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Zhang, Teng Fei,Kim, Kwang-Wook,Kim, Kwang Ho The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.3
<P>A new method was adopted to fabricate the nitrogen-incorporated hydrogenated diamond-like carbon ( DLC) film electrodes with TiN/TiCN/DLC multilayers on Ti substrates by a hybrid deposition technique and post annealing. The TiN and TiCN sublayers acted as adhesive layers and a nitrogen donor source for the DLC layer. Solid diffusion of nitrogen from these sublayers to the DLC layer occurred during annealing to form the N-incorporated DLC films. The electrical resistivity of the DLC films was significantly reduced by annealing process due to the graphitization and incorporation ofN. The potential windowof the DLC/Ti electrodes slightly decreased after annealing, while the electrochemical activity and catalytic ability of the electrodes for the redox of Fe(CN)(6)(3-/4-) were significantly improved, which was attributed to the decreased resistivity and the active C-N function group on the electrode surface. The optimized annealing temperature was 800 degrees C and the DLC/Ti-800 degrees C electrode exhibited comparable electrochemical characteristics with the boron-doped diamond electrode and superior properties than the Pt/Ti and glassy carbon electrodes, which made it promising electrode candidate for wastewater treatment. The correlations between the microstructure evolution and the electrochemical properties of the DLC films at various annealing temperatures were also systematically investigated. (C) 2015 The Electrochemical Society. All rights reserved.</P>
Wan, Zhixin,Zhang, Teng Fei,Lee, Han-Bo-Ram,Yang, Ji Hoon,Choi, Woo Chang,Han, Byungchan,Kim, Kwang Ho,Kwon, Se-Hun American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.48
<P>A new approach was adopted to improve the corrosion resistance of CrN hard coatings by inserting a Al2O3 layer through atomic layer deposition. The influence of the addition of a Al2O3 interlayer, its thickness, and the position of its insertion on the microstructure, surface roughness, corrosion behavior, and mechanical properties of the coatings was investigated. The results indicated that addition of a dense atomic layer deposited Al2O3 interlayer led to a significant decrease in the average grain size and surface roughness and to greatly improved corrosion resistance and corrosion durability of CrN coatings while maintaining their mechanical properties. Increasing the thickness of the Al2O3 interlayer and altering its insertion position so that it was near the surface of the coating also resulted in superior performance of the coating. The mechanism of this effect can be explained by the dense.Al2O3 interlayer acting as a good sealing layer that inhibits charge transfer, diffusion of corrosive substances, and dislocation motion.</P>
Fujisawa, Naoki,Zhang, Teng Fei,Lee, Byoung Hun,Kim, Kwang Ho Published for the Materials Research Society by th 2016 Journal of materials research Vol.31 No.23
<▼1><B>Abstract</B><P/></▼1><▼2><P>Surface roughness and finite sample thickness are major sources of error in the nanoindentation measurements of thin films as the former makes it difficult to determine the effective contact point between the indenter and sample while the latter limits the usable depth range to be no more than ∼10% of the film thickness. Combining a closed-form model of a film/substrate system with the ability of nanoindentation to monitor the contact depth, the present method defines the two-dimensional shape profile of the indenter contacting the composite system with one unknown constant associated with the model and another unknown constant associated with the effective contact point. On the basis that the obtained shape profile of the rigid indenter is identical to the pre-determined indenter shape profile function, the method extrapolates the two constants simultaneously so as to determine the effective contact point. The method was demonstrated for amorphous diamond-like carbon (DLC) coatings.</P></▼2>
Fu, Jianjian,Zhang, Teng Fei,Xia, Qixun,Lim, Sung-Hwan,Wan, Zhixin,Lee, Taeg-Woo,Kim, Kwang Ho Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Nanolaminated MAX-phase Ti2AlC thin films were synthesized by high-power impulse magnetron sputtering (HiPIMS) from a MAX-phase Ti2AlC target. The amorphous matrix Ti-Al-C films were deposited at room temperature, while the MAX-phase Ti2AlC films were obtained through annealing process of the as-deposited amorphous matrix films. The microstructure, oxidation resistance, and corrosion behavior of these two films were comparatively investigated. The results indicated that the MAX-phase Ti2AlC films had superior antioxidation and anticorrosion properties than the amorphous matrix Ti-Al-C films, which is attributed to the rapid formation of dense Al2O3layer on the top of MAX-phase Ti2AlC films because of the rapid diffusion of Al atoms in the typical nanolaminated structure of MAX phase.</P>
Enhanced Corrosion Resistance of PVD-CrN Coatings by ALD Sealing Layers
Wan, Zhixin,Zhang, Teng Fei,Ding, Ji Cheng,Kim, Chang-Min,Park, So-Won,Yang, Yang,Kim, Kwang-Ho,Kwon, Se-Hun SPRINGER SCIENCE + BUSINESS MEDIA 2017 NANOSCALE RESEARCH LETTERS Vol.12 No.1
<P>Multilayered hard coatings with a CrN matrix and an Al<SUB>2</SUB>O<SUB>3</SUB>, TiO<SUB>2</SUB>, or nanolaminate-Al<SUB>2</SUB>O<SUB>3</SUB>/TiO<SUB>2</SUB> sealing layer were designed by a hybrid deposition process combined with physical vapor deposition (PVD) and atomic layer deposition (ALD). The strategy was to utilize ALD thin films as pinhole-free barriers to seal the intrinsic defects to protect the CrN matrix. The influences of the different sealing layers added in the coatings on the microstructure, surface roughness, and corrosion behaviors were investigated. The results indicated that the sealing layer added by ALD significantly decreased the average grain size and improved the corrosion resistance of the CrN coatings. The insertion of the nanolaminate-Al<SUB>2</SUB>O<SUB>3</SUB>/TiO<SUB>2</SUB> sealing layers resulted in a further increase in corrosion resistance, which was attributed to the synergistic effect of Al<SUB>2</SUB>O<SUB>3</SUB> and TiO<SUB>2</SUB>, both acting as excellent passivation barriers to the diffusion of corrosive substances.</P>
정국현,백경래,Teng Fei Zhang,김광호,김규정,신현일,강명창 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
MAX-phase Ti2AlC bulk ceramic was rapidly fabricated by spark plasma sintering (SPS) at 1000 oC and 1100 oC. To obtainmonolithic MAX-phase Ti2AlC, the molar composition (Ti:Al:C) was varied from 1:0.9:1 to 1:1.4:1. The microstructure andmaterial properties of the Ti2AlC ceramics were systematically investigated. The results show an optimized Al mole fractionof 1.1, with which nearly pure MAX-phase Ti2AlC ceramics were synthesized. Insufficient or excessive Al content resulted inimpurities. The maximum relative density, hardness, electrical and thermal conductivities were also obtained at an Al molefraction of 1.1. These properties were superior to those of Ti-6Al-4V alloys. The micro-Electrical Discharge Machining(ì-EDM)results showed that the MAX-phase Ti2AlC ceramics exhibited smaller average micro-hole diameters, shorter machining times,and shorter electrode wear lengths after machining than commercial Ti-6Al-4V alloys, with no obvious local erosion damagenear the hole entrance and no tapering effect inside the microholes. This should be attributed to the excellent electrical andthermal characteristics of MAX phases. This demonstrates that MAX-phase Ti2AlC ceramics are promising candidate for inmicro-EDM applications.
Jianfeng Hong,Fei Pan,Ziheng Zhang,Jia Teng,Dekai He 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3
Continuous mode changes during battery charging present a significant challenge for the application of inductive power transfer (IPT) in battery charging. Achieving constant-current (CC) and constant-voltage (CV) charging characteristics is crucial for its successful implementation. This paper proposes a variable static S-T/FC compensation topology based on switching state changes. It offers the advantages of being able to handle various load conditions, facilitating soft switching of the inverter throughout the operation process, and achieving CC and CV charging without changing the operating frequency of the system. The characteristics of the proposed topology were confirmed through a theoretical analysis. Additionally, a completely new parameter design method is proposed. The CC and CV characteristics of the proposed topology are verified through theoretical derivation and simulation analysis. Finally, a validation prototype is constructed to assess the feasibility and rationality of the proposed method, achieving a 3.5 A output current in the CC mode and a 70 V output voltage in the CV mode.
Lei Zhou,Xiao-Fei An,Shi-Chao Teng,Jing-Shun Liu,Wen-Bin Shang,Ai-Hua Zhang,Yang-Gang Yuan,Jiang-Yi Yu 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.5
Diabetic nephropathy (DN) is an important diabetic complication, and podocyte apoptosis plays a critical role in the development of DN. In the present study, we examined the preventive effect of the total flavone glycosides of Flos Abelmoschus manihot (TFA) on urinary microalbumin and glomerular podocyte apoptosis in experimental DN rats. The preliminary oral administration of TFA (200 mg/kg/day) for 24 weeks significantly decreased the urinary microalbumin to creatinine ratio and 24-h urinary total protein in streptozotocin-induced DN rats. Terminal deoxynucleotidyl transferasemediated dUTP nick end-labeling assay indicated glomerular cell apoptosis in DN rats was significantly improved by pretreatment with TFA. Furthermore, fluorescence-activated cell sorting and Hoechst 33342 staining suggested preincubation with hyperoside (50 and 200 lg/mL), the major active constituent of TFA, could significantly mitigate cultured podocyte apoptosis induced by the advanced glycation end-products (AGEs). Western blot analysis showed that increased caspase-3 and caspase-8 expressions induced by AGEs were also inhibited by pretreatment with hyperoside at both doses. Our results demonstrate that TFA pretreatment can decrease urinary albumin excretion in early-stage DN, which might be accomplished by preventing renal damage and podocyte apoptosis.
C1420T Polymorphism of Cytosolic Serine Hydroxymethyltransferase and Risk of Cancer: a Meta-analysis
Zhong, Shan-Liang,Zhang, Jun,Hu, Qing,Chen, Wei-Xian,Ma, Teng-Fei,Zhao, Jian-Hua Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.5
A series of studies have explored the role of cytosolic serine hydroxymethyltransferase (SHMT1) C1420T polymorphism in cancer risk, but their results were conflicting rather than conclusive. To derive a more precise estimation of the association between C1420T and cancer risk, the present meta-analysis of 28 available studies with 15,121 cases and 18,023 controls was conducted. The results revealed that there was no significant association between the polymorphism and cancer risk overall. In stratified analysis by cancer type (breast cancer, gastrointestinal cancer, leukemia, lymphoma, and others), the results showed that 1420T allele was associated with decreased risk in leukemia (CT vs. CC: OR= 0.825, 95% CI =0.704-0.966; and CT+TT vs. CC: OR= 0.838, 95% CI = 0.722-0.973), but the same results were not present for other cancer types. When subgroup analysis was performed by source of control (population-based [PB] and hospital-based [HB]), a borderline inverse association was observed for the HB subgroup (CT vs. CC: OR= 0.917, 95% CI = 0.857-0.982) but not for the PB subgroup. Stratifying by geographic area (America, Asia and Europe), significant inverse association was only found in Asia subgroup (CT vs. CC: OR= 0.674, 95% CI = 0.522-0.870). In summary, the findings suggest that SHMT1 C1420T polymorphism is not associated with overall cancer development, but might decrease cancer susceptibility of Asians as well as reduce leukemia risk. Large well-designed epidemiological studies will be necessary to validate the risk identified in the current meta-analysis.