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Amorphous Se species anchored into enclosed carbon skeleton bridged by chemical bonding toward advanced K-Se batteries

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Journal of Energy Chemistry 2021年第10期30卷 319-326,I0010页

作者： Li Zhou Yongpeng Cui Dongqing Kong Wenting Feng Xiuli Gao youguo yan Hao Ren Han Hu Qingzhong Xue Zifeng yan Wei Xing State Key Laboratory of Heavy Oil Processing School of Material Science and EngineeringChina University of PetroleumQingdao 266580ShandongChina

Potassium-selenium(K-Se)batteries have attracted significant attention as one of the most promising alternatives of lithium-ion storage systems owing to high energy density and low *** the design of Se-based cathode materials,however,the low utilization rate of active Se and the rapid dissolution of polyselenides seriously weaken the capacity and cycle ***,how to make full use of Se species without loss during the charge and discharge process is the key to design high-performance Se-based *** this paper,a 3 D"water cube"-like Se/C hybrid(denoted as Se-O-PCS)is constructed with the assistance of Na_(2)CO_(3) *** to the abundant carbonate groups(CO_(3)^(2-))originated from the Na_(2)CO_(3) templates,the molten Se species are firmly anchored into the pore of carbon skeleton by strong C-O-Se ***,this unique Se-O-PCS model not only improves the utilization of active Se species,but also can reduce the contact with the electrolyte to inhibit the shuttle effect of ***,flexible carbon skeleton gives Se-O-PCS hybrid a good electrical conductivity and excellent structural ***,the resultant Se-O-PCS hybrid is endowed with an obviously enhanced K-ions storage property.

关键词： Potassium ion storage K-Se battery Se cathode Porous carbon skeleton Na_(2)CO_(3)template

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磁粉粒度对磁体强韧性和磁性能的影响

稀有金属材料与工程 2008年第11期37卷 2034-2036页

作者：于濂清袁永锋燕友果中国石油大学华东山东东营257061 浙江理工大学浙江杭州310018

研究了烧结NdFeB磁体强韧性和磁性能与磁粉粒度的关系。结果表明:磁粉平均粒度从4.0μm减小到2.9μm时,磁体的晶粒尺寸减小,抗弯强度从212MPa增大到312MPa,增大了50%。磁体的Br和(BH)m在磁粉平均粒度为3.3μm时有最佳值。激光粒度分布... 详细信息

研究了烧结NdFeB磁体强韧性和磁性能与磁粉粒度的关系。结果表明:磁粉平均粒度从4.0μm减小到2.9μm时,磁体的晶粒尺寸减小,抗弯强度从212MPa增大到312MPa,增大了50%。磁体的Br和(BH)m在磁粉平均粒度为3.3μm时有最佳值。激光粒度分布表明平均粒度减小时磁体的iHc增大,Br和(BH)m减小,同时导致磁粉中微细颗粒所占的分数增多。当平均粒度增大时,磁粉中大直径颗粒占的分数增多,磁性能均降低。

关键词：粒度钕铁硼磁性能断裂强度

Finite Temperature Magnetism in the Triangular Lattice Antiferromagnet KErTe_(2)

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Chinese Physics Letters 2024年第9期41卷 140-150页

作者： Weiwei Liu Zheng Zhang Dayu yan Jianshu Li Zhitao Zhang Jianting Ji Feng Jin youguo Shi Qingming Zhang Department of Physics Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

After the discovery of the ARECh2(A=alkali or monovalent ions,RE=rare-earth,Ch=chalcogen)triangular lattice quantum spin liquid(QSL)family,a series of its oxide,sulfide,and selenide counterparts has been consistently reported and extensively *** KErTe_(2) represents the initial synthesized telluride member,preserving its triangular spin lattice,it was anticipated that the substantial tellurium ions could impart more pronounced magnetic attributes and electronic structures to this material *** study delves into the magnetism of KErTe_(2) at finite temperatures through magnetization and electron spin resonance(ESR)*** on the angular momentum J after spin-orbit coupling(SOC)and symmetry analysis,we obtain the magnetic effective Hamiltonian to describe the magnetism of Er^(3+)in R3m space *** the mean-field approximation to the Hamiltonian,we can simulate the magnetization and magnetic heat capacity of KErTe_(2) in paramagnetic state and determine the crystalline electric field(CEF)parameters and partial exchange *** relatively narrow energy gaps between the CEF ground state and excited states exert a significant influence on the *** example,small CEF excitations can result in a significant broadening of the ESR linewidth at 2 *** the fitted exchange interactions,although the values are small,given a large angular momentum J=15/2 after SOC,they still have a noticeable effect at finite ***,the heat capacity data under different magnetic fields along the𝑐axis direction also roughly match our calculated results,further validating the reliability of our analytical *** derived parameters serve as crucial tools for future investigations into the ground state magnetism of KErTe_(2).The findings presented herein lay a foundation for exploration of the intricate magnetism within the triangular-lattice delafossite family.

关键词： triangular Hamiltonian magnetization

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晶体生长研究型实验设计与实践

实验技术与管理 2017年第8期34卷 27-29,37页

作者：燕友果张燕周丽霞中国石油大学(华东)理学院山东青岛266580

依据材料科学发展前沿,设计"研究型晶体生长实验设计与实践"的材料制备及生长机理分析实验。实验设计包括实验过程、结构表征及结果分析分析3部分。在此实验基础上,可以对实验内容进行拓展,以满足学生培养中不同层次的需求。教学实践证... 详细信息

依据材料科学发展前沿,设计"研究型晶体生长实验设计与实践"的材料制备及生长机理分析实验。实验设计包括实验过程、结构表征及结果分析分析3部分。在此实验基础上,可以对实验内容进行拓展,以满足学生培养中不同层次的需求。教学实践证明,综合型研究型晶体生长实验有助于学生熟悉晶体生长的基本理论和掌握基本的实验技能,了解学科发展最新动态,从而提升学生的科研能力和综合素质。

关键词：晶体生长实验设计气相沉积法饱和度

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双子表面活性剂自组装及黏度特性实验设计

实验技术与管理 2017年第9期34卷 30-33页

作者：燕友果张燕王攀周丽霞中国石油大学(华东)理学院山东青岛266580

设计了研究型实验——双子表面活性剂自组装增黏特性的实验设计。采用LAMMPS分子动力学模拟软件、VMD可视化软件及Origin绘图软件,构建了双子表面活性剂溶液模型,优化初始构建模型,模拟了其自组装形成蠕虫胶束的过程,并考察了不同剪切... 详细信息

设计了研究型实验——双子表面活性剂自组装增黏特性的实验设计。采用LAMMPS分子动力学模拟软件、VMD可视化软件及Origin绘图软件,构建了双子表面活性剂溶液模型,优化初始构建模型,模拟了其自组装形成蠕虫胶束的过程,并考察了不同剪切流速下的自组装行为和黏度变化。教学实践证明,该实验使学生掌握了LAMMPS分子动力学模拟软件的使用方法,培养了学生的科研素养。

关键词：分子动力学表面活性剂自组装黏度

无机盐对部分水解聚丙烯酰胺溶液黏度影响的实验与理论研究

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中国石油大学学报（自然科学版） 2016年第4期40卷 165-170页

作者：靳彦欣汪庐山王涛郑鑫燕友果刘冰胜利油田石油工程技术研究院山东东营257000 中国石油大学理学院山东青岛266580

采用实验与分子动力学模拟(MD)结合的方法研究无机盐对部分水解聚丙烯酰胺(HPAM)溶液黏度影响的规律及微观机制。结果表明:无机盐对溶液黏度影响较大,其中Ca Cl2和Mg Cl2对溶液降黏作用强于Na Cl,且当Ca Cl2和Mg Cl2浓度相同时Mg Cl2的... 详细信息

采用实验与分子动力学模拟(MD)结合的方法研究无机盐对部分水解聚丙烯酰胺(HPAM)溶液黏度影响的规律及微观机制。结果表明:无机盐对溶液黏度影响较大,其中Ca Cl2和Mg Cl2对溶液降黏作用强于Na Cl,且当Ca Cl2和Mg Cl2浓度相同时Mg Cl2的降黏作用更加明显;当溶液中加入无机盐时,由于盐离子与聚合物中羧酸根基团的静电吸引,使其在聚合物周围形成阳离子层,从而减弱了聚合物分子链上羧酸根基团之间的排斥作用,导致分子链收缩,进而降低溶液的黏度;相比于Na+和Ca2+,Mg2+更易靠近HPAM分子链,对分子链构型及黏度的改变更加明显。

关键词：部分水解聚丙烯酰胺盐溶液静电作用黏度分子动力学模拟

烷烃修饰SiO_2纳米颗粒油/水界面吸附特性的分子动力学模拟

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中国石油大学学报（自然科学版） 2015年第2期39卷 130-136页

作者：罗健辉丁彬燕友果王平美陈海香张军胡松青中国石油集团科学技术研究院北京100083 中国石油大学理学院山东青岛266580

采用分子动力学方法对比研究烷烃修饰前后SiO2纳米颗粒在油/水界面的吸附组装行为,分析其密度分布、界面层厚度、界面张力等参量。结果表明:烷烃修饰后纳米颗粒疏水性增强,能自发地快速向油/水界面扩散运移,并在界面形成致密的组装单层... 详细信息

采用分子动力学方法对比研究烷烃修饰前后SiO2纳米颗粒在油/水界面的吸附组装行为,分析其密度分布、界面层厚度、界面张力等参量。结果表明:烷烃修饰后纳米颗粒疏水性增强,能自发地快速向油/水界面扩散运移,并在界面形成致密的组装单层膜;烷烃修饰纳米颗粒在油/水界面的吸附能够有效降低界面张力,提高水相对油相的携带能力。

关键词：分子动力学模拟 SiO2纳米颗粒修饰烷烃组装界面张力

Surface doping manipulation of the insulating ground states in Ta_(2)Pd_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5)

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Chinese Physics B 2024年第6期33卷 88-93页

作者：江北姚静宇闫大禹郭照芃屈歌星邓修同黄耀波丁洪石友国王志俊钱天 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Tsung-Dao Lee Institute New Cornerstone Science Laboratoryand School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 201210China Hefei National Laboratory Hefei 230088China

Manipulating emergent quantum phenomena is a key issue for understanding the underlying physics and contributing to possible *** we study the evolution of insulating ground states of Ta_(2)Pu_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5) under in-situ surface potassium deposition via angle-resolved photoemission *** results confirm the excitonic insulator character of Ta_(2)d_(3)Te_(5).Upon surface doping,the size of its global gap decreases *** a deposition time of more than 7 min,the potassium atoms induce a metal-insulator phase transition and make the system recover to a normal *** contrast,our results show that the isostructural compound Ta_(2)Ni_(3)Te_(5) is a conventional *** size of its global gap decreases upon surface doping,but persists positive throughout the doping *** results not only confirm the excitonic origin of the band gap in Ta_(2)Pd_(3)Te_(5),but also offer an effective method for designing functional quantum devices in the future.

关键词： excitonic insulator metal–insulator phase transition surface doping angle-resolved photoemission spectroscopy

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交通监理工作精细化管理的实践与思考

建设监理 2007年第4期 17-19页

作者：胡伟燕友国陈小勇湖南省金衢交通咨询监理有限公司湖南长沙410008

精细化管理是一种管理理念和管理技术,应用到工程监理中能起到加强控制和提高质量的作用。文章从邵怀高速公路第二监理处水泥混凝土路面精细化管理的实践出发,初步提出了交通监理企业推行精细化管理的基本思路。

关键词：交通监理精细化管理实践思考