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Graphene Aerogel Composites with Self‑Organized Nanowires‑Packed Honeycomb Structure for highly Efficient Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 533-547页

作者： Xiao You Huiying Ouyang Ruixiang Deng Qiuqi Zhang Zhenzhong Xing Xiaowu Chen Qingliang Shan Jinshan Yang Shaoming Dong state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China key laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Structural ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210People’s Republic of China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China University of Chinese Academy of Sciences Beijing 100039People’s Republic of China

With vigorous developments in nanotechnology,the elaborate regulation of microstructure shows attractive potential in the design of electromagnetic wave ***,a hierarchical porous structure and composite heterogeneous interface are constructed successfully to optimize the electromagnetic loss *** macro–micro-synergistic graphene aerogel formed by the ice template‑assisted 3D printing strategy is cut by silicon carbide nanowires(SiC_(nws))grown in situ,while boron nitride(BN)interfacial structure is introduced on graphene *** unique composite structure forces multiple scattering of incident EMWs,ensuring the combined effects of interfacial polarization,conduction networks,and magnetic-dielectric ***,the as-prepared composites present a minimum reflection loss value of−37.8 dB and a wide effective absorption bandwidth(EAB)of 9.2 GHz(from 8.8 to 18.0 GHz)at 2.5 ***,relying on the intrinsic high-temperature resistance of SiC_(nws) and BN,the EAB also remains above 5.0 GHz after annealing in air environment at 600℃ for 10 h.

关键词： Hierarchical porous structure Interface high-temperature resistance Graphene aerogel composites Electromagnetic wave absorption

Enhancement of photocatalytic efficiency by in situ fabrication of BiOBr/BiVO_4 surface junctions

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Journal of Environmental Sciences 2017年第10期29卷 78-83页

作者： Wenzong Yin Xiang Sun Wenzhong Wang state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

Surface junctions between Bi OBr and BiVO4 were synthesized. The BiOBr/BiVO4 with 1 wt.%of Bi OBr exhibited the highest photocatalytic activity in the degradation of Rh B under visible-light irradiation. It was found that the highly efficient adsorption of Rh B molecules via the electrostatic attraction between Br-and cationic ／N（Et）2 group played a key role for the high photocatalytic activities of BiOBr/BiVO4. This efficient adsorption promoted the N-deethylation of Rh B and thus accelerated the photocatalytic degradation of Rh ***, the metal-to-metal charge transfer（MMCT） mechanism was proposed, which revealed the concrete path paved with Bi–O–Bi chains for the carrier migration in BiOBr/BiVO4. The interaction between photoexcited Rh B＊ and the Bi^（3＋） in BiVO4 provided the driving force for the migration of photo-generated carriers along the Bi–O–Bi chains. This work has not only demonstrated the important role of efficient adsorption in the photocatalytic degradation of organic contaminants, but also developed a facile strategy to improve the efficiency of photocatalysts.

关键词： Surface junction Photocatalysis N-deethylation Adsorption efficiency Redox potential

Sintering kinetics of YAG ceramics

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Journal of Rare Earths 2014年第5期32卷 416-422页

作者：黄毅华江东亮张景贤陈忠明林庆玲黄政仁 The state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of CeramicsChinese Academy of Sciences

Solid state reactive （SSR） sintering kinetics was observed for YAG ceramics. There were two densification stages in sin- tering process due to its reaction. After the first stage, samples began to expand, then, the second densification stage began. At a heat- ing rate of 10 ℃/min, the sample warped down and warped back to straight. The apparent activation energy of the first densification process was about 522 kJ/mol for the initial shrinkage of A1203 and Y203 mixed powder green-body, which increased in the follow- ing process due to the solid state reaction. In the second densification stage, synthesis reaction of YAG still worked. Green-bodies processed with higher heating rate got more shrinkage at the same temperature than lower heating rate green bodies. And its kinetic field diagram was abnormal, compared with that of other reported ceramics, such as Al203. It was found that the reaction of YAG provided positive effect to the sintering driving force. The apparent activation energy for densification of SSR YAG sintered in ArH5 atmosphere was 855 kJ/mol at temperature holding sintering. And the apparent activation energy for grain growth was 1053 kJ/mol.

关键词： YAG sintering kinetic field solid state reaction rare earths

Sintering of transparent Nd:YAG ceramics in oxygen atmosphere

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Journal of Rare Earths 2013年第2期31卷 153-157页

作者：黄毅华江东亮张景贤林庆玲黄政仁 The state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of CeramicsChinese Academy of Sciences

Yttrium aluminum garnet （YAG） transparent ceramics were fabricated by sintering at oxygen atmosphere. Tetraethyl orthosilicate （TEOS） was added as the sintering additive to control the grain growth and densification. Pores were eliminated clearly at temperature lower than 1700oC, while grain size was around 3 μm. The in-line transmittance was 80% at 1064 nm when samples were sintered at 1710oC. The effect of TEOS was studied in oxygen atmosphere sintering for Nd：YAG transparent ceramics. At higher temperature like 1710oC, the grain growth mechanism was solute drag, while at 1630 and 1550 oC the grain growth was controlled by liquid phase sintering mechanism. And 0.5 wt.% TEOS was the best adding content for Nd：YAG sintered in oxygen atmosphere.

关键词： transparent ceramics YAG oxygen atmosphere sintering rare earths

Correlation between lithium storage and diffusion properties and electrochromic characteristics of WO_3 thin films

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Chinese Physics B 2013年第3期22卷 512-516页

作者：于鹏飞崔忠慧范武刚郭向欣 state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

As essential electrochromic（EC） materials are related to energy savings in fenestration technology,tungsten oxide（WO3） films have been intensively studied *** order to achieve better understanding of the mechanism of EC properties,and thus facilitate optimization of device performance,clarification of the correlation between cation storage and transfer properties and the coloration performance is *** this study,transparent polycrystalline and amorphous WO3 thin films were deposited on SnO2：F-coated glass substrates by the pulsed laser deposition *** into optical transmittance in a wavelength range of 400-800 nm measured at a current density of 130 μA·cm-2 with the applied potential ranging from 3.2 to 2.2 V indicates that polycrystalline films have a larger optical modulation of ～ 30% at 600 nm and a larger coloration switch time of 95 s in the whole wavelength range compared with amorphous films（～ 24% and 50 s）.Meanwhile,under the same conditions,polycrystalline films show a larger lithium storage capacity corresponding to a Li/W ratio of 0.5,a smaller lithium diffusion coefficient（2×10-12cm2·s-1 for Li/W=0.24） compared with the amorphous ones,which have a Li/W ratio of 0.29 and a coefficient of ～2.5×10-11cm2·s-1 as Li/W=*** results demonstrate that the large optical modulation relates to the large lithium storage capacity,and the fast coloration transition is associated with fast lithium diffusion.

关键词： WO3 thin films electrochromic material lithium storage and diffusion

Recent progresses in the phenomenological description for the indentation size effect in microhardness testing of brittle ceramics

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Journal of Advanced ceramics 2012年第1期1卷 38-49页

作者： Danyu JIANG state key laboratory of high performance ceramics and superfine microstructure Shanghai Institute of CeramicsShanghai 200050China

The indentation hardness of a given material is usually load-dependent and such a phenomenon is generally referred to as the indentation size effect(ISE).The existence of ISE means that,if hardness is used as a material selection criterion,it is clearly insufficient to quote a single hardness *** empirical or semi-empirical equations,including the Meyer’s law,the Hays-Kendall approach,the energy-balance approach,the proportional specimen resistance(PSR)model and the modified PSR model,etc.,have been proposed for the description of the variation of the indentation size with the applied test load and for determining the so-called load-independent *** paper reviews these existing empirical equations,with a special emphasis on the analysis and the application of the modified PSR model.

关键词： indentation hardness size effect residual stress

Blue-shift of Nano-Y_2O_3 : Eu^(3+) Emission Spectra Excited by X-ray

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Journal of Materials Science & Technology 1997年第4期13卷 351-353页

作者： Qiang LI Lian GAO and Dongsheng YAN(state key lab. of high performance ceramics & superfine microstructure, Shanghai Institute of ceramics,Chinese Academy of Sciences, Shanghai 200050, China) state key lab. of high performance ceramics and superfine microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

Nano-Y_2O_3:Eu^(3+) powder was prepared by the homogeneous precipitation. With controlling the conditions of the reaction, nano powders with different grain size were obtained. It is found that the blue-shift phenomena exist in the nano-Y2O3:Eu3+ emission spectra excited by X-ray. The wave lengths of the peak (5D0→7F2) are related with the grain size of the powder

关键词： Eu Nano Emission Spectra Excited by X-ray Blue-shift of Nano-Y2O3

Preparation and Properties of Nano-TiO_2 Powders

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Journal of Materials Science & Technology 1997年第4期13卷 321-323页

作者： Zhe SONG Qing LI and Lian GAO(state key lab. of high performance ceramics & superfine microstructure, Shanghai Institute of ceramics,Chinese Acadmey of Sciences, Shanghai 200050, China) state key lab. of high performance ceramics and superfine microstructure Shanghai Institute of Ceramics Chinese Acadmey of Sciences Shanghai 200050 China

This paper reports the preparation of nano-TiO2 (about 10 nm) powder by the method of precipitation. In detail, some breparation conditions were investigated in order to find out how to control the grain size and reduce the agglomeration of powders. Also, the reflex spectra of nano-scale powders with different grain size were studied. It tvas found that the wave length and width of reflex spectra are connected with the grain size of nano-TiO2 powders

关键词： TiO Nano Preparation and Properties of Nano-TiO2 Powders OC

Simultaneous Al2O3 Doping and Sulfation in Hierarchically Porous ZrO2 Solid Acids by an One-pot Synthesis for Enhanced Recycling Catalytic performances

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Chinese Journal of Chemistry 2011年第3期29卷 483-488页

作者： Wang, Nan Chen, Yu Ye, Zhengqing Chen, Hangrong Shi, Jianlin state key lab of high performance ceramics and superfine microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

Alumina doping and sulfation in hierarchically porous zirconia solid acids have been achieved simultaneously via one-pot and bi-surfactant-assisted self-assembly process, using aluminum sulfate as both Al and SO^2- sources. The prepared composite solid acids showed much enhanced acidity and recycling catalytic activity for an esterification reaction compared with sulfated zirconia without alumina doping and Al-doped sulfated zirconia without hierarchically porous structure.

关键词： one-pot synthesis doping Al-promoted sulfated zirconia hierarchical porous structure material science self-assembly