检索结果-南通市图书馆

Recent progress in single-atom nanozymes research

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 1878-1889页

作者： Bing Jiang Zhanjun Guo Minmin Liang Experimental center of Advanced materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Single-atom nanozyme(SAzyme)is the hot topic of the current nanozyme research.Its intrinsic properties,such as high activity,stability,and low cost,present great substitutes to natural enzymes.Moreover,its fundamental characteristics,i.e.,maximized atom utilizations and well-defined geometric and electronic structures,lead to higher catalytic activities and specificity than traditional nanozymes.SAzymes have been applied in many biomedical areas,such as anti-tumor therapy,biosensing,antibiosis,and anti-oxidation therapy.Here,we will discuss a series of representative examples of SAzymes categorized by their biomedical applications in this review.In the end,we will address the future opportunities and challenges SAzymes facing in their designs and applications.

关键词： single-atom nanozymes natural enzymes enzyme-like activity biomedical applications

热电Bi_(0.5)Sb_(1.5)Te_(3)中扩散屏蔽层材料的筛选

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China materials 2024年第1期67卷 289-294页

作者：刘敏李文裴艳中 Interdisciplinary materials Research center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Bi2Te3基热电发电器件作为低品位余热回收应用中唯一商业化的热电器件,通常使用镍作为电极.Bi2Te3/Ni的界面处常形成镍碲化合物,Bi_(2)Te_(3)基热电器件以及其他热电器件长期服役的稳定性主要取决于热电材料与电极界面处的长期稳定性(... 详细信息

Bi2Te3基热电发电器件作为低品位余热回收应用中唯一商业化的热电器件,通常使用镍作为电极.Bi2Te3/Ni的界面处常形成镍碲化合物,Bi_(2)Te_(3)基热电器件以及其他热电器件长期服役的稳定性主要取决于热电材料与电极界面处的长期稳定性(尤其是热端),热电材料与电极之间引入扩散屏蔽层在热电器件的转换效率和服役稳定性方面发挥着重要作用.本工作从13种金属中筛选出Ti作为p型Bi_(0.5)Sb_(1.5)Te_(3)热电材料与Ni电极之间的阻挡层材料.由于Ti在Bi_(0.5)Sb_(1.5)Te_(3)中具有低扩散系数和长期界面稳定性,p型Bi_(0.5)Sb_(1.5)Te_(3)/Ti/Ni单腿器件在200 K温差下转换效率大于6%,并且在持续10天的近1900次转换效率测试中未发生衰减.这为制备高效耐用的热电器件提供了一种实用的策略.

关键词：热电器件热电材料 Bi2Te3 转换效率界面稳定性碲化合物屏蔽层电极界面

Dynamically responsive photonic metal–organic frameworks

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2023年第5期5卷 7-25页

作者： He-Qi Zheng Lin Zhang Yuanjing Cui Guodong Qian Zhejiang University School of Materials Science and EngineeringCyrus Tang Center for Sensor Materials and ApplicationsState Key Laboratory of Silicon Materials and Advanced Semiconductor MaterialsHangzhouChina

Different from single and static photonic materials,dynamically responsive materials possess numerous advantages,such as being multifunctional,dynamically responsive,and able to provide multiple channels within spatially limited platforms,thus exhibiting great potential for application in the color-on-demand areas,including imaging,optical displays,anticounterfeiting,and encoding.Photonic functional metal–organic frameworks(MOFs),with highly designable framework structures and varieties of optical functional building units,possess broad research and application prospects in the field of photonics,which make it possible to design a promising platform with multifunctional and integrated photonic performance.In this review,beyond the preparation strategies of stimuli-responsive photonic MOFs,we also summarize the stimuli-responsive photonic MOFs regarding several most representative types of external stimuli(such as light,gas,pressure,and polarization).As shown,external stimulation endows the stimuli-responsive photonic MOFs with intriguing regulatable photonic properties:intensive and tunable emission,multiphoton-excitable luminescence,nonlinear optical,circularly polarized luminescence,lasing,etc.Furthermore,their advanced representative applications,such as information encryption and anticounterfeiting display,biological imaging,chemosensing,and others,are also reviewed.The challenges are proposed and the prospects are addressed.

关键词： stimuli-responsive photonic properties switchable materials photochromic molecules metal-organic frameworks

Significant influence of trace Li on the mechanical properties, corrosion behavior, and antibacterial properties of biodegradable Zn–4Cu alloys

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2023年第20期151卷 245-257页

作者： Shiyu Huang Heng Liu Yanjing Su Lijie Qiao Yu Yan Beijing Advanced Innovation Center for Materials Genome Engineering Corrosion and Protection CenterInstitute for Advanced Materials and TechnologyUniversity of Science and TechnologyBeijing 100083China

In this work,trace Li was introduced to strengthen Zn–4Cu alloys.The results indicated that trace amounts of Li contributed to a significant increase in strength,resulting in an acceptable loss of elongation at fracture.Additionally,Li in the form of LiZn_(4) led to more intensive galvanic corrosion,which accelerated the early corrosion rate.The release of a large amount of Zn^(2+),caused by the addition of Li,affected the phase composition of the main Zn-containing corrosion products.Moreover,the inhibition effect of the alloy on Staphylococcus aureus(S.aureus)was enhanced by the addition of 0.02 wt.%Li.

关键词： Microalloying Zn-Cu alloy LiZn_(4)/Zn pairs Biodegradable mechanism SKPFM

A first-principles investigation on mechanical and metallic properties of titanium carbides under pressure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2018年第10期34卷 1953-1958页

作者： Xiaojing Sha Namin Xiao Yongjun Guan Xiaosu Yi materials Genome center Beijing Institute of Aeronautical Materials

The titanium carbides are potential candidates to achieve both high hardness and refractory property. We carried out a structural search for titanium carbides at three pressures of 0 GPa, 30 GPa and 50 GPa. A phase diagram of the Ti-C system at 0 K was obtained by elucidating formation enthalpies as a function of compositions, and their mechanical and metallic properties of titanium carbides were investigated sys- tematically. We also discussed the relation of titanium concentration to the both mechanical and metallic properties of titanium carbides. It has been found that the average valence electron density and tractil-ity improved at higher concentrations of titanium, while the degree of covalent bonding directionality decreased. To this effect, the hardness of titanium carbide decreases as the content of titanium increases. Our results indicated that the titanium content significantly affected the metallic properties of the Ti-C system.

关键词： First-principles calculation Transition metal carbides Mechanical property and hardness High pressure phase stability

Design of efficient thermoelectric generators

在线全文

学校读者我要写书评

暂无评论

Science China materials 2024年第1期67卷 377-378页

作者： Min Liu Yanzhong Pei Interdisciplinary materials Research center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Thermoelectricity,which enables direct conversion between heat and electricity,undergoes impressive developments in recent decades,and is particularly promising for recovering low-grade heat of<600 K[1,2].Currently,only Bi2Te3-based thermoelectric devices are commercialized[3].However,the scarcity of tellurium(Te)(Fig.1a)is the main concern.This leads to numerous recent efforts on the development of efficient nonBi2Te3 thermoelectrics as potential alternatives,and successful examples(Fig.1b)include Mg3Sb2-alloys[2,3]and MgAgSb[1,2].

关键词： enable efficient electricity

Anomalous displacement reaction for synthesizing above-room-temperature and air-stable vdW ferromagnet PtTe2Ge1/3

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第1期10卷 236-245页

作者： Wenxuan Zhu Cheng Song Qian Wang Hua Bai Siqi Yin Feng Pan Key Laboratory of Advanced materials School of Materials Science and Engineering Beijing Innovation Center for Future Chips Tsinghua University

Emerging van der Waals(vdW) magnets provide a paradise for the exploration of magnetism in the ultimate two-dimensional(2D) limit,and the construction of integrated spintronic devices,and have become a research frontier in the field of low-dimensional materials.To date,prototypical vdW magnets based on metals of the first transition series(e.g.V,Cr,Mn and Fe) and chalcogen elements suffer from rapid oxidation restricted by the Hard-Soft-Acid-Base principle,as well as low Curie temperatures(TC),which has become a generally admitted challenge in 2D spintronics.Here,starting from air-unstable Cr2Ge2Te6vdW thin flakes,we synthesize Ge-embedded PtTe2(namely PtTe2Ge1/3) with superior air stability,through the displacement reaction in the Cr2Ge2Te6/Pt bilayer.In this process,the anomalous substitution of Cr with Pt in the thermal diffusion is inverse to the metal activity order,which can be attributed to the compatibility between soft-acid(Pt) and soft-base(Te) elements.Meanwhile,the layered uniform insertion of Ge unbalances Pt-Te bonds and introduces long-range ordered ferromagnetism with perpendicular magnetic anisotropy and a Curie temperature above room temperature.Our work demonstrates the anti-metal-activity-order reaction tendency unique in 2D transition-metal magnets and boosts progress towards practical 2D spintronics.

关键词： vdW magnets room-temperature ferromagnetism air stability HSAB PtTe2Ge1/3

Precise phase adjustment and antibacterial property of copper sulfide particles in confined mesoporous silica nanoreactor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第2期85卷 113-121页

作者： Shiyu Xu Jinyong Wu Zhongzhen Ren Dechao Niu Low Dimensional materials Chemistry Laboratory Key Laboratory for Ultrafine Materials of Ministry of EducationFrontier Science Center of the Materials Biology and Dynamic ChemistryShanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China

Bacteria-caused wound infection greatly threatens human health,thus developing an efficient and safe antibacterial agent without drug resistance is still a great challenge.Herein,a confined vulcanization strategy is proposed to construct copper sulfides-loaded dual-mesoporous silica nanospheres(Cux-Sy@DMSNs)with various crystal phases for reactive oxygen species(ROS)-mediated and photothermal antibacterial application.With the pore confinement of DMSNs,the crystal phases of copper sulfides including CuS,Cu_(9)S_(5)and Cui.96S can be easily controlled by changing the vulcanization temperature.The relationships between the crystal phases and photothermal properties as well as peroxidase-like activity of copper sulfides were systematically investigated.Results show that the obtained CuS@DMSNs exhibited higher photothermal ability with remarkable photothermal conversion efficiency of 36.86%in the second near-infrared region(NIR-II)and better peroxidase-like activity,compared to those of Cu_(9)S_(5)@DMSNs and Cu_(1.96)S@DMSNs.As a result,the in vitro experiments showed the good antibacterial effect against both gram-negative E.coli and gram-positive S.aureus under 1064 nm laser irradiation and the presence of H_(2)O_(2).Besides,the CCK-8 assay indicated that CuS@p-DMSNs have minimal cytotoxicity against normal human umbilical vein endothelial cells at the ranged concentrations.Therefore,the resultant CuS@p-DMSNs could act as a promising antibacterial agent for deep wound bacterial infection treatment.

关键词： Copper sulfides Mesoporous silica Photothermal Reactive oxygen species Antibacterial agent

Superomniphobic surfaces for easy-removals of environmentalrelated liquids after icing and melting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 3267-3277页

作者： Lizhong Wang Ze Tian Xiao Luo Changhao Chen Guochen Jiang Xinyu Hu Rui Peng Hongjun Zhang Minlin Zhong Laser materials Processing Research center Key Laboratory for Advanced Materials Processing Technology(Ministry of Education)Joint Research Center for Advanced Materials&Anti-icing of Tsinghua University(SMSE)-AVIC ARISchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Superhydrophobic surfaces often lose the easy-removal ability of liquids during icing&melting cycles due to the impalement phenomena of air pockets.Especially for the most common mixed liquids in normal life,their difficult-removals after icing and melting have brought colossal troubles in the fields of aviation,energy,biomedicine,etc.Here we adopt the ultrafast laser to fabricate the optimal micro-nanostructured surfaces,realizing excellent superomniphobicity for seven environmental-related liquids.It is demonstrated that different droplets on the surfaces recover well to the original Cassie-Baxter state after melting,and can be removed easily at low tilted angles.The ice adhesion strengths of the seven liquids as low as 5 kPa and the micro-nanostructure durability ensure the long-term easy-removal after icing.Compared with the ice adhesion strength of untreated surfaces(264.4±17.6 kPa),those of our designed surfaces have decreased by over 50 times.Icing and melting processes are investigated to reveal the easy-removal mechanisms that specifically distributed solutes and bubbles after icing impact downwards significantly to accelerate the recovery of the Cassie–Baxter state during melting.A series of environmental-related durability experiments including continuous icing&melting cycles,long-term salt spray,and high-pressure water jet impact further demonstrate the surfaces promising for real applications.

关键词： superomniphobic surfaces easy-removal environmental-related liquids icing melting