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A hygro-thermo-mechanical constitutive model for shape memory polymers filled with nano-carbon powder

International Journal of Smart and Nano materials 2021年第3期12卷 286-306页

作者： Jianping Gu Xiaopeng Zhang Hao Duan Mengqi Wan Huiyu Sun Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of TechnologyNanjingChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjingChina

The nano-carbon powders are often used as fillers to endow the shape memory polymers(SMPs)with *** has been found that the shape memory effects(SMEs)of SMPs filled with nano-carbon powder can be triggered both by temperature and by *** reveal the driving mechanism of SMEs,a constitutive model for describing the thermally activated and moisture activated SMEs of these shape memory polymer composite(SMPCs)is developed *** both of the SMEs share the same driving mechanism,the variable moisture is incorporated into the framework of a thermo-mechanical modeling approach to disclose the effect of moisture on the thermoviscoelastic *** SMPCs are regarded as isotropic materials and the effect of carbon powder on the mechanical properties of the matrix is also considered in the *** the complete recovery may not be reached even they are exposed to the stimulus environment long enough,the blocking mechanism is also considered *** is the mainly new contribution compared to the early *** the method of parameter determination presented here,the effectiveness of the proposed hygro-thermo-mechanical constitutive model is confirmed by comparing the model results with the test data of uniaxial deformation from the literature.

关键词： Shape memory polymer composites nano-carbon powder hygro-thermomechanical constitutive model thermodynamics internal state variables

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Diselenide as a Dual Functional Mechanophore Capable of Stress Self-Reporting and Self-Strengthening in Polyurethane Elastomers

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CCS Chemistry 2023年第4期5卷 925-933页

作者： Xiaopei Li Fan Yang Yiran Li Cheng Liu Peng Zhao Yi Cao Huaping Xu Yulan Chen Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072 Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructureNanjing UniversityNanjingJiangsu 210093 Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular EngineeringTsinghua UniversityBeijing 100084 College of Chemistry State Key Laboratory of Supramolecular Structure and MaterialsJilin UniversityChangchunJilin 130012

Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under ***-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic *** overcome this challenge,chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials ***,we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide(Se–Se)as a *** has been functionalized with labile Se–Se bonds,whosemechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in *** reactions are activated efficiently in a mechanical way by compression in bulk *** resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed *** study not only illuminates themechano-responsive nature of Se–Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.

关键词： diselenide mechano-responsive polymers self-strengthening polymermechanochemistry stress sensing

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Construction of Asymmetric Anion Layer to Accelerate Carrier Reaction Kinetics and Thermodynamically Promote Photocatalytic CO2 Reduction

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advanced Functional materials 2025年

作者： Gui, Wenke Jiang, Shan Wang, Luyuan Liu, Chuangwei Huang, Zichao Wang, Li Yang, Jianping State Key Laboratory of Advanced Fiber Materials College of Materials Science and Engineering Donghua University Shanghai201620 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China

The efficient photocatalytic reduction of CO2 into value-added chemicals is significantly challenged by the charge carrier separation and transfer kinetics of photocatalysts as well as the thermodynamics of the CO2 reduction process. Herein, it proposes a heterojunction with asymmetric W-Cl anion layer in Bi2WO6 (abbreviated as BWOC). The asymmetric W-Cl anion layer results in unbalanced electron density distribution and thus enables to establish atomic-level donor–acceptor structure as well as larger electrostatic potential in the heterojunction, which facilitate the charge carrier separation and transfer kinetics. Simulation on the intermediates of the CO2 photoreduction process demonstrates that Bi2WO6 with asymmetric W-Cl anion layer possesses smaller energy barrier for the rate-determining step of *COOH endothermic formation, and it is thermodynamically more favorable to generate CO as further confirmed by the detection of intermediates over in situ Fourier transform infrared spectroscopy. As a result, BWOC achieved rather high CO yield with the value of 32.11 µmol g−¹ h−¹ which is nearly four times higher than that of pure Bi2WO6. The construction of asymmetric anion layer in this work provides new insights for the design of efficient photocatalytic systems toward CO2 reduction. © 2025 Wiley-VCH GmbH.

关键词： Fourier transform infrared spectroscopy

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Electric field manipulation of magnetic skyrmions

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Rare Metals 2022年第12期41卷 4000-4014页

作者： Ya-Dong Wang Zhi-Jian Wei Hao-Ran Tu Chen-Hui Zhang Zhi-Peng Hou Guangdong Provincial Key Laboratory of Optical Information Material and Technology&Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Dongguan University of Technology Dongguan 523808China Physical Science and Engineering Division(PSE) King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Magnetic skyrmions are vortex-like swirling spin textures that are promising candidates for carrying information bits in future magnetic memories or logic *** build skyrmionic devices,researchers must electrically manipulate magnetic skyrmions to enable easy integration into modern semiconductor *** operation generally uses a spin-polarized current,which unavoidably causes high energy dissipation and Joule ***,the electric-field strategy is a hopeful alternative for electrically manipulating the skyrmions due to the strategy’s negligible Joule heating and low energy *** this review,we systematically summarize the theoretical and experimental development of the electricalfield manipulation of magnetic skyrmions over the past *** review the following magnetic systems and physical mechanisms:(ⅰ)ultra-thin multilayer films with accumulation and release of interfacial charge,(ⅱ)singlephase multiferroic material with magneto-electric coupling,(ⅲ)ferromagnetic/ferroelectric(FM/FE)multiferroic heterostructure with magneto-elastic ***,we consider future developmental trends in the electric-field manipulation of magnetic skyrmions and other topological magnetic domain structures.

关键词： Magnetic skyrmion Electric field Low energy cost Dzyaloshinskii-Moriya interaction(DMI)

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Self-assembled CoOOH on TiO_(2) for enhanced photoelectrochemical water oxidation

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Journal of Energy Chemistry 2021年第9期30卷 512-521页

作者： Xiangrong Ren Yujin Ji Yiyue Zhai Ningyi Yuan Jianning Ding Youyong Li Junqing Yan Shengzhong Frank Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123JiangsuChina iChEM Dalian Institute of Chemical PhysicsUniversity of Chinese Academy of SciencesChinese Academy of SciencesDalian 116023LiaoningChina School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Cultivation Base for State Key Laboratory of Photovoltaic Science and TechnologyChangzhou UniversityChangzhou 213164JiangsuChina

Providing efficient charge transfer through the interface between the semiconductor and co-catalyst is greatly desired in photoelectrocatalytic (PEC) energy ***,we excogitate a novel and facile means,via electrochemical activation,to successfully load the amorphous CoOOH layer architecture onto the surface of TiO_(2).Intriguingly,the as-obtained 6%CoOOH-TiO_(2)photoelectrode manifests optimal PEC performance with a high photocurrent density of 1.3 mA/cm~2,3.5 times higher than that of pristine TiO_(2).Electrochemical impedance spectroscopy (EIS),Tafel analysis and cyclic voltammetry (CV) methods show that the carrier transfer barrier within the electrode and the transition of Co^(3+)OOH to Co^(4+)OOH have the dominating effects on the PEC *** calculation reveals that the interface between the CoOOH and TiO_(2)improves the homogeneity of effective d-orbital electronic-transfer ability among Co *** research sheds light on the water oxidation reaction and the design of more favorable PEC cocatalysts.

关键词： Amorphous Co-catalyst Water oxidation Mechanism TiO_(2)

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Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

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Journal of Magnesium and Alloys 2024年第4期12卷 1367-1385页

作者： Bangzhao Yin Jinge Liu Bo Peng Mengran Zhou Bingchuan Liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian Yufeng Zheng State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China

Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical *** thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg *** this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were *** required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous *** tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy *** thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the *** the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy *** increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain *** the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural *** effect of layer thickness on the compressive properties of porous scaffolds was ***,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.

关键词： Magnesium alloy WE43 Laser powder bed fusion Layer thickness Process optimization

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Dynamic Oxime-Urethane Bonds, a Versatile Unit of High Performance Self-healing Polymers for Diverse Applications

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Chinese Journal of Polymer science 2021年第10期39卷 1281-1291,I0006页

作者： Luzhi Zhang Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringShanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineDonghua UniversityShanghai 201620China

Oxime-urethane bond featuring with high reversibility even at room temperature and multiple reactivity is an emerging dynamic covalent bond,and has shown great potential for self-healing polymers,which are one of the most attractive development directions for next generation of polymeric *** this review,recent progresses on the oxime-urethane-based self-healing polymers,including their designs and applications in diverse fields such as biomedicine,flexible electronics,soft robots,3D printing,protective materials,and adhesives,are summarized,and outlooks on the future development of this field are discussed.

关键词： Self-healing Dynamic covalent bonds Polyurethane Covalent adaptable networks Metal coordination

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Erratum to:Efficient and stable perovskite solar cells by build-inπ-columns and ionic interfaces in covalent organic frameworks

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Nano Research 2024年第5期17卷 4639-4640页

作者： Riming Nie Xiaokai Chen Zhongping Li Weicun Chu Si Ma Changqing Li Xiaoming Liu Yonghua Chen Zhuhua Zhang Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratoryfor Itligent Nano Materials and Devices of the Ministry of EducationInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNarnjing 210016China Department of Chemical and Biomolecular Engineering Yonsei Universit50 Yonsei roSeodaemun-guSeoul 120749Republic of Korea College of Chemistry jilin UniversityChangchun 130012China Department of Energy and Chemical Engineering Ulsan National Instute of Science and Technology(UNIST)50 UNIST-gilEonyang-eupUju-gunUlsan 44919Republic of Korea Key Laboratory of Flexible Electronics(KLoFE) School of Flexible Electronics(Future Technologies)&Institute of Advanced Materials(IAM)Nanjing Tech University(Nanjing Tech)Nanjing 211816China

Erratum to Nano Research,2023,16(7):9387-9397 htps:/***/0.100/1274-023-5603-040(1)One sentence in the article was unfortunately mispresented on page *** of As shown in Fig.S19 in the ESM,the A2/A2 values of the refere... 详细信息

关键词： COF columns perovskite

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interface properties of AuAg/Al interface with different doping elements by first principles calculations

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materials Today Communications 2025年 47卷

作者： Xiong, Hui Han, Xujin Zhang, Zhengyun Liu, Manmen Zhang, Kunhua Zhou, Xiaolong Faculty of Materials Science and Engineering/Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Yunnan Kunming650093 China Kunming Institute of Precious Metals Kunming650106 China

In this paper, the effect of doping elements (X = Al, Ca, Ga, In, Ni, Pt, Sc, V) on the properties of the AuAg/Al interface is investigated by using first principles calculations based on density functional theory. By co1nstructing a stable interface model, it is found that Al, Ni, Pt, and V doping reduces the volume of the interfacial system, while Ca, Ga, In, and Sc increase the volume. The interfacial energy analysis shows that all doped systems exhibit positive interfacial energies and are lower than those of the undoped systems, proving that doping can improve interfacial stability. Adhesion work calculation shows that Al, Ni, Pt, Sc, V doping AuAg/Al interface adhesion work increases, can significantly enhance the interfacial bonding strength, of which Pt's enhancement is the largest, the adhesion work is 2.41 J/m2, interfacial energy of 1.20 J/m2;while Ca, In doping the AuAg/Al interfacial adhesion work decreases this rather weakens the interfacial bonding strength. The analysis of the density of states at the AuAg-X/Al interface shows that after doping Ni, Pt, Sc, and V, their d orbitals and Al-p orbitals exhibit overlapping peaks near the Fermi level, showing the hybridization characteristics of d-p orbitals. This may indicate the formation of new chemical bonds. After doping Ca, Ga, and In, they have almost no overlapping peaks with the electron orbitals of Al. Whether doped or not, the Au-d orbitals exhibit orbital hybridization characteristics with the Al-p orbitals, forming Au-Al covalent bonds. Through the differential charge density at the AuAg-X/Al interface, it was found that the interface charge distribution after doping Al, Ga, and Sc was not much different from that without doping. There was an overlap of electron clouds between Au and Al atoms, and there were relatively tight Au-Al covalent bonds. The doping of Ni, Pt, and V promoted the accumulation and increase of interface charges, which might have formed strong chemical bonds. The interfacia

关键词： Covalent bonds

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Trinuclear Dy(III)Single-Molecule Magnets with Two-Step Relaxation

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Chinese Journal of Chemistry 2023年第20期41卷 2641-2647页

作者： Yi-Shu Jin Cai-Ming Liu Yi-Quan Zhang Hui-Zhong Kou Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084 China Beijing National Laboratory for Molecular Sciences Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing100190 China Jiangsu Key Lab for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210023 China

The reaction of DyCl_(3)·6H_(2)O with a rigid diacylhydrazone ligand(H_(2)L)afforded a trinuclear precursor[Dy_(3)L_(2)Cl_(3)(H_(2)O)_(2)(CH_(3)OH)]Cl_(2)·3CH_(3)OH(1).The replacement of the Cl-ions and the coordinating solvents by the aryloxides ligands(Lx)-yields three trinuclear complexes[Dy_(3)L_(2)(Lx)_(5)]·nsol(x=1,2-naphthol(2);x=2,7-hydroxycoumarin(3);and x=3,phenol(4)).In complexes 2-4,two end Dy^(3+)centers adopt almost identical N_(4)O_(4) coordination sphere of D6h geometry while the central one adopts N_(4)O_(5) coordination sphere in Cs *** measurements reveal weak antiferromagnetic interactions in the hydrated samples 2e-4e and two-step slow relaxation process under zero dc field with effective energy barriers Ueff of 439 and 91 K,353 and 40 K,466 and 89 K for SR and FR in 2e-4e,*** dynamic magnetic behaviour for 4 persists in the magnetically diluted sample of 4@*** 4 possesses the short Dy-O_(aryloxide) bond distance of 2.055(18)Å,and the largest Ueff among the reported linear trinuclear dysprosium ***,the functionalized aryloxides ligands(Lx)-show photoluminescence via intramolecular energy transfer,making 2e-4e luminescent Dy^(3+)SMMs with high energy barriers.

关键词： Coordination modes Lanthanides Crystal structure Ab initio calculations Magnetic properties Luminescence

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