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Zhiwei Liu,Mingjing Qi,Xiaoyu Qin,Dawei Huang,Xiaoyong Zhang,Xiaojun Yan 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
Structural collapse caused by uneven stress distribution is one of the main failure modes of Electron Beam Melted (EBM)Ti–6Al–4V porous meshes for medical bone implantation. In this paper, two types of porous meshes with different strutsdistributions are fabricated by EBM methods and experimentally studied through uniaxial compression tests. The first type(mesh 1) with simplified struts distribution consists of horizontal, vertical and diagonal struts, which are connected by onenode. The second type (mesh 2) has relatively complicated struts distribution with four structural nodes connected by vertical,horizontal and diagonal struts, and the inclined struts with an angle of 15° to the vertical or horizontal direction. Themechanical properties of solid Ti–6Al–4V alloy are also tested as reference for model-fitting analysis and the test resultsshow that the EBM specimen can achieve comparable tensile strength (1186.5 MPa) and elastic modulus (106.4 GPa) asthat of forging specimen. For the porous meshes, the deformation behavior of the struts along the load orientation is dominatedby buckling mechanism and the deformation behavior of the struts inclined to the load orientation is governed byboth buckling and bending mechanisms. The test results indicate that mesh 1 with relatively less inclined struts can achievebetter compressive resistance than mesh 2 when taking the factor of mesh density into consideration. Such results indicate asimple yet meaningful view that struts distributions of the porous meshes should be designed and optimized based on theirstress distribution conditions.
Liyuan Qin,Yang Wua,Zhiwei Hou,Shihui Zhang,Enchen Jiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
Swine manure activated carbon (SMAC) with self-co-doped metallic compounds and heteroatoms wasprepared by combining KOH activation with pyrolysis. The structure, electrochemical performance andadsorption of SMACs prepared with various activation temperatures, activation times, alkali-carbonratios and pickling steps were investigated. A hierarchical pore structure existed in all the SMACs, whichshowed excellent and significantly different properties, including a specific capacitance of 278 F/g, and ahigh SSA of 2321 m2/g (SMACHF), which retained 100% of its capacitance after 10,000 cycles at 5 A/g and aPb2+ adsorption capacity of 211.8 mg/g at room temperature (SMACNON). The SMACs contained heteroatomfunctional groups and Si, Ca and Mg compounds, which did not produce pseudocapacitors but didincrease the Pb2+ adsorption capacity and electrochemical cycling stability. The Pb2+ adsorption capacitiesof SMACNON, SMACPHF and SMACHF corresponded to the effect of the functional group content ratherthan the effect of the SSA. These porous carbons were derived from inexpensive swine manure, combinesuitable porosity with metallic elements and heteroatom doping, and have promising uses in multifunctionalapplications.
Dual-anchor anti-corrosion coating of copper foil for high-speed interconnects
Huijuan Shi,Guoyun Zhou,Qin Zhang,Pengju Wang,Yan Hong,Wei He,Shouxu Wang,Chong Wang,Zhiwei Han 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
In this experiment, two similar molecules with bifunctional groups have been characterized to prove theadvantages of dual-anchor molecular coating in the interfacial modification of the copper foil. The physicochemicalproperties of the modified copper foils have been studied. The obtained results indicate thatthe anti-corrosion performance and peeling strength were significantly improved for the copper foil treatedwith (2-(Methylthio)pyrimidin-4-yl)methanamine (MET), whose bonding information was analyzedvia the density functional theory calculation. It was found that the S-Cu and N-Cu bonds were bothformed on the Cu (1 1 1) surface for MET coating, and the adsorption of the double anchor pointsimproves the stability of the interface. The peeling test exhibits the function of MET coating as the adhesionpromotor between low-surface profile copper and resin for high-speed signal transmission.
Sun, Hainan,Xu, Xiaomin,Hu, Zhiwei,Tjeng, Liu Hao,Zhao, Jie,Zhang, Qin,Lin, Hong-Ji,Chen, Chien-Te,Chan, Ting-Shan,Zhou, Wei,Shao, Zongping The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.16
<P>If different active sites in a catalyst have optimal binding to different reaction intermediates and short reaction paths among them, they may work cooperatively to enhance the oxygen evolution reaction (OER) activity. Based on this design principle, in this study, we start with a B-site ordered double perovskite Sr2FeMoO6−δ with poor OER activity as the host material to fulfill the requirement of a short pathway, and then, replace Mo with Ni and Fe with Co to optimize the synergistic interplay of the multi-active sites. Replacing Mo with Ni indeed dramatically enhances the OER activity and structural/operating stability. Further improvement in OER performance is realized by partial substitution of Fe with Co, leading to the development of a material with the nominal composition of Sr2Fe0.8Co0.2Mo0.65Ni0.35O6−δ, which outperforms the noble metal oxide IrO2 and is better than most of the electrocatalysts developed based on a single descriptor, such as Ba0.5Sr0.5Co0.8Fe0.2O3−δ (eg occupancy close to unity), PrBaCo2O5+δ (O 2p-band center relative to the Fermi level), and La0.5Sr0.5CoO3−δ (charge-transfer energy) in many aspects. As a universal method, combined structural and compositional tuning to create a cooperative effect among different active sites for intermediate adsorption and reaction in an ordered structure may provide a new way for the design of superior electrocatalysts for various applications.</P>
Zhang, Jinglan,Shi, Xiaomin,Li, Yehua,Kim, Beom-Jun,Jia, Junling,Huang, Zhiwei,Yang, Tao,Fu, Xiaoyong,Jung, Sung Yun,Wang, Yi,Zhang, Pumin,Kim, Seong-Tae,Pan, Xuewen,Qin, Jun Elsevier 2008 Molecular cell Vol.31 No.1
<P><B>Summary</B></P><P>Sister chromatid cohesion is normally established in S phase in a process that depends on the cohesion establishment factor Eco1, a conserved acetyltransferase. However, due to the lack of known in vivo substrates, how Eco1 regulates cohesion is not understood. Here we report that yeast Eco1 and its human ortholog, ESCO1, both acetylate Smc3, a component of the cohesin complex that physically holds the sister chromatid together, at two conserved lysine residues. Mutating these lysine residues to a nonacetylatable form leads to increased loss of sister chromatid cohesion and genome instability in both yeast and human. In addition, we clarified that the acetyltransferase activity of Eco1 is essential for its function. Our study thus identified a molecular target for the acetyltransferase Eco1 and revealed that Smc3 acetylation is a conserved mechanism in regulating sister chromatid cohesion.</P>