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In situ redox growth of mesoporous Pd-Cu2O nanoheterostructures for improved glucose oxidation electrocatalysis

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Science Bulletin 2019年第11期64卷 764-773页

作者： Ying Guo Jianwen Liu Yi-Tao Xu Bo Zhao Xuewan Wang Xian-Zhu Fu rong sun Ching-Ping Wong Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences. Shenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China National Supercomputing Center in Shenzhen Shenzhen 518055China Department of Electronics Engineering The Chinese University of Hong KongHong KongChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Interfaces of metal-oxide heterostructured electrocatalyst are critical to their catalytic activities due to the significant interfacial effects. However, there are still obscurities in the essence of interfacial effects caused by crystalline defects and mismatch of electronic structure at metal-oxide nanojunctions. To deeply understand the interfacial effects, we engineered crystalline-defect Pd-Cu2O interfaces through nonepitaxial growth by a facile redox route. The Pd-Cu2O nanoheterostructures exhibit much higher electrocatalytic activity toward glucose oxidation than their single counterparts and their physical mixture,which makes it have a promising potential for practical application of glucose *** study and density functional theory(DFT) calculations demonstrated that the interfacial electron accumulation and the shifting up of d bands center of Cu-Pd toward the Fermi level were responsible for excellent electrocatalytic activity. Further study found that Pd(3 1 0) facets exert a strong metaloxide interface interaction with Cu2O(1 1 1) facets due to their lattice mismatch. This leads to the sinking of O atoms and protruding of Cu atoms of Cu2O, and the Pd crystalline defects, further resulting in electron accumulation at the interface and the shifting up of d bands center of Cu-Pd, which is different from previously reported charge transfer between the interfaces. Our findings could contribute to design and development of advanced metal-oxide heterostructured electrocatalysts.

关键词： Metal-oxide interfaces Crystalline defects Interfacial electron accumulation Electrocatalysts Density functional theory

Theoretical research of isomerization mechanisms from cis to trans form in polyacetylene

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Chinese Journal of Chemistry 1986年第4期4卷 348-357页

作者： ZHAO Cheng-Da sun Yan WANG rong-sun Department of Chemistry, Northeast Normal University, Changchun Department of Chemistry Northeast Normal University Changchun

The characteristics of photo, thermal and doping isomerizations of polyacetylene werediscussed. A new biradical mechanism for photo and thermal isomerizations is proposed, which isconsistent with the ESR results. The CNDO/2 and INDO molecular orbital calculation results showthat the mechanism is energetically the most favorable. The reliability of applying general semi-empirical MO methods in polymers is estimated and showed to be valuable in predicting properties.

关键词： Theoretical research of isomerization mechanisms from cis to trans form in polyacetylene cis

Antiferromagnetic interlayer coupling of (111)-oriented La_(0.67)Sr_(0.33)MnO_3/SrRuO_3 superlattices

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Chinese Physics B 2019年第3期28卷 347-350页

作者： Hui Zhang Jing Zhang Jin-E Zhang Fu-rong Han Hai-Lin Huang Jing-Hua Song Bao-Gen Shen Ji-rong sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences

We report a strong antiferromagnetic(AFM) interlayer coupling in ferromagnetic La_(0.67)Sr_(0.33)MnO_3/SrRuO_3(LSMO/SRO) superlattices grown on(111)-oriented SrTiO_3 substrate. Unlike the(001) superlattices for which the spin alignment between LSMO and SRO is antiparallel in the in-plane direction and parallel in the out-of-plane direction, the antiparallel alignment is observed along both the in-plane and out-of-plane directions in the present sample. The low temperature hysteresis loop demonstrates two-step magnetic processes, indicating the coexistence of magnetically soft and hard components. Moreover, an inverted hysteresis loop was observed. Exchange bias tuned by the temperature and cooling field was also investigated, and positive as well as negative exchange bias was observed at the same temperature with the variation of the cooling field. A very large exchange field(H_(EB)) was observed and both magnitude and sign of the H_(EB)depend on the cooling field, which can be attributed to an interplay of Zeeman energy and AFM coupling energy at the interfaces. The present work shows the great potential of tuning a spin texture through interfacial engineering for the complex oxides whose spin state is jointly determined by strongly competing mechanisms.

关键词： transition metal oxide interlayer coupling exchange bias

Regulating the Electrical and Mechanical Properties of TaS_(2) Films via van der Waals and Electrostatic Interaction for High Performance Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第7期15卷 278-292页

作者： Fukang Deng Jianhong Wei Yadong Xu Zhiqiang Lin Xi Lu Yan-Jun Wan rong sun Ching-Ping Wong Yougen Hu Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Shenzhen Geim Graphene Center Institute of Materials ResearchShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Low-dimensional transition metal dichalcogenides(TMDs) have unique electronic structure, vibration modes, and physicochemical properties, making them suitable for fundamental studies and cutting-edge applications such as silicon electronics, optoelectronics, and bioelectronics. However, the brittleness, low toughness,and poor mechanical and electrical stabilities of TMD-based films limit their application. Herein, a TaS_(2) freestanding film with ultralow void ratio of 6.01% is restacked under the effect of bond-free van der Waals(vdW) interactions within the staggered 2H-TaS_(2) *** restacked films demonstrated an exceptionally high electrical conductivity of 2,666 S cm^(-1), electromagnetic interference shielding effectiveness(EMI SE) of 41.8 dB, and absolute EMI SE(SSE/t) of 27,859 dB cm^(2) g^(-1), which is the highest value reported for TMD-based materials. The bond-free vdW interactions between the adjacent 2H-TaS_(2) nanosheets provide a natural interfacial strain relaxation, achieving excellent flexibility without rupture after 1,000 bends. In addition, the TaS_(2) nanosheets are further combined with the polymer fibers of bacterial cellulose and aramid nanofibers via electrostatic interactions to significantly enhance the tensile strength and flexibility of the films while maintaining their high electrical conductivity and EMI *** work provides promising alternatives for conventional materials used in EMI shielding and nanodevices.

关键词： 2D transition metal dichalcogenides 2H-TaS_(2) Flexibility Electromagnetic interference shielding

SEQUENCE CONSERVATION OF HUMAN CYTOMEGALOVIRUS UL140 OPEN READING FRAME IN CLINICAL STRAINS

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Chinese Medical Sciences Journal 2008年第1期23卷 23-27页

作者： Ying Qi Yan-ping Ma rong He Zheng-rong sun Yao-hua Ji Yu-jing Huang Qiang Ruan Virus Laboratory Shengjing Hospital China Medical University Shenyang 110004

Objective To investigate the variability of human cytomegalovirus （HCMV） UL140 open reading flame （ORF） in clinical strains, and to explore the relationship between the variability of UL140 ORF and different symptoms of HC-MV infection. Methods HCMV UL140 ORF was amplified by polymerase chain reaction and sequenced selectedly in 30 clinical strains. Results UL140 ORF of all clinical strains was amplified successfully. Compared with that of Toledo strain, the nucleotide and amino acid sequence identities among all strains were 96.5% -100.0% and 95.2% -100. 0%, respectively. All of the nucleotide changes were substitutions. The post-translational modification sites were conserved. The result of phylogenetic tree showed that the strains did not cluster according to different clinical symptoms. Conclusion HCMV UL140 ORF in clinical strains is highly conserved, which may play an important role in HC-MV infection.

关键词： human cytomegalovirus UL140 conservation

Rat Models of Fatty Liver due to Liver Depression and Spleen Deficiency

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Medicinal Plant 2017年第5期8卷 34-39,44页

作者： Xiaoqian sun rong sun Shandong Academy of Chinese Medicine Shandong University of Traditional Chinese Medicine

[Objectives] To establish animal models of fatty liver due to liver depression and spleen deficiency that were suitable for activity discovery of traditional Chinese medicine( TCM) compounds,efficacy evaluation,new drug research and development and correspondence between prescription and syndrome of TCM. [Methods] A syndrome score scale that was suitable for evaluating the rat models was established according to the evolvement rules of etiology and pathogenesis of TCM and the modern clinical pathological mechanism. At the same time,bifendate pills and Sanqi Zhigan pills were selected as drug counterevidence for the models. Rats in model groups were given different proportions of high-fat and low-protein fodder and different concentrations of alcohol every day,and intraperitoneally injected with porcine serum twice a week. Drug groups were given with bifendate pills and Sanqi Zhigan pills( 8. 1 mg/kg,and 2. 7 g/kg) respectively for 14 consecutive *** the experiment,general status,weight,daily fodder intake and daily water intake of the animals were observed,and TCM syndromes were scored. After the experiment,the levels of alanine aminotransferase( ALT),aspartate aminotransferase( AST),γ-glutamine transpeptidase( γ-GT),total cholesterol( TC),triglycerides( TG),low density lipoprotein-cholesterol( LDL-C),and high density lipoprotein-cholesterol( HDL-C) in serum were detected,and the pathological changes in liver tissue were observed. [Results] Compared with the control group,body weight,daily fodder and water intake of rats increased slowly in the model group,and the levels of ALT,AST,γ-GT,TC,TG and LDL-C increased significantly,while the level of HDL-C dropped. Pathological examination showed that steatosis and fat granule were observed in hepatocytes of rats in the model group. Behavioral observation found that main symptoms and minor symptoms of rats in the model group conformed to the syndrome manifestation of liver depression and spleen deficiency,which su

关键词： Fatty liver Liver depression and spleen deficiency Animal model Rat

Even-odd harmonics generated from above-threshold ionization

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Frontiers of physics 2014年第1期9卷 69-73页

作者： Dong-Sheng Guo Jing-Tao Zhang Zhen-rong sun Jin T. Wang Ju Gao Zhi-Wei sun R. R. Freeman State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062 China Department of Physics Southern University Baton Rouge LA 70813 USA State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Jingpin Opto-Electronic Co. Jiangsu FOHO Science Park Fenhu Town Wujiang 215211 China Key Laboratory of Microgravity Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Department of Physics Ohio State University Columbus OH 43210 USA

We are reporting a theoretical prediction： The photoelectrons forming above-threshold-ionization （ATI） peaks emit both even and odd harmonics. These harmonics exhibit plateau and cut-off features similar to those o... 详细信息

关键词： strong-field laser physics above-threshold inoization high harmonic generation evenodd harmonics nonperturbative quantum electrodynamics

Effect of insulin and metformin on methylation and glycolipid metabolism of peroxisome proliferator-activated receptor γcoactivator-1A of rat offspring with gestational diabetes mellitus

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Asian Pacific Journal of Tropical Medicine 2016年第1期9卷 89-93页

作者： Ai-Qin Song Li-rong sun Yan-Xia Zhao Yan-Hua Gao Lei Chen Department of Pediatric Hematology Affiliated Hospital of Qingdao University

Objective:To discuss the effect of insulin and metformin on amethylation and glycolipid metabolism of peroxisome proliferator-activated receptor γ coactivator-1A(PPARGC1A) of rat offspring with gestational diabetes mellitus(GDM).Methods:A total of 45 pregnant rats received the intraperitoneal injection of streptozotocin to establish the pregnant rat model of GDM.A total of 21 pregnant rats with GDM were randomly divided into three groups,with 7ruts in each group,namely the insulin group,metformin group and control *** in the insulin group received the abdominal subcutaneous injection of 1 mL/kg recombinant insulin glargine at 18:00 every *** in the metformin group received the intragastric infusion of metformin hydrochloride at 18:00 every day,with the first dose of 300 mg/*** doses of two groups were adjusted every 3 d to maintain the blood glucose level at 2.65-7.62 mmol/*** in the control group received the intragastric infusion of 1 mL normal saline at 18:00 every *** the natural delivery of pregnant rats.10 offspring rats were randomly selected from each *** birth,4 wk and 8 wk after the birth of offspring rats,the weight of offspring rats was *** blood glucose level of offspring rats was measured at 4wk and 8 wk,while the level of serum insulin,triglyceride and leptin was measured at 8 ***:The weight of offspring rats at birth in the insulin group and metformin group was significantly lower than the one in the control group(P0.05).The fasting blood glucose and random blood glucose in the insulin group and metformin group at 4 wk and 8 wk were all significantly lower than ones in the control group(P0.05).The expression of PPARGC1 A mRNA in the insulin group and metformin group was significantly higher and the methylation level of PPARGC1 A was

关键词： Insulin Metformin Gestational diabetes mellitus Peroxisome proliferator-activated receptor γ coactivator-1 A Methylation Glycolipid metabolism

A Note on Adjacent Strong Edge Coloring of K(n,m)

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Acta Mathematicae Applicatae Sinica 2006年第2期22卷 273-276页

作者： Jing-wen Li Zhong-fu Zhang Xiang-en Chen Yi-rong sun College of Information and Electrical Engineering Lanzhou Jiaotong University Lanzhou 730070 China Institutc of Applied Mathematics Lanzhou Jiaotong University Lanzhou 730070 China College of Mathematics and Information Science Northwest Normal University Lanzhou 730070 China

In this paper, we prove that the adjacent strong edge chromatic number of a graph K（n,m） is n ＋ 1, with n ≥ 2, m ≥ 1.

关键词： Coloring edge coloring adjacent strong edge coloring