Nano Research
·
2018
·Vol. 11
·期 3
·1379-1388
·
IF 7.994
Liu Xiao-Yuan,Zhang Guozhen,Chen Hao,Li Haowen,Jiang Jun,Long Yi-Tao,Ning Zhijun
The development of photocatalysts that can effectively harvest visible light is essential for advances in high-efficiency solar-driven hydrogen generation. Herein, we synthesized water soluble CuInS 2 (CIS) and Cu-In-Zn-S (CIZS) quantum dots (QDs) by using one-pot aqueous method. The CIZS QDs are well passivated by glutathione ligands and are highly stable in aqueous conditions. We subsequently applied these QDs as a light harvesting material for photocatalytic hydrogen generation. Unlike most small band gap materials that show extremely low efficiency, these new QDs display remarkable energy conversion efficiency in the visible and near-infrared regions. The external quantum efficiency at 650 nm is ∼1.5%, which, to the best of our knowledge, is the highest value achieved until now in the near-infrared region.
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Nano Research
·
2018
·Vol. 11
·期 3
·1447-1455
·
IF 7.994
Cai Zhixiong,Li Feiming,Xu Wei,Xia Shujun,Zeng Jingbin,He Shaogui,Chen Xi
Perovskite nanocrystals (NCs), which have emerged as a new class of phosphors with superb luminescence properties and bandgaps that can be easily tuned using chemical methods, have generated tremendous interest for a wide variety of applications where colloidal quantum dots have been very successful as carrier sources. In this study, self-assembled films of CsPbBr 3 NCs were produced via drop casting of colloidal NCs onto glassy carbon electrodes (GCEs) to form an NC film-modified electrode. The possible fabrication process of the CsPbBr 3 NCs films was discussed. We further studied the anodic electrochemiluminescence (ECL) behavior of the perovskite CsPbBr 3 NCs film using cyclic voltammetry with tripropylamine (TPA) as a coreactant, and a possible ECL mechanism was proposed. Briefly, TPA was oxidized to produce strongly reducing radical species, which can react with electrochemically oxidized CsPbBr 3 NCs to generate excited CsPbBr 3 NCs* capable of light emission. The relative stability of the ECL emission of the CsPbBr 3 NC films under aqueous conditions was also investigated, and it was found that they showed operational stability over the first three hours, indicating suitable reliability for application as sensing materials. The results suggested that semiconducting perovskite NCs have great potential for application in the ECL field.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 10
·7621-7636
·
IF 2.993
Hua Mingqing,Xu Le,Cui Fen,Lian Jiabiao,Huang Yunpeng,Bao Jian,Qiu Jingxia,Xu Yuanguo,Xu Hui,Zhao Yan,Li Huaming
Octahedral nickel ferrite oxide (NiFe 2 O 4 ) nanocrystals with average sizes of 81, 69, 63 and 46 nm were fabricated using hexamethylenetetramine as adscititious alkali via a facile hydrothermal route at various temperatures. The formation mechanism of octahedral nickel ferrite oxide nanocrystals was discussed in detail. Interestingly, the nanocrystalline size decreased with the increase in the hydrothermal reaction temperature. We studied the influence of hydrothermal temperatures on the evolution of the nanocrystalline and analyzed the relationship between the sizes of the nanocrystalline and their capacitive properties. Compared to the large-sized counterpart (81, 69 and 63 nm), the small-sized nanocrystals (46 nm) presented a maximum specific capacitance (562.1 F g −1 ) and remarkable cycling stability (80.3% capacity retention after 1500 cycles) at 4 A g −1 . The excellent performance of the NiFe 2 O 4 nanocrystals (46 nm) was mainly attributed to the unique octahedral nanostructures with a small size (fully exposing more electroactive sites and providing more sufficient expressways for rapid charge transfer) and their compositional advantages of nickel and cobalt (multiple oxidation states for redox reactions and relatively desirable electroconductivity). More remarkably, an asymmetric supercapacitor composed of NiFe 2 O 4 (as the positive electrode) and activated carbon (as the negative electrode) displayed an ultrahigh energy density (34.91 Wh kg −1 at 1100 W kg −1 ) and an advanced cycling stability (84.5% capacity retention after 1000 cycles), which suggested that the decreased crystal size played a pivotal role in size-dependent capacitive performance enhancement.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 124
·期 1
·1-9
·
IF 1.455
Zhao Linyan,Li Lian,Wang Yixi,Wu Jianning,Meng Guihua,Liu Zhiyong,Guo Xuhong
Oily wastewater caused by industrial production and crude oil leakage has attracted worldwide attention. Here, a thermo- and pH dual-responsive biodegradable cellulose-based aerogel for oil–water separation was designed and prepared via surface-initiated atom transfer radical polymerization (ATRP) of non-fluorine-containing 2-dimethylaminoethyl methacrylate (DMAEMA). The cellulose-based aerogel exhibit switchable superhydrophilicity with a water contact angle (WCA) of 0° and hydrophobicity (WCA 130°) by modulating pH or temperature. The functionalized cellulose-based aerogels could be used to absorb the water under 60 °C (pH 7.0) and pH is 1.0 (T = 25 °C), while absorb oil underwater when the temperature is above 60 °C (pH 7.0) or pH is 13.0 (T = 25 °C). So this adsorbent were suitable for the separation of water-rich or oil-rich oil/water mixtures, and it could adsorb oil over ten times its own weight, and had a good reusability. What’s more, the cellulose-based aerogel is green, low cost, and environmental friendly, which makes it a promising candidate to be used for oil–water separation.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 12
·1-11
·
IF 2.02
Xin Zhaopeng,Li Weixin,Fang Wei,He Xuan,Zhao Lei,Chen Hui,Zhang Wanqiu,Sun Zhimin
In this work, graphene aerogel/carbon foam is prepared by in situ inducing graphene aerogels in the pores of carbon foam. This novel hierarchical porous structure possesses a higher specific surface area as the introduction of graphene aerogels in carbon foam increases the proportion of micropores thus making it a superior candidate as electrodes for supercapacitors. The characterization and comparison of various properties of carbon foam and graphene aerogels/carbon foam have been investigated systematically. The result shows that specific surface area is up to 682.8 m 2 /g compared with initial carbon foam which increased about 55%, and the pore distribution curve shows more pore volume at 0.3 nm for F-CF/GA. It is demonstrated that the introduction of graphene aerogels not only increases the specific surface area, but also improves the conductivity, thus resulting in the reduction of the internal resistance and the improvement of the electrochemical performance. Consequently, graphene aerogel/carbon foam shows an excellent specific capacitance of 193.1 F/g at 1 A/g which is 72% higher than that of carbon foam acted as electrodes for supercapacitors.
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Food Analytical Methods
·
2018
·Vol. 11
·期 6
·1780-1788
·
IF 2.245
Zhao Zhiyong,Yang Xianli,Zhao Xiaoyan,Chen Lei,Bai Bing,Zhou Changyan,Wang Jianhua
Fusarium species are one of the common pathogenic fungi of vegetable diseases. Some Fusarium species produce toxic secondary metabolites, which have potential health risks for humans and animals. In the study, an ultra-performance liquid chromatography tandem mass spectrometry method (UPLC-MS/MS) was developed for the analysis of 13 emerging and traditional Fusarium toxins in pepper, tomato, cucumber, and potato. Samples were extracted by a modified quick, easy, cheap, effective, rugged, and safe method. Dispersive solid-phase extraction was employed for the removal of matrix interferences from the crude extracts of various vegetables. Matrix effect was compensated using matrix-matched calibration curves. The method was fully validated according to the European Commission Decision 2002/657/EC. For all the targeted analytes, good linearity ( R 2 ≥ 0.9823) was obtained. Recoveries were in the range of 62 and 114% in pepper, tomato, cucumber, and potato, with intra-day relative standard deviations lower than 14.3%. Quantitation limits of the developed method were between 0.25 and 20 μg/kg in four sample matrices. The method was successfully employed for the analysis of Fusarium toxins in vegetable samples.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 8
·6239-6250
·
IF 2.993
Chi Dequan,Liu Fei,Hao Chuncheng,Chen Jing,Na Haining,Zhu Jin
The conformational transition of cyclohexylene ring has been recognized as the secondary transition of polyesters containing this aliphatic ring structure. Previously, the stereochemistry, i.e., trans / cis ratio, has been identified as an important factor that has a significant impact on the conformational transition of the cyclohexylene ring. In this paper, we have proposed and proved the side chain effect as another important factor that plays the same role as the stereochemistry, due to the fact that the conformational transition of the ring is usually associated with the coupled motion of it with neighboring unit. Our strategy is to design and synthesize a series of polyesters with 1,4-cyclohexanedicarboxylic acid and diols with different side chains. Polyester without any side chain has the lowest secondary relaxation temperature ( T
β
). Incorporation of asymmetric short side chain will result in increased T
β
, since it will reduce the coupled motion of the neighboring unit with the cyclohexylene ring during the conformational transition process, and thus reduces the flexibility of the chain and increases steric hindrance. However, further incorporation of long side chain will result in decreased T
β
because of the plasticization effect. Moreover, we also found that polyesters with low T
β
tend to have not only better impact strength, but also good ductility and elasticity. Our study enables people to take advantage of the cyclohexylene ring structure for the design and synthesis of thermoplastic and elastomer with better performance.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-5
·
IF 3.125
Han Zhenzhen,Li Nan,Shi Aihua,Wang Haohua,Ma Feng,Lv Yi,Wu Rongqian
A SeO 2 ethanol solution as the facile precursor has been used for the preparation of quaternary Cu 2 ZnSnSe 4 (CZTSe) nanoplates. Monodispersed single-phase CZTSe nanoplates have been prepared successfully by a facile one-pot thermal chemical method. The as-prepared CZTSe nanoplates show uniform morphology with a bandgap of ~ 1.4 eV. As a proof of concept, the CZTSe nanoplates have been used as a visible-light-driven photocatalyst for Rhodamine B dye degradation and show high photocatalytic activity and stability. The excellent dye removal is mainly ascribed to the efficient light utilization of CZTSe nanoplates.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 2
·1-8
·
IF 5.705
Yang Kunhao,Pan Long,Gong Lingling,Liu Qingju,Li Zhongqiu,Wu Li,He Yujian
A highly selective method is described for the colorimetric determination of Au(III) ions in acidic solution using gold nanoparticles (AuNPs) functionalized with thiolated methoxy poly(ethylene glycol) (mPEG). The presence of Au(III) induces the aggregation of the PEG-AuNPs, and this is accompanied by a color change from wine red to blue, and a decrease in absorbance at 525 nm. This can be monitored spectrophotometrically and visually. Absorbance at 525 nm linearly drops in the 0.50 to 1.75 mg·L −1 Au(III) concentration range, with a 0.25 mg·L −1 detection limit. The method is surprisingly selective over other metal ions. It was successfully applied to the analysis of ore samples.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·4179-4189
·
IF 2.019
Han Xiaopeng,Huang Ying,Zhou Suhua,Sun Xu,Peng Xuanyi,Chen Xuefang
Due to the high agglomerate propensity of Si particles, making aluminum composites with a dispersion of the reinforcement using traditional way is still a challenge. In this study, an innovative approach was utilized to prevent the agglomeration of particles using encapsulating graphene sheets by grinding. Afterwards, the milled mixtures were incorporated with Cr-coated graphite flakes, urea and starch via mechanical mixing. After being mechanically mixed and sintered at 330 °C, the porous preform was fabricated by vacuum gas pressure infiltration. Effects of graphene content (0.5, 1, 3, 5 wt%) on the microstructures and properties of thermal and mechanical were investigated. Thermal conductivity and bending strength of the graphite flakes (G f )/Si/Al composites increased by 41.4 and 300%, respectively compared to the specimens without graphene. G f /Si/Al composites with graphene mass fraction of 5% had excellent in-plane thermal conductivity of 346 W/mK and bending strength of 84 Mpa, suggesting the composites can be applied as promising thermal management materials.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Shao Hong,Xu Dan,Ding Yadan,Hong Xia,Liu Yichun
The authors describe an “off-on” colorimetric and fluorometric assay for the determination of Cu(II). It is based on the use of upconversion nanoparticles (UCNPs) of type NaYF 4 :Yb(III),Er(III) that were functionalized with branched polyethylenimine (BPEI). A color change from colorless to blue occurs within 2 s after addition of Cu(II) to a solution of the modified UCNPs. The color change can be visually detected at Cu(II) concentrations down to 80 μM. The upconversion fluorescence of the modified UCNPs, measured at excitation wavelength of 980 nm, is reduced due to the predominant inner filter effect caused by the formation of the BPEI-Cu(II) complex. Normalized fluorescence intensity drops linearly in the 50 nM to 10 μM Cu(II) concentration range, and the fluorometric detection limit is 45 nM. Both the color and the fluorescence are recovered on addition of EDTA. Excellent selectivity over other metal ions and anions is achieved.
Upconversion nanoparticles of type NaYF4:Yb,Er were functionalized with branched polyethylenimine (UCNP/BPEI) and used in an “off-on” colorimetric and fluorometric assay for Cu(II). The upconversion fluorescence is selectively quenched on addition of Cu(II), and this is accompanied by a rapid colorless-to-blue color switch. The colorimetric changes and quenched fluorescence can be reversed by adding EDTA.
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Journal of Neuroinflammation
·
2018
·Vol. 15
·期 1
·1-13
·
IF 5.193
Liu Ru-Tao,Zhang Min,Yang Chun-Lin,Zhang Peng,Zhang Na,Du Tong,Ge Meng-Ru,Yue Long-Tao,Li Xiao-Li,Li Heng,Duan Rui-Sheng
Background With the recognition of the key roles of cellular metabolism in immunity, targeting metabolic pathway becomes a new strategy for autoimmune disease treatment. Guillain-Barré syndrome (GBS) is an acute immune-mediated inflammatory demyelinating disease of the peripheral nervous system, characterized by inflammatory cell infiltration. These inflammatory cells, including activated macrophages, Th1 cells, and Th17 cells, generally undergo metabolic reprogramming and rely mainly on glycolysis to exert functions. This study aimed to explore whether enhanced glycolysis contributed to the pathogenesis of experimental autoimmune neuritis (EAN), a classic model of GBS.Methods Preventive and therapeutic treatments with glycolysis inhibitor, 2-deoxy-d-glucose (2-DG), were applied to EAN rats. The effects of treatments were determined by clinical scoring, weighting, and tissue examination. Flow cytometry and ELISA were used to evaluate T cell differentiation, autoantibody level, and macrophage functions in vivo and in vitro.Results Glycolysis inhibition with 2-DG not only inhibited the initiation, but also prevented the progression of EAN, evidenced by the improved clinical scores, weight loss, inflammatory cell infiltration, and demyelination of sciatic nerves. 2-DG inhibited the differentiation of Th1, Th17, and Tfh cells but enhanced Treg cell development, accompanied with reduced autoantibody secretion. Further experiments in vitro proved glycolysis inhibition decreased the nitric oxide production and phagocytosis of macrophages and suppressed the maturation of dendritic cells (DC).Conclusion The effects of glycolysis inhibition on both innate and adaptive immune responses and the alleviation of animal clinical symptoms indicated that enhanced glycolysis contributed to the pathogenesis of EAN. Glycolysis inhibition may be a new therapy for GBS.
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