JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 6
·5715-5722
·
IF 1.798
Tao Chaoyou,Yuan Xiaodong,Yin Qiang,Yan Hongwei,Ni Wei,Yan Lianghong,Zhang Lin
Europium(III) complexes have attracted tremendous interests from scientists for their excellent properties and their important potential applications in the fields of organic light emitting diodes, biological labeling, laser media. In this paper, two novel europium(III) complexes having 2-thenoyltrifluoroacetylacetone (tta) as the first ligand and the second ligands bearing benzimidazole groups were synthesized and characterized by FT-IR, UV–Vis, 1 H-NMR, and elemental analysis. The photoluminescent properties of complexes in the solid state, in ethanol solution and embedded in poly(methyl methacrylate) (PMMA) were investigated. All europium(III) complexes exhibited strong luminescent intensity, high quantum yields (Φ) and long luminescent lifetimes. The intrinsic luminescent quantum yields (Φ LN ) and the stimulated emission cross-section (σ p ) of complexes were obtained based on the emission spectra and luminescent lifetimes of 5 D 0 excited state for europium(III) ion. All europium(III) complexes exhibited relatively high intrinsic luminescent quantum yields. In view of σ p values, which are the same order as the values of Nd-glass laser for practical use, these europium(III) complexes may find potential applications in the field of high-power laser media.
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JOURNAL OF NANOPARTICLE RESEARCH
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2016
·Vol. 18
·期 2
·1-11
·
IF 2.101
Du Yingying,Yang Ping,Matras-Postolek Katarzyna,Wang Junpeng,Che Quande,Cao Yongqiang,Ma Qian
A silanization process was employed to transfer hydrophobic quantum dots (QDs) prepared via an organic route at high temperature into water phase. The QDs were further coated with a thin organic SiO 2 shell to form QDs@SiO 2 composite nanoparticles by ligand exchange or remaining initial organic ligands on the surface. In this study, QDs with different ligands, either trioctylphosphine oxide (TOPO) or oleic acid (OA), were employed to investigate the effects of ligands on the reverse micelles in preparing QDs@SiO 2 nanoparticles. In the preparing process, hydrophobic QDs were silanized by partially hydrolyzed tetraethyl orthosilicate (TEOS). For TOPO-capped CdSe QDs, surface TOPO ligands were completely replaced by partially hydrolyzed TEOS. As for OA-capped CdSe/Cd
x
Zn 1− x
S QDs, surface OA ligands were partially replaced. It was found that the ligand exchange drastically reduced the photoluminescence (PL) efficiency of CdSe QDs. Furthermore, the cytotoxicity studies of QDs@SiO 2 have been carried out in detail. The results indicate that CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 composite nanoparticles exhibit lower cytotoxicity compared with CdSe QDs@SiO 2 , because the SiO 2 shell and remained OA ligand layer can effectively prevent the leakage of toxic Cd 2+ ions. Meanwhile, it was found that these CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 nanocomposites could keep excellent PL properties even for 24 h incubating with Siha cells, which indicating that our prepared composite nanoparticles are potentially applicable for cell imaging in biological systems.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 3
·823-831
·
IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 8
·2460-2468
·
IF 1.408
Wang Jun,Song Hao,Yang Xuzhao,Zou Wenyuan,Chen Yufei,Duan Shaochan,Sun Jun
The density, viscosity, and refractive index of a pure asymmetrical dicationic ionic liquid, 1-(1-methypiperidinium-1-yl) pentane-(1-pyridinium) bis(trifluoromethane)sulfonamide, and its binary mixtures with acetonitrile were investigated at temperatures from 293.15 K to 323.15 K over the entire range of composition at ambient pressure. From the experimental data, the excess molar volumes, dynamic viscosity deviations, and refractive index deviations were, respectively,calculated and correlated with Redlich-Kister-type polynomials. The temperature dependence of viscosity for pure ionic liquid was described by modified Vogel–Tammann-Fulcher (VTF) equation. The enthalpy and entropy of activation for viscous flow were obtained. The values of molar refraction and polarizability indicated that the dominant interactions between ionic liquids and acetonitrile were dipole-dipole molecular interactions. These thermodynamic properties were discussed in terms of nature of molecular interactions between the ionic liquid and acetonitrile.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 21
·5779-5787
·
IF 3.125
Wang Yuedan,Zhou Zhou,Qing Xing,Zhong Weibing,Liu Qiongzhen,Wang Wenwen,Li Mufang,Liu Ke,Wang Dong
Fiber organic electrochemical transistors (FECTs) based on polypyrrole and nanofibers have been prepared for the first time. FECTs exhibited excellent electrical performances, on/off ratios up to 10 4 and low applied voltages below 2 V. The ion sensitivity behavior of the fiber organic electrochemical transistors was investigated. It exhibited that the transfer curve of FECTs shifted to lower gate voltage with increasing cations concentration, the sensitivity reached to 446 μA/dec in the 10 –5 –10 –2 M Pb 2+ concentration range. The ion selective properties of the FECTs have also been systematically studied for the detection of potassium, calcium, aluminum, and lead ions. The devices with different cations showed great difference in response curves. It was suitable for selectively monitoring Pb 2+ with respect to other cations. The results indicated FECTs were very effective for electrochemical sensing of lead ion, which opened a promising perspective for wearable electronics in healthcare and biological application.
The schematic diagram of fiber organic electrochemical transistors based on polypyrrole and nanofibers for ion sensing.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 18
·8728-8736
·
IF 2.302
Huang Huabo,Yao Junlong,Li Liang,Zhu Fen,Liu Zhitian,Zeng Xiaoping,Yu Xianghua,Huang Zhiliang
In the present work, by using the in situ polymerization of aniline in acidic aqueous solution of PVA and freezing–thawing method, the reinforced conducting polymer hydrogel of polyaniline/polyvinyl alcohol (PANI/PVA) was prepared and directly used as the self-supported electrode for supercapacitor. The chemical structure of PANI/PVA hydrogel was characterized by UV–Vis, and the three-dimensional (3D) interconnected hierarchical nanoporous structure was observed by scanning electron microscopy. The measurement of compressive strength demonstrated the high mechanical strength of the hydrogel. The electrochemical properties of PANI/PVA hydrogel electrodes were evaluated by using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge, which indicated their good responsiveness and rate capability, low resistance, high specific capacitance (240 F/g at current density of 1 A/g) and excellent cycling stability. The easily fabricated PANI/PVA hydrogel combined hierarchical nanoporous microstructure, self-supported feature and favorable capacitive behavior and provided a new strategy for constructing high-performance electrode for supercapacitors.
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-13
·
IF 2.584
Yang Yao,Zhang Jingjing,Xia Fangfang,Zhang Chunlei,Qian Qirong,Zhi Xiao,Yue Caixia,Sun Rongjin,Cheng Shangli,Fang Shan,Jin Weilin,Yang Yuming,Cui Daxiang
How to realize targeted photoacoustic imaging, enhanced immunotherapy, and photothermal therapy of gastric cancer has become a great challenge. Herein, we reported for the first time that human cytokine-induced killer cells (CIK) loaded with gold nanorods were used for targeted photoacoustic imaging, enhanced immunotherapy, and photothermal therapy of gastric cancer. Silica-modified gold nanorods were prepared; then incubated with human cytokine-induced killer cells (CIK), resultant human CIK cells loaded with Au nanorods were evaluated for their cytotoxicity, targeted ability of gastric cancer in vitro and in vivo, immunotherapy, and photothermal therapy efficacy. In vitro cell experiment shows that human CIK cells labeled with gold nanorods actively target gastric cancer MGC803 cells, inhibit growth of MGC803 cells by inducing cell apoptosis, and kill MGC803 cells under low power density near-infrared (NIR) laser treatment (808-nm continuous wave laser, 1.5 W/cm2, 3 min). In vivo experiment results showed that human CIK cells labeled with gold nanorods could target actively and image subcutaneous gastric cancer vessels via photoacoustic imaging at 4 h post-injection, could enhance immunotherapy efficacy by up-regulating cytokines such as IL-1, IL-12, IL-2, IL-4, IL-17, and IFN-γ, and kill gastric cancer tissues by photothermal therapy via direct injection into tumor site under near-infrared (NIR) laser irradiation. High-performance human CIK cells labeled with Au nanorods are a good novel theranostic platform to exhibit great potential in applications such as tumor-targeted photoacoustic imaging, enhanced immunotherapy, and photothermal therapy in the near future.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 9
·4320-4327
·
IF 2.302
Dai Fei,Chen Feng,Wang Tao,Feng Shaoguang,Hu Chunlin,Wang Xinling,Zheng Zhen
Epoxy adhesive as an engineering material has more and more applications in industry. But to date, water resistance of the adhesive is still a very difficult problem to be solved. By mimicking mussel adhesive proteins, dopamine (DA) was applied as one of the two curing agents of epoxy adhesive to improve the water resistance of the adhesive, and the other was phenethylamine (PEA). The effects of the contents of DA on both adhesion property and water absorption of epoxy/PEA/DA adhesives were investigated in detail. The results of lap shear test (LST) showed that the adhesion strength of the epoxy adhesives after the introduction of proper amount of DA was still up to 7 MPa even after the sample was immersed in water for over 230 days. And then the effects of metal ions Zn(II) and Fe(III) on the adhesion properties of the epoxy adhesives were also further studied. It was found that the adhesion strength of the adhesives, when the content of DA was no more than 5 wt%, can be further increased through the complexation of a small quantity of ferric ions with DA. The coordination mechanism of catechol with Fe(III) ions in the system has been investigated by both UV/Vis spectra and XRD curves. The results testified that more bis-catecholate complexes form at high DA: Fe ratios and thus the adhesives have higher cohesion strength for having more regular structures after curing. In a word, the introductions of proper amount of DA and metal ion endow the epoxy adhesive better water resistance and excellent adhesion properties.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2442-2451
·
IF 2.302
Cheng Shuang,Wang Jian,Lin Hongzhen,Li Wanfei,Qiu Yongcai,Zheng Zhaozhao,Zhao Xinluo,Zhang Yuegang
Transition metal chalcogenides such as FeS 2 are promising electrode materials for energy storage. However, poor rate performance and low cycling stability hinder the practical application of FeS 2 cathode in secondary batteries. In this study, highly pure pyrite FeS 2 nanocrystals (NCs) with octahedral shape and 200–300 nm size have been synthesized via a facile and environmentally benign approach based on a surfactant-free aqueous reaction. Combined with a compatible ether electrolyte, the prepared FeS 2 NCs, despite their dimension far beyond the quantum confined regime, could achieve high utilization and reversibility as a cathode active material due to the well-defined crystal structure and the uncapped rough surfaces. Furthermore, we find that the last charging voltage step of FeS 2 only contributes a minor capacity but caused severe capacity fading due to the formation of soluble polysulfides. By suppressing this step through setting a proper upper cut-off voltage, the cycle life of the Li/FeS 2 cell is dramatically improved. The Li/FeS 2 cell running over a voltage window of 1.0–2.4 V at 1C delivers an initial capacity of 486.1 mA h g −1 , slightly lower than that running over 1.0–3.0 V (561.1 mA h g −1 ), but outperforms the latter substantially after 500 cycles (367 mA h g −1 vs 315 mA h g −1 ), corresponding to a capacity decay rate as low as 0.048% per cycle. Our results provide a meaningful approach for the development of not only the advanced FeS 2 material for long-life rechargeable batteries, but also other transition metal chalcogenide nanomaterials for a variety of potential applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1926-1937
·
IF 2.76
Jin Mingjie,Long Mingce,Su Hanrui,Pan Yue,Zhang Qiuzhuo,Wang Juan,Zhou Baoxue,Zhang Yanwu
To develop highly efficient and conveniently separable iron containing catalysts is crucial to remove recalcitrant organic pollutants in wastewater through a heterogeneous Fenton-like reaction. A maghemite/montmorillonite composite was synthesized by a coprecipitation and calcination method. The physiochemical properties of catalysts were characterized by XRD, TEM, nitrogen physisorption, thermogravimetric analysis/differential scanning calorimetry (TG/DSC), zeta potential, and magnetite susceptibility measurements. The influence of calcination temperatures and reaction parameters was investigated. The calcined composites retain magnetism because the presence of montmorillonite inhibited the growth of γ-Fe 2 O 3 nanoparticles, as well as their phase transition. The catalytic activities for phenol degradation were significantly enhanced by calcinations, which strengthen the interaction between iron oxides and aluminosilicate framework and result in more negatively charged surface. The composite (73 m 2 /g) calcined at 350 °C had the highest catalytic activities, with more than 99 % phenol reduction after only 35 min reaction at pH 3.6. Simultaneously, this catalyst exhibited high stability, low iron leaching, and magnetically separable ability for consecutive usage, making it promising for the removal of recalcitrant organic pollutants in wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1757-1768
·
IF 2.76
Zhao Yanxia,Sun Yangyang,Tian Chang,Gao Baoyu,Wang Yan,Shon Hokyong,Yang Yanzhao
Titanium-based coagulation is expected to achieve both efficient water purification and sludge recycling. This study is the first attempt to use titanium tetrachloride (TiCl 4 ) for silver nanoparticle (AgNP)-humic acid composite contaminant removal in a coagulation-ultrafiltration (C-UF) process, where characterization of flocs and membrane fouling under varied coagulant dose, initial solution pH, and AgNP concentration conditions are the main contents. Results suggested that the TiCl 4 achieved high AgNP removal in the form of silver nanoparticle through adsorption and sweep flocculation and simultaneously exerted additional 68.2 % higher dissolved organic carbon removal than Al 2 (SO 4 ) 3 . The TiCl 4 produced larger and stronger flocs but with weaker recoverability and less compact degree than did Al 2 (SO 4 ) 3 . Floc properties were independent of AgNP concentration except floc fractal dimension, which was negatively correlated with AgNP concentration. The TiCl 4 precoagulation caused less membrane fouling within wider pH range than Al 2 (SO 4 ) 3 did in the C-UF process. Incorporation of AgNPs during the TiCl 4 pretreatment process facilitated the mitigation of membrane fouling, which was, however, negligibly influenced by AgNP concentration in the case of Al 2 (SO 4 ) 3 .
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2016
·Vol. 87
·期 1
·45-51
·
IF 1.253
Zhou Mi,Cai Songtao,Li Jie,Qian Xin,Zheng Haha
A novel hybrid magnetic nanoparticle, which was fabricated by Fe 3 O 4 nanoparticle modified with β-cyclodextrin (Fe 3 O 4 @SiO 2 -GPTSCD), was prepared via a flexible method, including thermal decomposition, sol–gel process and ring-opening reaction of epoxy group. The structures had been characterized by fourier transform infrared spectra, transmission electron microscopy, and thermogravimetric analysis. The magnetic property of the resulting nanoparticles was kept, that they could be used for magnetic separation. Most excitingly, they showed high-efficiency catalytic activity with sodium hypochlorite and hydrogen peroxide as the oxidant in selective oxidation of benzyl alcohol, even higher than pure β-cyclodextrin (CD). It suggests that the hybrid nanoparticles are expected to be applied in more extensive fields, due to the combination of the activity of CD immobilized on the surface of nanoparticles and the characteristic of nanomaterials.
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