NANOTECHNOLOGY
·
2018
·Vol. 29
·期 18
·185602
·
IF 3.404
Zhen Hu,Qing Shao,Yudong Huang,Long Yu,Dayu Zhang,Xirong Xu,Jing Lin,Hu Liu,Zhanhu Guo
The interfacial microcracks in the resin matrix composites are difficult to be detected and repaired. However, the self-healing concept provides opportunities to fabricate composites with unusual properties. In the present study, photothermal conversion Ag–Cu2S nanoparticles were immobilized onto poly(p-phenylene benzobisoxazole) (PBO) fibers via a polydopamine chemistry. Benefitting from the photothermal effects of Ag–Cu2S, the obtained PBO fibers (Ag–Cu2S–PBO) efficiently converted the light energy into heat under Xenon lamp irradiation. Then, single PBO fiber composites were prepared using thermoplastic polyurethane as the matrix. It was found that the interfacial damage caused by single fiber pull-out was simply self-healed by Xe light irradiation. This wonderful interfacial damage self-healing property was mainly attributed to the in situ heating generation via photothermal effects of Ag–Cu2S in the composite interface. This paper reports a novel strategy to construct advanced composites with light-triggered self-healing properties, which will provide inspiration for preparing high performance composite materials.
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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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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Lujia Li,Qingxue Fu,Mengxin Xia,Lei Xin,Hongyi Shen,Guowen Li,Guang Ji,Qianchao Meng,Yan Xie
Phytic acid (IP6) is a natural phosphorylated inositol, which is abundantly present in most cereal grains and seeds. This study investigated the effects of IP6 regulation on P-glycoprotein (P-gp) and its potential mechanisms using in situ and in vitro models. The effective permeability of the typical P-gp substrate rhodamine 123 (R123) in colon was significantly increased from (1.69 ± 0.22) × 10–5 cm/s in the control group to (3.39 ± 0.417) × 10–5 cm/s (p < 0.01) in the 3.5 mM IP6 group. Additionally, IP6 can concentration-dependently decrease the R123 efflux ratio in both Caco-2 and MDCK II-MDR1 cell monolayers and increase intracellular R123 accumulation in Caco-2 cells. Furthermore, IP6 noncompetitively inhibited P-gp by impacting R123 efflux kinetics. The noncompetitive inhibition of P-gp by IP6 was likely due to decreases in P-gp ATPase activity and P-gp molecular conformational changes induced by IP6. In summary, IP6 is a promising P-gp inhibitor candidate.
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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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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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qian Liu,Changdi Wang,Jianxiang Wang,Xiangjie Cui,Xingrong Zhang,Ruiyang Zhao,Jishu Han,Lei Wang
The development of efficient and stable composite photocatalysts is crucial for advancing the field of photocatalytic hydrogen production. In this paper, the Co 0.5 CuP/Cd 0.9 Co 0.1 S composite photocatalyst was synthesized by the template etching method and the in-situ growth method. The Co 0.5 CuP was tightly anchored on the surface of hollow structure Cd 0.9 Co 0.1 S nanospheres. The hydrogen production efficiency of the Co 0.5 CuP/Cd 0.9 Co 0.1 S composite photocatalyst was enhanced by adjusting the doping proportion of cobalt and the loading quantity of Co 0.5 CuP. Meanwhile, a p-n heterojunction was formed between Co 0.5 CuP and Cd 0.9 Co 0.1 S, which enhanced the separation of photoinduced charge carriers and further boosted the efficiency of photocatalytic hydrogen production. The results showed that the photocatalytic hydrogen evolution efficiency of Co 0.5 CuP/Cd 0.9 Co 0.1 S could reach 9.64 mmol·g −1 ·h −1 . In addition, the photocatalytic reaction mechanism of the Co 0.5 CuP/Cd 0.9 Co 0.1 S composite photocatalyst was inferred based on the photoelectrochemical test and density functional theory calculation. This approach pioneers a novel pathway for the preparation of heterojunction photocatalysts by the combination of transition metal phosphide and hollow multi-metal sulfides.
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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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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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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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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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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 6
·3744-3750
·
IF 1.483
Yang Guangming,Yu Hongbo,Zhang Jianfeng,Yin Hongfeng,Ma Zhen,Zhou Shenghu
AuPd nanoparticles (NPs) protected by tetradecyl trimethyl ammonium bromide (TTAB) were coated with SiO2 through hydrolysis of tetraethylorthosilicate (TEOS). The as-synthesized AuPd@SiO2 core–shell NPs were calcined in air at 500 °C to remove TTAB and
open up mesopores within the SiO2 shells. The obtained Au–PdO@m-SiO2 NPs were reduced by H2 at 300 °C to obtain AuPd@m-SiO2 NPs with AuPd NP cores (diameter: ~3 nm) and SiO2 shells (thickness: ~18 nm). Results from relevant characterization
indicated that these SiO2-protected core–shell NPs were highly stable during calcination and subsequent reduction. Au@m-SiO2, Au10Pd@m-SiO2, Au5Pd@m-SiO2, AuPd5@m-SiO2, AuPd10@m-SiO2,
and Pd@m-SiO2 NPs with similar core sizes and shell thicknesses were also synthesized. These samples were tested in the catalytic hydrogenation of p-chloronitrobenzene. The activity and selectivity were found to be tunable, depending on the composition of the bimetallic alloys.
AuPd@m-SiO2 NPs with a 1/1 molar ratio of Au/Pd showed the highest selectivity for the hydrodechlorination of p-chloronitrobenzene.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Yi Cui,Yong-Hua Hu,Feng Yu,Jing Zheng,Lin-Shan Chen,Qing-Xi Chen,Qin Wang
This study was to investigate the inhibition effects of para -substituted cinnamic acid derivatives (4-chlorocinnamic acid, 4-ethoxycinnamic acid and 4-nitrocinnamic acid) on tyrosinase catalyzing the substrates, with the purpose of elucidating the inhibition mechanism of the tested derivatives on tyrosinase by the UV–vis spectrum, fluorescence spectroscopy, copper interacting and molecular docking, respectively. The native-PAGE results showed that 4-chlorocinnamic acid (4-CCA), 4-ethoxycinnamic acid (4-ECA) and 4-nitrocinnamic acid (4-NCA) had inhibitory effects on tyrosinase. Spectrophotometric analysis used to determine the inhibition capabilities of these compounds on tyrosinase catalyzing L-tyrosine (L-Tyr) and L-3,4-Dihydroxyphenylalanine (L-DOPA) as well. The IC 50 values and inhibition constants were further determined. Moreover, quenching mechanisms of tested compounds to tyrosinase belonged to static type and a red shift on fluorescence emission peak occurred when 4-NCA added. Copper interacting and molecular docking demonstrated that 4-CCA could not bind directly to the copper, but it could interact with residues in the active center of tyrosinase. Meanwhile, 4-ECA and 4-NCA could chelate a copper ion of tyrosinase. Anti-tyrosinase activities of para -substituted cinnamic acid derivatives would lay scientific foundation for their utilization in designing of novel tyrosinase inhibitors.
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