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Effects of hot deformation and in-situ ZrB2 particle on microstructure and tensile performance of AA7085 composite sheets

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Journal of Iron and Steel Research(International) 2024年第7期31卷 1778-1791页

作者： Jiang-jing Wu Xi-zhou Kai Chuang Guan Yu-tao Zhao School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

To provide a new idea to reduce anisotropy for sheets in the thickness direction by microstructure modification and,mean-while,maintain or even enhance tensile performance,the in-situ ZrB2 particle/AA7085 composite sheets with thicknesses of 1,2,3,and 6 mm were *** as-cast grain size was significantly refined by the heterogeneous nucleus of the ZrB2 *** microstructure results show that severe hot deformation converts as-cast disordered microstructure into a sequential microstructure by crushing the remanent phases and matrix into a fiber *** the solid solution and aging heat treatment,the composite sheets exhibit largely recrystallized grains compared with partially recrystallized grains in the matrix sheets,and weak or even free texture exists in the *** grain size in the composite sheets decreases with the increase in thickness *** the thickness range of 1-3 mm,the composite sheets maintain a similar tensile per-formance as that in matrix sheets,while the strength and ductility in the 6-mm-thick composite sheet are improved.

关键词： Composite sheet Grain structure Texture Dislocation Strengthening

Emerging interactively stretchable electronics with optical and electrical dual-signal feedbacks based on structural color materials

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Nano Research 2024年第3期17卷 1837-1855页

作者： Jialin Wang Kai Zhao Changqing Ye Yanlin Song School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing 100190China

The booming development of wearable devices has aroused increasing interests in flexible and stretchable *** mechanosensory functionality,these devices are highly desirable on account of their wide range of applications in electronic skin,personal healthcare,human–machine interfaces and ***,they are mostly limited by single electrical signal feedback,restricting their diverse applications in visualized mechanical *** by the mechanochromism of structural color materials,interactively stretchable electronics with optical and electrical dual-signal feedbacks are recently emerged as novel sensory platforms,by combining both of their sensing mechanisms and ***,recent studies on interactively stretchable electronics based on structural color materials are *** a brief introduction of their basic components(i.e.,stretchable electronics and mechanochromic structural color materials),two types of interactively stretchable electronics with respect to the nanostructures of mechanochromic materials are outlined,focusing primarily on their design considerations and fabrication ***,the main challenges and future perspectives of these emerging devices are discussed.

关键词： stretchable electronics structural color materials interactive sensing mechanochromism dual-signal feedbacks

Influence of toxic substances on dynamical behavior of a delayed diffusive predator-prey model

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International Journal of Biomathematics 2024年第2期17卷 177-200页

作者： Honglan Zhu Xuebing Zhang Hao Zhang Business School Huaiyin Institute of Technology Huai'an 223003P.R.China College of Mathematics and Statistics Nanjing University of Information Science and Technology Nanjing210044 P.R.China jiangsu Key Laboratory of Trafic and Transportation Security Huaiyin Institute of Technology Huaian 223003P.R.China

In this paper,we propose and investigate a delayed diffusive predator-prey model affected by toxic *** first study the boundedness and persistence property of the *** analyzing the associated characteristic equation,we obtain the conditions for the existence of steady state bifurcation,Hopf bifurcation and Turing ***,we also study the Hopf bifurcation induced by the ***,our theoretical results are verified by numerical *** numerical observation results are in good agreement with the theoretically predicted *** and numerical simulations indicate that toxic substances have a great impact on the dynamics of the system.

关键词： Toxicant delay diffusion bifurcation spatial pattern

Alleviative effects of Bacillus coagulans strains on irritable bowel syndrome-unraveling strain specificity through physiological and genomic analysis

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Food Science and Human Wellness 2024年第4期13卷 1845-1855页

作者： Jiang Cao Leilei Yu Jianxin Zhao Hao Zhang Wei Chen Yuzheng Xue Qixiao Zhai State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China National Engineering Research Center for Functional Food Jiangnan UniversityWuxi 214122China Wuxi Translational Medicine Research Center and jiangsu Translational Medicine Research Institute Wuxi Branch Wuxi 214122China Department of Gastroenterology Affiliated Hospital of Jiangnan UniversityWuxi 214122China

The high intraspecies heterogeneity of Baciillus coagulans leads to significant phenotypic differences among different ***,6 *** strains were tested in the present study using an irritable bowel syndrome(IBS)animal model to determine whether the IBS-alleviating effects of *** strains are *** results of this study showed that the ingestion of *** GBI-30,6086,and *** CCFM1041 significantly alleviated IBS symptoms in *** contrast,other *** strains showed no or limited alleviating effects on IBS *** to our experimental results,the two main common features of these strains were as follows:1)The resistance of vegetative cells to bile salts,and 2)ability to synthesize specific lipids and secondary *** strains based on these two indicators may greatly reduce costs and provide a basis for mining new functional *** *** results also suggest that administration of *** could significantly regulate microbiota dysbiosis in animal ***,the close relationships between the gut microbiota,gut microbiota metabolites,and IBS were further confirmed in this study.

关键词： Baciillus coagulans Irritable bowel syndrome Resistance to bile salts Comparative genomic analysis Gut microbiota

维普期刊数据库

A Design of 2-Stage Voltage Ramp-Up SRAM Physical Unclonable Function

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Chinese Journal of Electronics 2024年第2期33卷 371-379页

作者： Minte SONG Nan LIU Shuaiyang ZHOU Zhengguang WANG Zhanqiang RU Peng DING Wei HUANG Helun SONG School of Nano-Tech and Nano-Bionics University of Science and Technology of China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

Silicon physical unclonable function（PUF） implemented by static random access memory（SRAM）exists inherent demerit of unstable cells due to noise of environment and circuits, which significantly restricts its reproducibility. In this paper, a 16T SRAM cell with reset-delay circuit and a 2-stage voltage ramp up is fabricated and reported. Compared to conventional SRAM structure, each PUF cell adds a pair of pull-up PMOS（P-channel metal oxide semiconductor） and pull-down NMOS（N-channel metal oxide semiconductor） controlled by reset and delayedreset signals respectively, resulting in two positive feedback stages with different amplification coefficients when the voltage is ramped up. PUF array consists of 4064 cells, 322 dummy cells and a group of 8 series-connected inverters with an area of 304 μm × 650 μm to match the digital post-processing module. PUF test chip was fabricated in HHGrace 110 nm platform with total area 1140 × 1140 μm2. The average HDintra（intra-chip Hamming distance, also bit error rate, BER） and HDinter（inter-chip Hamming distance） values of the 50 PUF chips in SOP16 package measured at normal point（1.5 V/25 ℃） were 1.92% and 49.85%, respectively.

关键词： Semiconductor device measurement Circuits Bit error rate Metals Aging Physical unclonable function Reproducibility of results

Recent advances in photoelectrochemistry-coupled dual-modal biosensors:From constructions to biosensing applications

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Nano Research 2024年第6期17卷 5512-5528页

作者： Yuxiang Dong Weisa Wang Changqing Ye Yanlin Song School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing 100190Chin

Precise and sensitive bioanalysis has been the major and urgent pursuit in pathologic diagnosis,food safety,environment monitoring,and drug ***(PEC)bioanalysis,as one of the most promising detection technologies,has rapidly expanded within the field of ***,most of reported PEC analysis approaches still suffer from weak external anti-interference ability,high background,and the risk of false positive or negative errors due to their inherent single-signal *** overcome these shortcomings,new PEC-coupled dual-modal analysis approaches have been developed,where a dual-response signal can be derived through two completely different mechanisms and independent signal transduction *** review introduces the basic principles of PEC biosensing and enumerates and classifies the substrate or probe selections,constructions,and applications of PEC-coupled dual-modal ***,the challenges and developmental prospects of PEC-coupled dual-mode sensing technologies are evaluated and *** hope that this review will provide valuable insights into the latest advancements and practical applications of dual-mode PEC bioanalysis,which will be of great interest to those seeking to stay informed in this field.

关键词： photoelectrochemistry biosensor electrochemistry colorimetry electrochemiluminescence fluorescence dual-mode detection

聚苯胺包覆的硫化锌-碳纳米管用作正极载体材料提高锂硫电池性能

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材料导报 2024年第1期38卷 10-16页

作者：周宇祥施天宇赵晨媛尹海宏宋长青郁可南通大学信息科学技术学院江苏南通226019 华东师范大学物理与电子科学学院极化材料与器件教育部重点实验室上海200241

随着石油等化石燃料的逐渐枯竭,人们对绿色能源和电动汽车的需求持续增长,可循环的电能储存系统也得到了快速发展。然而,传统的锂离子电池已接近理论极限,因而寻找开发下一代电池电极材料受到了极大的关注。锂硫电池因为具备出色的理论... 详细信息

随着石油等化石燃料的逐渐枯竭,人们对绿色能源和电动汽车的需求持续增长,可循环的电能储存系统也得到了快速发展。然而,传统的锂离子电池已接近理论极限,因而寻找开发下一代电池电极材料受到了极大的关注。锂硫电池因为具备出色的理论比容量和能量密度、环境友好、成本低廉等优点而备受关注。然而,锂硫电池中活性硫及其放电产物导电性差、可溶性多硫化物在电极间穿梭、体积膨胀等问题导致电池的反应动力学缓慢、容量迅速下降。为了解决这些问题,有必要对硫正极进行合理设计,研究表明引入碳纳米结构(如碳纳米管、碳纳米纤维、介孔碳、石墨烯等)作为骨架负载硫能提高锂硫电池的性能。这些碳骨架具有多层次的交叠多孔结构、大比表面积和高电子迁移率等优势,为离子提供迁移通道的同时能形成物理屏障限制多硫化物的迁移,进而抑制穿梭效应改善电池的循环稳定性。但是由于碳纳米结构的非极性特点,多硫化物与碳骨架之间的相互作用较弱,只能通过物理相互作用抑制多硫化物的穿梭。为了提高抑制效果,可以将极性材料(如金属氧化物、硫化物等)与碳纳米结构进行耦合,这样就兼具了极性材料和碳纳米结构的优点。极性材料与多硫化物的相互作用较强,同时碳纳米结构的高导电性和物理屏障作用亦得以保留,因而能大幅减缓穿梭效应,提高锂硫电池的循环稳定性和倍率性能。此外,多种导电聚合物,如聚吡咯(PPy)、聚噻吩(PTh)和聚苯胺(PANI)等,亦能作为包覆层或导电载体改善锂硫电池的循环性能和倍率性能。其中聚苯胺(PANI)具有导电性高、易合成、共形性好等特点,作为包覆层能有效地防止多硫化物向外扩散,提高电子的迁移率,从而保证电池的长期循环稳定性。本工作制备了一种ZnS-CNTs/S@PANI正极材料来抑制上述缺陷,提高锂硫电池性能,该正极材料以ZnS修饰的CNTs为骨架来负载硫,再在外层包覆聚苯胺(PANI)导电聚合物制备而成。该正极材料中由碳纳米管构成的导电网络有利于电子的快速迁移,并能容纳循环过程中硫的体积膨胀;ZnS量子点的修饰在碳纳米管表面增加了大量极性位点,能够增强对多硫化物的吸附,进而抑制穿梭效应;外侧的聚苯胺作为极性导电包覆层有利于提高电极整体的导电性,增强对多硫化物的吸附,并且能够通过物理限制效应防止活性材料流失。因此该正极材料表现出良好的电池性能,其初始比容量在0.5 C时为952.33 mAh·g^(-1),经过150次循环后比容量为776.37 mAh·g^(-1),容量保持率为81.52%。其在2 C倍率下的放电容量为633.62 mAh·g^(-1),优于CNTs/S和ZnS-CNTs/S电极。该结果证明了ZnS-CNTs/S@PANI正极材料具备优异的锂硫电池性能,为了锂硫电池向实用化发展提供了一种正极制备方案。

关键词：锂硫电池硫化锌正极聚苯胺

Highly elastic energy storage device based on intrinsically super-stretchable polymer lithium-ion conductor with high conductivity

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Fundamental Research 2024年第1期4卷 140-146页

作者： Shi Wang Jixin He Qiange Li Yu Wang Chongyang Liu Tao Cheng Wen-Yong Lai State Key Laboratory of Organic Electronics and Information Displays(SKLOEID) Institute of Advanced Materials(IAM)School of Chemistry and Life SciencesNanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi'an 710072China

Stretchable power sources,especially stretchable lithium-ion batteries(LIBs),have attracted increasing attention due to their enormous prospects for powering flexible/wearable *** recent advances,it is still challenging to develop ultra-stretchable LIBs that can withstand large *** particular,stretchable LIBs require an elastic electrolyte as a basic component,while the conductivity of most elastic electrolytes drops sharply during deformation,especially during large *** is why highly stretchable LIBs have not yet been realized until *** a proof of concept,a super-stretchable LIB with strain up to 1200%is created based on an intrinsically super-stretchable polymer electrolyte as the lithium-ion *** super-stretchable conductive system is constructed by an effective diblock copolymerization strategy via photocuring of vinyl functionalized 2-ureido-4-pyrimidone(VFUpy),an acrylic monomer containing succinonitrile and a lithium salt,achieving high ionic conductivity(3.5×10^(-4)mS cm^(-1)at room temperature(RT))and large deformation(the strain can reach 4560%).The acrylic elastomer containing Li-ion conductive domains can strongly increase the compatibility between the neighboring elastic networks,resulting in high ionic conductivity under ultra-large deformation,while VFUpy increases elasticity modulus(over three times)and electrochemical stability(voltage window reaches 5.3 V)of the prepared polymer *** a strain of up to 1200%,the resulting stretchable LIBs are still sufficient to power *** study sheds light on the design and development of high-performance intrinsically super-stretchable materials for the advancement of highly elastic energy storage devices for powering flexible/wearable electronics that can endure large deformation.

关键词： Stretchable electronics Flexible electronics Flexible energy storage devices Stretchable lithium-ion conductors Flexible lithium-ion batteries

聚苯胺包覆的硫化锌-碳纳米管用作正极载体材料提高锂硫电池性能（英文）

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材料导报 2024年第1期 14-20页

作者：周宇祥施天宇赵晨媛尹海宏宋长青郁可南通大学信息科学技术学院华东师范大学物理与电子科学学院极化材料与器件教育部重点实验室

随着石油等化石燃料的逐渐枯竭，人们对绿色能源和电动汽车的需求持续增长，可循环的电能储存系统也得到了快速发展。然而，传统的锂离子电池已接近理论极限，因而寻找开发下一代电池电极材料受到了极大的关注。锂硫电池因为具备出色的... 详细信息

随着石油等化石燃料的逐渐枯竭，人们对绿色能源和电动汽车的需求持续增长，可循环的电能储存系统也得到了快速发展。然而，传统的锂离子电池已接近理论极限，因而寻找开发下一代电池电极材料受到了极大的关注。锂硫电池因为具备出色的理论比容量和能量密度、环境友好、成本低廉等优点而备受关注。然而，锂硫电池中活性硫及其放电产物导电性差、可溶性多硫化物在电极间穿梭、体积膨胀等问题导致电池的反应动力学缓慢、容量迅速下降。为了解决这些问题，有必要对硫正极进行合理设计，研究表明引入碳纳米结构(如碳纳米管、碳纳米纤维、介孔碳、石墨烯等)作为骨架负载硫能提高锂硫电池的性能。这些碳骨架具有多层次的交叠多孔结构、大比表面积和高电子迁移率等优势，为离子提供迁移通道的同时能形成物理屏障限制多硫化物的迁移，进而抑制穿梭效应改善电池的循环稳定性。但是由于碳纳米结构的非极性特点，多硫化物与碳骨架之间的相互作用较弱，只能通过物理相互作用抑制多硫化物的穿梭。为了提高抑制效果，可以将极性材料(如金属氧化物、硫化物等)与碳纳米结构进行耦合，这样就兼具了极性材料和碳纳米结构的优点。极性材料与多硫化物的相互作用较强，同时碳纳米结构的高导电性和物理屏障作用亦得以保留，因而能大幅减缓穿梭效应，提高锂硫电池的循环稳定性和倍率性能。此外，多种导电聚合物，如聚吡咯(PPy)、聚噻吩(PTh)和聚苯胺(PANI)等，亦能作为包覆层或导电载体改善锂硫电池的循环性能和倍率性能。其中聚苯胺(PANI)具有导电性高、易合成、共形性好等特点，作为包覆层能有效地防止多硫化物向外扩散，提高电子的迁移率，从而保证电池的长期循环稳定性。本工作制备了一种ZnS-CNTs/S@PANI正极材料来抑制上述缺陷，提高锂硫电池性能，该正极材料以ZnS修饰的CNTs为骨架来负载硫，再在外层包覆聚苯胺(PANI)导电聚合物制备而成。该正极材料中由碳纳米管构成的导电网络有利于电子的快速迁移，并能容纳循环过程中硫的体积膨胀；ZnS量子点的修饰在碳纳米管表面增加了大量极性位点，能够增强对多硫化物的吸附，进而抑制穿梭效应；外侧的聚苯胺作为极性导电包覆层有利于提高电极整体的导电性，增强对多硫化物的吸附，并且能够通过物理限制效应防止活性材料流失。因此该正极材料表现出良好的电池性能，其初始比容量在0.5 C时为952.33 mAh·g-1,经过150次循环后比容量为776.37 mAh·g-1,容量保持率为81.52%。其在2 C倍率下的放电容量为633.62 mAh·g-1,优于CNTs/S和ZnS-CNTs/S电极。该结果证明了ZnS-CNTs/S@PANI正极材料具备优异的锂硫电池性能，为了锂硫电池向实用化发展提供了一种正极制备方案。

关键词：锂硫电池硫化锌正极聚苯胺