Microstructures最新文献

A theoretical investigation on sulfidated nanoscale zero valent iron for removal of cis-DCE and PCE 硫化纳米级零价铁去除顺式二氯乙烷和多氯乙烷的理论研究

Microstructures Pub Date : 2024-08-10 DOI: 10.20517/microstructures.2024.26

Jessica Jein White, Ming Zhou, J. J. Hinsch, William W. Bennett, Yun Wang

{"title":"A theoretical investigation on sulfidated nanoscale zero valent iron for removal of cis-DCE and PCE","authors":"Jessica Jein White, Ming Zhou, J. J. Hinsch, William W. Bennett, Yun Wang","doi":"10.20517/microstructures.2024.26","DOIUrl":"https://doi.org/10.20517/microstructures.2024.26","url":null,"abstract":"The organochlorine contaminants in wastewater can be degraded by using sulfidated nanoscale zero-valent iron. However, the specific role of S dopants and the underlying degradation mechanism are largely unknown. In this study, we applied ab initio molecular dynamics and density functional theory to investigate the remediation mechanism of two chlorinated organic compounds, cis-dichloroethene and tetrachloroethene, focusing on the role of sulfur dopant coverage on the nZVI surface, represented by a stepped Fe(211) facet, and compare it to a flat (110) surface. Our results revealed that low S coverage facilitates the dissociation of the contaminants due to stronger interaction with the iron surface. Conversely, high S coverage initially hinders dissociation but promotes adsorption of the contaminants for later dissociation, suggesting a potential benefit for remediation. By comparing with the water molecule adsorption energies, we demonstrate that S doping enhances selectivity towards these contaminants only at high S coverage. Our theoretical findings, therefore, highlight the importance of optimizing S coverage for effective wastewater treatment using sulfidated nanoscale zero-valent iron.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"11 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141921353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic regulation of color and mechanical properties of silicon nitride ceramics via engineering hollow structures of Eu-enriched secondary phases 通过富含 Eu 的次生相的工程空心结构协同调节氮化硅陶瓷的颜色和机械性能

Microstructures Pub Date : 2024-08-09 DOI: 10.20517/microstructures.2024.15

Ning Liu, Tengfei Hu, Zhengqian Fu, Jingxian Zhang, Y. Duan, Zhen Wang, Fangfang Xu, Shaoming Dong

引用次数: 0

On the thermal expansion of the tetragonal phase of MAPbI3 and MAPbBr3 关于 MAPbI3 和 MAPbBr3 四方相的热膨胀问题

Microstructures Pub Date : 2024-08-09 DOI: 10.20517/microstructures.2024.33

G. Schuck, D. Többens, Susan Schorr

{"title":"On the thermal expansion of the tetragonal phase of MAPbI3 and MAPbBr3","authors":"G. Schuck, D. Többens, Susan Schorr","doi":"10.20517/microstructures.2024.33","DOIUrl":"https://doi.org/10.20517/microstructures.2024.33","url":null,"abstract":"Based on previously published research, the structural response of the tetragonal hybrid perovskite crystal structure of MAPbX3 [MA: [CH3NH3]+, methylammonium; X = I, Br] to thermal expansion is reviewed here. From an averaged crystal structure perspective, the tetragonal perovskite structure of MAPbI3 and MAPbBr3, based on diffraction data, shows apparent Pb-X bond length shortening and apparent shrinkage of the [PbX6] octahedra with increasing temperature. At the same time, these apparent observations, and hence the thermal expansion, are related to the progressive phase transformation towards the cubic structure, as the lattice parameters respond to a shear stress that couples to the order parameters, and this coupling is predicted by group theory and thus aims to explain precisely the apparent negative thermal expansion-like effects. A different picture emerges for the thermal expansion when considering the very localized structure, since neither a shortening of the Pb-X bond lengths nor a shrinking of the [PbX6] octahedra is observed with pair distribution function analysis, and the presence of orthorhombic short-range order in the tetragonal and cubic perovskite structures is assumed in published studies. The compared extended X-ray absorption fine structure studies, which also map the local structure and provide the “true” bond distance, show no lead-halide bond length shortening with temperature. The perpendicular mean square relative displacement has been determined. Therefore, a comparison of the tension and bond expansion effects in both perovskites can be made. In the orthorhombic phase of MAPbI3 and MAPbBr3, positive expansion and negative tension of the lead-halide bond are almost balanced. After transitioning to the tetragonal phase, the equilibrium shifts toward negative tension. This suggests that both hybrid perovskites have tighter lead-halide bonds and less rigid [PbX6] octahedra in the tetragonal phase than in the low temperature perovskite crystal structure.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"49 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141923938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation strategies of electrocatalysts for 5-hydroxymethylfurfural oxidation-assisted water splitting 5- 羟甲基糠醛氧化辅助水分离电催化剂的调制策略

Microstructures Pub Date : 2024-07-24 DOI: 10.20517/microstructures.2023.93

Tongxue Zhang, Shuai Liu, Fumin Wang, Wenxian Liu, Xinyuan He, Qian Liu, Xubin Zhang, Xijun Liu

{"title":"Modulation strategies of electrocatalysts for 5-hydroxymethylfurfural oxidation-assisted water splitting","authors":"Tongxue Zhang, Shuai Liu, Fumin Wang, Wenxian Liu, Xinyuan He, Qian Liu, Xubin Zhang, Xijun Liu","doi":"10.20517/microstructures.2023.93","DOIUrl":"https://doi.org/10.20517/microstructures.2023.93","url":null,"abstract":"To address energy shortages and environmental issues, prioritizing renewable energy development and usage is crucial. Employing renewable sources for water electrolysis offers a sustainable method for hydrogen generation. Reducing the water electrolysis potential is vital for efficient clean energy conversion and storage. Substituting the anodic oxygen evolution reaction in conventional hydrogen production from water electrolysis with the more thermodynamically favorable 5-hydroxymethylfurfural (HMF) oxidation reaction can greatly decrease overpotential and yield the valuable product 2,5-furan dicarboxylic acid. The key to this process is developing effective electrocatalysts to minimize the potential of the HMF electrooxidation-hydrogen production system. Therefore, this review provides a comprehensive introduction to the modulation strategies that affect the electronic and geometric structure of electrocatalysts for HMF oxidation-assisted water splitting. The strategies encompass heteroatom doping, defect projection, interface engineering, structural design, and multi-metal synergies. The catalysts are assessed from various angles, encompassing structural characterization, reaction mechanisms, and electrochemical performance. Finally, current challenges in the catalyst design and potential development of this promising field are proposed.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"30 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141810206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Imaging inter - and intra-particle features in crystalline cathode materials for Li-ion batteries using nano-focused beam techniques at 4th generation synchrotron sources 利用第四代同步辐射源的纳米聚焦光束技术成像锂离子电池晶体阴极材料的粒子间和粒子内特征

Microstructures Pub Date : 2024-07-24 DOI: 10.20517/microstructures.2024.19

Mattia Colalongo, Nikita Vostrov, Isaac Martens, E. Zatterin, Marie-Ingrid Richard, Francois Cadiou, Quentin Jacquet, J. Drnec, Steven J. Leake, Tanja Kallio, Xiaobo Zhu, S. Lyonnard, T. Schulli

{"title":"Imaging inter - and intra-particle features in crystalline cathode materials for Li-ion batteries using nano-focused beam techniques at 4th generation synchrotron sources","authors":"Mattia Colalongo, Nikita Vostrov, Isaac Martens, E. Zatterin, Marie-Ingrid Richard, Francois Cadiou, Quentin Jacquet, J. Drnec, Steven J. Leake, Tanja Kallio, Xiaobo Zhu, S. Lyonnard, T. Schulli","doi":"10.20517/microstructures.2024.19","DOIUrl":"https://doi.org/10.20517/microstructures.2024.19","url":null,"abstract":"The necessity of mapping crystal defects in battery materials after synthesis is crucial in understanding heterogeneity within a single crystal domain and among particles to develop superior crystal quality materials. Numerous imaging techniques have been developed over the past years to study these materials at the nanoscale. However, most of them use electron beams which demand many hours of sample preparation, and they are incompatible with the investigation of batteries under realistic working conditions. Techniques such as Scanning X-ray Diffraction Imaging (Scanning X-ray Diffraction Microscopy) or Bragg Coherent Diffraction Imaging are increasingly available on the latest generation synchrotron sources. Their progressive deployment will allow for a standardized method for imaging crystal lattice imperfections such as lattice tilt and strain in individual particles without any prior sample preparation. In this paper, we exploited Scanning X-ray Diffraction Microscopy to probe the strain variation in single crystals and polycrystalline particles and Bragg Coherent Diffraction Imaging to reconstruct the volume of a single crystal particle. Presented case studies were performed on particles of different active cathode materials ($$ rm{LiNi_{0.6}Mn_{0.2}Co_{0.2}O_{2}} $$ , $$ rm{LiNiO_{2}} $$ and $$ rm{LiMn_{1.5}Ni_{0.5}O_{4}} $$ ); however, these techniques can also be employed on other battery components for a more holistic structural understanding of used materials and (de)lithiation dynamics on the microscale.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"63 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141809341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TiO2-based heterojunctions for photocatalytic hydrogen evolution reaction 基于 TiO2 的异质结用于光催化氢气进化反应

Microstructures Pub Date : 2024-07-17 DOI: 10.20517/microstructures.2024.06

Nan Yang, Tianwei He, Xinqi Chen, Yijun He, Tong Zhou, G. Zhang, Qingju Liu

引用次数: 0

Recent progress of operando transmission electron microscopy in heterogeneous catalysis 操作透射电子显微镜在异相催化领域的最新进展

Microstructures Pub Date : 2024-07-09 DOI: 10.20517/microstructures.2024.03

Fan Zhang, Wei Liu

{"title":"Recent progress of operando transmission electron microscopy in heterogeneous catalysis","authors":"Fan Zhang, Wei Liu","doi":"10.20517/microstructures.2024.03","DOIUrl":"https://doi.org/10.20517/microstructures.2024.03","url":null,"abstract":"As a highly intricate process encompassing multiple length scales, catalysis research evolves into a comprehensive understanding of reaction kinetics across microscopic to atomic dimensions when electron microscopy, particularly the in situ transmission electron microscopy (TEM), emerges to be increasingly relevant. Meanwhile, the absence of effective methodologies for measuring reaction products during catalysis complicates efforts to elucidate the operational state and catalytic activity of the catalyst. With ongoing advancements of refined gas-cell design within TEM and other in situ accessories, diverse methodologies have emerged to ascertain the occurrence of chemical reactions. In this review, we summarized the recent progress of operando TEM while further extending its conceptual boundaries by including newly emerged reaction-detecting approaches capable of bridging microstructure to the reaction process. These methods involve not only traditional ones of product detection, e.g., in situ mass spectrometry and electron energy loss spectroscopy, but also other reaction-correlative characterizations, such as directly imaging reactant molecule, modified in situ reactor for thermogravimetry and temperature-programmed reaction, and TEM image-based microstructure quantification and activity correlation. Applications, inherent challenges, and our perspectives within these operando TEM techniques are deliberated.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"65 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Control of exposed crystal planes of CeO2 enhances electrocatalytic nitrate reduction 控制 CeO2 的裸露晶面可增强硝酸盐的电催化还原能力

Microstructures Pub Date : 2024-07-04 DOI: 10.20517/microstructures.2023.98

Fei Wang, Dan Li, Jian Mao

引用次数: 0

Charting the course of blood flow: vessel-on-a-chip technologies in thrombosis studies 绘制血流轨迹：血栓研究中的芯片血管技术

Microstructures Pub Date : 2024-06-12 DOI: 10.20517/microstructures.2023.106

Jianfang Ren, Zhao Wang, Nixon Du, Wenlong Cheng, L. Ju

{"title":"Charting the course of blood flow: vessel-on-a-chip technologies in thrombosis studies","authors":"Jianfang Ren, Zhao Wang, Nixon Du, Wenlong Cheng, L. Ju","doi":"10.20517/microstructures.2023.106","DOIUrl":"https://doi.org/10.20517/microstructures.2023.106","url":null,"abstract":"Cardiovascular diseases, primarily driven by thrombosis, remain the leading cause of global mortality. Although traditional cell culture and animal models have provided foundational insights, they often fail to capture the complex pathophysiology of thrombosis, which hinders the development of targeted therapies for cardiovascular diseases. The advent of microfluidics and vascular tissue engineering has propelled the advancement of vessel-on-a-chip technologies, which enable the simulation of the key aspects of Virchow’s Triad: hypercoagulability, alteration in blood flow, and endothelial wall injury. With the ability to replicate patient-specific vascular architectures and hemodynamic conditions, vessel-on-a-chip models offer unprecedented insights into the mechanisms underlying thrombosis formation and progression. This review explores the evolution of microfluidic technologies in thrombosis research, highlighting breakthroughs in endothelialized devices and their roles in emulating conditions such as vessel stenosis, flow reversal, and endothelial damage. The limitations and challenges of the current vessel-on-a-chip systems are addressed, and future perspectives on the potential for personalized medicine and targeted therapies are presented. Vessel-on-a-chip technology holds immense potential for revolutionizing thrombosis research, enabling the development of targeted, patient-specific diagnostic tools and therapeutic strategies. Realizing this potential will require interdisciplinary collaboration and continued innovation in the fields of microfluidics and vascular tissue engineering.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"135 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiphase manganese-based layered oxide for sodium-ion batteries: structural change and phase transition 钠离子电池用多相锰系层状氧化物：结构变化和相变

Microstructures Pub Date : 2024-06-11 DOI: 10.20517/microstructures.2024.01

Zhaomeng Liu, Yingying Song, Shizheng Fu, Pengyan An, Mohan Dong, Shuran Wang, Qingsong Lai, Xuan‐Wen Gao, Wen-Bin Luo

{"title":"Multiphase manganese-based layered oxide for sodium-ion batteries: structural change and phase transition","authors":"Zhaomeng Liu, Yingying Song, Shizheng Fu, Pengyan An, Mohan Dong, Shuran Wang, Qingsong Lai, Xuan‐Wen Gao, Wen-Bin Luo","doi":"10.20517/microstructures.2024.01","DOIUrl":"https://doi.org/10.20517/microstructures.2024.01","url":null,"abstract":"Sodium-ion batteries (SIBs) are recognized as a leading option for energy storage systems, attributed to their environmental friendliness, natural abundance of sodium, and uncomplicated design. Cathode materials are crucial in defining the structural integrity and functional efficacy of SIBs. Recent studies have extensively focused on manganese (Mn)-based layered oxides, primarily due to their substantial specific capacity, cost-effectiveness, non-toxic nature, and ecological compatibility. Additionally, these materials offer a versatile voltage range and diverse configurational possibilities. However, the complex phase transition during a circular process affects its electrochemical performance. Herein, we set the multiphase Mn-based layered oxides as the research target and take the relationship between the structure and phase transition of these materials as the starting point, aiming to clarify the mechanism between the microstructure and phase transition of multiphase layered oxides. Meanwhile, the structure-activity relationship between structural changes and electrochemical performance of Mn-based layered oxides is revealed. Various modification methods for multiphase Mn-based layered oxides are summarized. As a result, a reasonable structural design is proposed for producing high-performance SIBs based on these oxides.","PeriodicalId":515723,"journal":{"name":"Microstructures","volume":"16 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141355859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0