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Magnetic properties and magnetoresistance of Co_xC_(1-x) granular films prepared by magnetron sputtering

Science China(Physics,Mechanics & Astronomy) 2011年第7期54卷 1218-1222页

作者： MA Lei LIU ZhongWu ZENG DeChang ZHONG XiaPing ZHANG XiaoZhong School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China department of matertals sctence and engtneermg Tsinghua University Beijing 100084 China

Amorphous CoxC1-x granular films were prepared on n-Si（100） substrate by dc magnetron sputtering. The effects of Co con- centration, film thickness and annealing temperature on the magnetic properties and magnetoresistance （MR） were investigated After annealing at 500℃ for 0.5 hour, the Co（002） peak of the CoxC1-x（x〉2.5 at.%） films was observed, but cracks appeared in the films. Saturation magnetization Ms increased steadily with the increase of Co concentration from 2.5 at.% to 50 at.% and also increased with annealing temperature from room temperature to 400℃. The coercivity of CoxC1-x films was less than 180 Oe. The as-deposited Co2.5C97.5 granular films with 80 nm thickness showed a highly positive MR, up to 15.5% at a magnetic field of 0.8 T, observed at T=300 K when the external magnetic field was perpendicular to the film surface. With increasing film thickness and annealing temperature, the value of MR was found to decrease gradually and changed from positive to neg- ative. The MR effect of the CoxC1-x granular films can be explained by p-n heterojunction theory and interface scattering ef- fect.

关键词： Co-C films granular films magnetoresistance magnetron sputtering

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Polymeric Carbon Nitride-based Single Atom Photocatalysts for CO_(2) Reduction to C1 Products

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Chemical Research in Chinese Universities 2022年第5期38卷 1197-1206页

作者： MIAO Tianchang DI Xin HAO Feini ZHENG Gengfeng HAN Qing Key Laboratory of Cluster Science Key Laboratory of Photoelectronic/Electrophotonic Conversion MatertalsMinistry of EductionSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081P.R.China Laboratory of Advanced Materials Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysts and InnovationFudan UniversityShanghai 200438P.R.China

Photocatalytic CO_(2)reduction to C1 fuels is considered to be an important way for alleviating increasingly serious energy crisis and environmental *** to the environment-friendly,simple preparation,easy formation of highly-stable metal-nitrogen(M-Nx)coordination bonds,and suitable band structure,polymeric carbon nitride-based single-atom catalysts(C_(3)N_(4)-based SACs)are expected to become a potential for CO_(2)reduction under visible-light *** this review,we summarize the recent advancement on C_(3)N_(4)-based SACs for photocatalytic CO_(2)reduction to C1 products,including the reaction mechanism for photocatalytic CO_(2)reduction to C1 products,the structure and synthesis methods of C_(3)N_(4)-based SACs and their applications toward photocatalytic CO_(2)reduction reaction(CO_(2)RR)for C1 *** current challenges and future opportunities of C_(3)N_(4)-based SACs for photoreduction of CO_(2)are also discussed.

关键词： Photocatalytic CO_(2)reduction Polymeric carbon nitride Polymeric carbon nitride-based single-atom catalyst C1 product

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Flame retarded polymer nanocomposites: Development,trend and future perspective

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Science China Chemistry 2011年第2期54卷 302-313页

作者： MA HaiYun SONG PingAn FANG ZhengPing MOE Key Laboratory of Macromolecular Synthesis and Functionalization Institute of Polymer Composites Zhejiang University Hangzhou 310027 China Laboratory of Polymer matertals and Engmeering Nmgbo lnstttute of Technology Zhejiang University Ningbo 315100 China department of Biological and Materials Science University of Michigan Ann Arbor 48109 USA

Polymer nanocomposites are a new class of flame retarded materials which have attracted much attention and considered as a revolutionary new flame retardant approach.A very small amount of nano flame retardants (normally < 5 wt%) can significantly reduce the heat release rate (HRR) and smoke emission (SEA) during the combustion of polymer ***,the addition of nano flame retardants can also improve the mechanical properties of polymer materials compared with the deterioration of traditional flame *** paper reviews the recent development in the flame retardant field of polymer nanocomposites and also introduces the related research in our *** challenges and problems are discussed and the future development of flame retarded polymer nanocomposites is prospected.

关键词： nanocomposite layered silicate carbon nanotubes fullerene flame retardancy

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Effect of beta-tricalcium phosphate/poly-1-lactide composites on radial bone defects of rabbit

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Asian Pacific Journal of Tropical Medicine 2013年第9期6卷 753-756页

作者： Zhao-Jin Zhu Hao Shen Yong-Ping Wang Yao Jiang Xian-Long Zhang Guang-Yin Yuan Medical Board of Graduate School of Suzhou University Orthopedic Surgery of 6th People-s Hospital affiliated to Shanghai Jiaotong University Orthopaedic department First Hospital of Lanzhou University Materials Science and Engineering Institute of Light Alloy Precision Forming National Engineering Research Center of Shanghai Jiaotong University

Objective:To explore the effect ofβ-TCP/PLLA scaffold in repairing rabbit radial lone ***:Thirty New Zealand rabbits were divided intoβ-TCP/PLLA group(group A),pure PLLA group(group B)and contrast group(group C)*** rabbits were sacrificed respectively after 4.8.12,24 weeks and the X-ray film was performed at the same time to evaluate the repair effect in different ***:X-ray film showed there was uneven low density bone callus development in defect region after 4 weeks in group *** defect region was filled with neonate osseous tissue completely during 12-24 weeks.X-ray score revealed that repair of bone defect results significantly better than group B and group ***:Theβ-PCP/PLLA composite is capable of repairing radial lone lone defects.β-TCP/PLLA scaffold is significant because of rapid degradation ability,good histocompatihility and osteogenic action.

关键词： β-TCP/PLLA Large segment of simulated-bioactive bone substitute Bone defect

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