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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)

作者： Yanming Fu Liang Zhao Shaohua Shen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Ta-doped hematite (α-Fe 2 O 3 ) nanorod array electrodes were successfully prepared on FTO substrates using the conventional method by adding TaCl 5 in the aqueous solution directly. With the increasing of TaCl 5 dopant content, the photoelectrochemical (PEC) activity of the Ta-dopedα-Fe 2 O 3 nanorod films firstly increased and then decreased. Compared with the undoped α-Fe2O3 nanorod films, the optimal content of Ta-doped hematite sample showed about 3.5 times higher photoelectrochemical activity under the irradiation of solar light (AM 1.5, 100 mW·cm-2), as high as 0.53 mA·cm -2 at 0.5V vs. SCE(saturated calomel electrode) in 0.5 M Na 2 SO 4 . In order to analyze the mechanism of tantalum ions in changing the photoelectrode performance, all films were characterized by Raman spectra, UV-visible spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrum(EDX) and X-ray photoelectron spectroscopy (XPS). The results reveal that at low Ta doping contents, small amount of Ta is dopedinto the nanorods of α-Fe 2 O 3 films and the photocurrent improvement is mainly attributed to the reduced electron-hole recombination in the α-Fe 2 O 3 nanorod *** at high Ta doping contents, superfluous Ta dopant forms a thick tantalum oxide layer and the layer completely covers the nanorods of α-Fe 2 O 3 films. This special surface structure reduces the number of photogenerated electrons (or holes) and weakens the charge transfer ability to raise the surface charge recombination of α-Fe 2 O 3 nanorods, leading to the decreased photoelectrochemical activity.

关键词： α-Fe 2 O 3 , nanorods, photoelectrochemical, doping

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Effect of flow acceleration on deformation and adhesion dynamics of captured cells

Effect of flow acceleration on deformation and adhesion dyna...

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作者： He, L. Luo, Z.Y. Xu, F. Bai, B.F. State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University China Bioinspired Engineering and Biomechanics Center Xi'An Jiaotong University China Key Laboratory of Biomedical Information Engineering School of Life Science and Technology Xi'An Jiaotong University Xi'an 710049 China

Cell deformation and adhesion under shear flows play an important role in both cell migration in vivo and capture based microfluidic devices in vitro. Adhesion dynamics of captured cell (e.g., firm adhesion, cell rolling and cell detachment) under steady shear flows have been studied extensively. However, cell adhesion under accelerating flows is common both in vivo and in vitro, and dynamics of cell adhesion under accelerating flows remains unknown. As such, we used a mathematical model based on the front tracking method and investigated the effect of flow acceleration on deformation and adhesion dynamics of captured cells, including cell deformation index, cell shape evolution, the velocities of cell center, contact time and wall shear stress for cell rolling and detachment by using a series of parameter values for leukocyte. The results showed that the cell presented three dynamics states (i.e., firm adhesion, rolling and detachment) with increasing wall shear stress under uniform flows. Wall shear stresses were 1.12 Pa for firm adhesion and detachment, respectively. The wall shear stresses were at the range 1.48-1.63 Pa (higher than 1.12 Pa) when cell left the bottom surface of the channel under flow accelerations (a = 0.975-1.625 m/s2). The minimum of deformation index under accelerating flow was smaller than that under uniform flow. In conclusion, the flow acceleration promotes the deformation and adhesion of captured cells. These findings could further the understanding of cell migration in vivo and promote the development of capture based microfluidic devices in vitro. © World Scientific Publishing Company.

关键词： Cells

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Numerical research of dynamic characteristics in tower solar cavity receiver based on step-change radiation flux

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AIP Conference Proceedings 2013年第1期1547卷 746-757页

作者： Zhengwei Chen Yueshe Wang Yun Hao Qizhi Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an China and Beijing Institute of Space Long March Vehicle 100076 Beijing China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 Xi'an China

The solar cavity receiver is an important light-energy to thermal-energy convector in the tower solar thermal power plant system. The heat flux in the inner surface of the cavity will show the characteristics of non-continuous step change especially in non-normal and transient weather conditions, which may result in a continuous dynamic variation of the characteristic parameters. Therefore, the research of dynamic characteristics of the receiver plays a very important role in the operation and the control safely in solar cavity receiver system. In this paper, based on the non-continuous step change of radiation flux, a non-linear dynamic model is put forward to obtain the effects of the non-continuous step change radiation flux and step change feed water flow on the receiver performance by sequential modular approach. The subject investigated in our study is a 1MW solar power station constructed in Yanqing County, Beijing. This study has obtained the dynamic responses of the characteristic parameters in the cavity receiver, such as drum pressure, drum water level, main steam flow and main steam enthalpy under step change radiation flux. And the influence law of step-change feed water flow to the dynamic characteristics in the receiver also has been analyzed. The results have a reference value for the safe operation and the control in solar cavity receiver system.

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Graphitic carbon nitride modified by silicon for improved visible-light-driven photocatalytic hydrogen production

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Nanostructured Materials and Nanotechnology V - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012

作者： Wu, Po Shi, Jinwen Chen, Jie Wang, Bin Guo, Liejin International Research Center for Solar-Hydrogen Renewable and Clean Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 28 West Xianning Street Xi'an 710049 China

ISBN: (纸本)9781118205976

In this work, composites of silica and graphitic carbon nitride (g-C3N4) were conveniently synthesized through polymerization of melamine and ethyl silicate. Some basic physicochemical properties of these metal-free photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), Fourier transform infrared spectrometer (FTIR) spectra, transmission electron microscope (TEM), UV-visible diffuse reflectance spectrum and N2 adsorption-desorption measurement. The XRD patterns of all the prepared materials were dominated by the characteristic (002) peak at 27.5° of a graphitic structure, indicating that the induced Si did not destroy the crystal structure of g-C3N4). As the initial molar ratio of Si to C increased, enhanced photocatalytic activity was observed for H2 evolution from a triethanolamine aqueous solution under visible-light irradiation over the series of composites. It was proved that the introduction of Si resulted in large surface area, which is favorable for reactant-transfer and charge-migration, beneficial for photocatalysis.

关键词： X ray diffraction

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Interaction contributions in thermal conductivity of three-dimensional complex liquids

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AIP Conference Proceedings 2013年第1期1547卷 173-180页

作者： Aamir Shahzad Mao-Gang He State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University and Department of Physics Government College University Faisalabad (GCUF) Allama Iqbal Road 38000-Faisalabad Pakistan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

This work generalizes Evans' homogenous nonequilibrium molecular dynamics (HNEMD) algorithm for computing the thermal conductivity of strongly-coupled complex (dusty) plasma liquids (SCCDPLs) described by the Yukawa potential. The effects of external field strength along with different screening strengths on the conductivity of Yukawa liquids have investigated using HNEMD simulations. We have carried out some more linear and nonlinear molecular dynamics calculations of the thermal conductivity, and the obtained simulation results of SCCDPLs are presented for various plasma coupling and screening parameters. Our calculations show that Yukawa liquid exhibits a non-Newtonian behavior that the thermal conductivity increases with increasing field strength which explains interaction contributions in Yukawa conductivity, for the first time. The simulation results obtained with different external filed strengths are in reasonable agreement with earlier simulation results and with reference set of data showed deviations within less than ±10% for most of the present data point. It is shown that new simulations extended the range of field strength (0.001≤F*≤0.1) used in the earlier studies in order to find out the size of the linear regimes and to explain the nature of nonlinearity of SCCDPLs.

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Enhanced Photosynthetic Hydrogen Production of Rhodobacter sphaeroides with Deactivation of spbA and hupSL

Enhanced Photosynthetic Hydrogen Production of Rhodobacter s...

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第五届世界氢能技术大会(WHTC2013)

作者： Xueqing Wang Honghui Yang Yang Zhang Liejin Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University China

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Corrigendum to “Entrainment at T-junction: A review work” [Prog. Nucl. Energy 70 (January 2014) 221–241]

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Progress in Nuclear Energy 2014年 71卷 279-279页

作者： Zhaoming Meng Laishun Wang Wenxi Tian Suizheng Qiu Guanghui Su School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an 710049 China

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Boiling and two-phase flow phenomena of refrigerant-based nanofluids: Fundamentals, applications and challenges

Boiling and two-phase flow phenomena of refrigerant-based na...

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作者： Cheng, Lixin Liu, Lei School of Engineering University of Portsmouth Anglesea Building Anglesea Road Portsmouth PO1 3DJ United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

The study of refrigerant-based nanofluid boiling and two-phase flow phenomena is still in its infancy. This field of research provides many opportunities to study new frontiers but also poses great challenges. To summarize the current status of research in this newly developing interdisciplinary field and to identify the future research needs as well, this paper presents a comprehensive review of nucleate pool boiling, flow boiling, condensation and two-phase flow of refrigerant-based nanofluids. The effects of nanolubricants on boiling and two phase flow phenomena are presented as well. Furthermore, studies of applications and challenges of refrigerant-based nanofluids are presented and future research needs are identified. For the limited studies done so far, there are some controversies from one study to another. Conclusions and contradictions on the available refrigerant-based studies of physical properties, boiling and two phase flow are presented. According to this review, it has been realized that the physical properties have significant effects on the refrigerant-based nanofluid boiling and two-phase flow characteristics but the lack of the accurate knowledge of these physical properties has greatly limited the study in this interdisciplinary field. Furthermore, the limited available experiments and quite contradictive results have limited the understanding of the fundamentals of boiling and two phase flow phenomena. flow regimes are very important in understanding the phenomena but less investigated so far. Apparently it is still a long way to go to achieve systematic fundamental knowledge and theory in the relevant subject. Therefore, effort should be made to contribute to the physical property database of nanofluids as a first priority. Secondly, systematic accurate experiments and flow regime observations on boiling and two-phase flow phenomena under a wide range of test conditions and nanofluid types should be emphasized to understand the fundamentals.

关键词： Two phase flow

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Effect of anolyte pH and cathode Pt loading on the performance of novel MFC for electricity and hydrogen coproduction

Effect of anolyte pH and cathode Pt loading on the performan...

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第五届世界氢能技术大会(WHTC2013)

作者： Ya-Peng Liu Yun-Hai Wang Bai-Shi Wang Qing-Yun Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

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Synthesis and characterization of Cu2MS4（M=W or Mo） prepared by hydrothermal method

Synthesis and characterization of Cu2MS4（M=W or Mo） prepar...

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International Conference on Nanoscience & Technology,China 2013(ChinaNANO 2013)

作者： Huirong Liang Mingtao Li Liejin Guo Xi'an Shiyou University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The synthesis and properties of metal chalcogenides have been extensively researched because of their useful and novel properties. Most of them have been synthesized by traditional high-temperature calcination methods. However, other preparation methods have also been investigated such as solvothermal synthesis method. Pruss et al synthesized layered Cu 2 WS 4 materials with square primitive lattices by using Cu(CH 3 CN) 4 BF 4 and [NH 4 ] 2 WS 4 with the solvothermal method in 1993. Later Crossland group reported the synthesis and characterization of this kind of copper tetrathiometallide materials. In this paper, a new synthesis method of Cu 2 MS 4 ( M = W or Mo) polycrystal was proposed. Cu 2 MS 4 ( M = W or Mo) materials were prepared under the different reaction conditions by hydrothermal synthesis method, the structure of which has been solved from powder X-ray diffraction data, and the scanning electron microscope photographs of which were taken using an JEOL JSM-6700. [NH 4 ] 2 WS 4 crystal and CuCl 2 were used as the raw materials to produce Cu 2 WS 4 crystal. The prepared Cu 2 WS 4 semiconductor crystallizes in space group I-42m with cell parameters a = b = 5.4454 (3) , c = 10.0671(7) . [NH 4 ] 2 MoS 4 crystal, CuCl and ammonia were used as the raw materials to prepare Cu 2 MoS 4 crystal. The Cu 2 MoS 4 material crystallizes in space group I-42m with cell parameters a = b = 5.4087(7) , c = 10.0428(2) . Cu 2 MS 4 ( M = W or Mo) polycrystal contains layers of edge-sharing MS 4 and CuS 4 tetrahedra separated by a van der Waals gap.

关键词： hydrothermal synthesis, polycrystal, nano materials, chalcogenide.

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