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Solvent-induced reversible transformation between monomer-Ag_(32) and dimer-(Ag_(32))_(2) nanoclusters

Chinese Journal of Structural Chemistry 2023年第7期42卷 28-33页

作者： Ying Xu Hao Li Jiaojiao Han Xuejuan Zou Xi Kang Manzhou Zhu Department of Chemistry and Centre for Atomic Engineering of Advanced Materials Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information Technology and Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsAnhui UniversityHefei230601China

The controllable transformation of metal nanoclusters remains highly desirable for the preparation of new clusters with novel structures and the elucidation of cluster conversion ***,we present the reversible transformation between two high-nuclearity silver cluster homologs,Ag_(32)S_(3)(S^(t)Bu)_(16)(CF_(3)COO)_(9)(CH_(3)CN)_(4)(NO_(3))(abbreviated as monomer-Ag_(32))and[Ag_(32)S_(3)(S^(t)Bu)_(16)(CF_(3)COO)_(9)(CH_(3)CN)(NO_(3))]_(2)(abbreviated as dimer-(Ag_(32))_(2)).Triggered by the solvent effect,the reversible conversion between monomer-Ag_(32) and dimer-(Ag_(32))_(2) nanoclusters has been *** dimer-(Ag_(32))_(2),two CF_(3)COO-linkers were bound onto the symmetrical edges of adjacent Ag_(32) subunits,giving rise to the dimeric existence form of the final *** optical properties,including optical absorptions and emissions,of the cluster monomer and dimer were then *** work offered an interesting case for constructing self-assembled cluster structures with the assistance of certain solvents and multidentate ligands.

关键词： Nanoclusters Structure determination Reversible transformation Self-assembly Structure-property correlations

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Super-Tough and Environmentally Stable Aramid Nanofiber@MXene Coaxial Fibers with Outstanding Electromagnetic Interference Shielding Efficiency

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Nano-Micro Letters 2022年第7期14卷 72-85页

作者： Liu-Xin Liu Wei Chen Hao-Bin Zhang Lvxuan Ye Zhenguo Wang Yu Zhang Peng Min Zhong-Zhen Yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although electrically conductive and hydrophilic MXene sheets are promising for multifunctional fibers and electronic textiles,it is still a challenge to simultaneously enhance both conductivity and mechanical properties of MXene fibers because of the high rigidity of MXene sheets and insufficient inter-sheet ***,we demonstrate a core-shell wet-spinning methodology for fabricating highly conductive,super-tough,ultra-strong,and environmentally stable Ti_(3)C_(2)T_(x) MXene-based core-shell fibers with conductive MXene cores and tough aramid nanofiber(ANF)*** highly orientated and low-defect structure endows the ANF@MXene core-shell fiber with supertoughness of~48.1 MJ m^(-3),high strength of~502.9 MPa,and high conductivity of~3.0×10^(5)S m^(-1).The super-tough and conductive ANF@MXene fibers can be woven into textiles,exhibiting an excellent electromagnetic interference(EMI)shielding efficiency of 83.4 dB at a small thickness of 213μ***,the protection of the ANF shells provides the fibers with satisfactory cyclic stability under dynamic stretching and bending,and excellent resistance to acid,alkali,seawater,cryogenic and high temperatures,and *** oxidation resistance of the fibers is demonstrated by their wellmaintained EMI shielding *** multifunctional core-shell fibers would be highly promising in the fields of EMI shielding textiles,wearable electronics and aerospace.

关键词： Core-shell fibers MXene sheets Electromagnetic interference shielding Aramid nanofibers Super-toughness

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Effect of Hydrostatic Pressure on the Anodic Dissolution Process of X80 Steel

SSRN

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SSRN 2024年

作者： Wu, Shixiong Gao, Zhiming Jia, Hang Liu, Jialiang Hu, Wenbin School of Material Science and Technology Tianjin University Tianjin30072 China Tianjin Key Laboratory of Composite and Functional Materials Tianjin300350 China Key Laboratory of Advanced Ceramics and Machining Technology China

Based on the fact that hydrostatic pressure affects chemical potentials of reaction species and the structure evolution of electric double layer (EDL), the authors propose a generalized-BV equation to analyze the anodic dissolution process of X80 steel in deep-sea environment. Combined with the results of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests, the following conclusions can be drawn: hydrostatic pressure can compress the electric double layer non-uniformly. The (capacitance of diffused layer;: capacitance of compact layer) value increases first and then decreases with increasing hydrostatic pressure and reaches its maximum at 15 MPa, which is sure to influence the difference in electrical potential that drives chemical reaction at interface. Ultimately, the anodic dissolution current increases and then decreases with rising hydrostatic pressure at the same anodic polarized potential. Besides, low hydrostatic pressure may contribute to forming a dense corrosion product film and inducing a good inhibiting effect on further dissolution of X80 steel;However, when the hydrostatic pressure exceeds the critical value of 20Mpa, too high anodic dissolution rate along with promoted Cl- adsorption will deteriorate the protection performance of corrosion product film, and exacerbate local corrosion process. © 2024, The Authors. All rights reserved.

关键词： Hydrostatic pressure

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Hybrid anionic block copolymerization:From organocatalysis-streamlined crossover to internally microphase-separated aggregates

Aggregate

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Aggregate 2024年第4期5卷 226-235页

作者： Lijun Liu Heng Li Pengfei Zhang Yubo Zhou Junpeng Zhao Guangzhao Zhang Faculty of Materials Science and Engineering South China University of TechnologyGuangzhouPeople’s Republic of China College of Chemistry and Key Laboratory of Advanced Organic Functional Materials of Colleges and Universities of Hunan Province Xiangtan UniversityXiangtanPeople’s Republic of China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhouPeople’s Republic of China

Polyolefin-b-poly(ethylene oxide)(PEO)represents the most widely investigated amphiphilic block *** far,one-pot continuous synthesis of such hybrid block copolymers has only been fulfilled by anionic polymerization through sequen-tial addition of vinyl monomers and ethylene oxide(EO).It still remains challenging to achieve altogether high block efficiency,high polymerization efficiency,and high molar mass for ***,we report a one-pot hybrid block copolymerization approach to polyisoprene/polystyrene(PI/PS)-b-PEO,in which PI/PS are formed by sBuLi-initiated anionic vinyl-addition polymerization,then in situ employed as macroinitiators for the anionic ring-opening polymerization(ROP)of EO aided by an organic Lewis *** cooperative(dual-ion-complexing)catalytic effect of organobase and triethylborane is proven,for thefirst time,effective for lithium alkoxide initiator system,allowing to achieve at room temperature high ROP activity(complete EO conversion and PEO of 3–64 kg/mol reached in 1–6 h),narrow molar mass distribution,controlled block lengths and *** functional the-ory calculation shows that phosphazene bases are particularly effective,compared with N-heterocyclic bases,for complexing with Li+and enhancing the nucleophilicity of *** rate of ROP is also affected by Li^(+)-induced aggregation of the chain-end ion pairs,which though can be offset by adequate catalyst *** versatility of this approach is further demonstrated in the one-pot synthesis of tri-/tetrablock ter-/quaterpolymers constituted by PI,PS,PEO,and poly(propylene oxide).Of great interest,PS-b-PI-b-PEO triblock terpolymer with a specific com-position is found to form internally microphase-separated micellar aggregates when dispersed in water.

关键词： aggregation anionic polymerization block copolymer organocatalysis ring-opening polymerization

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BaMgSiO4-based composites with photochromic and persistent luminescent behaviors for advanced anti-counterfeiting applications

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Ceramics International 2025年第16期51卷 21735-21741页

作者： Liu, Meng Shao, Jie Li, Xiyang Guo, Yu Lu, Chunxiao Ke, Shanjun Sun, Haiqin Zhang, Qiwei University Engineering Research Center of Advanced Functional Materials and Intelligent Sensing Guangxi Guilin541004 China College of Physics and Technology Guangxi Normal University Guilin541004 China High-Tech Co. Ltd. Baotou014010 China Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices School of Materials Science and Engineering Inner Mongolia University of Science and Technology Baotou014010 China Guangxi Oceano Ceramics Co. Ltd. Wuzhou543300 China

Photochromic (PC) materials with persistent luminescent (PersL) behaviors show potential applications in advanced anti-counterfeiting and optical storage fields. However, it is difficult to simultaneously achieve PC and PersL properties in a single host, due to their different positions of defect energy levels between conduction band and valence band. In this work, a new strategy is proposed to obtain two features by constructing two-phase composites of photochromic BaMgSiO4:Eu2+ and long afterglow Sr2MgSi2O7:Eu2+/Dy3+ materials. The optimized composite sample not only exhibited the reversible white-purple color change by alternating 365 nm and 520 nm light irradiation, but also showed the blue afterglow luminescence for more than 20 min. The designed anti-counterfeiting component based on the composite sample provides a higher-level security anti-counterfeiting than conventional PC materials. These results may facilitate more innovative designs for future dynamic anti-counterfeiting and optical storage applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Photochromism

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Recent advances in the synthesis and applications of furocoumarin derivatives

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Chinese Chemical Letters 2023年第9期34卷 119-133页

作者： Chaoyue Chen Zheng-Bin Tang Zhichang Liu School of Chemistry and Chemical Engineering Jiangsu University of TechnologyChangzhou 213001China Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of ChemistrySchool of Science and Research Center for Industries of the FutureWestlake Universityand Westlake Institute for Advanced StudyHangzhou 310030China

Furocoumarins are an important class of heterocyclic compounds with a fused tricyclic structure of coumarin and furan *** are commonly found in bioactive natural products and have a diverse range of biological and pharmaceutical properties,including cytotoxicity,photosensitivity,insecticidal,antibacterial,and antifungal activity,among *** elegant linear/angular tricyclic skeleton and superior pharmacological properties,make them ideal for building and developing advanced biological scaffolds for biomedical *** a result,the family of furocoumarins has been the focus of intensive research,and lots of encouraging progress have been achieved in recent *** review summarizes the most recent methods reported for the synthesis of the furocoumarin derivative family,along with their applications in medicinal chemistry covering from 2018 to 2022.

关键词： Furocoumarin Coumarin Furan Synthesis Pharmaceutical activity Applications

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Modulating surface oxygen species via facet engineering for efficient conversion of nitrate to ammonia

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Journal of Energy Chemistry 2023年第3期78卷 211-221,I0007页

作者： Wenye Zhong Zhiheng Gong Zuyun He Nian Zhang Xiongwu Kang Xianwen Mao Yan Chen School of Environment and Energy State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510006GuangdongChina State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Department of Materials Science and Engineering National University of SingaporeSingapore 119077Singapore Institute of Functional Intelligent Materials National University of SingaporeSingapore 119077Singapore Centre for Advanced 2D Materials National University of SingaporeSingapore 119077Singapore

Electrochemical reduction of nitrate,a common pollutant in aquatic environment,to valuable ammonia(NO3-RR) using renewably-sourced electricity has attracted widespread interests,with past efforts mainly focused on designing electrocatalysts with high activity and *** detailed correlation between catalyst properties and NO3-RR kinetics,nevertheless,is still not fully *** this work,we modulate the surface oxygen species of Cu_(2)O via facet engineering,and systematically study the impact of these oxygen species on the NO_(3)^(-)RR *** advanced spectroscopic techniques,densi ty fu n ctional theory calculations and molecular dynamics simulations,we find that while oxygen vacancies on Cu_(2)O(111) surface promote the adsorption of reactants and reaction intermediates,hydroxyl groups effectively inhibit the side reaction of hydrogen evolution and facilitate the hydrogenation process of *** two effects work in concert to render Cu_(2)O(111) facet the highest NO3-RR activity relative to those from other *** study provides critical insights into the synergistic effect of exposed facets and surface oxygen species on heterogeneous catalysis,and offers a generalizable,facet engineeringbased strategy for improving the performance of a variety of electrocatalysts important for renewable energy conversion.

关键词： Facet engineering Oxygen vacancy Hydroxyl group Electrochemical nitrate reduction Ammonia

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Light-Emitting Diodes Based on Two-Dimensional Nanoplatelets

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Energy Material Advances 2022年第1期2022卷 320-343页

作者： Yating Guo Feng Gao Pan Huang Rong Wu Wanying Gu Jing Wei Fangze Liu Hongbo Li Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyBeijing 100081China

Colloidal semiconductor nanocrystals(NCs)attract significant interest in recent years due to their narrow and tunable emission wavelength in the visible range,as well as high photoluminescence quantum yield(PLQY),which are highly desired in display *** high-quality NCs have been recognized as vital luminescent materials in realizing next-generation display *** further development,NCs with near-unity PLQY have been successfully synthesized through engineering of the core/shell ***,as the external quantum efficiency(EQE)of the nanocrystal light-emitting diodes(LEDs)approaches the theoretical limit of about 20%,the low out-coupling factor proposes a challenge of enhancing the performance of a device when using the spherical ***,the anisotropic NCs like nanoplatelets(NPLs)are proposed as promising solutions to improve the performance of nanocrystal *** this review,we will summarize the synthetic strategies of twodimensional(2D)NPLs at ***,we will introduce fundamental concepts of LEDs,the main approaches to realize LEDs based on nanoplatelets,and the recent ***,the challenges and opportunities of LEDs based on anisotropic NCs are also presented.

关键词： tunable quantum anisotropic

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Enhancing crystal integrity and structural rigidity of CsPbBr_(3) nanoplatelets to achieve a narrow colorsaturated blue emission

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Light(science & Applications) 2024年第5期13卷 985-997页

作者： Qianqian Huang Wenxu Yin Bo Gao Qingsen Zeng Dong Yao Hao Zhang Yinghe Zhao Weijia Zheng Jiaqi Zhang Xuyong Yang Xiaoyu Zhang Andrey L.Rogach Key Laboratory of Automobile Materials MOE School of Materials Science&Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchunChina. State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina. State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina. Department of Chemistry University of VictoriaVictoriaBCCanada. Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghaiChina. Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.RChina

Quantum-confined CsPbBr_(3) perovskites are promising blue emitters for ultra-high-definition displays,but their soft lattice caused by highly ionic nature has a limited ***,we endow CsPbBr_(3) nanoplatelets(NPLs)with atomic crystal-like structural rigidity through proper surface engineering,by using strongly bound N-dodecylbenzene sulfonic acid(DBSA).A stable,rigid crystal structure,as well as uniform,orderly-arranged surface of these NPLs is achieved by optimizing intermediate reaction stage,by switching from molecular clusters to mono-octahedra,while interaction with DBSA resulted in formation of a Cs_(x)O monolayer shell capping the NPL *** a result,both structural and optical stability of the CsPbBr3 NPLs is enhanced by strong covalent bonding of DBSA,which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand ***,rather small amount of DBSA ligands at the NPL surface results in a short inter-NPL spacing in their closely-packed films,which facilitates efficient charge injection and *** photoluminescence of the produced CsPbBr_(3) NPLs is bright(nearly unity emission quantum yield)and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K,while the bandwidth of the electroluminescence(peaked at 460 nm)also reaches a record-narrow value of 15 nm at room *** value corresponds to the CIE coordinates of(0.141,0.062),which meets Rec.2020 standards for ultra-high-definition displays.

关键词： temperature stability narrow

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A double-walled porous metal-perylenediimide framework for enhanced photocatalysis

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science China Chemistry 2025年

作者： Lili Ma Feinian Yang Longyi Ding Duojun Cao Yang Li Qingchun Xia Ying-Feng Han Guozan Yuan School of Chemistry and Chemical Engineering Anhui University of Technology Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials School of Chemistry and Chemical EngineeringHenan Normal University Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Xi'an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest University

Perylenediimide （PDI） materials have gained considerable interest as photocatalysts owing to their exceptional photophysical ***,the development of PDI-based photocatalysts remains constrained by several critical limitations,such as rapid charge recombination and aggregation-induced ***,we report the design and synthesis of a crystalline porous metal-perylenediimide framework （MPF） through the self-assmebly of PDI-based tetracarboxylate ligand （H4PDI） with Ce3+*** resulting Ce-PDI framework features a distinctive double-walled porous structure,stabilized by robustπ-πstacking interactions between PDI *** architecture offers abundant active sites and ample space for substrate-catalyst interactions,while mitigating aggregation-induced quenching of PDI units and facilitating efficient photogenerated charge *** to the hydrogen-bonded assembly H4PDI with its dense packing,our double-walled porous Ce-PDI framework demonstrated markedly improved photocatalytic activity and ***,Ce-PDI achieved catalytic yields of up to95%for the C-3 formylation of indoles and 97%for the condensation of o-phenylenediamine with aromatic aldehydes,significantly outperforming H4PDI,which only achieved yields of 16%–34%.This work provides a simple and effective approach to overcoming the inherent limitations of PDI-based photocatalysts,thereby advancing their catalytic performance.

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