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Observation of interlayer excitons in trilayer type-Ⅱ transition metal dichalcogenide heterostructures

Nano Research 2022年第10期15卷 9588-9594页

作者： Biao Wu Haihong Zheng Junnan Ding Yunpeng Wang Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University Shenzhen 518057China

Vertically stacked transition metal dichalcogenide(TMD)heterostructures provide an opportunity to explore optoelectronic properties within the two-dimensional *** such structures,spatially indirect interlayer excitons(IXs)can be generated in adjacent layers because of strong Coulomb ***,due to the complexity of the multilayered heterostructure(HS),the capture and study of the IXs in trilayer type-Ⅱ HSs have so far remained ***,we present the observation of the IXs in trilayer type-Ⅱ staggered band alignment of MoS_(2)/MoSe_(2)/WSe_(2) van der Waals(vdW)HSs by photoluminescence(PL)*** central energy of IX is 1.33 eV,and the energy difference between the extracted double peaks is 23 *** confirmed the origin of IX through PL properties and calculations by the density functional theory,we also studied the dependence of the IX emission peak on laser power and ***,the polarization-resolved PL spectra of HS were also investigated,and the maximum polarizability of the emission peak of WSe_(2) reached 11.40%at 6 *** findings offer opportunities for the study of new physical properties of excitons in TMD HSs and therefore are valuable for exploring the potential applications of TMDs in optoelectronic devices.

关键词： transition metal dichalcogenides interlayer exciton type-II band alignment trilayer heterostructure

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Novel Multimode process Soft Sensing Methods Based on the Dynamic Mixture Variational Autoencoder Regression Model 11

Novel Multimode Process Soft Sensing Methods Based on the Dy...

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11th IEEE Data Driven Control and Learning Systems Conference, DDCLS 2022

作者： Cui, Linlin Yao, Le Ge, Zhiqiang Song, Zhihuan Institute of Industrial Process Control College of Control Science and Engineering Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China

ISBN: (数字)9781665496759

ISBN: (纸本)9781665496759

Modern industrial processes with increasing complexity not only contain nonlinear and multi-mode characteristics, but also are commonly the dynamic processes, which brought challenging problems to soft sensor modeling. In order to solve these problems, a dynamic mixture variational autoencoder regression (DMVAER) model is proposed for the nonlinear multi-mode modeling, which is suitable for industrial process quality prediction with multiple complex process characteristics. Furthermore, in order to deal with the problem of semi-supervised data with a large number of unlabeled samples, a semi-supervised dynamic mixture variational autoencoder regression (ssDMVAER) model is proposed, and the corresponding semi-supervised data sequence division method is adopted to make full use of the information in both labeled data and unlabeled data. Finally, in order to verify the feasibility and effectiveness of the proposed methods, the two models are applied to an actual industrial process of methanation furnace. The results show that the proposed methods have superior soft sensing performance than existing methods. © 2022 IEEE.

关键词： Mixtures

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A short review on diffusion coefficients in magnesium alloys and related applications

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Journal of Magnesium and Alloys 2022年第12期10卷 3289-3305页

作者： Hui Shi Yuanding Huang Qun Luo Sarkis Gavras Regine Willumeit-Römer Norbert Hort Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany State Key Laboratory of Advanced Special Steels and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Institute of Product and Process Innovation Leuphana University LüneburgUniversitätsallee 1Lüneburg D-21335Germany

To have a better understand on the change of microstructure via kinetics, the diffusion behavior of Mg alloys is of special interest to researchers. Meanwhile, diffusion coefficients of Mg based alloys can explain and represent their diffusion behavior well. The evolution of experimental and calculated methods for detecting and extracting diffusion coefficients was discussed briefly. The reasonable diffusion data, especially self-diffusion coefficients, impurity diffusion coefficients and inter-diffusion coefficients of Mg alloys, were reviewed in detail serving to design the Mg alloys with higher accuracy. Then the practical applications of diffusion coefficients of Mg alloys were summarized,including diffusional mobility establishing, precipitation simulation and mechanical properties prediction.

关键词： Magnesium alloys Diffusion coefficients Atomic mobility Precipitation Mechanical properties

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Tandem electrocatalytic-catalytic conversion of nitrate and waste polylactic acid to alanine

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Journal of Energy Chemistry 2025年 108卷 694-702页

作者： Teng, Xue Liang, Shaozhen Shi, Kai Chen, Lisong Shi, Jianlin State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical Processes Engineering Center for Sustainable Carbon School of Chemistry and Molecular Engineering East China Normal University Shanghai200062 China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai200050 China Institute of Eco-Chongming Shanghai202162 China

Herein, a tandem electrocatalytic-catalytic method is employed to produce valuable alanine from nitrate and waste polylactic acid (PLA). Initially, two strategies are proposed to enhance the performance of electrocatalytic NO3− reduction reaction (NO3−RR): optimizing NO3− adsorption and accelerating water dissociation by modulating the cathode electrocatalyst. Fe-regulated Co nanosheets (Fe0.33-Co(OH)2 NSs) have been developed as an efficient electrocatalyst, which demonstrate a remarkable Faradaic efficiency (FE) of 98.2%, with a corresponding yield rate of 10.7 mg h−1 cm−2 for NO3−RR to NH3 at −0.1 V vs. RHE. Additionally, ∼95% FEs of NH3 at −200 mA cm−2 have been maintained for >430 h in the alkaline solution. Subsequently, in situ technologies have been utilized to elucidate the NO3−RR pathways, the structure transformation of the electrocatalysts, and the effects of Fe-induced work function reduction and electron enrichment at Co sites on electrocatalytic activity. Finally, alanine is synthesized by using PLA and the generated NH3 as the raw reactants on the Ru/TiO2 catalyst, achieving maximum yield and selectivity of 81.3% and 91.8%, respectively, which provides a novel approach to utilize the nitrogen resource and mitigate plastic pollution. © 2025 Science Press and Dalian institute of Chemical Physics, Chinese Academy of Sciences

关键词： Nanosheets

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Toward the rational design for low-temperature hydrogenation of silicon tetrachloride: Mechanism and data-driven interpretable descriptor

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Chinese Journal of Chemical engineering 2025年第3期 172-184页

作者： Zhe Ding Li Guo Fang Bai Chao Hua Ping Lu Jinyi Chen Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences School of Chemical Engineering University of Chinese Academy of Sciences Hubei Three Gorges Laboratory State Key Laboratory of Petroleum Molecular & Process Engineering

Low-temperature hydrogenation of silicon tetrachloride（STC） is an essential step in polysilicon *** addition of CuCl to silicon powder is currently a commonly used catalytic method and the silicon powder acts as both a reactant and a ***,the reaction mechanism and the structure-activity relationship of this process have not been fully *** this work,a comprehensive study of the reaction mechanism in the presence of Si and Cu3Si was carried out using density functional theory（DFT） combined with experiments,*** results indicated that the ratedetermining step（RDS） in the presence of Si is the phase transition of Si atom,meanwhile,the RDS in the presence of Cu3Si is the TCS-generation *** activation barrier of the latter is smaller,highlighting that the interaction of Si with the bulk phase is the pivotal factor influencing the catalytic *** feasibility of transition metal doping to facilitate this step was further *** Si disengage energy（Ed） was used as a quantitative parameter to assess the catalytic activity of the catalysts,and the optimal descriptor was determined through interpretable machine *** was demonstrated that d-band center and electron transfer play a crucial role in regulating the level of *** work reveals the mechanism and structure-activity relationship for the low-temperature hydrogenation reaction of STC,and provides a basis for the rational design of catalysts.

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3D printing for tissue/organ regeneration in China

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Bio-Design and Manufacturing 2025年第2期8卷 169-242,I0001,I0002页

作者： Chaofan He Jiankang He Chengtie Wu Changshun Ruan Qi Gu Yongqiang Hao Yang Wu Shuo Bai Xiaoxiao Han Liliang Ouyang Jun Yin Hongzhao Zhou Zhuo Xiong Maobin Xie Lei Shao Jing Nie Liang Ma Cijun Shuai Changchun Zhou Xin Zhao Xuetao Shi Mengfei Yu Jiayin Fu Peng Wen Huixia Xuan Yuan Pang Yan’en Wang Yuan Sun Ziqi Gao Abdellah Aazmi Jingbo Zhang Tianhong Qiao Qixiang Yang Ke Yao Mao Mao Jianxin Hao Pinpin Wang Jirong Yang Huawei Qu Xinhuan Wang Xin Liu Shen Ji Shasha Liu Jingke Fu Bingxian Lu Mohan Wu Feng Chen Zihao Zheng Boqing Zhang Muyuan Chai Chaoying Zhang Mouyuan Sun Bo Peng Huayong Yang Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Research Center for Human Tissue and Organ Degeneration Institute of Biomedicine and BiotechnologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Organ Regeneration and Reconstruction State Key Laboratory of Membrane BiologyInstitute of ZoologyChinese Academy of SciencesBeijing 100101China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing TechnologyShanghai 200011China School of Biomedical Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China National Engineering Research Centre for High Efficiency Grinding Hunan UniversityChangsha 410082China Biomanufacturing Center Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China The Fourth Affiliated Hospital of Guangzhou Medical University Guangzhou 511436China School of Biomedical Engineering Guangzhou Medic

As surgical procedures transition from conventional resection to advanced tissue-regeneration technologies,human disease therapy has witnessed a great leap *** particular,three-dimensional(3D)bioprinting stands as a landmark in this setting,by promising the precise integration of biomaterials,cells,and bioactive molecules,thus opening up a novel avenue for tissue/organ *** by the editorial board of Bio-Design and Manufacturing,this review brings together a cohort of leading young scientists in China to dissect the core functionalities and evolutionary trajectory of 3D bioprinting,by elucidating the intricate challenges encountered in the manufacturing of transplantable *** further delve into the translational pathway from scientific research to clinical application,emphasizing the imperativeness of establishing a regulatory framework and rigorously enforcing quality-control ***,this review outlines the strategic landscape and innovative achievements of China in this field and provides a comprehensive roadmap for researchers worldwide to propel this field collectively to even greater heights.

关键词： 3D printing Bioprinting Tissue engineering Regenerative medicine

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Zwitterionic comb-like lipid polymers encapsulating linalool for increasing the fragrance retention time

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Chinese Chemical Letters 2021年第1期32卷 573-576页

作者： Tianlu Zhang Zhiguo Lu Xiangyu Wang Jie Shen Jianze Wang Yunwei Niu Zuobing Xiao Xin Zhang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Shanghai Research Institute of Fragrance and Flavor Industry Shanghai 200232China School of Perfume and Aroma Technology Shanghai Institute of TechnologyShanghai 200233China

Fragrances are widely used in cosmetics,apparel and ***,the rapid evaporation of the aro ma shortens the useful life of the aromatic ***,improving the fragrance retention time of aromatic products and prolonging the service life of aromatic products are the key scientific problems that need to be solved in current aromatic *** this study,zwitterionic comb-like lipid polymers were synthesized to encapsulate the fragrance molecule *** results showed that the zwitterionic comb lipid molecules were capable of encapsulating more linalool than linear lipid *** the same time,the zwitterionic comb-like lipid molecules also limited the slow release rate of the aroma,thereby increasing the fragrance retention time of the nano-fragrance.

关键词： Linalool Zwitterionic comb-like lipid polymers Nano-fragrance Fragrance retention time Slow release

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A-site doped LaFeO3 perovskite for highly active O3 catalytic decomposition

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Materials Today Communications 2024年 40卷

作者： Guan, Jian Lu, Lingling Guo, Yacong Fan, Guijun Yu, Hang Zhu, Qiuyi Ma, Guojun Han, Ning Chen, Yunfa Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Science and Technology on Particle Materials Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of Mechanics Chinese Academy of Sciences Beijing100190 China

Nowadays, the treatment of ozone has become critically important due to the health risks caused by even minimal amount of ozone in the ambient air. In this work, LaFeO3 doped with Mg, Ca, Sr and Ce on A-site are synthesized by sol-gel method and adopted as a highly active ozone decomposition catalyst. The results show that the Ce doped LaFeO3 exhibits the highest catalytic activity with the optimal doping concentration marked as La0.5Ce0.5FeO3. It reaches high conversion efficiency of 97 % and 90 % to 1000 ppm ozone at high weight hourly space velocity of 720,000 and 1440,000 mL g−1 h−1, which is one of the highest in the literature. The distortion of [FeO6] octahedra reached the maximum when the doping amount of Ce was 0.5 as revealed by X-ray diffraction and Rietveld fitting. The high ozone catalytic activity could be assigned to the easy electron loss from eg orbit caused by high crystal field splitting energy, abundant oxygen vacancies resulting from the biggest distortion of [FeO6] octahedra and quick transfer between Fe2+ and Fe3+. © 2024

关键词： Ozone

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In-situ density measurement for plastic injection molding via ultrasonic technology

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Frontiers of Mechanical engineering 2022年第4期17卷 217-228页

作者： Zhengyang DONG Peng ZHAO Kaipeng JI Yuhong CHEN Shiquan GAO Jianzhong FU State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Beijing Institute of Aeronautical Materials Beijing 100095China Haitian Plastics Machinery Group Co. Ltd.Ningbo 315801China

Density variation during the injection molding process directly reflects the state of plastic melt and contains valuable information for process monitoring and ***,in-situ density measurement is of great interest and has significant application *** existing methods,such as pressure−volume−temperature(PVT)method,have the shortages of time-delay and high cost of *** study is the first to propose an in-situ density measurement method using ultrasonic *** analyses of the time-domain and frequency-domain signals are combined in the proposed *** ultrasonic velocity is obtained from the time-domain signals,and the acoustic impedance is computed through a full-spectral analysis of the frequency-domain *** with different process conditions are conducted,including different melt temperature,injection speed,material,and mold *** show that the proposed method has good agreement with the PVT *** proposed method has the advantages of in-situ measurement,non-destructive,high accuracy,low cost,and is of great application value for the injection molding industry.

关键词： ultrasonic measurement melt density in-situ measurement injection molding

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聚乙烯亚胺的抑膨促渗机理

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Journal of Central South University 2024年第2期31卷 317-329页

作者：阳慧芳沙傲阳何正艳吴明瞿军吴晨捷徐志高池汝安 Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central Minzu UniversityWuhan 430074China Key Laboratory for Green Chemical Process of Ministry of Education School of Resources&Safety EngineeringWuhan Institute of TechnologyWuhan 430073China

为解决风化壳淋积型稀土矿(WCE-DREO)原地浸出过程中出现的滑坡和浸出速度慢等问题,研究了聚乙烯亚胺(PEI)对蒙脱石(MMT)和风化壳淋积型稀土矿的抑膨性能及作用机理。随着聚乙烯亚胺浓度的增加,聚乙烯亚胺对蒙脱石和风化壳淋积型稀土矿... 详细信息

为解决风化壳淋积型稀土矿(WCE-DREO)原地浸出过程中出现的滑坡和浸出速度慢等问题,研究了聚乙烯亚胺(PEI)对蒙脱石(MMT)和风化壳淋积型稀土矿的抑膨性能及作用机理。随着聚乙烯亚胺浓度的增加,聚乙烯亚胺对蒙脱石和风化壳淋积型稀土矿的抑膨效果逐渐增强。由0.4%聚乙烯亚胺和2%硫酸铵组成的复合浸出剂与单独使用2%硫酸铵相比,稀土的浸出效率从93.94%提高到95.24%,浸出时间缩短了约33%。聚乙烯亚胺可通过水解产生大量-NH_(3)^(+),从而中和黏土矿物夹层和表面的负电荷,减少静电排斥,削弱黏土矿物的水化和膨胀。PEI可在黏土颗粒上形成一层聚合物膜,改变颗粒表面的亲水性,减少水的侵入。小颗粒在长链PEI的包裹和桥联作用下发生团聚,从而增大了颗粒尺寸,有利于浸出剂的渗入。PEI骨架还能嵌入黏土夹层并挤出夹层水,从而抑制黏土矿物的膨胀。

关键词：聚乙烯亚胺蒙脱石风化壳淋积型稀土矿抑膨促渗

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