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Nanocomposites based on lanthanide-doped upconversion nanoparticles:diverse designs and applications

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Light(Science & Applications) 2022年第8期11卷 1730-1752页

作者： Kaimin Du Jing feng xuan Gao Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022JilinChina State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Science116023DalianChina University of Science and Technology of China HefeiAnhui230026China Department of Chemistry Tsinghua University100084BeijingChina

Lanthanide-doped upconversion nanoparticles(UCNPs)have aroused extraordinary interest due to the unique physical and chemical *** UCNPs with other functional materials to construct nanocomposites and achieve synergistic effect abound recently,and the resulting nanocomposites have shown great potentials in various fields based on the specific design and *** review presents a summary of diverse designs and synthesis strategies of UCNPs-based nanocomposites,including self-assembly,in-situ growth and epitaxial growth,as well as the emerging applications in bioimaging,cancer treatments,anti-counterfeiting,and photocatalytic *** then discuss the challenges,opportunities,and development tendency for developing UCNPs-based nanocomposites.

关键词： properties. lanthanide synergistic

Effect of baffles on bubble behavior in a bubbling fluidized bed for chemical looping processes

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Particuology 2020年第6期18卷 154-167页

作者： Xiao Zhu xuan feng Yuanyuan Zou Laihong Shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096China

A bubbling fluidized bed is generally used as the fuel reactor in chemical looping ***,in sufficient gas-solid contact remains a steadfast *** such,we propose the use of in ternal baffles to split bubbles at a high gas velocity and to restrict the movement of large-scale solids in the fluidized *** investigated the effect of baffle arrangement on the bubble size and energy,pressure gradient,particle distribution,and particle velocity in a fluidized bed using a computational particle fluid dynamics simulation based on our experimental *** discuss the main influenci ng factors,which in elude presence of caps,number of baffles,and the baffle opening *** baffle structure with caps efficiently broke the large bubbles without creating jet *** baffles were deemed suitable in the bed owing to the small bubble size and uniform gas-solid distribution in each *** selected a baffle opening ratio of 20.5%,which improved the flow pattern without causing a significant increase in the pressure gradient and particle velocity through the *** also discussed the potential for sea ling up this baffled fluidized bed for industrial applications.

关键词： Baffle Bubble behavior Fluidized bed Chemical looping CPFD simulations

CuPbBi_(5)S_(9) thermoelectric material with an intrinsic low thermal conductivity:Synthesis and properties

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Journal of Materiomics 2022年第1期8卷 174-183页

作者： Hao Liang Jun Guo yun-xuan Zhou Zi-Yuan Wang Jing feng Zhen-Hua Ge Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China

CuPbBi_(5)S_(9) compounds have been investigated as gladite for ***,there have been no significant studies on their physical and chemical *** work demonstrates that upon alloying with moderate Cu,Pb,Bi,and S using an appropriate preparation method,quaternary CuPbBi_(5)S_(9) compounds can exhibit excellent figure of merit ZT within the temperature range 298-723 K.A low average velocity,low Young’s modulus and Debye temperature,and large Grüneisen parameter,determined experimentally,indicate strong lattice anharmonicity in CuPbBi_(5)S_(9) ***,density functional theory calculations(local vibration of low-frequency acoustic phonons)justify the low lattice thermal conductivity of CuPbBi_(5)S_(9) *** of the low thermal conductivity(0.514 W m^(-1)K^(-1))and a relatively high power factor(293 μW m^(-1)K^(-2)),a maximum ZT of 0.42 was achieved at 723 K for CuPbBi_(5)S_(9) prepared by mechanical alloying combined with solid-state ***,CuPbBi_(5)S_(9) materials are promising candidates for use as high-performance thermoelectric materials in the intermediate-temperature range.

关键词： CuPbBi_(5)S_(9) Elastic properties Phonon spectrum Low thermal conductivity

Macroscopic Regulation of Hierarchical Nanostructures in Liquid-crystalline Block Copolymers towards Functional Materials

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Chinese Journal of Polymer Science 2021年第4期39卷 397-416,I0004页

作者： feng Cai Yu-xuan Chen Wen-Zhong Wang Hai-feng Yu Department of Materials Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China

The great potential of liquid-crystalline block copolymers(LCBCs)containing photoresponsive mesogens toward novel applications in photonics and nanotechnology has been attracting increasing attention,due to the combination of the inherent property of microphase separation of block copolymers and the hierarchically-assembled structures of liquid-crystalline polymers(LCPs).The periodically ordered nanostructures in bulk film of LCBCs can be acquired by supramolecular cooperative motion,derived from the interaction between liquid-crystalline elastic deformation and microphase separation,which are able to improve physical properties of polymer film toward advanced functional ***,various micro/nano-patterned structures have been fabricated via light manipulation of photoresponsive LCBCs with good reproducibility and mass *** to recent developments in synthesis and polymerization techniques,diverse azobenzene-containing LCBCs have been designed,resulting in the creation of a wide variety of novel *** review illustrates recent progresses in macroscopic regulation of hierarchical nanostructures in LCBCs towards functional *** existing challenges are also discussed,showing perspectives for future studies.

关键词： Liquid-crystalline block copolymers Microphase separation Hierarchical nanostructures Functional materials

Special Topic on Bio-based and Biodegradable Polymers

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Science China Chemistry 2016年第11期59卷 1353-1354页

作者： Yu-Zhong Wang yun-xuan Weng State Key Laboratory of Polymer Materials Engineering National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan) College of Chemistry Sichuan University School of Materials and Mechanical Engineering Beijing Technology and Business University

In the past decades,bio-based and biodegradable polymers have attracted wide and increasing interests because of the shortage of fossil resource,concerns on environmental pollution,demands for some medical fields as well as support of government *** on the sustainable source of organic carbon,biodegradability and biocompatibility,these polymers have shown promising applications in industry,agriculture,biomedicine and daily *** impart excellent physical properties and functions to them,scientists and engineers have exploited versatile methods to tune

关键词： biodegradable sustainable fossil shortage agriculture versatile contributions interests polymerization controllable

B cell depletion in treating primary biliary cirrhosis:Pros and cons

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World Journal of Gastroenterology 2012年第30期18卷 3938-3940页

作者： Yu-feng Yin xuan Zhang Department of Rheumatology and Clinical Immunology Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100032 China

Primary biliary cirrhosis (PBC) is a progressive autoim- mune liver disease of unknown etiology that affects almost exclusively *** acid (UDCA) is currently the only approved drug by Food and Drug Administration for patients with *** the precise pathogenesis of PBC remains unclear,it has been postulated that many cell populations,including B cells,are involved in the ongoing inflammatory process,which implicates,not surprisingly,a potential thera- peutic target of depleting B cell to treat this *** is a chimeric anti-CD20 monoclonal antibody that has been approved for the treatment of lymphoma and some autoimmune diseases such as rheumatoid *** it is effective in the treatment of PBC has not been ***,Tsuda et al [1] demon- strated that B cell depletion with rituximab significantly reduced the number of anti-mitochondrial antibodies (AMA)-producing B cells,AMA titers,the plasma levels of immunoglobulins (IgA,IgM and IgG) as well as se- rum alkaline phosphatase,and it was well tolerated by all the treated patients with no serious adverse *** observation provides a novel treatment option for the patients with PBC who have incomplete response to UDCA.

关键词： Primary biliary cirrhosis Rituximab B cell depletion Anti-mitochondrial antibodies

Comparative Study of the Magnetic Properties and Glass-Forming Ability of Fe-Based Bulk Metallic Glass with Minor Mn, Co, Ni, and Cu Additions

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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 834-839页

作者： Md Anisur Rahman yun-Zhuo Lu Qiang Luo Shou-Jiang Qu feng-Xia Ye Yi-xuan Wu Jun Shen School of Materials Science and Engineering Tongji University School of Materials Science and Engineering Dalian Jiaotong University

Fe43MsCra5Mo14C15B6Y2 （M = Mn, Co, Ni, and Cu in at.%） bulk metallic glasses （BMGs） are synthesized using the suction casting technique, and the glass-forming ability （GFA）, microstructure, and thermal and magnetic properties of these glasses are extensively examined using X-ray diffraction, differential scanning calorimeter, and vibrating sample magnetometer techniques. Among the four BMG alloys, Fe43NisCr15Mo14C15B6Y2 exhibits the lowest coercivity and the highest saturation magnetization, Curie temperature, effective magnetic moment, and GFA. By contrast, Fe43MnsCrlsMo14C15B6Y2 presents the poorest magnetic properties, such as the highest coercivity and the lowest saturation magnetization, Curie temperature, and effective magnetic moment. Fe43Cu5Cr15MolaC15B6Y2 demonstrates the lowest thermal stability and GFA. The observed thermal, structural, and magnetic properties of these BMG alloys are discussed in terms of the kinetics of BMG synthesization and the formation of different ferromagnetic, ferrimagnetic, and antiferromagnetic phases.

关键词： Bulk metallic glasses Saturation magnetization Effective magnetic moment Coercivity Glass-forming ability

Low complexity robust linear transceiver design for MIMO interference channel

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The Journal of China Universities of Posts and Telecommunications 2016年第6期23卷 76-81页

作者： Geng xuan Li Conggai Liu feng College of Information Engineering Shanghai Maritime University

This paper focuses on the linear transceiver design for multiple input multiple output（MIMO） interference channel（IC）, in which a bounded channel error model is assumed. Two optimization problems are formulated as minimizing maximum per-user mean square error（MSE） and sum MSE with the per-transmitter power constraint. Since these optimization problems are not jointly convex on their variable matrices, the transmitter and receiver can be optimized alternately respectively. For each matrix, an approximated approach is presented where the upper bound of constraint is derived so that it has less semidefinite, thus the problem can be viewed as second-order-cone programming（SOCP） and gets less computational complexity. Compared with the conventional S-procedure method, the proposed approach achieves similar performance, but reduces the complexity significantly, especially for the system with large scale number of antennas.

关键词： MIMO interference channel robust linear transceiver SOCP

Synthesis of nanofluids composed of deep eutectic solvents and metal-modified MCM-41 particles as multifunctional promoters for fuel oil desulfurization

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1776-1787页

作者： Jing-xuan Zhang xuan Wang Yan-Ru feng Jia-Yu An Yu-xuan Chi Ya-Tai Liu Ling-Fei Zhang yun-Bo Zhao Xiang-feng Zeng Zi-Bo Wang Jia-Shuai Liu Yi-Fan Wang Shuai-Yong Dou Er-Hong Duan Tao Meng School of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control Shijiazhuang 050018China College of Science Hebei Agricultural UniversityBaoding 071001China

Compared with traditional hydrodesulfurization,new nonhydrodesulfurization methods have the advantage of a high removal efficiency for thiophene compounds under mild ***,independent nonhydrodesulfurization technologies are faced with their own shortcomings,such as limitations of the desulfurization performance and regeneration of *** overcome these limitations,four nanofluids were prepared by dispersing different metal-modified MCM-41 particles in deep eutectic solvent as multifunctional promoters to develop a comprehensive desulfurization *** on the excellent adsorbability and high catalytic activity of the dispersed particles and the outstanding extractability of deep eutectic solvent in nanofluids,a high sulfur removal of 99.33%was achieved for model oil under mild conditions in 15 *** nanofluids also showed excellent reusability due to their high structural *** addition,NF@Cu/Al-MCM-41-2.5%exhibited the best desulfurization performance among the prepared *** result was obtained because the introduction of Al ions increased the number of acid sites and defect sites to improve the catalytic activity and adsorbability,and the best affinity of Cu/Al-MCM-41 for the deep eutectic solvent favored the reaction mass *** work opens the door to the development of a comprehensive nonhydrodesulfurization method based on the design of nanofluid materials.

关键词： fuel oil desulfurization nanofluids catalytic ozonation