The Experts below are selected from a list of 9144 Experts worldwide ranked by ideXlab platform

Z Q Ye - One of the best experts on this subject based on the ideXlab platform.

  • Uniform axial tension effect of electroless plating Ni-P coated fiber Bragg grating
    Guangxue Jingmi Gongcheng Optics and Precision Engineering, 2012
    Co-Authors: C -f Rao, L -l Xiao, Yan Feng, Hua Zhang, Z Q Ye
    Abstract:

    To research the uniform axial tension effect of an Electroless plating Ni-P coated Fiber Bragg Grating (ENFBG), the stress and strain properties of the ENFBG were analyzed based on its axial symmetry. The finite element method was used for theoretical calculations, then it was verified by following experiments. Theoretical calculation shows that under uniform axial tension, the core of the ENFBG is drawn uniformly, the shearing strain is far less than normal strain and can be omitted. The normal strain is proportional to the axial tension, and the change of center wavelength of ENFBG is proportional to that of the tension too. However, because of the difference of mechanic parameters between electroless plating Ni-P Coating and optical fiber, the Metal Coating reduces the uniform axial tension sensitivity of the FBG. In sensor experiment, when the thickness of the Coating is 7.25 μm, the sensitivity is 12.45 pm/MPa, R-square is 0.9996, and the theoretical calculation value is 12.744 pm/MPa. Moreover, the sensitivity is decreased with the increase of the thickness of Metal Coating. The ENFBG is an excellent uniform axial tension sensor, because its center wavelength shows high linearity to uniform axial tension and its Metal Coating can provide good protection.

Mikako Hayashi - One of the best experts on this subject based on the ideXlab platform.

  • Simple observation of Streptococcus mutans biofilm by scanning electron microscopy using ionic liquids
    AMB Express, 2015
    Co-Authors: Yoko Asahi, Tetsuya Tsuda, Jiro Miura, Katsuhiko Tsunashima, Susumu Kuwabata, Takao Sakata, Yuichiro Noiri, Shigeyuki Ebisu, Mikako Hayashi
    Abstract:

    Scanning electron microscopy (SEM) has been successfully used to image biofilms because of its high resolution and magnification. However, conventional SEM requires dehydration and Metal Coating of biological samples before observation, and because biofilms consist mainly of water, sample dehydration may influence the biofilm structure. When coated with an ionic liquid, which is a kind of salt that exists in the liquid state at room temperature, biological samples for SEM observation do not require dehydration or Metal Coating because ionic liquids do not evaporate under vacuum conditions and are electrically conductive. This study investigates the ability of ionic liquids to allow SEM observation of Streptococcus mutans biofilms compared with conventional Coating methods. Two hydrophilic and two hydrophobic ionic liquids, all of which are electronic conductors, are used. Compared with samples prepared by the conventional method, the ionic-liquid-treated samples do not exhibit a fibrous extracellular matrix structure and cracking on the biofilm surface. The hydrophilic ionic liquids give clearer images of the biofilm structure than those of the hydrophobic ionic liquids. This study finds that ionic liquids are useful for allowing the observation of biofilms by SEM without preparation by dehydration and Metal Coating.

Liangbing Hu - One of the best experts on this subject based on the ideXlab platform.

  • Transient Behavior of the Metal Interface in Lithium Metal-Garnet Batteries.
    Angewandte Chemie, 2017
    Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Yunhui Gong, Eric D Wachsman, Marcus Carter, Liangbing Hu
    Abstract:

    The interface between solid electrolytes and Li Metal is a primary issue for solid-state batteries. Introducing a Metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li Metal and reduce the interfacial resistance, but the mechanism of the Metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a Metal Coating on the interfacial resistance of a solid electrolyte and Li Metal anode. Our motivation is to understand how the Metal interlayer behaves at the interface to promote increased Li-Metal wettability of the solid electrolyte surface and reduce interfacial resistance. Surprisingly, we found that the Metal Coating dissolved in the molten piece of Li and diffused into the bulk Li Metal, leading to a small and stable interfacial resistance between the garnet solid electrolyte and the Li Metal.

  • Transient Behavior of the Metal Interface in Lithium Metal–Garnet Batteries
    Angewandte Chemie - International Edition, 2017
    Co-Authors: Kun Kelvin Fu, Zhezhen Fu, Boyang Liu, Hua Xie, Yonggang Yao, Yunhui Gong, Eric D Wachsman, Marcus Carter, Liangbing Hu
    Abstract:

    © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. The interface between solid electrolytes and Li Metal is a primary issue for solid-state batteries. Introducing a Metal interlayer to conformally coat solid electrolytes can improve the interface wettability of Li Metal and reduce the interfacial resistance, but the mechanism of the Metal interlayer is unknown. In this work, we used magnesium (Mg) as a model to investigate the effect of a Metal Coating on the interfacial resistance of a solid electrolyte and Li Metal anode. The Li-Mg alloy has low overpotential, leading to a lower interfacial resistance. Our motivation is to understand how the Metal interlayer behaves at the interface to promote increased Li-Metal wettability of the solid electrolyte surface and reduce interfacial resistance. Surprisingly, we found that the Metal Coating dissolved in the molten piece of Li and diffused into the bulk Li Metal, leading to a small and stable interfacial resistance between the garnet solid electrolyte and the Li Metal. We also found that the interfacial resistance did not change with increase in the thickness of the Metal Coating (5, 10, and 100nm), due to the transient behavior of the Metal interface layer.

Sunghoon Ahn - One of the best experts on this subject based on the ideXlab platform.

  • Nano particle deposition system (NPDS) for ceramic and Metal Coating at room temperature and low vacuum condition
    2008 International Conference on Smart Manufacturing Application, 2008
    Co-Authors: Dooman Chun, Minhyeng Kim, Jaechul Lee, Sunghoon Ahn
    Abstract:

    Nano particle deposition system (NPDS) is the newly developed ceramic and Metal Coating process. Nano and micro sized powders are sprayed through the supersonic nozzle at room temperature and low vacuum condition and deposited on various substrates. In this research, ceramic titanium dioxide (TiO2) Coatings were deposited on Metal substrates (SUS, Cu, Al) and polymer substrates (PET, PMMA), and Metal tin (Sn) Coating was deposited on SUS substrate. Coatings were fabricated with rectangular and line shapes at high deposition rate and without causing thermal damage on the substrates. Deposition images and material properties such as chemical composition and morphology were measured. The test results showed that the NPDS provides a new Coating method of ceramic and Metal materials with large surface area.

  • a nano particle deposition system for ceramic and Metal Coating at room temperature and low vacuum conditions
    International Journal of Precision Engineering and Manufacturing, 2008
    Co-Authors: Dooman Chun, Minhyeng Kim, Jaechul Lee, Sunghoon Ahn
    Abstract:

    A new nano-particle deposition system (NPDS) was developed for a ceramic and Metal Coating process. Nano-and micro-sized powders were sprayed through a supersonic nozzle at room temperature and low vacuum conditions to create ceramic and Metal thin films on Metal and polymer substrates without thermal damage. Ceramic titanium dioxide (TiO₂) powder was deposited on polyethylene terephthalate substrates and Metal tin (Sn) powder was deposited on SUS substrates. Deposition images were obtained and the resulting chemical composition was measured using X-ray photoelectron spectroscopy. The test results demonstrated that the new NPDS provides a noble Coating method for ceramic and Metal materials.

Dietmar Gentsch - One of the best experts on this subject based on the ideXlab platform.

  • Characterization of Metal vapor deposition on vacuum interrupter ceramics and its impact on electric field distribution
    IEEE Transactions on Dielectrics and Electrical Insulation, 2017
    Co-Authors: Bernd Kuehn, Margot Hilbert, Ingo Gramberg, Michael Kurrat, Dietmar Gentsch
    Abstract:

    Vacuum interrupters (VI) are mainly built with ceramics as insulators. During the interruption process, the ceramics are coated with Metal vapor from the contact material. In a worst case scenario, an electrical bypass is formed by the Metal Coating on the ceramic insulators. To avoid this, dielectric shielding is used, which provides defined surfaces for vapor Coatings. Different shield arrangements offer a balance between local field stress and effective protection against impact from the Metal Coating. In our current work, we developed an electrostatic field simulation approach using COMSOL software. The purpose was to study the impact of the deposited layers on the performance of the VI with multiple shield arrangements. The simulations were done for three different cases, using the same VI geometry: VI without Metal Coating on the ceramics; VI with Metal Coating on the ceramics; E-Field distribution between the head-shield and the Metal Coating on the ceramics. The identification of the effect of Coatings on the electric field inside a VI during lightning impulse voltage stress can help to evaluate the breakdown voltage of the whole arrangement. Therefore, we simulated the redistribution of the electric field strength over the remaining insulated shields.

  • Multiple shield arrangements breakdown model in vacuum interrupters
    2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), 2016
    Co-Authors: Bernd Kuehn, Margot Hilbert, Michael Kurrat, Dietmar Gentsch
    Abstract:

    Switching chambers of vacuum interrupters (VI) are mainly built with ceramics as insulators. During the interruption process, the ceramics are coated by Metal vapor from the contact material. In a worst case scenario, an electrical bypass is formed, caused by the Metal Coating on the ceramic insulators. To avoid this, dielectric shielding is used to provide the vapor Coating surfaces with defined potentials. Different shield arrangements offer a balance between local field stress and effective protection against impact from the Metal Coating. In the current work, we developed an electric field simulation approach using COMSOL software. The purpose was to study the impact of the deposited layers on the performance of the VI with multiple shield arrangements. The simulations were done based on three different cases, using the same VI geometry: VI without Metal Coating on the ceramics; VI with graded Metal Coating on the ceramics; Breakdown condition between the head-shield and the Metal Coating on the ceramics. The identification of the effect of Coatings on the electric field inside a VI during lightning impulse voltage stress can help to evaluate the breakdown voltage of the whole arrangement. Therefore, we simulated the redistribution of the electric field strength over the remaining insulated shields.