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Design and calculation of low infrared transmittance and low emissivity coatings for heat radiative applications

International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 179-184页

作者： Cruang-hai Wang Yue Zhang Da-hai Zhang Jin-peng Fan School of Materials Science and Engineering Beihang University Beijing 100191 China National Defence Science ＆ Technology Key Laboratory of Advanced Functional Composites Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

The infrared transmittance and emissivity of heat-insulating coatings pigmented with various structural particles were studied using Kubelka-Munk theory and Mie theory. The primary design purpose was to obtain the low transmittance and low emissivity coatings to reduce the heat transfer by thermal radiation for high-temperature applications. In the case of silica coating layers constituted with various structural titania particles （solid, hollow, and core-shell spherical）, the dependence of transmittance and emissivity of the coating layer on the particle structure and the layer thickness was investigated and optimized. The results indicate that the coating pigmented with core-shell titania particles exhibits a lower infrared transmittance and a lower emissivity value than that with other structural particles and is suitable to radiative heat-insulating applications.

关键词： scattering pigments coatings transmittance emissivity

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An Aggregation‐Induced‐Emission Platform for Direct Visualization of Interfacial Dynamic Self‐Assembly†

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Angewandte Chemie 2014年第49期126卷

作者： Junwei Li Yuan Li Carrie Y. K. Chan Ryan T. K. Kwok Hongkun Li Pavel Zrazhevskiy Xiaohu Gao Jing Zhi Sun Anjun Qin Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 (China) Department of Bioengineering University of Washington Seattle WA (USA) Physics Department Wake Forest University Winston‐Salem NC 27106 (USA) Department of Chemistry Institute for Advanced Study Institute of Molecular Functional Materials and State Key Laboratory of Molecular Neuroscience The Hong Kong University of Science & Technology Clear Water Bay Kowloon Hong Kong (China) State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 (China)

An in‐depth understanding of dynamic interfacial self‐assembly processes is essential for a wide range of topics in theoretical physics, materials design, and biomedical research. However, direct monitoring of such processes is hampered by the poor imaging contrast of a thin interfacial layer. We report in situ imaging technology capable of selectively highlighting self‐assembly at the phase boundary in real time by employing the unique photophysical properties of aggregation‐induced emission. Its application to the study of breath‐figure formation, an immensely useful yet poorly understood phenomenon, provided a mechanistic model supported by direct visualization of all main steps and fully corroborated by simulation and theoretical analysis. This platform is expected to advance the understanding of the dynamic phase‐transition phenomena, offer insights into interfacial biological processes, and guide development of novel self‐assembly technologies.

关键词： Aggregationsinduzierte Emission Fluoreszenz Grenzflächen Kondensationsmuster Tetraphenylethen

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Probing the generalized magicity of Ag nanoclusters constructed on Si(111) by atomic manipulation

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Physical Review B 2013年第12期88卷 125432-125432页

作者： Fangfei Ming Guohua Zhong Qin Liu Kedong Wang Zhenyu Zhang Xudong Xiao Department of Physics The Chinese University of Hong Kong Shatin New Territory Hong Kong China Shenzhen Institute of Advanced Technology Chinese Academy of Science Shenzhen China International Center for Quantum Design of Functional Materials (ICQD) Hefei National Laboratory for Physical Sciences at Microscales University of Science and Technology of China Hefei Anhui 230026 China

Using scanning tunneling microscopy supplemented with first-principles calculations, we examine all the thermally activated atomistic processes of Agn (n = 1–26) constructed atom-by-atom on a Si(111)-(7×7) substrate, and we exploit such cluster dynamical information to further determine the energetic stability (or magicity) of the clusters. By generalizing the traditional concept of cluster magicity solely based on cluster association/dissociation to also include various complex collective cluster motions, we identify the existence of two classes of magic clusters. The most stable class, Ag10 and Ag25, is defined by geometrical shell closure; the less stable class of Agn (n = 3, 5, 13, 16, 19) is associated with lower kinetic barriers against internal restructuring of, or atom detachment from, their respective clusters of neighboring sizes. Our detailed analysis also reveals that the substrate effect, rather than the number of bonds within the clusters, dominates the cluster stabilities. The conceptual advances gained in the present study are broadly applicable to many related cluster systems in contact with external media, and they are expected to be instrumental in tuning the dynamical behaviors of clusters in surface catalysis, nanoplasmonics, and other technological areas.

关键词： SILVER ATOMS ATOMIC clusters SILICON NANOSILICON

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Strong Electron Acceptor Additive for Achieving Efficient Polymer Solar Cells with P3HT∶ PCBM films by a Quick Drying Process

Strong Electron Acceptor Additive for Achieving Efficient Po...

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第八届全国暨华人有机分子和聚合物发光与光电特性学术会议

作者： Aiyuan Li Xinrui Miao Xianyu Deng Research Center for Advanced Functional Materials and Devices Shenzhen Engineering Lab of Flexible Transparent Conductive Films Shenzhen Key Laboratory of Advanced Materials School of Materials Science and Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 P.R.China College of Materials Science and Engineering South China University of Technology Guangzhou 510640

Traditional P3HT∶ PCBM based polymer solar cells need solvent annealing treatment to guarantee the optimal *** will enhance the fabrication time and not suitable to future roll-to-roll process.

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Tuning two-dimensional band structure of Cu(111) surface-state electrons that interplay with artificial supramolecular architectures

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Physical Review B 2013年第24期88卷 245430-245430页

作者： Shiyong Wang Weihua Wang Liang Z. Tan Xing Guang Li Zilang Shi Guowen Kuang Pei Nian Liu Steven G. Louie Nian Lin Department of Physics The Hong Kong University of Science and Technology Hong Kong China Department of Physics University of California Berkeley CA 94720-7300 USA and Material Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Shanghai Key Laboratory of Functional Materials Chemistry and Institute of Fine Chemicals East China University of Science and Technology Meilong Road 130 Shanghai China Institute for Advanced Study Hong Kong University of Science and Technology Hong Kong China

We report on the modulation of two-dimensional (2D) bands of Cu(111) surface-state electrons by three isostructural supramolecular honeycomb architectures with different periodicity or constituent molecules. Using Fourier-transformed scanning tunneling spectroscopy and model calculations, we resolved the 2D band structures and found that the intrinsic surface-state band is split into discrete bands. The band characteristics including band gap, band bottom, and bandwidth are controlled by the network unit cell size and the nature of the molecule-surface interaction. In particular, Dirac cones emerge where the second and third bands meet at the K points of the Brillouin zone of the supramolecular lattice.

关键词： ELECTRICAL properties of copper ENERGY bands TUNING (Electronics) SURFACE states HONEYCOMB structures CALCULATIONS & mathematical techniques in atomic physics SCANNING tunneling microscopy

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High-performance fuel electrodes based on NbTi0.5M 0.5O4 (M = Ni, Cu) with reversible exsolution of the nano-catalyst for steam electrolysis

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Journal of Materials Chemistry C 2013年第31期1卷 8984-8993页

作者： Li, Shisong Qin, Qingqing Xie, Kui Wang, Yan Wu, Yucheng Department of Energy Materials School of Materials Science and Engineering Hefei University of Technology No. 193 Tunxi Road Hefei Anhui 230009 China Key Laboratory of Advanced Functional Materials and Devices School of Materials Science and Engineering Hefei University of Technology No. 193 Tunxi Road Hefei Anhui 230009 China

This paper investigates potential fuel electrode materials NbTi 0.5M0.5O4 (M = Ni, Cu) for solid oxide steam electrolysers. Efficient catalytic metallic Ni and Cu nanoparticles are exsolved and anchor onto the surface of the highly electronically conducting material Nb1.33Ti0.67O4, forming an enhanced composite fuel electrode in the in situ reduction. The XRD, SEM, EDS and XPS results together confirm that the exsolution or dissolution of the nanometallic catalyst is completely reversible in the redox cycles. The electrical properties of the reduced NbTi0.5M0.5O4 ceramic fuel electrode is systematically investigated and correlated to the electrochemical performance of the composite fuel electrodes in symmetric cells or electrolysis cells. The synergetic effect of the metallic catalyst and ceramic fuel electrode leads to the excellent stability as well as the superior performance of the direct steam electrolysis without a flow of reducing gas over the composite fuel electrodes. The Faradic efficiencies of the steam electrolysis reach 95% and 97% for the Ni- and Cu-enhanced fuel electrodes on flowing reducing gas over the fuel electrodes, respectively, however, comparable performance is achieved for the direct steam electrolysis with Ni- and Cu-enhanced fuel electrodes without flowing reducing gas over the composite fuel electrodes. © 2013 The Royal Society of Chemistry.

关键词： Nanocatalysts

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Crystal structure determination of nanolaminated Ti_(5)Al_(2)C_(3) by combined techniques of XRPD,TEM and ab initio calculations

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Journal of advanced Ceramics 2012年第4期1卷 268-273页

作者： Hui ZHANG Xiaohui WANG Yonghui MA Luchao SUN Liya ZHENG Yanchun ZHOU Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China Graduate School of Chinese Academy of Sciences Beijing 100039China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyNo.1 South Dahongmen RoadBeijing 100076China

Crystal structure of Ti_(5)Al_(2)C_(3)was determined by means of X-ray powder diffraction(XRPD),transmission electron microscopy(TEM)and ab initio *** contrast to the already known P63/mmc space group that the MAX phases crystallize,it was demonstrated that the R3_m space group could better satisfy the experimental *** lattice parameters are a=0.30564 nm,c=4.81846 nm in a hexagonal unit cell.

关键词： Ti_(5)Al_(2)C_(3) crystal structure layered carbides transmission electron microscopy(TEM)

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Synthesis, properties, and mechanism of two novel photoisomerization pyrazolones in the solid state

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Journal of Molecular Structure 2013年 1035卷 271-276页

作者： Mingxi Guo Jixi Guo Dianzeng Jia Hu Liu Lang Liu Anjie Liu Feng Li Key Laboratory of Material and Technology for Clean Energy Ministry of Education Key Laboratory of Advanced Functional Materials Autonomous Region Institute of Applied Chemistry Xinjiang University Urumqi 830046 Xinjiang PR China State Laboratory of Surface and Interface Science and Technology School of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 Henan PR China University of Texas M.D. Anderson Cancer Center Houston TX 77002 USA

Two novel photoisomerization compounds derived from pyrazolones have been synthesized successfully. The photoisomerization properties of materials have been carefully investigated by measuring the UV–vis absorption and fluorescence spectra of the materials. It was found for the first time among the derivatives of pyrazolones that the compounds change their color from yellow to brown with an efficiency of more than 95% of modulating the fluorescence behaviors, after irradiated with visible light. The unique fluorescent changes of the two compounds between their “on” and “off” states in the solid state indicate that the materials could be used as building blocks to construct novel optical switches. The mechanism of the photoisomerization was further studied with FT-IR, XPS and X-ray single crystal diffraction. The photoreaction resulted from isomerization between the enol and keto forms of the materials is accompanied by intra- and inter-molecular proton transfer.

关键词： Pyrazolone Photoisomerization Fluorescence modulation Optical switch Proton transfer Hydrogen bond

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Chemiluminescence: Red-Emissive Chemiluminescent Nanoparticles with Aggregation-Induced Emission Characteristics for In Vivo Hydrogen Peroxide Imaging (Part. Part. Syst. Charact. 12/2014)

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Particle & Particle Systems Characterization 2014年第12期31卷

作者： Junlong Geng Kai Li Wei Qin Ben Zhong Tang Bin Liu Department of Chemical and Biomolecular Engineering National University of Singapore 117585 Singapore Institute of Materials Research Engineering 3 Research Link 117602 Singapore Department of Chemistry Institute for Advanced Study Division of Biomedical Engineering State Key Laboratory of Molecular Neuroscience and Institute of Molecular Functional Materials The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China SCUT-HKUST Joint Research Laboratory Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

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Evaluation of thermal conductivity of insulation materials at high-temperature for longtime

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2013年第SUPPL.期30卷 279-282页

作者： Yang, Jingxing He, Fengmei Chen, Conghui Li, Qi Yu, Fan Yang, Hailong Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China

In order to research the effect of endothermic and exothermic processes on thermal parameters of the insulation materials under high temperature and long time, the high-temperature thermal conductivity measuring of two thermal insulation materials has been investigated by plane source-stepwise transient method in this paper. The thermal conductivity, diffusivity and capacity values of two materials at high-temperature for longtime have been obtained. The results showed that, insulation materials might also be accompanied by endothermic and exothermic processes under high-temperature and long-term, and heat insulation performance of the material will change. These processes could be responded by thermal conductivity measuring.

关键词： Thermal conductivity

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