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RISS 인기검색어
- 검색키워드
- 저자 : Hanxing Liu (검색결과 4 건)
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Preparation and property of submicrometre-crystalline Ba0.67Sr0.33TiO3 powders and ceramics
Hanxing Liu,Jing Xu,Bo He,Yiqiu Li,Minghe Cao,Hua Hao,Zhiyong Yu 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Submicrometre-particulate pure Ba0.67Sr0.33TiO3 (BST) powders approximately 110 nm in size have been prepared by a solidstate reaction technique. BST ceramics derived from powder calcined at different temperatures were fabricated with various sintering conditions. High-density BST ceramics at all sintering temperatures were obtained at a calcination temperature of 950 oC with the highest 99.6% of the theoretical density. Calcining at 950 oC and sintering at 1300 oC for 2 h , BST ceramic samples with an average grain size about 250 nm were obtained, showing satisfying dielectric properties and ferroelectric properties, with high permittivity εr = 7676, low loss factor tanδ = 0.01 and remanent polarization Pr = 9.2 μC/cm2, coercive electric field Ec = 1.58 kV/cm at room temperature.
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Hanxing He,Gefei Li,Jiantao Zhang,Jinlong Zhang,Mingyue Luo,Wenkai Hu,Yamin Lin,Ziyu Deng,Zhicheng Liu,Weizhao Chen,Xu Deng 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
A genetic approach was proposed to modify the characteristics of Bacillus subtilis strain WB800 (B. subtilis WB800) for selfhealing of concrete cracks. Three genes, namely gerAa which encodes germination receptors activated by L-alanine, tupA which is responsible for the synthesis of teichuronopeptide, and ca which encodes carbonic anhydrase (CA) catalyzing the synthesis of carbonate ion, were separately transformed into WB800. To protect bacterial cells from being squeezed, microspheres were produced with microcrystal cellulose (MCC) before the introduction of bacteria into the specimens. The results showed that the modified B. subtilis expressing GerA achieved 39.9% of germination ratio compared to 17% by the original host cells. With the transformation of tupA, the modified strain demonstrated higher resistance to alkaline environments, tolerating pH as high as 11, while the original strain only tolerated pH 9. The modified strain expressing CA induced more calcium carbonate than the original cells. Energy dispersive spectroscopy (EDS) identified the produced precipitate to be calcite (CaCO3). Moreover, a mathematical model was developed to optimize the influential factors of calcium precipitation process. Finally, based on the above results, an effective self-healing of concrete crack was achieved. This study may provide a promising strategy to improve the efficiency of bacterial self-healing of concrete cracks.
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Effect of SiO2 additives on the microstructure and energy storage density of SrTiO3 ceramics
Guanghui Zhao,Yiqiu Li,Hanxing Liu,Jing Xu,Hua Hao,Minghe Cao,Zhiyong Yu 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.3
The compositions of (1-x) SrTiO3-x SiO2 were prepared by a solid-state reaction. The crystalline structure, microstructure and energy storage performance were studied for the purpose of a potential application in high energy density capacitors. Fine grains with an average size of about 400 nm were obtained by adding SiO2 to SrTiO3 ceramics, which leads to a great enhancement in the breakdown performance of the samples. For SiO2-added samples, the notable increase in breakdown strength makes an obvious increase in energy storage density. With 15 vol.% addition, the sample exhibited an average breakdown strength of 36.1 kV/mm, and an energy storage density of 1.155 J/cm3.
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Synthesis and characterization of Ba(TI1-xZRx)O₃ nanopowders by an aqueous coprecipitation method
Xiangbang Cheng,Zhuo Li,Zhonghua Yao,Yang Liu,Zhiyong Yu,Minghe Cao,Hanxing Liu 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6
In this study, single phase Ba(Ti1-xZrx)O3 (0 ≤ × ≤ 0.15) nanopowders have been synthesized successfully by an aqueous coprecipitation method at 85 oC without any further heat treatment. The lattice strain calculated by the Hall-Williamson method indicates that the broadening of the XRD peaks is primarily due to the size of particles not to the lattice strain. The increase of the lattice parameter indicates that Zr ions have entered the lattice and a solid solution was successfully obtained. Furthermore, the particle sizes calculated by the Sherrer formula from the XRD patterns are in agreement with the results of SEM and TEM images. The nanopowders obtained can be used to prepare Ba(Ti1-xZrx)O3 ceramics with a tailored grain size and homogeneous composition, and this is significant to investigate the size effect in Ba(Ti1-xZrx)O3 ceramics and understand the relaxor behavior thoroughly. In this study, single phase Ba(Ti1-xZrx)O3 (0 ≤ × ≤ 0.15) nanopowders have been synthesized successfully by an aqueous coprecipitation method at 85 oC without any further heat treatment. The lattice strain calculated by the Hall-Williamson method indicates that the broadening of the XRD peaks is primarily due to the size of particles not to the lattice strain. The increase of the lattice parameter indicates that Zr ions have entered the lattice and a solid solution was successfully obtained. Furthermore, the particle sizes calculated by the Sherrer formula from the XRD patterns are in agreement with the results of SEM and TEM images. The nanopowders obtained can be used to prepare Ba(Ti1-xZrx)O3 ceramics with a tailored grain size and homogeneous composition, and this is significant to investigate the size effect in Ba(Ti1-xZrx)O3 ceramics and understand the relaxor behavior thoroughly.
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