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Evolution of Crystalline Morphology in Ultrathin Films of Copolyesters with Controlled Rigid Dihydric Alcohol Contents

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Macromolecules 2025年第11期58卷 5610-5617页

作者： Decai Lin Cuiyun Zhang Miao Zhou Shicun Jiang Xinping Wang School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Hangzhou 310018 P. R. China School of Materials Science and Engineering Tianjin University Tianjin 300072 P.R. China

The isothermal crystalline morphology of random copolyesters, PTTxGy, prepared by polycondensation of terephthalic acid with mixtures of 1,3-propylene glycol (1,3-PDO, T) and 1,4-cyclohexanedimethanol (1,4-CHDM, G) in different molar ratios, was studied by atomic force microscopy (AFM). The results show that with an increasing molar ratio of the rigid component (G) in the dihydric alcohol, the size of the lamellar crystals in ultrathin films initially increased, followed by the formation of stacked lamellae, where the number of stacking layers progressively increased. The lamellar thickness also increased from 5.6 nm in PTT (0% G) to 12.2 nm in PTT85G15(15% G) after crystallization at 195 °C. These phenomena are attributed to the inhibition of nucleation in the film with the increase of the G component. Consequently, the crystal size increased, while the crystal density decreased. This further makes the lamellar crystals to nucleate and grow on top of a basal lamellar crystal, forming correlated lamellar crystals. Exclusion of the G component from the crystal results in more tails and loops on the lamellar surface and forms thicker amorphous layers on two sides of the crystal; therefore, the lamellar thickness measured by AFM was increased. The effect of the number of nuclei on the formation of correlated lamellar crystals was further demonstrated through a two-step crystallization procedure. As the number of crystal nuclei increased, the degree of stacking and crystal size decreased until a monolayer of lamellae formed after crystallization at 195 °C. This paper highlights the role of the polymer chemical structure in the resulting crystalline morphology of ultrathin films.

关键词： Ultrathin films

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原子级精准调控非晶硫化物上Ru位点用于高效析氢反应（英文）

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science China materials 2025年

作者：王兰芳李宇嘉郝艳青左路阳赵嘉赫刘文娇张惠刘洋雷占武许小红 School of Chemistry and Materials Science Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education Shanxi Normal University Research Institute of Materials Science Shanxi Key Laboratory of Advanced Magnetic Materials and Devices Shanxi Normal University Department of Materials Science Fudan University Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China

将Ru单原子锚定在合适的载体上可有效调控材料电子状态,从而显著提升材料析氢性能.本研究通过一步水热合成法,成功制备了Ru单原子及亚1 nmRu簇锚定的非晶FeMoSx（Ru-FMSx）纳米片催化剂.通过调控亚1 nmRu簇与非晶态FMSx之间的界面相互作...

将Ru单原子锚定在合适的载体上可有效调控材料电子状态,从而显著提升材料析氢性能.本研究通过一步水热合成法,成功制备了Ru单原子及亚1 nmRu簇锚定的非晶FeMoSx（Ru-FMSx）纳米片催化剂.通过调控亚1 nmRu簇与非晶态FMSx之间的界面相互作用,可有效调节Ru的电子结构,降低氢吸附与脱附的能垒,促进羟基中间体的生成与释放,从而改善析氢反应（HER）的缓慢动力学.因此,Ru-FMSx电催化剂在碱性条件下仅需34 mV的过电位即可实现10 mA cm-2的电流密度,展现出卓越的HER活性.此外,该催化剂在10 mA cm-2电流密度下连续运行200 h后,析氢法拉第效率仍保持在97%以上,表现出优异的长期稳定性.卓越的析氢稳定性归因于材料中独特的非晶结构以及缩短的Mo–S和Fe–S键长.这一发现为非晶硫化合物以及单原子高效析氢催化剂的设计与应用提供了一种简便策略.

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Temperature-dependent synergistic evolution mechanism of rhenium and irradiation defects in tungsten-rhenium alloys

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Journal of materials science & Technology 2023年第14期145卷 221-234页

作者： Yu-Hao Li Fang-Ya Yue Zhong-Zhu Li Peng-Wei Hou Yu-Ze Niu Hui-Zhi Ma Ying Zhang Xun-Xiang Hu Hui-Qiu Deng Hong-Bo Zhou Fei Gao Guang-Hong Lu Department of Physics Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China College of Physics Sichuan UniversityChengdu 610065China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Nuclear Engineering and Radiological Science University of MichiganAnn ArborMI 48109USA

We have systemically investigated the synergistic evolution of rhenium(Re)and irradiation defects in tungsten(W)-Re alloys under different temperatures and irradiation doses using object Kinetic Monte Carlo *** results revealed the underlying mechanism for the transition of Re effect on W from beneficial to harmful during the Re-defects evolution with the increase of irradiation dose,in which tem-perature always plays a critical *** the one hand,Re will significantly promote the defect annihila-tion at low irradiation doses and high temperatures,thereby effectively reducing their sizes and number *** is due to the formation of stable Re-SIAs complexes that can be eliminated by the mobile vacancy-type defects,whereas the transition of the migration pattern of SIAs only plays a weak role in the defect recombination in W-Re *** the other hand,with the increase of irradiation dose,Re will aggregate to form Re-rich clusters or even ***,the formation mechanism of Re-rich clusters is also dependent on *** low temperatures,the interstitial-mediated mech-anism plays a crucial role in the Re-rich cluster formation,while at high temperatures,both SIA-type and vacancy-type defects will act as the transport carriers of Re to promote their ***,the critical conditions for the transition of Re from beneficial to harmful and the formation of Re-rich clusters at different tem peratures and irradiation doses are given with the help of the phase *** work presents the temperature dependence of the synergy of Re and irradiation defects in W-Re in fusion-relevant environment,which provides a good reference for the development of radiation-resistant materials and the prediction of W performance in fusion reactors.

关键词： Synergistic evolution Irradiation defects Defects recombination Rhenium-rich clusters Tungsten-rhenium alloys

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超薄蛭石纳米片基人工界面层调控Zn^(2+)离子通量助力高性能锌金属负极

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science Bulletin 2023年第12期68卷 1283-1294,M0004页

作者：李建文周双孟欣雨陈逸宁傅纯雁 Alireza Azizi 赵晓光解维闵常智潘安强 School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

水系锌离子电池因其成本低、安全性高成为了近年来的研究热点,然而循环过程中的枝晶生长和界面腐蚀等问题严重限制了此类电池的实际应用。本文利用超薄蛭石纳米片(Vermiculite sheets,VS)在锌金属负极表面制备了具有核壳结构的多功能离... 详细信息

水系锌离子电池因其成本低、安全性高成为了近年来的研究热点,然而循环过程中的枝晶生长和界面腐蚀等问题严重限制了此类电池的实际应用。本文利用超薄蛭石纳米片(Vermiculite sheets,VS)在锌金属负极表面制备了具有核壳结构的多功能离子整流器(Ionrectifier,IRT)人工界面层.其中,疏水性聚偏二氟乙烯(PVDF)外壳能够将H_(2)O从锌负极表面驱离,赋予其优异的抗腐蚀效率(94.8%);VS内核的天然负电层间能够促进Zn^(2+)的迁移动力学(t_(+)=0.79)和密实沉积.结果表明,锌负极的电化学稳定性和沉积一致性大大提高,即使在高电流密度(3mA cm^(-2))下,IRT保护下的锌负极仍能稳定工作1600小时以上,并获得2400mAh cm^(-2)的累积放电容量.同时,利用该人工界面层组装的Zn//NH_(4)V_(4)O_(10)软包电池在1Ag^(-1)下循环150圈后的容量保持率高达94.3%.这种低成本、高效率的负极界面改性策略为水系电池的商业化提供了可能。

关键词：锌负极锌离子电池电化学稳定性放电容量整流器软包电池循环过程锌金属

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Suppressing by-product via stratified adsorption effect to assist highly reversible zinc anode in aqueous electrolyte

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Journal of Energy Chemistry 2021年第4期30卷 549-556页

作者： Miao Zhou Shan Guo Guozhao Fang Hemeng Sun Xinxin Cao Jiang Zhou Anqiang Pan Shuquan Liang School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083HunanChina

The development of promising zinc anodes mainly suffers from their low plating/stripping coulombic efficiencies when using aqueous electrolyte,which are mainly associated with the interfacial formation of irreversible *** is urgent to develop technologies that can solve this issue ***,we report an artificial Sc_(2)O_(3) protective film to construct a new class of interface for Zn *** density functional theory simulation and experimental results have proven that the interfacial side reaction was inhibited via a stratified adsorption effect between this artificial layer and Zn *** from this novel structure,the Sc_(2)O_(3)-coated Zn anode can run for more than 100 cycles without short circuit and exhibit low voltage hysteresis,and the coulombic efficiency increases by 1.2%.Importantly,it shows a good application prospect when matched with two of popular manganese-based and vanadium-based *** excellent electrochemical performance of the Sc_(2)O_(3)-coated Zn anode highlights the importance of rational design of anode materials and demonstrates a good way for developing high-performance Zn anodes with long lifespan and high efficiency.

关键词： Zn anode Artificial protective film Stratified adsorption Interfacial reaction Zn4SO4(OH)6·H2O by-products

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Local Excitation of Kagome Spin Ice Magnetism Seen by Scanning Tunneling Microscopy

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Physical Review Letters 2024年第4期133卷 046503-046503页

作者： Hanbin Deng Tianyu Yang Guowei Liu Lu Liu Lingxiao Zhao Wu Wang Tiantian Li Wei Song Titus Neupert Xiang-Rui Liu Jifeng Shao Y. Y. Zhao Nan Xu Hao Deng Li Huang Yue Zhao Liyuan Zhang Jia-Wei Mei Liusuo Wu Jiaqing He Qihang Liu Chang Liu Jia-Xin Yin Department of Physics Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Shenzhen Institute for Quantum Science and Engineering Institute for Advanced Studies School of Physical Science and Technology Guangdong Provincial Key Laboratory of Computational Science and Material Design

The kagome spin ice can host frustrated magnetic excitations by flipping its local spin. Under an inelastic tunneling condition, the tip in a scanning tunneling microscope can flip the local spin, and we apply this technique to kagome metal HoAgGe with a long-range ordered spin ice ground state. Away from defects, we discover a pair of pronounced dips in the local tunneling spectrum at symmetrical bias voltages with negative intensity values, serving as a striking inelastic tunneling signal. This signal disappears above the spin ice formation temperature and has a dependence on the magnetic fields, demonstrating its intimate relation with the spin ice magnetism. We provide a two-level spin-flip model to explain the tunneling dips considering the spin ice magnetism under spin-orbit coupling. Our results uncover a local emergent excitation of spin ice magnetism in a kagome metal, suggesting that local electrical field induced spin flip climbs over a barrier caused by spin-orbital locking.

关键词： Electrical properties Magnetism Spin ice Scanning tunneling microscopy Scanning tunneling spectroscopy Two-level models

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Implementation of a low-code monitoring system for solid oxide fuel cells 4

Implementation of a low-code monitoring system for solid oxi...

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4th International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2023

作者： Sun, BenBen Guan, WanBing Wang, JianXin Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo China Key Laboratory of Advanced Fuel Cells and Electrolyzers Cell Technology of Zhejiang Province Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo China

ISBN: (纸本)9781510666412

Solid oxide fuel cells (SOFCs) have the advantages of high conversion efficiency, low working noise, and environmental protection. Thus, they are widely used in large-scale power generation, combined heat power, peak load-regulating energy storage, and other fields. In the actual working process of SOFCs, the battery performance will decline sharply due to extreme conditions such as overtemperature and peroxide, and the service life will be terminated. Remote monitoring of fuel cells can detect problems in time and restore the battery’s performance by restoring the battery, thereby extending its service life. The data generated by fuel cells during operation have a strong temporal correlation. To discover the future state of fuel cells in time and solve the problem that a large number of codes are needed for monitoring, this paper designs a remote monitoring system of fuel cells with low-code based on Node-RED and Ali Cloud. The output current of fuel cells is predicted by using the improved back propagation neural network based on Levenberg-Marguardt (LM-BPNN) algorithm. The test result of LM-BPNN shows that the test samples have a root mean square error of 0.172, a mean absolute percentage error of 3.85%, and a coefficient of determination of 0.998. © 2023 SPIE.

关键词： Digital storage

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Cone Angle Modulation of Silicon Nanocones through Double Etching Processes in Metal-Assisted Chemical Etching 4

Cone Angle Modulation of Silicon Nanocones through Double Et...

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2022 4th International Conference on advanced materials and Ecological Environment, AMEE 2022

作者： Chen, Hui Bian, Chenyu Zhang, Cheng Wang, Shaojun Zhang, Bingchang School of Optoelectronic Science and Engineering Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province Key Laboratory of Modern Optical Technologies of Education Ministry of China Soochow University Jiangsu Suzhou215006 China Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Jiangsu Suzhou215123 China

All-wet metal-assisted chemical etching (MACE) has been demonstrated as a simple and effective method to fabricate silicon nanocones (SiNCs). The properties of SiNCs strongly depend on their structure parameters such as the cone angle and can be optimized through modulating the cone angle. However, cone angle modulation of SiNCs in all-wet MACE processes has not been achieved. Here, we report the fabrication of SiNCs with different cone angles through double etching processes in all-wet MACE. Large-size silver nanoparticles (AgNPs) were first obtained by solution deposition. After a common etching process, a double etching process with diluted etching solutions was introduced. In the etching step, AgNPs gradually reduced with the Si etching, which resulted in the formation of SiNCs. The cone angles of SiNCs depend on the changing rate of AgNP sizes. Based on this mechanism, SiNCs with different cone angles from 5°-20° were successfully fabricated by changing the concentration of the diluted etching solution in the double etching process. The contact angle of SiNCs with different cone angles was also investigated. It is found that the wettability of the SiNCs becomes poorer with increasing cone angles. Cone angle modulation of SiNCs in all-wet MACE will benefit the property control and the wide applications of SiNCs. © Published under licence by IOP Publishing Ltd.

关键词： Silicon

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Influences of different Zr/Sc ratios on microstructure and mechanical properties of Al-2Si alloy

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Journal of Rare Earths 2021年第1期39卷 105-112,I0004页

作者： Qinglin Li Xiaodong Ma Binqiang Li Jiqiang Ma Xiangyu Feng Ruijie Pei Jianjun Liu School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The influences of different Zr/Sc ratios on the microstructural evolution and mechanical performances of Al-2 Si alloy were investigated in this *** as-cast samples were characterized and analyzed by the scanning electron microscope(SEM)with an energy dispersive spectrometer(EDS)to indicate the refining effect of the different Zr/Sc ratios on theα-Al and Si phases in Al-2 Si *** results indicate that theα-Al phases are refined from coarse dendritic structure to relatively fine equiaxed grains when the Zr/Sc ratio is equal to 1:***,the eutectic Si phase in Al-2 Si-0.2 Zr-0.2 Sc alloy is modified from the coarse plate and needle to fine fiber and partial granular structure,and the average roundness of eutectic Si is decreased by 75%from 16 to *** the refinement ofα-Al phases and the modification of eutectic Si structure,the ultimate tensile strength(UTS)is improved by 53%and the elongation(EL)is increased by 64%when the Zr/Sc ratio is equal to 1:*** addition,the UTS decreases and EL is enhanced with the increase of tensile ***,the fracture model of Al-2 Si-0.2 Zr-0.2 Sc alloy in250℃changes into the ductile fracture.

关键词： Al-Si alloy Zr/Sc ratio α-Al phases Eutectic Si Mechanical properties Rare earths

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Local atomic structure evolution of liquid gadolinium and yttrium during solidification:An ab initio study

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Journal of Rare Earths 2023年第8期41卷 1265-1271,I0006页

作者： Qinghe Zheng Tao Hu Sébastien Le Roux Musen Li Chaoyue Chen Jianbo Yu Jiang Wang Wei Ren Zhongming Ren State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringDepartment of PhysicsInternational Center of Quantum and Molecular StructuresShanghai UniversityShanghai200444China University of Strasbourg Institut de Physique et Chimie des Matériaux de StrasbourgCNRSUMR 750423 rue du LoessStrasbourgF-67034France

Local atomic structure evolution of pure gadolinium(Gd)and yttrium(Y)during solidification was investigated by using ab initio molecular dynamics(AIMD)*** calculated results indicate that the local short-range order(SRO)in liquid Gd and Y is similar to some transitional metals with an asymmetric shape of the second peak in static structure ***,the formation of icosahedral local motifs as a function of temperature decreases the diffusivity,which explains the connection between structure evolution and dynamic *** examining the topological structures of both systems,we demonstrate that small atomic displacement leads to two different types of topological sixfold rings in liquid and solid *** analyses yield a systematic study about rare earth metals Gd and Y at the atomic level.

关键词： Atomic structure evolution Rare earth Ab initio molecular dynamics Solidification

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