Ningbo University of Technology
Ningbo, China

Ningbo University of Technology is a comprehensive provincial university located in Ningbo, Zhejiang province of the People's Republic of China. Wikipedia.

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Shi H.,Ningbo University of Technology | Magaye R.,Ningbo University of Technology | Castranova V.,U.S. National Institute for Occupational Safety and Health | Zhao J.,Ningbo University of Technology
Particle and Fibre Toxicology | Year: 2013

Titanium dioxide (TiO2) nanoparticles (NPs) are manufactured worldwide in large quantities for use in a wide range of applications. TiO2 NPs possess different physicochemical properties compared to their fine particle (FP) analogs, which might alter their bioactivity. Most of the literature cited here has focused on the respiratory system, showing the importance of inhalation as the primary route for TiO2 NP exposure in the workplace. TiO2 NPs may translocate to systemic organs from the lung and gastrointestinal tract (GIT) although the rate of translocation appears low. There have also been studies focusing on other potential routes of human exposure. Oral exposure mainly occurs through food products containing TiO2 NP-additives. Most dermal exposure studies, whether in vivo or in vitro, report that TiO2 NPs do not penetrate the stratum corneum (SC). In the field of nanomedicine, intravenous injection can deliver TiO2 nanoparticulate carriers directly into the human body. Upon intravenous exposure, TiO2 NPs can induce pathological lesions of the liver, spleen, kidneys, and brain. We have also shown here that most of these effects may be due to the use of very high doses of TiO2 NPs. There is also an enormous lack of epidemiological data regarding TiO2 NPs in spite of its increased production and use. However, long-term inhalation studies in rats have reported lung tumors. This review summarizes the current knowledge on the toxicology of TiO2 NPs and points out areas where further information is needed. © 2013 Shi et al.; licensee BioMed Central Ltd.

Jiang Z.,Ningbo University of Technology | Jiang Z.-J.,University of California at Merced
Journal of Alloys and Compounds | Year: 2012

Nanosized LiFePO 4/C core/shell nanocomposites with different carbon shell thicknesses have been synthesized by a simple two-step procedure. The effects of carbon shell thickness on the electrochemical performance of these LiFePO 4/C core/shell nanocomposites have been investigated. It shows that the LiFePO 4/C core/shell nanocomposites with low carbon shell thicknesses exhibit poor electrochemical performance when used in lithium ion batteries, presumably due to presence of structural disorders and defects in the particle surface layers. An increase of carbon shell thickness can remove the structural disorders and defects. The LiFePO 4/C core/shell nanocomposites with higher carbon shell thicknesses therefore exhibit significantly improved electrochemical performance. However, further increase of carbon shell thickness would lead to a decrease in the charge/discharge capacity of the LiFePO 4/C core/shell nanocomposites, although these LiFePO 4/C core/shell nanocomposites still exhibit high cycling stability. That is because excess carbon shell coating would hinder the penetration of the electrolyte solution into the carbon layers and the inward/outward diffusion of Li + ions through the carbon layers, which decreases the charge/discharge capacity of the LiFePO 4/C core/shell nanocomposites. © 2012 Elsevier B.V. All rights reserved.

Reaction of [(μ-SCH2)2NCH2CO 2Me]Fe2(CO)6 with 4-PyN(PPh2) 2 (Py = C5H4N) in the presence of the decarbonylating agent Me3NO·2H2O afforded unexpected complexes [(μ-SCH2)2NCH2CO 2Me]Fe2(CO)5(Ph2PNHPy-4) (1) and [(μ-SCH2)2NCH2CO2Me]Fe 2(CO)5[Ph2PP(O)Ph2] (2) in 40% and 14% yields, respectively. The new complexes 1 and 2 have been characterized by elemental analysis, IR and 1H (31P, 13C) NMR spectroscopic techniques. In addition, their structures were determined by single-crystal X-ray diffraction analysis, indicating that the monophosphine ligands in complexes 1 and 2 both reside in an axial position of the square-pyramidal coordination sphere of the Fe atoms. © 2011 Elsevier B.V. All rights reserved.

Jiang Z.-J.,South China University of Technology | Jiang Z.,Ningbo University of Technology
ACS Applied Materials and Interfaces | Year: 2014

Nitrogen-doped holey graphene hollow microspheres (NHGHSs), synthesized through a template sacrificing method, were utilized as an anode material for lithium ion batteries (LIBs). Because of their specific microspherical hollow structure comprising nitrogen-doped holey graphene (NHG), the NHGHSs can exhibit reversible capacities of ∼1563 mAh g-1 at a low rate of 0.5 C and ∼254 mAh g-1 at a high rate of 20 C, which are significantly higher than the discharge capacity of the pristine graphene and other graphene-based carbonaceous materials. These, along with their good cycling stability, clearly demonstrate the great potential of using the NHGHSs as the anode material for LIBs of both high energy and power densities. We believe that the high specific surface area, holey structure of nitrogen-doped graphene, specific microspherical hollow structure, and increased interlayer spacing between the NHG nanosheets in their hollow walls are the main origins of their high electrochemical performance. © 2014 American Chemical Society.

Liu X.-F.,Ningbo University of Technology
Journal of Organometallic Chemistry | Year: 2014

A series of diiron dithiolate complexes bearing phosphine or isocyanide ligands, as the active site models of [FeFe]H2ases, has been prepared by carbonyl substitution and structurally characterized. While complexes [(μ-EDT)Fe2(CO)5L1] (EDT = SCH 2CH2S, L1 = PPh3, 3; Ph 2PCH2PPh2, 4; tBuNC, 5) were prepared by reactions of (μ-EDT)Fe2(CO)6 (1) with PPh3, Ph2PCH2PPh2 (dppm), or tBuNC in the presence of Me3NO·2H2O in MeCN in 52-82% yields, complex (μ-EDT)Fe2(CO)4( tBuNC)2 (6) was produced by reaction of 1 with 2 equivalents of tBuNC in CH2Cl2 in 42% yield. Treatment of 1 or (μ-PDT)Fe2(CO)6 (PDT = SCH 2CH2CH2S) (2) with Me3NO· 2H2O followed by addition of 4-PyN(PPh2)2 (Py = C5H4N) gave unexpected products (μ-EDT)Fe 2(CO)5[Ph2PP(O)Ph2] (7), (μ-EDT)Fe2(CO)5(Ph2PNHPy-4) (8), (μ-PDT)Fe2(CO)5[Ph2PP(O)Ph2] (9), and (μ-PDT)Fe2(CO)5(Ph2PNHPy-4) (10) in 20-38% yields, respectively. In addition, the asymmetrically disubstituted complex (μ-EDT)Fe2(CO)4(Ph2PCH 2CH2PPh2) (11) was obtained by reaction of 1 with Ph2PCH2CH2PPh2 (dppe) in refluxing xylene in 31% yield, whereas reaction of 2 with 1,1′- bis(diphenylphosphino)ferrocene (dppf) in refluxing xylene afforded the symmetrically disubstituted complex (μ-PDT)Fe2(CO) 4[(η5-Ph2PC5H4) 2Fe] (12) in 28% yield. The complexes 3-9, 11, and 12 were characterized by elemental analysis, IR, and NMR spectroscopy, as well as for 3-7, 9, 11, and 12 by X-ray crystallography. © 2013 Elsevier B.V. All rights reserved.

A series of the mononuclear nickel(II) complexes 5-16 with N-substituted bis(diphenylphosphanyl)amine RN(PPh2)2 has been prepared and structurally characterized. Treatment of NiCl2·6H 2O with RN(PPh2)2 [R = CH2Ph, 1; CH(CH3)2, 2; CH2CH2CH 2CH3, 3; CH2CH(CH3)2, 4] in CH2Cl2/MeOH afforded the mononuclear nickel(II) dichloride complexes [RN(PPh2)2]NiCl2 [R = CH2Ph, 5; CH(CH3)2, 6; CH2CH 2CH2CH3, 7; CH2CH(CH 3)2, 8] in 66-71% yields. Further treatment of [RN(PPh2)2]NiCl2 with 1,2-ethanedithiol or 1,3-propanedithiol in the presence of triethylamine in CH2Cl 2 produced the mononuclear nickel(II) dithiolate complexes [RN(PPh2)2]Ni(SCH2CH2S) [R = CH 2Ph, 9; CH(CH3)2, 10; CH2CH 2CH2CH3, 11; CH2CH(CH 3)2, 12] and [RN(PPh2)2]Ni(SCH 2CH2CH2S) [R = CH2Ph, 13; CH(CH 3)2, 14; CH2CH2CH2CH 3, 15; CH2CH(CH3)2, 16] in 41-74% yields, respectively. All the complexes 5-16 have been characterized by 1H NMR, 31P{1H} NMR, 13C{ 1H} NMR and high resolution MS spectroscopy, and for 3, 4, 6, 9-12 by X-ray crystallography. © 2014 Elsevier B.V. All rights reserved.

Five new diacetylenic tetracobalt carbonyl complexes 2-6 with monophosphine or diphosphines have been prepared from the parent complex (μ-HCCCH 2CH2CH2CH2CCH-μ)[Co 2(CO)6]2 (1), and their structures were fully characterized. Reaction of 1 with PPh3 in the presence of Me 3NO·2H2O afforded (μ-HCCCH2CH 2CH2CH2CCH-μ)[Co2(CO) 5(PPh3)]2 (2) in 59% yield. Similarly, reaction of 1 with dppe (Ph2PCH2CH2PPh2) in the presence of Me3NO·2H2O gave (μ-HCCCH 2CH2CH2CH2CCH-μ)[Co 2(CO)5]2(dppe) (3) and (μ-HCCCH 2CH2CH2CH2CCH-μ)[Co 2(CO)6][Co2(CO)4(dppe)] (4), with a bridging diphosphine ligand, in 20% and 16% yields, respectively, whereas (μ-HCCCH2CH2CH2CH2CCH-μ) [Co2(CO)5]2(dppp) (dppp = Ph 2PCH2CH2CH2PPh2) (5) and (μ-HCCCH2CH2CH2CH2CCH-μ) [Co2(CO)5]2(dppb) (dppb = Ph 2PCH2CH2CH2CH2PPh 2) (6) were prepared by the reactions of 1 with dppp or dppb in the presence of Me3NO·2H2O in 29% and 36% yields, respectively. The new complexes 2-6 were characterized by elemental analysis, spectroscopy and, for 1-3 and 6, by X-ray crystallography. It is interesting to note that the X-ray crystal structures of 3 and 6 contain 12 and 14 atom macrocycles, respectively. © 2014 Elsevier Ltd. All rights reserved.

Jiang Z.,Ningbo University of Technology | Jiang Z.-J.,South China University of Technology
Journal of Membrane Science | Year: 2014

Polymer electrolyte membrane, as the indispensable component of a polymer electrolyte membrane fuel cell, serves a bi-function of conducting protons or hydroxide ions and separating fuels and oxidant, largely determining the performance of the corresponding polymer electrolyte membrane fuel cell. Therefore, the development of polymer electrolyte membranes that can efficiently conduct protons (for proton exchange membrane fuel cells) or hydroxide ions (for anion exchange membrane fuel cells) but block fuel permeation through membranes is a promising way to improve the electrochemical performance of polymer electrolyte membrane fuel cells. The plasma technique has shown great advantages in this area. It has been reported that the polymer electrolyte membranes modified or directly synthesized by the plasma technique exhibit superior properties, such as higher ion conductivity, low fuel permeability, high thermal and chemical stability, which provide them with great potentials as promising polymer electrolyte membranes for polymer electrolyte membrane fuel cell applications. However, the plasma polymerization is a very complicated process which involves the degradation of monomers and the formation of polymers. Therefore, the conditions used for the membrane modification and preparation must be well controlled to obtain membranes with desirable properties. This review paper is concerned with applications of the plasma technique in the preparation of polymer electrolyte membranes for uses in polymer electrolyte membrane fuel cells. The various plasma techniques that have been used for the modification and the preparation of polymer electrolyte membranes are reviewed and their associated advantages and disadvantages are discussed. © 2014 Elsevier B.V.

Jiang Z.-J.,South China University of Technology | Jiang Z.,Ningbo University of Technology | Chen W.,Ningbo University of Technology
Journal of Power Sources | Year: 2014

Nitrogen doped holey graphene (NHG), with in-plane holes in its sheet plate, has been synthesized in this work through the potassium hydroxide (KOH) etching and ball milling of nitrogen doped graphene (NG). It shows that the KOH etching and ball milling does not distinctly alter the elemental composition and the relative percentages of functional groups in NG, but produce holes in its in-plane sheet plate. The obtained NHG can then be used as an active electrode material for supercapacitors and as an active electrocatalyst for oxygen reduction reaction, and exhibits significantly higher electrochemical performance than the corresponding NG. Its improved electrochemical performance could be attributed to its specific holey structure in the sheet plate and porous structure in its randomly stacked solid, which provide it with more active edge atoms, better accessibility to electrolyte, larger accommodation space for ions, faster electrolyte diffusion and movement and so on. © 2013 Elsevier B.V. All rights reserved.

A device used for capturing micro-particles, which comprises a pressure regulator, a micro-jet nozzle, and a hydraulic device for providing injection liquid for the micro-jet nozzle; wherein the micro-jet nozzle is provided with an annular jet hole, the annular jet hole having a bottom end, a top end, an inner diameter, an entrance port located at the top end, and an injection port located at the bottom end, the output of the pressure regulator is connected to the entrance port of the micro-jet nozzle. Compared with the prior art, in the present invention, the liquid is taken as the medium, a kind of upward support on the micro-particles and a flow-around lift force perpendicular to the jet direction are generated by the micro-jet nozzle with the annular jet hole, which jointly act on the micro-particles, so as to achieve the micro-particle capture.

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