corresponding normal controls. Myricetin significantly alleviated I/R-induced rat intestinal injury by reducing the generation of pro-inflammatory cytokines including TNF-α, IL-1β, and IL-6 and by reducing MPO activity. Myricetin significantly reduced oxidative stress through decreasing MDA level and increasing the levels of SOD and GSH in the intestinal tissues compared with I/R control rats. Myricetin significantly decreased apoptosis by selectively down-regulating the expression of p-MKK7 and p-JNK without affecting MKK7 and JNK, inhibiting Bax, caspase-3 protein expression, and up-regulating Bcl-2 protein expression in I/R-injured jejunum of rats. In vitro study indicated that MKK7 siRNA transfection significantly decreased both MKK7 and p-MKK7 and other apoptosis-related proteins, partially simulating myricetin-induced anti-apoptotic effects. MKK7 siRNA transfection + myricetin could not further decrease MKK7, p-MKK7, and other apoptosis-related proteins, suggesting that inhibition of MKK7/JNK pathway plays a key role in myricetin-induced protection against intestinal I/R. MKK7 overexpression by cDNA transfection abrogated myricetin-reduced apoptosis-related protein expression, confirming that the MKK7/JNK signal pathway is the key target for myricetin-induced amelioration. The present study indicated that pretreatment of myricetin induced selective protection against intestinal I/R injury without significantly affecting corresponding normal controls and p-MKK7 was the key target, suggesting that myricetin is worth further translational studies.
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PubMed
高影响因子
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