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Nanocrystalline High Entropy Alloys with Ultrafast Kinetics and High Storage Capacity for Large-Scale Room-Temperature-Applicable Hydrogen Storage

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Renewables 2024年第2期2卷 138-149页

作者： Long Luo Huimin Han DianChen Feng Wei Lv Liangpan Chen Lirong Li Tingting Zhai Suxia Liu Shiyang Sun Yiming Li wenli pei Junjie Cui Yongzhi Li School of Rare Earth Research and Development Inner Mongolia University of Science and TechnologyBaotou 014010 School of Materials Science and Engineering Northeastern UniversityShenyang 110819 Baotou Materials Research Institute of Shanghai Jiao Tong University Baotou 014010 School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010 Institute of Energy Power Innovation North China Electric Power UniversityBeijing 102206 Analytical and Testing Center Inner Mongolia University of Science and TechnologyBaotou 014010

High-entropy alloys(HEAs)are a promising solution for large-scale hydrogen storage(H-storage)and are therefore receiving increasing attention from the materials science *** this study,we systematically investigated the microstructures and H-storage properties of V_(35)Ti_(35)Cr_(10) Fe_(10)M_(10)(M=Mn,Co,Sc,or Ni)HEAs prepared by *** cast HEAs were found to be *** crystal lattice parameters and hydrogen absorption energies of the alloys were calculated using density functional theory(DFT)*** alloys can be fully activated in just one cycle of hydrogen absorption/desorption under mild conditions,after which they reach hydrogen absorption saturation in approximately 100 s at ambient *** hydrogenation kinetics of the HEAs are approximately five times higher than that of conventional solid-solution alloys with a body-centered cubic(BCC)*** performing in-situ hydriding differential scanning calorimetry in combination with DFT calculations,we revealed that the alloys are more susceptible to hydrogenation than traditional BCC structural *** H-storage capacity of V_(35)Ti_(35)Cr_(10) Fe_(10)M_(10) alloys at ambient temperature was higher than that of HEAs reported in the ***-in-situ X-ray diffraction characterization of the HEAs’hydrogenation revealed a phase transition process from a BCC to facecentered cubic,passing through a pseudo-BCC *** work introduces a new perspective for designing alloys with ultrafast hydrogen absorption kinetics and high capacity for large-scale,room-temperature-applicable H-storage.

关键词： high entropy alloys in-situ hydriding solid-state hydrogen storage nanocrystals kinetic properties

Correlation of Magnetic Properties of Co/Cr Bilayer Thin Films with Grain Boundary Diffusion

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Journal of Materials Science & Technology 2009年第6期25卷 789-794页

作者： Gaowu Qin Bo Yang wenli pei Yuping Ren Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110004 China

The microstructure and magnetic properties of Co/Cr bilayer films were examined before and after postdeposition annealing by using transmission electron microscopy （TEM）, X-ray diffraction （XRD） technique and vibrating sample magnetometer （VSM）. A model of grain boundary （GB） Cr-rich phase growth involving GB diffusion derived from the Cr underlayer was proposed to elucidate the kinetics of the paramagnetic Cr-rich phase growth along Co GBs within the Co layer. The correlation of the GB Cr-rich phase formation with the magnetic Co grain isolation and accordingly, improvement of magnetic properties was experimentally investigated and discussed in detail. Our analysis results are well consistent with previous micromagnetic simulations on the improvement of magnetic properties by the magnetic grain isolation. The results provide some insights into the processing-structure-property relationships of the Co/Cr bilayer films, and thus suggest that the magnetic grain isolation be feasible not only in longitudinal recording media, but also be effective in tuning the exchange coupling of magnetic grains in perpendicular recording media via the GB diffusion from underlayer and/or overlayer.

关键词： Magnetic recording media Grain boundary diffusion Magnetic isolation Co/Cr thin films

Effect of Phosphor Addition on Intergranular Exchange Coupling of Co-Pt Thin Films

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Journal of Materials Science & Technology 2011年第5期27卷 398-402页

作者： Bo Yang Gaowu Qin wenli pei Song Li Yuping Ren Shunji Ishio Key Laboratory for Anisotropy & Texture of Materials Northeastern University Shenyang 110004 China Department of Material Science & Engineering Akita University Akita 0108502 Japan

In this paper, ternary Co-Pt-P thin films were prepared by Co-P chips pasted on the cobalt target. The structure magnetron sputtering with platinum and home-made and magnetic properties were investigated by X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）, respectively. With increasing phosphor content, the coercivities of Co-12 at.% Pt-P films increase from 1034 to 1525 Oe owing to the exchange decoupling among magnetic grains. The decrease of inter-granular exchange coupling was confirmed by delta-M curve measurement and magnetic force microscopy （MFM）. Transmission electronic microscopy （TEM） with nano- beam composition analysis shows that phosphor segregated at cobalt-based grain boundaries is responsible for the exchange decoupling. It is thus suggested that the phosphor addition is effective to tune the exchange coupling of magnetic grains, particularly for perpendicular recording media.

关键词： Intergranular exchange coupling Co-Pt-P Delta-M Magnetic recording media

高效液相色谱法测定β-内酰胺抗生素中残留乙酸的含量

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中国抗生素杂志 2024年第4期49卷 388-393页

作者：冯艳春裴文莉王晨朱俐田冶崇小萌宋暤昀姚尚辰宁保明中国食品药品检定研究院北京102629

目的建立测定β-内酰胺类抗生素原料中乙酸残留量的HPLC方法。方法采用多因素组内设计方法,确定色谱流动相的组成、比例和pH值。参考ICH Q2,从专属性、检出限和定量限、线性、准确度、精密度和耐用性等6个方面对方法进行验证。用所建立... 详细信息

目的建立测定β-内酰胺类抗生素原料中乙酸残留量的HPLC方法。方法采用多因素组内设计方法,确定色谱流动相的组成、比例和pH值。参考ICH Q2,从专属性、检出限和定量限、线性、准确度、精密度和耐用性等6个方面对方法进行验证。用所建立的方法对19种β-内酰胺类抗生素原料进行了测定。结果采用C_(18)色谱柱,流动相:甲醇-0.02 mol/L磷酸二氢钾,梯度洗脱;柱温25℃;检测波长220 nm。供试品、溶剂和流动相对乙酸测定没有明显干扰;乙酸的最低检出限约为0.029μg,最低定量限约0.12μg;从定量限到限度2倍浓度范围内,方法的线性关系良好,拟合直线方程为y=388866.7186x-177.5720,r2=0.9999;低中高浓度加样回收率平均分别为93%,96%和99%;方法的重复性和中间精密度分别为2.37%和2.11%;在3根不同C_(18)色谱柱上的耐用性良好。19种β-内酰胺抗生素原料中有3种筛查出残留乙酸。结论所建方法可以实现对β-内酰胺类抗生素原料中残留乙酸的准确定量,为该类原料的生产过程控制和标准物质研制提供了依据。

关键词： β-内酰胺类抗生素原料乙酸反相高效液相色谱法

Magnetic Properties of Nd_8Fe_(83)Co_3B_6 Nanocomposite Magnets

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Journal of Materials Science & Technology 2000年第2期16卷 109-110页

作者： Fazeng LIAN, Guiqin ZHOU, wenli pei and Xueqin YAN (School of Materials and Metallurgy, Northeastern University, Shenyang 110006, China) Northeastern Univ Sch Met & Mat Shenyang 110006 Peoples R China

The influence of quenching technology, annealing temperature and time on the structures and magnetic properties of Nd_8Fe_83C_o_3B_6 nanocomposite magnets was investigated. The results show that the α-Fe/Nd_2 Fe_14 Bnanocomposite magnet containing a small amount of B is difficult to form amorphous state. The magnetic properties of 26 m/s quenched Nd_8Fe_83C_o_3B_6 powders annealed at 640℃×480 s reach _iH_c=513 kA/m, B_r=1.05 T and (BH)_max=92.0 kJ/m^3. The grain size is D_a-fe=21.5 um and D_Nd_2Fe_14B=30.2um.

关键词： Magnetic Properties of Nd8Fe Nd than rate

Synthesis of super-fine L1_(0)-FePt nanoparticles with high ordering degree by two-step sintering under high magnetic field

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Journal of Materials Science & Technology 2021年第14期73卷 178-185页

作者： Dong Zhao Xiaoyang Wang Ling Chang wenli pei Chun Wu Fei Wang Luran Zhang Jianjun Wang Qiang Wang Key Laboratory of Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang110819China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang110819China School of Materials Science and Engineering Liaoning Technical UniversityFuxin123000China College of Mechanical Engineering Shenyang UniversityShenyang110044China School of Materials Science and Engineering Yunnan UniversityKunming650091China

Super-fine L1_(0)-Fe Pt nanoparticles(NPs)with high ordering degree were successfully prepared by a modified two-step sintering method,which includes low-temperature pre-sintering,and the high magnetic field(HMF)assisted post-sintering *** particle size of the L1_(0)-FePt NPs was obviously refined by lowering the sintering *** applying the HMF during the post-sintering process,the fine size characteristics of L1_(0)-Fe Pt NPs were retained,and the ordering degree was significantly *** L1_(0)-Fe Pt NPs with sizes of about 4.5 nm,ordering degree of 0.940,and coercivity of 22.01 k Oe were obtained by this two-step sintering under a magnetic field of 12 *** mechanism investigation of HMF enhancing the ordering degree indicates that the HMF enhances lattice distortion and magnetization energy(Zeeman energy).The enhanced lattice distortions cause high stress existing in the lattice,which can effectively promote the disordered-order *** the magnetic field reaches to 3 T,the Zeeman energy of the NPs is higher than the thermal disturbing energy of the NPs,and the magnetization effect is ***,the HMF(higher than 3 T)can obviously improve the disorder-order transition by lowering the energy barrier and accelerating the orderly diffusions of *** HMF is a promising assistant to synthesize the L1_(0)-phase NPs with both of high ordering degree and super-fine size.

关键词： L1_(0)-FePt nanoparticles Super-fine size Disorder-order transition High magnetic field Zeeman energy

共沉淀法制备超细BaFe_(12)O_(19)纳米粒子及其性能

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金属功能材料 2024年第2期31卷 22-31页

作者：申佳宁常玲李明宇陈婉晴佟冰裴文利东北大学材料科学与工程学院辽宁沈阳110819 东北大学材料电磁过程研究教育部重点实验室辽宁沈阳110819 东北大学材料各向异性与织构教育部重点实验室辽宁沈阳110819 抚顺罕王傲牛矿业股份有限公司辽宁抚顺113125

BaFe_(12)O_(19)纳米粒子具有高矫顽力、高饱和磁化强度、分散性好的特点,超细的BaFe_(12)O_(19)纳米粒子在磁性器件、微波吸收、生物医学、磁记录等领域具有广阔应用前景。然而,制备超细的高性能BaFe_(12)O_(19)纳米粒子仍然是该领域... 详细信息

BaFe_(12)O_(19)纳米粒子具有高矫顽力、高饱和磁化强度、分散性好的特点,超细的BaFe_(12)O_(19)纳米粒子在磁性器件、微波吸收、生物医学、磁记录等领域具有广阔应用前景。然而,制备超细的高性能BaFe_(12)O_(19)纳米粒子仍然是该领域的难点。提出一种简便的共沉淀法制备M型BaFe_(12)O_(19)纳米粒子,成功获得高性能、分散性好的超细BaFe_(12)O_(19)纳米粒子,同时研究了制备工艺对粒子结构和性能的影响。结果表明:pH对BaFe_(12)O_(19)纳米粒子的成分、结晶度、形貌特征及磁性能影响显著,当pH为9时,颗粒结晶度高、分散性较好;随前驱体比例的升高,BaFe_(12)O_(19)纳米粒子的结晶度、形貌特征及磁性能随之发生变化,当前驱体比例为1∶12时,颗粒结晶度较高、磁性能高;在60℃的沉淀温度下沉淀反应1.5 h,当搅拌速率提升到600 r/min时,可获得高结晶度、矫顽力为5072 Oe、饱和磁化强度高达70 emu/g、平均粒径仅为33 nm的超细BaFe_(12)O_(19)纳米粒子。

关键词： BaFe_(12)O_(19) 纳米颗粒晶粒尺寸磁性能

Bispecific antibodies in cancer therapy:Target selection and regulatory requirements

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药学学报:英文版 2023年第9期13卷 3583-3597页

作者： Yanze Sun Xinmiao Yu Xiao Wang Kai Yuan Gefei Wang Lingrong Hu Guoyu Zhang wenli pei Liping Wang Chengliang Sun Peng Yang State Key Laboratory of Natural Medicines and Jiangsu Key Laboratory of Drug Design and Optimization ChinaPharmaceutical UniversityNanjing 210009China Department of Medicinal Chemistry School of PharmacyChina Pharmaceutical UniversityNanjing 211198China Institute of Innovative Drug Discovery and Development China Pharmaceutical UniversityNanjing 211198China

In recent years,the development of bispecific antibodies(bsAbs)has been rapid,with many new structures and target combinations being *** boom in bsAbs has led to the successive issuance of industry guidance for their development in the US and ***,there is a high degree of similarity in target selection,which could affect the development of diversity in *** review presents a classification of various bsAbs for cancer therapy based on structure and target selection and examines the advantages of bsAbs over monoclonal antibodies(mAbs).Through database research,we have identified the preferences of available bsAbs combinations,suggesting rational target selection options and warning of potential wastage of medical *** have also compared the US and Chinese guidelines for bsAbs in order to provide a reference for their development.

关键词： Bispecific antibody Target selection Structure Regulatory guidance Cancer immunotherapy Clinical trials Oncology Mechanism

Mutations of p53 gene exons 4-8 in human esophageal cancer

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World Journal of Gastroenterology 2005年第19期11卷 2998-3001页

作者： LI-YaLi Jin-TianTang Li-QunJia pei-wenli DepartmentofOncology China-JapanFriendshipHospitalBeijing100029China InstituteofMedicalPhysicsandEngineering TsinghuaUniversityBeijing100084China

AIM: To characterize the tumor suppressor gene p53 mutations in exon 4, esophageal cancer and adjacent noncancerous ***: We performed p53 (exons 4-8) gene mutation analysis on 24 surgically resected human esophageal cancer specimens by PCR, single-strand conformation polymorphism, and DNA sequencing. RESULTS: p53 gene mutations were detected in 9 of 22 (40.9%) esophageal cancer specimens and 10 of 17 (58.8%) adjacent non-cancerous tissues. Eight of sixteen (50.0%) point mutations detected were G-A transitions and 9 of 18 (50.0%) p53 gene mutations occurred in exon 4 in esophageal cancer specimens. Only 1 of 11 mutations detected was G-A transition and 4 of 11 (36.4%) p53 gene mutations occurred in exon 4 in adjacent non-cancerous ***: Mutation of p53 gene in exon 4 may play an important role in development of esophageal cancer. The observation of p53 gene mutation in adjacent noncancerous tissues suggests that p53 gene mutation may be an early event in esophageal carcinogenesis. Some clinical factors, including age, sex, pre-operation therapy and location of tumors, do not influence p53 gene mutation rates.

关键词： Gene p53 Esophageal cancer