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Synthesis of Non-oxide Porous Ceramics Using Random Copolymers as Precursors

Journal of Materials science & technology 2015年第1期31卷 120-124页

作者： Xiaoqian Wang Kewei Wang Jie Kong Yiguang Wang Linan An State Key Laboratory of Solidification Processing Northwestern Polytechnical University Science and Technology on Thermo structural Composite Materials Laboratory Northwestern Polytechnical University Department of Applied Chemistry School of ScienceNorthwestern Polytechnical University Department of Materials Science and Engineering Advanced Materials Processing and Analysis CenterUniversity of Central Florida

In this paper,we reported a novel method for synthesis of non-oxide porous ceramics by using random copolymers as precursors.A silazane oligomer and styrene monomer were used as starting materials,which were copolymerized at 120 ℃ to form random polysilazane-polystyrene *** copolymers were then pyrolyzed at 500 ℃ to obtain porous ceramics by completely decomposing polystyrene（PS） and converting polysilazane（PSZ） into non-oxide Si-C-N *** obtained material contained a bi-model pore-structure consisting of both micro-sized and nano-sized pores with very high surface area of more than500 m;/*** also demonstrated that the pore structure and surface area of the materials can be tailored by changing the ratio of the two *** results suggest a promising simple method for making multiscaled porous non-oxide materials.

关键词： Non-oxide porous ceramics Polymer-derived ceramics

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Back Cover: Potential-Cycling Synthesis of Single Platinum Atoms for Efficient Hydrogen Evolution in Neutral Media (Angew. Chem. Int. Ed. 44/2017)

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Angewandte Chemie International Edition 2017年第44期56卷

作者： Lihan Zhang Dr. Lili Han Haoxuan Liu Dr. Xijun Liu Prof. Jun Luo Center for Electron Microscopy TUT-FEI Joint Laboratory Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials & Low-Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

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Preparation of Sintered(Ce_(1-x)Nd_x)_(30)Fe_(bal)Cu_(0.1)B_1 Magnets by Blending Powder Method

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Journal of Iron and Steel Research International 2015年第7期22卷 598-601页

作者： Shu-lin HUANG Hai-bo FENG Ming-gang ZHU An-hua LI Yue ZHANG Wei LI Functional Materials Research Institute Central Iron and Steel Research Institute School of Materials Science and Engineering University of Science and Technology Beijing Beijing Engineering Laboratory of Advanced Metallic Magnetic Materials and Preparation Techniques

Magnets with nominal compositions of （ Nd1-x Cex ） 30 Febal Cu0.1 B1 （x = 0, 0.15, 0.3 and 0.4, mass% ） have been fabricated by blending powder method. The remanence （B r）, intrinsic coercivity （He） and maximum en- ergy product （BH） of the RE2Fe14B type magnets deteriorated when Nd was replaced by Ce. The chemical composition and crystal structure of magnet were investigated systemically. Backscattered electron （BSE） and energy dispersive spectroscopy （EDS） results revealed that Ce-rich and Ce-lean matrix grains coexisted in the magnets. The magnetic coupling mechanism among the double hard magnetic phases was discussed. Low melting point RE-Cu phase was in favor of the formation of uniform continuous grain boundary. Transmission electron microscopy （TEM） investigation showed the presence of fcc （Nd,Ce）Ox phase in the grain boundary. When the Ce content was 15% of the total amounts of all the rare earth, the maximum energy product of the sintered magnet was 359.8 kJ/ms.

关键词：（Nd1-x Cex ） 30 FebalCu0.1 B1 magnet magnetic property microstructure grain boundary

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Multichannel Exchange-Scattering Spin Polarimetry

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Physical Review Letters 2016年第17期116卷 177601-177601页

作者： Fuhao Ji Tan Shi Mao Ye Weishi Wan Zhen Liu Jiajia Wang Tao Xu Shan Qiao Physics Department Laboratory of Advanced Materials and Surface Physics Laboratory (National Key Laboratory) Fudan University 2005 Songhu Road Shanghai 200438 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China Advanced Light Source Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley California 94720 USA School of Physical Science and Technology ShanghaiTech University 319 Yueyang Road Shanghai 200031 China

Electron spin plays important roles in determining the physical and chemical properties of matter. However, measurements of electron spin are of poor quality, impeding the development of material sciences, because the spin polarimeter has a low efficiency. Here, we show an imaging-type exchange-scattering spin polarimeter with 6786 channels and an 8.5×10−3 single channel efficiency. As a demonstration, the fine spin structure of the electronic states in bismuth (111) is investigated, for which strong Rashba-type spin splitting behavior is seen in both the bulk and surface states. This improvement paves the way to study novel spin related phenomena with unprecedented accuracy.

关键词： Spin-resolved photoemission spectroscopy

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Investigation on the interface coating without strength degradation of fiber in oxide fibers reinforced composites 20

Investigation on the interface coating without strength degr...

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20th International Conference on composite Materials, ICCM 2015

作者： Nijuan, Sun Chi, Wang Juan, Zhang Dahai, Zhang Science and Technology Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China

The mechanical properties, especially the tensile strength of ceramic matrix composites are primarily determined by the tensile strength of the continuous fibers in the woven fabrics. Therefore, high retention of fiber tensile strength after fiber pretreating/coating and forming processing is expected. In the present work, we developed an efficient lanthanum phosphate interface coating on woven oxide ceramic fabrics by vacuum infiltration plus online liquid precipitation. These interface coatings minimize the tensile strength degradation for woven oxide ceramic fabrics during fiber coating and matrix processing. The retention of tensile strength for both kinds of oxide ceramic woven is upper to 70% after coating processing. Furthermore, the mechanical properties of ceramic matrix composites at high temperature are also optimized. For instance, the tensile strength retention at 1200℃ for alunina fiber reinforced composites is promoted ~70% compared with the situation without the interface coating, while tensile strength of quarz fiber reinforced oxide composites increased more than 50%. The invesigation have potential applicaion for preparing composites in long service life in oxidizing and high temperature environments. © 2015 International Committee on composite Materials. All rights reserved.

关键词： Alumina/quartz fiber reinforced composites Interface coating Lanthanum phosphate Low degradation Tensile strength

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Rücktitelbild: Potential‐Cycling Synthesis of Single Platinum Atoms for Efficient Hydrogen Evolution in Neutral Media (Angew. Chem. 44/2017)

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Angewandte Chemie 2017年第44期129卷

作者： Lihan Zhang Lili Han Haoxuan Liu Xijun Liu Jun Luo Center for Electron Microscopy TUT-FEI Joint Laboratory Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials & Low-Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

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Thermophysical and mechanical properties of zirconia fibrous ceramics for thermal protection 20th

Thermophysical and mechanical properties of zirconia fibrous...

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20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015

作者： Sun, Jingjing Sun, Chencheng Zhou, Jiejie Wang, Xiaoting Song, Zhaoxu Hu, Zijun Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China

ISBN: (纸本)9781624103209

Zirconia fibrous ceramics with high porosity (porosity=70-90%) were fabricated and investigated for high-temperature thermal protection applications. Two types of zirconia fibers, tetragonal and cubic phases, were compared. The results showed that the ceramics made of cubic-phase fibers had lower room-temperature thermal conductivity and lower mechanical strength. In addition, the effects of fiber diameter on the properties were also studied. Using the fibers with smaller diameter, the sample’s thermal conductivity decreased, but the compressive strength also decreased slightly. It was found that the ceramics’ room-temperature thermal conductivity and mechanical strengths varied with porosity linearly or exponentially, respectively. The ceramics’ thermal expansion and thermal capacity in the range of RT~900 were measured. The high ℃ -temperature insulation performance was evaluated by back temperature tests. Finally, the porous ceramics were impregnated with aerogels. The room-temperature as well as high-temperature thermal conductivities both decreased. Therefore, the zirconia fibrous ceramics is a promising candidate for high-temperature insulation applications. © 2015 AIAA American Institute of Aeronautics and Astronautics. All rights reserved.

关键词： Zirconia

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Characterising acute and chronic care needs: insights from the Global Burden of Disease Study 2019

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Nature communications 2025年第1期16卷 4235-4235页

作者： Cecilia Anza-Ramirez J. Jaime Miranda Benedetta Armocida Jorge César Correia Harriette Gillian Christine Van Spall David Beran Amirali Aali Kalkidan Hassen Abate Semagn Mekonnen Abate Cristiana Abbafati Mohsen Abbasi-Kangevari Zeinab Abbasi-Kangevari Zahra Aryan Sina Azadnajafabad Mohammadreza Azangou-Khyavy Seyyed-Hadi Ghamari Mohammad Keykhaei Javad Khanali Sara Momtazmanesh Fateme Montazeri Shayan Rahmani Mohammad-Mahdi Rashidi Nazila Rezaei Negar Rezaei Sahar Saeedi Moghaddam Hossein Hassanian-Moghaddam Ali-Asghar Kolahi Ali Nikoobar Hedayat Abbastabar Ahmed M. Abdel-Azeem Michael Abdelmasseh Juan Sanabria Sherief Abd-Elsalam Ahmed Abdelwahab Gholamreza Abdoli Mohammad Abdollahi Meriem Abdoun Deldar Morad Abdulah Abu Yousuf Md Abdullah Ame Mehadi Abdurehman Getachew Abebe Aidin Abedi Chirag P. Doshi Vida Abedi Hassan Abidi Richard Gyan Aboagye Hassan Abolhassani Nima Rezaei Lucas Guimarães Abreu Michael R. M. Abrigo Yonas Derso Abtew Hiwa Abubaker Ali Eman Abu-Gharbieh Hiba Jawdat Barqawi Rabih Halwani Maha Mohamed Saber-Ayad Iman M. Talaat Ahmed Abu-Zaid Manfred Mario Kokou Accrombessi Juan Manuel Acuna Denberu Eshetie Adane Tigist Demssew Adane Isaac Yeboah Addo Giovanni Addolorato Oluwafemi Atanda Adeagbo Victor Adekanmbi Miracle Ayomikun Adesina Isaac Iyinoluwa Olufadewa Olatunji O. Adetokunboh Daniel Adedayo Adeyinka Qorinah Estiningtyas Sakilah Adnani Aanuoluwapo Adeyimika Afolabi Olayinka Stephen Ilesanmi Muhammad Sohail Afzal Saira Afzal Gina Agarwal Prerna Agarwal Pradyumna Agasthi Anurag Agrawal Marcela Agudelo-Botero Adolfo Martinez-Valle Bright Opoku Ahinkorah Aqeel Ahmad Sajjad Ahmad Sohail Ahmad Tauseef Ahmad Ali Ahmadi Siamak Sabour Keivan Ahmadi Sanjay Basu Sepideh Ahmadi Ali Ahmed Shaun Wen Huey Lee Ayman Ahmed Haroon Ahmed Jivan Qasim Ahmed Gahin Abdulraheem Tayib Yahya Yahya Luai A. Ahmed Iffat Elbarazi Syed Mahboob Shah Janardhana P. Aithala Marjan Ajami Budi Aji Hossein Akbarialiabad Yibeltal Akelew Meisam Akhlaghdoust Elham Jamshidi Addis Aklilu Azene Tesfaye Melat Woldemariam Maxwell Ak CRONICAS Center of Excellence in Chronic Diseases Universidad Peruana Cayetano Heredia Lima Peru School of Medicine Universidad Peruana Cayetano Heredia Lima Peru Sydney School of Public Health Faculty of Medicine and Health University of Sydney Sydney NSW Australia Faculty of Epidemiology and Population Health London School of Hygiene & Tropical Medicine London UK Division of Tropical and Humanitarian Medicine University of Geneva Geneva Switzerland Department of Cardiovascular Endocrine-metabolic Diseases and Aging Istituto Superiore di Sanità Rome Italy Division of Endocrinology Diabetology Nutrition and Therapeutic Patient Education Department of Medicine Geneva University Hospitals Geneva Switzerland Department of Medicine and Department of Health Research Evidence and Impact McMaster University Hamilton ON Canada Research Institute of St. Joe’s Hamilton ON Canada Population Health Research Institute Hamilton Canada Geneva University Hospitals Geneva Switzerland Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran Department of Nutrition and Dietetics Jimma University Jimma Ethiopia Anesthesiology Department Dilla University Addis Ababa Ethiopia Department of Juridical and Economic Studies La Sapienza University Rome Italy Non-Communicable Diseases Research Center Tehran University of Medical Sciences Tehran Iran Social Determinants of Health Research Center Shahid Beheshti University of Medical Sciences Tehran Iran Brigham and Women’s Hospital Harvard University Boston MA USA Students’ Scientific Research Center (SSRC) Tehran University of Medical Sciences Tehran Iran School of Medicine Tehran University of Medical Sciences Tehran Iran School of Medicine Shahid Beheshti University of Medical Sciences Tehran Iran Endocrinology and Metabolism Research Institute Tehran University of Medical Sciences Tehran Iran Chapter of Addiction Medicine University of Sydney Sydney NSW Australia Advanced Diagnostic and Intervent

Chronic care manages long-term, progressive conditions, while acute care addresses short-term conditions. Chronic conditions increasingly strain health systems, which are often unprepared for these demands. This study examines the burden of conditions requiring acute versus chronic care, including sequelae. Conditions and sequelae from the Global Burden of Diseases Study 2019 were classified into acute or chronic care categories. Data were analysed by age, sex, and socio-demographic index, presenting total numbers and contributions to burden metrics such as Disability-Adjusted Life Years (DALYs), Years Lived with Disability (YLD), and Years of Life Lost (YLL). Approximately 68% of DALYs were attributed to chronic care, while 27% were due to acute care. Chronic care needs increased with age, representing 86% of YLDs and 71% of YLLs, and accounting for 93% of YLDs from sequelae. These findings highlight that chronic care needs far exceed acute care needs globally, necessitating health systems to adapt accordingly. © 2025. The Author(s).

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Photocatalysis: Homojunction of Oxygen and Titanium Vacancies and its Interfacial n–p Effect (Adv. Mater. 32/2018)

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advanced Materials 2018年第32期30卷

作者： Si‐Ming Wu Xiao‐Long Liu Xi‐Liang Lian Ge Tian Christoph Janiak Yue‐Xing Zhang Yi Lu Hao‐Zheng Yu Jie Hu Hao Wei Heng Zhao Gang‐Gang Chang Gustaaf Van Tendeloo Li‐Ying Wang Xiao‐Yu Yang Bao‐Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics The Chinese Academy of Sciences Wuhan 430071 China Institut für Anorganische Chemie und Strukturchemie Heinrich‐Heine‐Universität Düsseldorf 40204 Düsseldorf Germany Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan 430062 China EMAT (Electron Microscopy for Materials Science) University of Antwerp Groenenborgerlaan 171 B‐2020 Antwerpen Belgium School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B‐5000 Namur Belgium

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Electrospun nanofiber enhanced sulfonated poly(arylene ether nitriles)-based proton conducting membrane

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AIP Conference Proceedings 2017年第1期1794卷

作者： Mengna Feng Yumin Huang Xiaobo Liu Research Branch of Advanced Functional Materials School of Microelectronic and Solid-State Electronic High Temperature Resistant Polymers and Composites Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu 610054 China

To study the effect of electrospun nanofiber on proton conductivity of sulfonated poly(arylene ether nitriles) (SPEN), the nanofiber mats were prepared by the electrospinning technology and the nanofiber/SPEN proton conducting membranes with different SHQ content were fabricated via impregnation method. For comparison, the casting SPEN membrane was also prepared by the solution-casting method. The scanning electron microscope (SEM) was used to observe the morphologies of electrospinning nanofiber mats. The water uptake, thermal and oxidative stability of casting SPEN and the nanofiber/SPEN membranes were also detailed studied. Besides, the nanofiber/SPEN membranes possess the higher proton conductivity than that of casting SPEN. The SPEN composite membrane with 5 wt% SHQ nanofiber exhibits the highest proton conductivity of 0.044 S/cm and 0.0865 S/cm at 20 °C and 80 °C, respectively. However, after second times water treatment, the conductivities of nanofiber/SPEN membranes are all lower than that of original value due to the shift loss of dissociative sulfonic acid group. Therefore, although the electrospinning is a good method to improve proton conductivity, it is also a great challenge to avoid the shift loss of sulfonic acid group for the nanofiber/SPEN.

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