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RISS 인기검색어
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- 저자 : Yijie Yin (검색결과 4 건)
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Zhihao Chen,Yijie Jin,Wenzhong Yang,Bin Xu,Yun Chen,Xiaoshuang Yin,Ying Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
Polypyrrole (PPy) coatings were successfully electrosynthesized on the carbon steel by embedding SnO2and Sb-SnO2 nanoparticles (NPs). The associated structural, morphology, hydrophobic, physicalproperties, anti-corrosion and self-healing performance of these coatings were systematically studiedby several tests. XRD results showed that SnO2 had a tetragonal rutile structure and the lattice parametersindicated that Sb ions were successful substituted into SnO2 lattice. The average size of SnO2 NPs wasdecreased by the incorporation of Sb-SnO2 NPs, which were found through TEM images. The contactangle test showed that the hydrophobic of PPy coatings was greatly enhanced by the incorporation of Sb-SnO2 NPs. SEM results revealed that Sb-SnO2/PPy coating exhibited a more compact and uniform surfacethan SnO2/PPy coating, hence the physical barrier effect was significantly strengthened. Theelectrochemical measurements confirmed the excellent anti-corrosion and self-healing ability of Sb-SnO2/PPy coating for a long immersion time in HCl solution. The superior anti-corrosion performance ofSb-SnO2/PPy coating was ascribed to the synergistic effects of the anodic protection combined with theself-healing effect, the excellent physical barrier effect with compact, smooth and hydrophobic coatingsurface as well as the formation of p-n junction with decreased charge transfer.
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Jixiang Wang,Jianming Pan,Yijie Yin,Runrun Wu,Xiaohui Dai,Jiangdong Dai,Lin Gao,Hongxiang Ou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
Thermal-responsive and magnetic molecularly imprinted polymers (TMMIPs) based on Fe3O4@carbon (Fe3O4@C) were prepared by free radical polymerization and applied to selective adsorption and controlled release of 2,4,5-trichlorophenol (2,4,5-TCP) from aqueous solution. TMMIPs were composed of multilayer structure, and exhibited magnetic sensitivity, magnetic stability and thermal stability (especially below the. The reversible transform of mean diameter resulted from the change of testing temperature, indicating the thermo-responsive properties of TMMIPs. Selective adsorption and controlled release of 2,4,5-TCP were also investigated at 25 8C and higher temperature (such as 45 8C and 60 8C), respectively.
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Shear Adhesion of Tapered Nanopillar Arrays
Cho, Younghyun,Minsky, Helen K.,Jiang, Yijie,Yin, Kaiyang,Turner, Kevin T.,Yang, Shu American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.13
<P>Tapered nanopillars with various cross sections, including cone-shaped, stepwise, and pencil-like structures (300 nm in diameter at the base of the pillars and 1.1 μm in height), are prepared from epoxy resin templated by nanoporous anodic aluminum oxide (AAO) membranes. The effect of pillar geometry on the shear adhesion behavior of these nanopillar arrays is investigated via sliding experiments in a nanoindentation system. In a previous study of arrays with the same geometry, it was shown that cone-shaped nanopillars exhibit the highest adhesion under normal loading while stepwise and pencil-like nanopillars exhibit lower normal adhesion strength due to significant deformation of the pillars that occurs with increasing indentation depth. Contrary to the previous studies, here, we show that pencil-like nanopillars exhibit the highest shear adhesion strength at all indentation depths among three types of nanopillar arrays and that the shear adhesion increases with greater indentation depth due to the higher bending stiffness and closer packing of the pencil-like nanopillar array. Finite element simulations are used to elucidate the deformation of the pillars during the sliding experiments and agree with the nanoindentation-based sliding measurements. The experiments and finite element simulations together demonstrate that the shape of the nanopillars plays a key role in shear adhesion and that the mechanism is quite different from that of adhesion under normal loading.</P> [FIG OMISSION]</BR>
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Analysis of high speed bearing based on virtual rods model
Guang Zeng,Chunjiang Zhao,Xiaokai Yu,Yufeng Yin,Zhigang Xiao,Yijie Feng 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.5
The traditional high-speed ball bearing analysis is based on the quasi-static model proposed by Jones-Harris (J-H). This study gives another bearing analysis model based on the relative position of the ball center and the centers of curvature of the raceway grooves, described by the virtual rods. Specifically, the load and deformation of the virtual rods are determined according to the principle of force transmissibility, the translation theorem of a force, and elastic-contact deformation between steel ball bearings and raceway grooves. And the iterative variables such as the axial, radial and angular deformations are gradually introduced into the calculation model to solve the force and kinematic parameters under pure axial load, bidirectional and tri-directional combined loads. The correctness of the virtual rods model is verified by the contact angle for axial and bidirectional load. The influence of gyroscopic moment and raceway grooves control parameter on the actual contact angle under tridirectional loading conditions are calculated and analyzed respectively. The proposed model uses fewer equations and lower-dimension parameters than those used by the traditional highspeed ball bearing analysis method, improves the solution rate of the equations.
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