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Electrostatic-Mediated Intramolecular Cross-Linking Polymers in Concentrated Solutions

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CCS Chemistry 2019年第5期1卷 407-430页

作者： Dao Xiang Xi Chen Lin Tang Bingyin Jiang zhenzhong yang State Key Laboratory of Polymer Physics and Chemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Polymer Science and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Since Kuhn in 1956 first proposed intramolecular cross-linking of isolated single-polymer chains in dilute solutions,the method has been extensively employed to achieve single-chain colloids and tadpole colloids(Janus... 详细信息

关键词： intramolecular cross-linking single-polymer chain colloid electrostatic interaction Janus concentrated solution

Realizing ranged performance in SnTe through integrating bands convergence and DOS distortion

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Journal of Materiomics 2022年第1期8卷 184-194页

作者： Huimei Pang Xiuxiu Zhang Dongyang Wang Rong Huang zhenzhong yang Xiao Zhang Yuting Qiu Li-Dong Zhao School of Materials Science and Engineering Beihang UniversityBeijing100191China Key Laboratory of Polar Materials and Devices(MOE)and Department of Electronics East China Normal UniversityShanghai200062China Beihang School Beihang UniversityBeijing100191China

As a typical IV-VI compound,SnTe has aroused widely attentions in the thermoelectric community due its similar crystal and band structures with ***,both the large number of inherent Sn vacancies and high thermal conductivity result in inferior thermoelectric performance in intrinsic SnTe over a broad *** this work,we successfully improved those disadvantages of SnTe via stepwisely Pb heavily alloying and then In doping.A significantly wide fraction of Pb into SnTe(0-50%)achieves multiple effects:(a)the carrier concentration of SnTe is reduced through decreasing Sn vacancies via alloying high solution Pb atoms in the matrix;(b)the band structure is optimized through promoting the convergence of the two valence bands,simultaneously enhancing the Seebeck coefficient;(c)HAADF-STEM coupled with EDS results illustrate that guest Pb atoms randomly and uniformly occupied Sn atomic sites in the matrix,concurrently strengthening the phonon ***,we introduced indium into Sn_(0.6)Pb_(0.4)Te system to create resonant states further enlarging the power factors at low-medium *** integration of bands convergence and DOS distortion achieves a considerably high ZT_(ave) of~0.67 over the wide temperature range of 300-823 K in(Sn_(0.6)Pb_(0.4))_(0.995)In_(0.005)Te sample.

关键词： Thermoelectric SnTe Sn vacancies Resonant states Average ZT figure

Carbon Fiber Breakage Mechanism in Aluminum(Al)/Carbon Fibers(CFs) Composite Sheet during Accumulative Roll Bonding(ARB) Process

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 167-173页

作者：胡淑芬 SUN zhenzhong SHEN Fanghua DENG Jun 杨卫平杨浩坤 School of Engineering Jiangxi Agricultural UniversityNanchang 330045China School of Mechanical Engineering Dongguan University of TechnologyDongguan 510730China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan 510730China Smart Manufacturing Division Hong Kong Productivity Council78 Tat Chee AvenueHong Kong 5999075China

We put forward a method of fabricating Aluminum(Al)/carbon fibers(CFs) composite sheets by the accumulative roll bonding(ARB) method. The finished Al/CFs composite sheet has CFs and pure Al sheets as sandwich and surface layers. After cross-section observation of the Al/CFs composite sheet, we found that the CFs discretely distributed within the sandwich layer. Besides, the tensile test showed that the contribution of the sandwich CFs layer to tensile strength was less than 11% compared with annealed pure Al sheet. With ex-situ observation of the CFs breakage evolution with-16%,-32%, and-45% rolling reduction during the ARB process, the plastic instability of the Al layer was found to bring shear damages to the CFs. At last, the bridging strengthening mechanism introduced by CFs was sacrificed. We provide new insight into and instruction on Al/CFs composite sheet preparation method and processing parameters.

关键词： Al/CFs composite sheet accumulative roll bonding tensile strength plastic instability carbon fiber breakage

Dielectric and insulating properties of SrTiO_3/Si heterostructure controlled by cation concentration

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Science China(Physics,Mechanics & Astronomy) 2013年第12期56卷 2404-2409页

作者： yang Fang yang zhenzhong LI WenTao LI FengMiao ZHU XueTao GU Lin LEE H.D. SHUBEITA S. XU C. GUSTAFSSON T. GUO JianDong Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Department of Physics and Astronomy Rutgersthe State University of New Jersey

SrTiO3 films with different cation concentration were deposited on Si（001） substrates by oxide molecular beam epitaxy. An amorphous layer was observed at the interface whose thickness depends on the oxygen pressure and the substrate temperature during growth. Although lowering the oxygen vacancy concentration in SrTiO3 led to better insulating performance as indi- cated by the lowered leakage current density of the heterostructure, the dielectric performance was deteriorated because of the thickened interracial layer that dominated the capacitance of SrTiO3/Si heterostructure. Instead of adjusting the oxygen vacan- cy concentration, we propose that controlling the film cation concentration is an effective way to tune the dielectric and insu- lating properties of SrTiO3/Si at the same time.

关键词： oxide heterostructure oxide films film stoichiometry cation concentration interfaciai layer

“井工厂”水平井组勺形井眼轨道设计方法研究

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长江大学学报（自然科学版） 2024年第1期21卷 79-85页

作者：杨振中李杰张恒刘思格赵江林谢鹏党文辉中国石油新疆油田分公司玛湖勘探开发项目部新疆克拉玛依834000 中国石油新疆油田分公司百口泉采油厂新疆克拉玛依834000 中国石油新疆油田分公司工程技术研究院新疆克拉玛依834000

“井工厂”水平井作业模式已成为经济有效开发非常规油气藏的关键技术,但是由于该作业模式作业井眼相对密集,为解决井眼相碰和减小死油区面积问题,开展了水平井组的勺形井眼轨道剖面优化设计方法研究。在进行井眼轨道优化时,先对井场采... 详细信息

“井工厂”水平井作业模式已成为经济有效开发非常规油气藏的关键技术,但是由于该作业模式作业井眼相对密集,为解决井眼相碰和减小死油区面积问题,开展了水平井组的勺形井眼轨道剖面优化设计方法研究。在进行井眼轨道优化时,先对井场采用交错式布井方式,对各水平井的靶前距和造斜点位置进行组合优化设计,确保靶区位置能够控制全区面积,从而构建最佳水平井组勺形井眼轨道剖面。现场应用实例表明,勺形水平井较常规水平井起下钻柱和下套管摩阻虽然略有增加,但不会影响正常钻完井作业。对比常规井眼轨道与勺形井眼轨道的“井工厂”水平井组,在相同造斜率下,勺形井眼能够将靶前位移缩减到0m,有效地减小了死油区面积,并且可以更加有效地规避井眼相碰风险,在开发致密油时,能够提高经济效益。

关键词：勺形水平井 “井工厂” 死油区井眼轨道优化设计

Efficient recovery and enrichment of rare earth elements by a continuous flow micro-extraction system

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Fundamental Research 2022年第4期2卷 588-594页

作者： Zhuo Chen Jifang Yuan Yuhang Dong Haipeng Liu Fuxin Liang zhenzhong yang Yundong Wang Jianhong Xu The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua UniversityBejing 100084China Department of Chemical Engineering and Key Laboratory of Advanced Materiais of Ministry of Education Tsinghua UniversityBeijing 100084China

The excessive exploitation of rare earth elements(REEs)has caused major losses of non-renewable resources and damage to the *** processes of mining and smelting produce massive amounts of wastewater with low concentrations of ***,the enrichment and recovery of low-concentration REEs from wastewater has significant economic and environmental *** this purpose,operation under large phase ratios(the flow rate ratio between the aqueous phase and extractant)is more desirable and economically ***,the traditional REE extraction process suffers from the uneven dispersion of the extractant and the difficulty of phase separation,which leads to long extraction times and large consumption of ***,there is an urgent need to develop a green and efficient technique to extract low concentrations of REEs from *** this work,a droplet-based microfluidic technique was used to continuously extract and recover low-concentration REEs at large phase ***-shaped magnetic Janus nanoparticles were added to the continuous phase as emulifiers to failitate uniform extractant dispersion and rapid phase *** key factors affecting the extraction efficiency,including pH,residence time,and the amount of added Janus nanoparticles,were systematically *** to batch extraction,droplet-based microfluidic extraction with the addition of Janus nanoparticles showed the advantages of a large speific surface area and fast phase separation during ***,the Janus nanoparticles exhibited good emulsification performance after three extraction cycles,In summary,the Janus nanoparticle-stabilized droplet generated by microfluidic methods provides a feasible path for the efficient enrichment and recovery of low-concentration REEs.

关键词： Rare earth elements(REEs) Microfluidics Extraction Magnetic Janus nanoparticle Phase separation

Germanium isotope effect induced guest rattling and cage distortion in clathrates

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Journal of Materiomics 2018年第4期4卷 338-344页

作者： Ran Ang Zhengshang Wang Shang-Fei Wu Pierre Richard zhenzhong yang Lin Gu Gang Mu Jingtao Xu Ning Liu Jun Tang Key Laboratory of Radiation Physics and Technology Ministry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu610064China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610065China Institute of Physics Chinese Academy of SciencesBeijing100190China Collaborative Innovation Center of Quantum Matter Beijing100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing100190China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

Intermetallic clathrates are materials characterized by a large cage structure where guest atoms can move anharmonically,providing these materials exotic thermoelectric ***,the dynamical and atomic nature of the rattling phonons,and their interactions with the electronic structure,are not fully ***,we report that a germanium isotope effect can trigger an inherent guest rattling and cage distortion in clathrate Ba8Ga16Ge30(BGG).Raman-scattering spectroscopy and advanced electron microscopy demonstrate that the atomic germanium isotope effect induces an offcentre rattling at the 6d sites as well as a tetrakaidecahedron deformation which is anisotropic for ntype BGG but isotropic for p-type *** present findings indicate that the large n-type germanium isotope effect arises from the strong electron-phonon coupling,which opens up a novel avenue for manipulating dynamical motions of phonons via atomic isotope engineering.

关键词： Thermoelectric Clathrate Isotope effect Electron-phonon coupling

四川盆地威寒1井奥陶系宝塔组天然气勘探发现及其意义

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石油学报 2024年第9期45卷 1324-1335页

作者：文龙罗冰周刚张本健葛冰飞杨岱林陶佳丽田兴旺马华灵严威史甲航刘常祺聂美怡李淑琦杨振中孙奕婷蒋航宋泽章中国石油西南油气田公司四川成都610051 中国石油西南油气田公司勘探开发研究院四川成都610041 油气资源与工程全国重点实验室中国石油大学(北京)北京102249 四川科力特油气技术服务有限公司四川成都610041

2023年11月1日,威寒1井上奥陶统宝塔组获产气量为9.02×10^(4)m^(3)/d,展示出四川盆地奥陶系白云岩岩溶孔隙型储层较大的勘探潜力。以此为契机,基于威远气田上奥陶统宝塔组沉积相、储层岩性和物性等综合分析,研究了宝塔组天然气的特点... 详细信息

2023年11月1日,威寒1井上奥陶统宝塔组获产气量为9.02×10^(4)m^(3)/d,展示出四川盆地奥陶系白云岩岩溶孔隙型储层较大的勘探潜力。以此为契机,基于威远气田上奥陶统宝塔组沉积相、储层岩性和物性等综合分析,研究了宝塔组天然气的特点及展布特征,立足生、储、盖等多方面条件,总结分析了四川盆地威远地区宝塔组的成藏优势。3大古隆起和3期构造运动控制了四川盆地奥陶系的沉积充填特征,盆地内宝塔组高能滩体环绕川中古隆起呈规模展布。宝塔组发育3类储层,即白云岩岩溶型储层、灰岩岩溶型储层和弱白云石化区断溶体,其中,威寒1井宝塔组主要为白云岩岩溶型储层。奥陶系发育两套成藏组合:威远地区是以斜坡背景为主的上组合成藏富集区块,由志留系、五峰组供烃;而威寒1井缺失上覆盖层,生-储-盖组合类型主要为"下生上储",气源均来自寒武系筇竹寺组。威远地区宝塔组经历了"先油后气"的成藏过程,生油高峰期在晚二叠世,生气高峰期在早侏罗世。受潮缘滩体、构造背景和地层控制,威远气区宝塔组潮缘滩发育大型背斜构造背景下的构造-地层复合气藏。

关键词：四川盆地宝塔组威寒1井天然气勘探碳酸盐岩储层

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Kinetically Controlled Supramolecular Block Copolymer Self-Assembly:Multicolor Photonic Crystal Patterns from a Single Formulation

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CCS Chemistry 2023年第10期5卷 2301-2311页

作者： Shuai Deng Renhua Deng Xi Mao Bijin Xiong Mian Wang Senbin Chen Wolfgang H.Binder Jintao Zhu zhenzhong yang State Key Laboratory of Materials Processing and Die&Mould Technology Key Laboratory of Materials Chemistry for Energy Conversion and Storage(Ministry of Education)School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074 Chair of Macromolecular Chemistry Faculty of Natural Science II(ChemistryPhysicsand Mathematics)Martin Luther University Halle-WittenbergHalle(Saale) Department of Chemical Engineering Tsinghua UniversityBeijing 100084

Photonic crystal(PC)patterns with tunable and changeable nonvolatile structural colors printed from a single ink are of great interest for optical products but have rarely been reported because most inks can only output one respective structural ***,we propose a facile yet effective kinetically controlled self-assembly strategy to address this *** ink formulation containing supramolecular block copolymers(SBCPs)is *** patterns were printed by direct-ink-writing followed by solvent annealing to generate different structural colors by simply controlling the annealing *** self-assembly kinetic regime suggests that different colors result from various kinetically trapped metastable *** turn,the variation in structural color enables“visualization”of the self-assembly ***,we demonstrate that these kinetically trapped structures exhibit different responsive color-change *** addition,this kinetic control strategy can be synergistic with thermodynamic control to extend the color *** study provides a facile yet effective solution for well-designed PC patterns with tunable,responsive,and unfading colors printed from the simplest single-nozzle printer with a single colorless ink,presenting great potential in broad applications,including information storage,encryption,and anti-fake.

关键词： block copolymers self-assembly supramolecules photonic crystals direct write printing kinetics