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- 저자 : Mengwei Liu (검색결과 2 건)
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Development of a Love Wave Based Device for Sensing Icing Process with Fast Response
Wen Wang,Yining Yin,Yana Jia,Mengwei Liu,Yong Liang,Yufeng Zhang,Minghui Lu 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
This work addresses the theoretical and experimental investigations of a Love wave based device employing waveguide structure of SiO2/36° YX-LiTaO3 for sensing icing process. The mass loading efect induced by the icing process modulates the acoustic wave propagation, and corresponding changes in device frequency can be collected to evaluate the icing process. The waveguide structure confnes the acoustic wave energy into SiO2 thin-flm, which contributes well to the improvement of the mass loading sensitivity. The corresponding sensing mechanism was analyzed by solving the acoustic propagation equations in layered structure. The sensing device patterned by delay-line on 36° YX-LiTaO3 substrate with SiO2 guiding layer was photolithographically developed as the sensor element, and characterized by using the high-low temperature chamber. The icing process was simulated by dropping appropriate water on top of the device surface. Very clear and fast frequency response was observed from the proposed sensing device in the icing process, and also, the infuence of SiO2 guiding layer thickness on sensor response was also investigated.
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Zewu Zhang,Jinghui Zhang,Guangqing Liu,Mengwei Xue,Zhangzhong Wang,Xiaohai Bu,Qiong Wu,Xuejuan Zhao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
Au-Pt alloy nanoparticles that are selectively anchored on TiO2 surface of the ellipsoidal zirconium titanium composite oxides were successfully prepared by a facile two-step method: prefabricated binary composite oxides on the ellipsoidal Fe2O3@SiO2 by a versatile cooperative template-directed coating method, and then in situ formation of Au-Pt alloy NPs with Sn2+ as the reduction agent. The alloy catalysts were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The result suggested that highly dispersive and ultrafine Au-Pt alloy nanoparticles were deposited onto TiO2 surface of the binary oxides solely. The particle size of nanoalloys was closely related to the ratio of Zr : Ti in the composite oxides shell. Increasing the content of Zr element led to a growth in the size of alloy nanoparticles. When used as catalysts for the reduction of 4-nitrophenol, the prepared supported alloyed catalysts exhibited high catalytic activity, and the sample could be easily recycled without a significant decrease of the catalytic activity.
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