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Direct transformation of FGD gypsum to calcium sulfate hemihydrate whiskers:Preparation,simulations,and process analysis

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Particuology 2015年第2期13卷 53-59页

作者： Miao Miao Xin Feng Gangling Wang Shaomei Cao Wen shi liyi shi Nano Science and Technology Research Center Shanghai University

Calcium sulfate hemihydrate （CSH） whiskers were synthesized by phase transition in CaCl2 solution under atmospheric pressure. Analytical-grade calcium sulfate dihydrate （AR CSD） was used as the raw material for the synthesis of CSH whiskers, according to orthogonal experiments. The effects of reaction tem- perature, AR CSD content, H2SO4 content, and reaction time were investigated, and the crystallization conditions were optimized. The as-prepared CSH whiskers displayed a regular morphology and a highly uniform size, with an aspect ratio of 105, A simulation system was also established by blending various sulfates with AR CSD, to evaluate the effects of impurities in flue gas desulfurization （FGD） gypsum. The main aim was to prepare CSH whiskers directly from FGD gypsum, without any purification, using the optimized conditions. This is a facile potential alternative process for large-scale production of CSH whiskers using abundant FGD gypsum as source materials.

关键词： FGD gypsum Calcium sulfate Whisker Direct transformation Simulation analysis

Shape and size effects of ceria nanoparticles on the impact strength of ceria/epoxy resin composites

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Particuology 2011年第1期9卷 80-85页

作者： Xiaoqiang He Dengsong Zhang Hongrui Li Jianhui Fang liyi shi Research Center of Nano Science and Technology Shanghai University Shanghai 200444 China Department of chemistry Shanghai University Shanghai 200444 China

Ceria nanoparticles with various shapes （rods, cubes, and plates） and sizes were controllably synthesized and then introduced into epoxy resin. Subsequently, we investigated correlations between the shape and size of ceria nanostructures and the mechanical performance of composites. The samples were character- ized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. Compared with commercial ceria filled composites, the composites made with morphology-controlled ceria nanos- tructures show a higher impact strength. It is found that epoxy resins made with high-aspect-ratio ceria nanorods show the highest impact strength, up to 17.27 kJ/m2, which is about four times that of the neat epoxy resin.

关键词： Nanoparticles Ceria Composite Mechanical properties

Facile synthesis of Er^(3+)/Tm^(3+)co-doped magnetic/luminescent nanosystems for possible bioimaging and therapy applications

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Journal of Rare Earths 2022年第1期40卷 11-19页

作者： Hongyu Liu Jiabei Li Pengfei Hu Songqiang Sun liyi shi Lining Sun Research Center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China Department of Chemistry College of SciencesShanghai UniversityShanghai 200444China Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Instrumental Analysis&Research Center Shanghai UniversityShanghai 200444China

Manganese-zinc ferrite is a kind of very important magnetic ferrite *** properties of wide absorption band,sensitivity to ultraviolet(UV)light and tumor H_(2)O_(2) promise it to be possibly used as a photothermal therapy(PTT),photodynamic therapy(PDT)and chemodynamic therapy(CDT)*** on the unique advantages of rare-earth doped nanoparticles,an Er^(3+),Tm^(3+)co-doped upconversion-mediated nanosystem with manganese-zinc ferrite shell(named as UCNPS@M)was developed through a facile thermal co-decomposition *** final nanosystems were surface-modified by using dopamine hydrochloride(DA)in order to warrant good biocompatibility(named as UCNPS@M@DA).Under irradiation of near-infrared(NIR)light,UCNPS emit both ultraviolet and visible *** UV light is mostly abso rbed by manga nese-zinc ferrite shell to produce reactive oxygen species(ROS),which is essential to the potential PDT and CDT effect of nanosystems,and at the same time,Mn_(0.5)Zn_(0.5)Fe2O_(4) can further react with H_(2)O_(2) to promote the efficiency of *** is expected that UCNPS@M@DA can act as upconversion luminescence imaging guidance due to the visible emission from *** addition,the energy absorbed by the nanosystems can be transferred to heat to realize photothermal ***,UCNPS@M@DA was successfully applied as a T_(1)/T_(2)-weighted magnetic resonance imaging(MRI)contrast agent due to the existence of Gd,Mn,and Fe *** light of the upconversion luminescence(UCL)imaging from the UCNPS as well as potential PTT,PDT,CDT effect mentioned above,this work provides a possibility to realize cancer multi-model bioimaging guided treatment by using an all-in-one diagnosis and therapy nanosystem through a simple yet powerful strategy.

关键词： Manganese-zinc ferrite Upconversion nanoparticles Photothermal effect Reactive oxygen species Good biocompatibility Rare earths

Influence of activated carbon fibres with different specific surface areas on the thermal conductive and electrical insulating properties of polyamide-imide composites

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High Voltage 2017年第3期2卷 161-166页

作者： Fang Jiang Li Chen Na Song liyi shi Peng Ding Research Center of Nanoscience and Nanotechnology Shanghai University99 Shangda RoadShanghai 200444People's Republic of China

In this study,the authors reported an influence of activated carbon fibres(ACFs)with different specific surface areas on the thermal conductive and electrical insulating properties of polymeric ***,the polyamide-imide composites were obtained via solution blending and cured *** composites exhibited thermal conductivity(TC)up to 0.62 W·m^(−1)·K^(−1).In addition,the composites were still insulating,having an electrical resistance of 0.7 MΩ.The experimental results suggested that the mechanical and electrical insulating properties decreased with the increasing of the specific surface area of the ***,it was found that the introduction of boron nitride was conducive to the TC and electrical insulating properties of the polymeric materials.

关键词： composites electrical thermal

Preparation of Ultra-nano Talcum in Sand Mill and Its Application in the Polypropylene

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Journal of Wuhan University of Technology(Materials Science) 2013年第1期28卷 12-16页

作者：宋娜 ZHANG Xiaoji shi liyi 丁鹏 FU Yi PENG Zhihong Research Center of Nanoscience and Nanotechnology Shanghai University Dongguan-SHU Institute of Nanotechnology (DSINT) Guangdong Silver Age Sci & Tech Co. Ltd.

The grinding of ultra-fine talcum powder and its application in a polypropylene （PP） matrix were investigated. Ultra-fine talcum powder was prepared by adjusting the grinding parameters of the physical milling process. The talcum powder exhibited polymodal distribution. The layered morphology of talcum particles in a horizontal sand mill was rarely damaged or destroyed. PP-talcum nanocomposites were prepared by melt blending using a twin-screw extruder. Nano talcum can be seen as a single particle, although it is not very apparent. The bending strength of talcum-filled PP was gradually increased by approximately 28%. The impact strength linearly decreased as the filler weight ratio increased. The overall maximum improvement in mechanical properties was recorded when the filler ratios increased from 15 wt% to 20 wt%.

关键词： inorganic mineral material ultra-fine talc powder polypropylene bending modulus

Controlled synthesis of porous spinel cobalt manganese oxides as efficient oxygen reduction reaction electrocatalysts

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Nano Research 2016年第1期9卷 207-213页

作者： Hongchao Yang Feng Hu Yejun Zhang liyi shi Qiangbin Wang Department of Chemistry Shanghai University 99 Shang-Da Road Shanghai200444 China Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

In this article, we report a facile precursor pyrolysis method to prepare porous spinel-type cobalt manganese oxides （CoxMng-xO4） with controllable morphologies and crystalline structures. The capping agent in the reaction was found to be crucial on the formation of the porous spinel cobalt manganese oxides from cubic Co2MnO4 nanorods to tetragonal CoMn2O4 microspheres and tetragonal CoMn204 cubes, respectively. All of the prepared spinel materials exhibit brilliant oxygen reduction reaction （ORR） electrocatalysis along with high stability. In particular, the cubic Co2MnO4 nanorods show the best performance with an onset potential of 0.9 V and a half-wave potential of 0.72 V which are very close to the commercial Pt/C. Meanwhile, the cubic Co2MnO4 nanorods present superior stability with negligible degradation of their electrocatalytic activity after a continuous operation time of 10,000 seconds, which is much better than the commercial Pt/C electrocatalvst.

关键词： porous nanostructure cobalt manganese oxides electrocatalyst oxygen reduction reaction

The Study on the Gas Sensitivity of the One-Dimensional ZnO

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稀有金属材料与工程 2006年第A03期35卷 170-172页

作者： Qun Xiang Rongli Liu liyi shi Zhiyin Ni Qingyi Pan Department of Chemistry Shanghai University Shanghai 200444 China

One-dimensional (1D) ZnO was prepared through hydrothermal synthesis by cetyltrimethylammonium bromide (CTAB) controling its *** products were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and scanning electron microscopy (SEM).The sintered gas sensor was prepared using ZnO nanorods and its gas sensitivity was measured in static gas *** result showed that the ZnO nanorods had lower working temperature than granulated ZnO and had very good sensitivity to 10μg/g trimethylamine (TMA),methanol,ammonia, acetone and ethanol at the working temperature of 170℃.SEM picture revealed that there were many multi-pores in the surface of the *** multi-pores might help to absorb gases and improve the gas sensitivity.

关键词： gas sensitivity one-dimensional Zn hydrothermal synthesis

Enhancing Photocatalytic Performance of NH 2-UIO66 by Defective Structural Engineering

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Transactions of Tianjin University 2021年第2期27卷 147-154页

作者： Zhenmin Xu Jiazhen Cao Xiang Chen liyi shi Zhenfeng Bian Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444China The Education Ministry Key Laboratory of Resource Chemistry Shanghai Key Laboratory of Rare Earth Function MaterialsShanghai Normal UniversityShanghai 200444China

NH_(2)-UIO66(NU)is a promising photocatalyst for the reduction of Cr(VI)to low-toxic Cr(III)driven by visible light under ambient ***,the main limitation in this process is the ineffi cient ligand to metal charge transfer(LMCT)of photo-excited electrons,which is caused by inherent energy gap(ΔE_(LMCT)).This study synthesized the defective NU(NUXH,where X is the molar equivalent of the modulator)with reducedΔE_(LMCT)through linkers removal via acid *** electronic structure of NUX-H was systematically investigated,and the results indicated that the structural defects in NUX-H strongly altered the environment of the Zr ***,they substantially lowered the energy of the unoccupied d orbitals(LUMO),which was benefi cial to effi cient LMCT,resulting in an improved photocatalytic activity of NUX-H toward high-concentration(100 mg/L)Cr(VI)*** to NU with defect-free structure,the reducing rate of Cr(VI)was increased by 47 *** work introduced an alternative strategy in terms of designing effi cient photocatalysts for reducing Cr(VI)under ambient conditions.

关键词： NH_(2)-UIO66 Defective structure Effi cient LMCT Photocatalysis Cr(VI)reduction

Advances of high-performance LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode materials and their precursor particles via co-precipitation process

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Particuology 2024年第3期86卷 67-85页

作者： Wenbiao Liang Yin Zhao liyi shi Zhuyi Wang Yi Wang Meihong Zhang Shuai Yuan School of Materials Science and Engineering Shanghai UniversityShanghai200444China Research Center of Nanoscience and Nanotechnology Shanghai UniversityShanghai200444China Emerging Industries Institute Shanghai UniversityJiaxingZhejiang314006China

Layered LiNi_(1-x-y)Co_(x)M_(y)O_(2)(M=Mn or Al)is a promising cathode material for lithium-ion batteries due to its high specific capacity and acceptable manufacturing ***,the polycrystalline LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode material suffers from disordered orientation of primary particles and poor geometric symmetry of secondary particles,which severely hampers the migration of Lit ***,the resulting anisotropy accelerates the disintegration of the secondary particle structure,significantly affecting the electrochemical performance of the polycrystalline *** spite of less grain boundary,the single-crystal LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathodes still suffer from severe microcracks generated by repeated planar gliding during cycling,which poses a great challenge to the cycling stability of single-crystal ***'s worth noting that the microstructure of the cathode material is mainly inherited from its ***,it is necessary to deeply understand the influence of the microstructure of Ni_(1-x-y)Co_(x)M_(y)(OH)2 on the electrochemical properties of LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode materials,so as to optimize the production process of preparing high-performance cathode *** this review,we summarize recent advances in the research and development of Ni-rich cathode precursor ***,the challenges faced by the Ni-rich hydroxide precursor materials are presented,including the effect of primary particle morphology and arrangement on the electrochemical performance of cathode materials,the influence of secondary particle morphology on lithium insertion reactions in cathode,and the effect of particle size on the microcracking of single-crystal ***,the presentation of the conventional co-precipitation reactor,the mechanism of precursor particle growth,and the influence of coprecipitation parameters are described in ***,the strategies are systematically discussed to solve the cha

关键词： Lithium-ion batteries Cathode materials Co-precipitation Ni-rich layered oxides Single crystal Precursor particles