检索结果-内蒙古大学图书馆

Novel in-situ nanocomposites of phthalonitrile end-capped polyarylene ether nitrile/copper phthalocyanine

AIP Conference Proceedings 2017年第1期1794卷

作者： Lifen Tong Renbo Wei Xiaobo Liu Research Branch of Advanced Functional Materials School of Microelectronic & Solid State Electronic High-temperature Resistant Polymers and Composites Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu 610054 P. R. China

A novel phthalonitrile end-capped polyarylene ether nitrile (PEN-Ph)/copper phthalocyanine (CuPc) nanocomposites which possesses crosslinking reaction combined with crystallization behaviour were prepared successfully through in-situ reaction and hot-compression. In the presence of copper ion, CuPc were formed through crosslinking reaction among the phthalonitrile at the end of the PEN-Ph main chain and 1, 3, 5-Tri-(3, 4-dicyanophenoxy) benzene (TPh). Besides, the formed CuPc can play the role of nucleating agent to improve the crystallinity of the polymers. The influence of the crosslinking reaction and crystallization behaviour were investigated. The results show that the crystallization and crosslinking coexist in the system at the same time. Scanning electron microscope (SEM) images show that the crystals of the PEN-Ph grow after the hot-compressing procedure. Moreover, the glass transition temperature (Tg) increases while the crystallinity declines slightly with the low amount of copper ions. The increase of Tg is mainly caused by the crosslinking reaction, indicating that the copper can be used as a crosslinking agent in this system. Due to formation of the CuPc and the crystallization behaviour, the dielectric constant increased as expected from 3.2 to 4.9 while the dielectric loss decreased. Therefore, the PEN-Ph/CuPc in-situ nanocomposites will have a good prospect for application in electronic field.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Catalytic Activity of Iridium Dioxide With Different Morphologies for Oxygen Reduction Reaction

引用

Journal of Wuhan University of technology(Materials science) 2015年第5期30卷 882-887页

作者：汪广进 HUANG Fei XU Tian YU Yi CHENG Feng ZHANG Yue 潘牧 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cell College of Chemistry and Materials Science Hubei Engineering University Sericultural & Agri-food Research Institute Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing

Iridium dioxide with different morphologies(nanorod and nanogranular) is successfully prepared by a modified sol-gel and Adams methods. The catalytic activity of both samples for oxygen reduction reaction is investigated in an alkaline solution. The electrochemical results show that the catalytic activity of the nanogranular Ir O2 sample is superior to that of the nanorod sample due to its higher onset potential for oxygen reduction reaction and higher electrode current density in low potential region. The results of Koutecky-Levich analysis indicate that the oxygen reduction reaction catalyzed by both samples is a mixture transfer pathway. It is dominated by four electron transfer pathway for both samples in high overpotential area, while it is controlled by two electron transfer process for both samples in low overpotential area.

关键词： Iridium dioxide modified sol-gel method Adams method oxygen reduction reaction

来源：评论

学校读者我要写书评

暂无评论

Effects of ultrahigh pressure extraction on yield and antioxidant activity of chlorogenic acid and cynaroside extracted from flower buds of Lonicera japonica

引用

Chinese Journal of Natural Medicines 2015年第6期13卷 445-453页

作者： HU Wen GUO Ting JIANG Wen-Jun DONG Guang-Li CHEN Da-Wei YANG Shi-Lin LI He-Ran College of Pharmacy Soochow University Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University Guiding Long Da Honeysuckle Technology Co. Ltd.

The present study was designed to establish and optimize a new method for extracting chlorogenic acid and cynaroside from Lonicera japonica Thunb. through orthogonal experimental designl. A new ultrahigh pressure extraction （UPE） technology was applied to extract chlorogenic acid and cynaroside from L. japonica. The influential factors, including solvent type, ethanol concentration, extraction pressure, time, and temperature, and the solid/liquid ratio, have been studied to optimize the extraction process, The optimal conditions for the UPE were developed by quantitative analysis of the extraction products by HPLC-DAD in comparison with standard samples. In addition, the microstructures of the medicinal materials before and after extraction were studied by scanning electron microscopy （SEM）. Furthermore, the extraction efficiency of different extraction methods and the 2, 2-diphenyl-1-picrylhydrazyl （DPPH） radical scavenging activities of the extracts were investigated. The optimal conditions for extracting chlorogenic acid and cynaroside were as follows： ethanol concentration, 60%; extraction pressure, 400 MPa; extraction time, 2 rain; extraction temperature, 30 ℃; and the solid/liquid ratio, 1 ： 50. Under these conditions, the yields of chlorogenic acid and cynaroside were raised to 4.863% and 0.080%, respectively. Compared with other extraction methods, such as heat reflux extraction （HRE）, ultrasonic extraction （UE）, and Sohxlet extraction （SE）, the UPE method showed several advantages, including higher extraction yield, shorter extraction time, lower energy consumption, and higher purity of the extracts. This study could help better utilize L. japonica flower buds as a readily accessible source of natural antioxidants in food and pharmaceutical industries.

关键词： Lonicerajaponica Thunb. Ultrahigh pressure extraction Chlorogenic acid Cynaroside Antioxidant activity

来源：评论

学校读者我要写书评

暂无评论

Realization of quantum spin hall state in monolayer 1T’-WTe2

arXiv

引用

arXiv 2017年

作者： Tang, Shujie Zhang, Chaofan Wong, Dillon Pedramrazi, Zahra Tsai, Hsin-Zon Jia, Chunjing Moritz, Brian Claassen, Martin Ryu, Hyejin Kahn, Salman Jiang, Juan Yan, Hao Hashimoto, Makoto Lu, Donghui Moore, Robert G. Hwang, Chancuk Hwang, Choongyu Hussain, Zahid Chen, Yulin Ugeda, Miguel M. Liu, Zhi Xie, Xiaoming Devereaux, Thomas P. Crommie, Michael F. Mo, Sung-Kwan Shen, Zhi-Xun Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University StanfordCA94305 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China School of Physical Science and Technology Shanghai Tech University Shanghai200031 China Department of Physics University of California at Berkeley BerkeleyCA94720 United States Max Plank POSTECH Center for Complex Phase Materials POSTECH Pohang37673 Korea Republic of Department of Physics Pusan National University Busan46241 Korea Republic of Pohang Accelerator Laboratory POSTECH Pohang37673 Korea Republic of Department of Physics and Clarendon Laboratory University of Oxford Parks Road OxfordOX1 3PU United Kingdom Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Ikerbasque Basque Foundation for Science Bilbao48013 Spain CIC nanoGUNE San Sebastián20018 Spain Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy Nano Sciences Institute University of California and Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

A quantum spin Hall (QSH) insulator is a novel two-dimensional quantum state of matter that features quantized Hall conductance in the absence of magnetic field, resulting from topologically protected dissipationless edge states that bridge the energy gap opened by band inversion and strong spin-orbit coupling. By investigating electronic structure of epitaxially grown monolayer 1T’-WTe2 using angle-resolved photoemission (ARPES) and first principle calculations, we observe clear signatures of the topological band inversion and the band gap opening, which are the hallmarks of a QSH state. Scanning tunneling microscopy measurements further confirm the correct crystal structure and the existence of a bulk band gap, and provide evidence for a modified electronic structure near the edge that is consistent with the expectations for a QSH insulator. Our results establish monolayer 1T’-WTe2 as a new class of QSH insulator with large band gap in a robust two-dimensional materials family of transition metal dichalcogenides (TMDCs). Copyright © 2017, The Authors. All rights reserved.

关键词： Monolayers

来源：评论

学校读者我要写书评

暂无评论

Conjugated polymers developed from alkynes

引用

National science Review 2015年第4期2卷 493-509页

作者： Yajing Liu Jacky W.Y.Lam Ben Zhong Tang HKUST-Shenzhen Research Institute Department of Chemistry Division of Life Science State Key Laboratory of Molecular NeuroscienceInstitute for Advanced Study Institute of Molecular Functional Materials and Division of Biomedical Engineering The Hong Kong University of Science and Technology Guangdong Innovative Research Team SCUT-HKUST Joint Research Laboratory State Key Laboratory of Luminescent Materials and Devices South China University of Technology

The numerous merits of conjugated polymers(CPs) have encouraged scientists to develop a variety of synthetic routes to CPs with diverse structures and functionalities. Among the large scope of substrates,alkyne plays an important role in constructing polymers with conjugated backbones. In addition to some well-developed reactions including Glaser–Hay and Sonogashira coupling, azide/thiol-yne click reaction and cyclotrimerization, some novel alkyne-based reactions have also been explored such as oxidative polycoupling, decarbonylative polycoupling and multicomponent tandem polymerizations. his review focuses on the recent progress on the synthetic methodology of CPs in the last ive years using monomers with two or more triple bonds and some of their high-technological applications. Selected examples of materials properties of these CPs are given in this review, such as luorescence response to chemical or physical stimuli, magnetism, white light emission, cell imaging and bioprobing. Finally, a short perspective is raised in regard to the outlook of the preparation methodologies, functionalities as well as potential applications of CPs in the future.

关键词： conjugated polymer alkyne synthetic methodology functional polymer

来源：评论

学校读者我要写书评

暂无评论

Correction: Synthesis of midblock-quaternized triblock copolystyrenes as highly conductive and alkaline-stable anion-exchange membranes

引用

Polymer Chemistry 2017年第14期8卷 2276-2276页

作者： Meng Zhu Min Zhang Quan Chen Yanxia Su Zhijie Zhang Lei Liu Yiguang Wang Linan An Nanwen Li Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical University Xi'an China College of Materials Science and Engineering Beijing Institute of Petrochemical Technology Beijing China Beijing Key Lab of Special Elastomeric Composite Materials Beijing China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun China State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan China Department of Materials Science and Engineering Advanced Materials Processing and Analysis Center University of Central Florida Orlando FL 32816 USA

Correction for ‘Synthesis of midblock-quaternized triblock copolystyrenes as highly conductive and alkaline-stable anion-exchange membranes’ by Meng Zhu et al., Polym. Chem., 2017, DOI: 10.1039/c6py02213h.

Correction for ‘Synthesis of midblock-quaternized triblock copolystyrenes as highly conductive and alkaline-stable anion-exchange membranes’ by Meng Zhu et al., Polym. Chem., 2017, DOI: 10.1039/c6py02213h.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Dynamic behavior of the 3CaO-1Al2O3 liquid

Dynamic behavior of the 3CaO-1Al2O3 liquid

引用

The 24th International Congress on Glass

作者： R.K.Pan A.Qiao H.Z.Tao J.Ruan X.J.Zhao G.N.Greaves Y.Z.Yue State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology School of Materials Science and Engineering Hubei University Centre for Advanced Functional Materials and Devices Institute of Mathematics and PhysicsAberystwyth University Department of Chemistry and Bioscience Aalborg University

Calcium aluminates（CaO）（AlO）are main components in the Earth's mantle and also in the aluminate cement,which have been studied by many researchers.)Calcium aluminates are very fragile glass formers and do not ... 详细信息

关键词： ADL CaO Dynamic behavior of the 3CaO-1Al2O3 liquid

来源：评论

学校读者我要写书评

暂无评论

Reaching a Fermi-superfluid state near an orbital Feshbach resonance

引用

Physical Review A 2016年第3期94卷 033609-033609页

作者： Junjun Xu Ren Zhang Yanting Cheng Peng Zhang Ran Qi Hui Zhai Department of Physics University of Science and Technology Beijing Beijing 100083 China Institute for Advanced Study Tsinghua University Beijing 100084 China Department of Physics Renmin University of China Beijing 100872 China Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices 100872 (Renmin Univeristy of China) Beijing Computational Science Research Center Beijing 100084 China

We propose to realize a strongly interacting Fermi superfluid near a narrow Feshbach resonance using the recently discovered “orbital Feshbach resonance.” The orbital Feshbach resonance is a type of magnetic field tunable scattering resonance theoretically predicted and experimentally observed recently in the alkaline-earth-metal-like Yb173 atom. We first show that the orbital Feshbach resonance is a narrow resonance in energy, while it is hundreds Gauss wide in terms of magnetic field strength, taking the advantage that the magnetic moment difference between the open and closed channels is quite small. Therefore, this is an ideal platform for the experimental realization of a strongly interacting Fermi superfluid with narrow resonance. We further show that the transition temperature for the Fermi superfluid in this system, especially at the BCS side of the resonance, is even higher than that in a wide resonance, which is also due to the narrow character of this resonance. Our results will encourage experimental efforts to realize Fermi superfluid in the alikaline-earth-metal-like Yb173 system, the properties of which will be complementary to extensively studied Fermi superfluids nearby a wide resonance in alkali-metal K40 and Li6 systems.

关键词： Fermionic condensates Scattering theory Atomic gases Fermi gases Random phase approximation

来源：评论

学校读者我要写书评

暂无评论

The modulation of stem cell behaviors by functionalized nanoceramic coatings on Ti-based implants

引用

Bioactive Materials 2016年第1期1卷 65-76页

作者： Xiangmei Liu Man Li Yizhou Zhu K.W.K.Yeung Paul K.Chu Shuilin Wu Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsFaculty of Materials Science&EngineeringHubei UniversityWuhan 430062China Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma The University of Hong Kong Shenzhen Hospital1 Haiyuan 1st RoadFutian DistrictShenzhenChina Division of Spine Surgery Department of Orthopaedics&TraumatologyLi Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong KongChina Department of Physics&Materials Science City University of Hong KongTat Chee AvenueKowloonHong KongChina

Nanoceramic coating on the surface of Ti-based metallic implants is a clinical potential option in orthopedic *** cells have been found to have osteogenic *** is necessary to study the influences of functionalized nanoceramic coatings on the differentiation and proliferation of stem cells in vitro or in *** this paper,we summarized the recent advance on the modulation of stem cells behaviors through controlling the properties of nanoceramic coatings,including surface chemistry,surface roughness and *** addition,mechanotransduction pathways have also been discussed to reveal the interaction mechanisms between the stem cells and ceramic coatings on Ti-based *** the final part,the osteoinduction and osteoconduction of ceramic coating have been also presented when it was used as carrier of BMPs in new bone formation.

关键词： Nanoceramic coating Ti Stem cell Modulation Implants

来源：评论

学校读者我要写书评

暂无评论

Emergence of skyrmions from rich parent phases in the molybdenum nitrides

引用

Physical Review B 2016年第6期93卷 060409(R)-060409(R)页

作者： Wei Li Chiming Jin Renchao Che Wensen Wei Langsheng Lin Lei Zhang Haifeng Du Mingliang Tian Jiadong Zang State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity Shanghai Institute of Microsystem and Information Technology and CAS-Shanghai Science Research Center Chinese Academy of Sciences Shanghai 200050 China High Magnetic Field Laboratory Chinese Academy of Science (CAS) Hefei 230031 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu 210093 China Laboratory of Advanced Materials Department of Materials Science Collaborative Innovation Center of Chemistry for Energy Materials Fudan University Shanghai 200438 China Hefei National Laboratory for Physical Science at Microscale and Department of Physics University of Science and Technology of China Hefei 230026 China Department of Physics and Materials Science Program University of New Hampshire Durham New Hampshire 03824 USA

We report a new family of skyrmion materials originated from the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Based on the symmetric tensor technique, the molybdenum nitrides with the β-manganese structure, A2Mo3N with A=Fe, Co, Rh, are predicted to support the skyrmion phase. This predication is directly proved in doped FexCo1−xRh0.5Mo3N components by high-resolution Lorentz transmission electron imaging. Interestingly, the parent compounds Fe2Mo3N, Co2Mo3N, and Rh2Mo3N exhibit ferromagnetic, antiferromagnetic, and possible superconducting orderings, respectively. Magnetism in these parent phases is theoretically clarified by the first-principle calculations, where the corrected nature of the magnetism is revealed.

关键词： Density of states Dzyaloshinskii-Moriya interaction Magnetism Skyrmions Classical spin models Nanostructures First-principles calculations

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：