Wuhan, China

why needs to organise itself Wuhan University of Technology - located in Wuhan, Hubei, China - was merged on May 27, 2000, from the former three universities, Wuhan University of Technology , Wuhan Transportation University and Wuhan Automotive Polytechnic University . WUT is one of the leading Chinese universities accredited by the Ministry of Education and one of the universities constructed in priority by the "State Project 211" for Chinese higher education institutions. Wikipedia.


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The invention provides a radial ring rolling process for controlling strain distribution of a ring product. In the process, a ring blank is rolled by a main roll and a mandrel that are driven to rotate, while a gap between the main roll and the mandrel continuously decreases in the radial direction of the ring blank. The process includes (A) according to dimensions of the ring product and expected strain, a rolling ratio is firstly determined, dimensions of the ring blank is calculated based on the rolling ratio and the dimensions of the ring product; (B) a rotation speed curve of the mandrel is determined based on the rotation and the radial feeding speeds of the main roll; (C) the ring blank is rolled according to the rotation and radial feeding speeds of the main roll and the calculated rotation speed of mandrel in step (B).


News Article | April 17, 2017
Site: phys.org

The natural structure found within leaves could improve the performance of everything from rechargeable batteries to high-performance gas sensors, according to an international team of scientists. The researchers have designed a porous, such as the veins of a leaf, and could make energy transfers more efficient. The material could improve the performance of rechargeable batteries, optimizing the charge and discharge process and relieving stresses within the battery electrodes, which, at the moment, limit their life span. The same material could be used for high performance gas sensing or for catalysis to break down organic pollutants in water. To design this bio-inspired material, an international team comprising scientists from China, the United Kingdom, United States and Belgium is mimicking the rule known as 'Murray's Law' which helps natural organisms survive and grow. According to this Law, the entire network of pores existing on different scales in such biological systems is interconnected in a way to facilitate the transfer of liquids and minimize resistance throughout the network. The plant stems of a tree, or leaf veins, for example, optimize the flow of nutrients for photosynthesis with both high efficiency and minimum energy consumption by regularly branching out to smaller scales. In the same way, the surface area of the tracheal pores of insects remains constant along the diffusion pathway to maximize the delivery of carbon dioxide and oxygen in gaseous forms. The team, led by Prof Bao-Lian Su, a life member of Clare Hall, University of Cambridge and who is also based at Wuhan University of Technology in China and at the University of Namur in Belgium, adapted Murray's Law for the fabrication of the first ever synthetic 'Murray material' and applied it to three processes: photocatalysis, gas sensing and lithium ion battery electrodes. In each, they found that the multi-scale porous networks of their synthetic material significantly enhanced the performance of these processes. "This study demonstrates that by adapting Murray's Law from biology and applying it to chemistry, the performance of materials can be improved significantly. The adaptation could benefit a wide range of porous materials and improve functional ceramics and nano-metals used for energy and environmental applications." "The introduction of the concept of Murray's Law to industrial processes could revolutionize the design of reactors with highly enhanced efficiency, minimum energy, time, and raw material consumption for a sustainable future." Writing in Nature Communications this week, the team describes how it used zinc oxide (ZnO) nanoparticles as the primary building block of their Murray material. These nanoparticles, containing small pores within them, form the lowest level of the porous network. The team arranged the ZnO particles through a layer-by layer evaporation-driven self-assembly process. This creates a second level of porous networks between the particles. During the evaporation process, the particles also form larger pores due to solvent evaporation, which represents the top level of pores, resulting in a three level Murray material. The team successfully fabricated these porous structures with the precise diameter ratios required to obey Murray's law, enabling the efficient transfer of materials across the multilevel pore network. Co-author, Dr Tawfique Hasan, of the Cambridge Graphene Centre, part of the University's Department of Engineering, adds: "This very first demonstration of a Murray material fabrication process is incredibly simple and is entirely driven by the nanoparticle self-assembly. Large scale manufacturability of this porous material is possible, making it an exciting, enabling technology, with potential impact across many applications." With its synthetic Murray material, with precise diameter ratios between the pore levels, the team demonstrated an efficient breakdown of an organic dye in water by using photocatalysis. This showed it was easy for the dye to enter the porous network leading to efficient and repeated reaction cycles. The team also used the same Murray material with a structure similar to the breathing networks of insects, for fast and sensitive gas detection with high repeatability. The team proved that its Murray material can significantly improve the long term stability and fast charge/discharge capability for lithium ion storage, with a capacity improvement of up to 25 times compared to state of the art graphite material currently used in lithium ion battery electrodes. The hierarchical nature of the pores also reduces the stresses in these electrodes during the charge/discharge processes, improving their structural stability and resulting in a longer life time for energy storage devices. The team envisions that the strategy could be used effectively in materials designs for energy and environmental applications. Explore further: Researchers optimize the assembly of micro-/meso-/macroporous carbon for Li-S batteries More information: Xianfeng Zheng et al, Bio-inspired Murray materials for mass transfer and activity, Nature Communications (2017). DOI: 10.1038/ncomms14921


Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Jaroniec M.,Kent State University
Chemical Society Reviews | Year: 2012

Graphene, a single layer of graphite, possesses a unique two-dimensional structure, high conductivity, superior electron mobility and extremely high specific surface area, and can be produced on a large scale at low cost. Thus, it has been regarded as an important component for making various functional composite materials. Especially, graphene-based semiconductor photocatalysts have attracted extensive attention because of their usefulness in environmental and energy applications. This critical review summarizes the recent progress in the design and fabrication of graphene-based semiconductor photocatalysts via various strategies including in situ growth, solution mixing, hydrothermal and/or solvothermal methods. Furthermore, the photocatalytic properties of the resulting graphene-based composite systems are also discussed in relation to the environmental and energy applications such as photocatalytic degradation of pollutants, photocatalytic hydrogen generation and photocatalytic disinfection. This critical review ends with a summary and some perspectives on the challenges and new directions in this emerging area of research (158 references). © 2012 The Royal Society of Chemistry.


Zhou P.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Jaroniec M.,Kent State University
Advanced Materials | Year: 2014

The current rapid industrial development causes the serious energy and environmental crises. Photocatalyts provide a potential strategy to solve these problems because these materials not only can directly convert solar energy into usable or storable energy resources but also can decompose organic pollutants under solar-light irradiation. However, the aforementioned applications require photocatalysts with a wide absorption range, long-term stability, high charge-separation efficiency and strong redox ability. Unfortunately, it is often difficult for a single-component photocatalyst to simultaneously fulfill all these requirements. The artificial heterogeneous Z-scheme photocatalytic systems, mimicking the natural photosynthesis process, overcome the drawbacks of single-component photocatalysts and satisfy those aforementioned requirements. Such multi-task systems have been extensively investigated in the past decade. Especially, the all-solid-state Z-scheme photocatalytic systems without redox pair have been widely used in the water splitting, solar cells, degradation of pollutants and CO2 conversion, which have a huge potential to solve the current energy and environmental crises facing the modern industrial development. Thus, this review gives a concise overview of the all-solid-state Z-scheme photocatalytic systems, including their composition, construction, optimization and applications. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Velazquez H.D.,Ghent University | Verpoort F.,Wuhan University of Technology | Verpoort F.,Ghent University
Chemical Society Reviews | Year: 2012

The last decade has seen an increasing number of reports on the use of NHC-metal complexes for catalysis in water, therefore this review is aimed to introduce the whole research on this area, in which the use of water or aqueous/organic media is to be applied. Since the first discovery of the NHC carbenes by Arduengo, work on the synthesis of NHC-metal organometallic compounds has revolutionized the field of catalysis, gradually displacing the typical phosphine and amine-type ligands in view of their higher stability and reactivity. Aqueous catalysis has become a hot topic in Green Chemistry due to the positive implications for the use of water as reaction media. © 2012 The Royal Society of Chemistry.


Xiang Q.,Wuhan University of Technology | Yu J.,Wuhan University of Technology | Jaroniec M.,Kent State University
Journal of the American Chemical Society | Year: 2012

The production of H 2 by photocatalytic water splitting has attracted a lot attention as a clean and renewable solar H 2 generation system. Despite tremendous efforts, the present great challenge in materials science is to develop highly active photocatalysts for splitting of water at low cost. Here we report a new composite material consisting of TiO 2 nanocrystals grown in the presence of a layered MoS 2/graphene hybrid as a high-performance photocatalyst for H 2 evolution. This composite material was prepared by a two-step simple hydrothermal process using sodium molybdate, thiourea, and graphene oxide as precursors of the MoS 2/graphene hybrid and tetrabutylorthotitanate as the titanium precursor. Even without a noble-metal cocatalyst, the TiO 2/MoS 2/graphene composite reaches a high H 2 production rate of 165.3 μmol h -1 when the content of the MoS 2/graphene cocatalyst is 0.5 wt % and the content of graphene in this cocatalyst is 5.0 wt %, and the apparent quantum efficiency reaches 9.7% at 365 nm. This unusual photocatalytic activity arises from the positive synergetic effect between the MoS 2 and graphene components in this hybrid cocatalyst, which serve as an electron collector and a source of active adsorption sites, respectively. This study presents an inexpensive photocatalyst for energy conversion to achieve highly efficient H 2 evolution without noble metals. © 2012 American Chemical Society.


Patent
Wuhan University of Technology | Date: 2014-05-09

A method and an apparatus for measuring sedimentation of a solid-liquid two-phase mixture are provided. A standard work curve and/or standard mathematical model, indicating a relationship between thermal conductivity (k) and concentration () (and/or density ()), are provided for measuring sedimentation of the solid-liquid two-phase mixture. To measure the sediment, thermal conductivities (k) are measured at settling times (t) to obtain a relationship (kt). Concentrations () and/or densities () are then determined, based on the measured relationship (kt) and the standard work curve and/or the standard mathematical model. A sedimentation rate is determined according to a variation rate of the thermal conductivity. A sedimentation status, sedimentation degree, and/or complete sedimentation degree are determined according to variation rate and variation degree of the thermal conductivity (k), the concentration () and/or the density () of the solid-liquid two-phase mixture to be measured.


The disclosure relates to thermoelectric materials prepared by self-propagating high temperature synthesis (SHS) process combining with Plasma activated sintering and methods for preparing thereof. More specifically, the present disclosure relates to the new criterion for combustion synthesis and the method for preparing the thermoelectric materials which meet the new criterion.


Patent
Wuhan University of Technology | Date: 2015-09-18

This invention relates to a combined ring rolling method for spherical valve body, which has the following procedures: 1) design for ring blank by computing ring blank volume and selecting reasonable rolling ratio according to the dimensions of forged ring; 2) design for rolling gap which includes the shapes and dimensions of working surfaces of main roll, mandrel and passive rolls according to the dimensions of ring blank and forged ring, the stable deformation condition of combined ring rolling and structure requirement of rolling equipment; 3) rolling forming with three stages of surface cross rolling, ring rolling and shaping by controlling of feeding speed of main roll and working positions of passive rolls. This invention has the technical economical advantages of low consumptions of energy and materials, high productivity and low production cost.


The disclosure relates to thermoelectric materials prepared by self-propagating high temperature synthesis (SHS) process combining with Plasma activated sintering and methods for preparing thereof. More specifically, the present disclosure relates to the new criterion for combustion synthesis and the method for preparing the thermoelectric materials which meet the new criterion.

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