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Investigation of thermomechanical one-way and two-way shape memory behaviors of crosslinked poly (ethylene-co-vinyl acetate) / multi-walled carbon nanotube composites

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Smart materials and Structures 2025年第6期34卷 065022-065022页

作者： Jiawen Shi Naichang Chen Jie Tian Jianping Gu Huiyu Sun Hao Zeng School of Physical and Mathematical Sciences Nanjing Tech University Nanjing 211800 People’s Republic of China Wenzhou Yongliang Mechanical Technology Research Institute Wenzhou 325000 People’s Republic of China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and Engineering Nanjing Institute of Technology Nanjing 211167 People’s Republic of China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 People’s Republic of China West Taihu Industrial Research College of Nanjing Tech University Changzhou 213100 People’s Republic of China Jinggong Valve Group Co. LTD Wenzhou 325000 People’s Republic of China

This study systematically investigates the thermomechanical characterization of crosslinked poly(ethylene-co-vinyl acetate) (cEVA) nanocomposites reinforced with multi-walled carbon nanotubes (MWCNTs). Through melt-blending and thermo-curing, nanocomposites with 1–5 wt% MWCNTs were synthesized and rigorously evaluated via differential scanning calorimetry, dynamic mechanical analysis, and thermomechanical tests. The nanocomposites exhibit dual-responsive one-way (1 W-SME) and two-way (2 W-SME) shape memory effects under constant stress/strain conditions, driven by crystallization-induced elongation and melting-induced contraction mechanisms, with effective transition temperatures deviating from DSC-measured values due to mechanical loading. Large reversible strains in 2 W-SMEs and good shape fixity/recoverability in 1 W-SMEs were achieved. The study further elucidates the influence of MWCNT content, cooling/heating rates, and external loads on the thermomechanical responses, providing experimental and theoretical foundations for designing programmable actuators and adaptive structures. The integration of nanofiller-mediated crystallization control and thermomechanical coupling mechanisms highlights a novel pathway to tailor high-performance smart materials with predictable recovery and scalability.

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Overturned Loading of Inert CeO2to Active Co3O4for Unusually Improved Catalytic Activity in Fenton-Like Reactions

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Angewandte Chemie 2022年第16期134卷

作者： Chunli Song Qing Zhan Dr. Fei Liu Chuan Wang Dr. Hongchao Li Xuan Wang Prof. Xuefeng Guo Prof. Yingchun Cheng Wei Sun Prof. Li Wang Prof. Jieshu Qian Prof. Bingcai Pan Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology 200 Xiao Ling Wei Nanjing 210094 China Key Laboratory of Flexible Electronics & Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 China Key Lab of Mesoscopic Chemistry MOE School of Chemistry & Chemical Engineering Nanjing University Nanjing 210023 China Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education South-Central University for Nationalities Wuhan 430074 China Research Center for Environmental Nanotechnology (ReCENT) School of Environment State Key Laboratory of Environmental Pollution and Resources Reuse Nanjing University Nanjing 210023 China

In the past decades, numerous efforts have been devoted to improving the catalytic activity of nanocomposites by either exposing more active sites or regulating the interaction between the support and nanoparticles while keeping the structure of the active sites unchanged. Here, we report the fabrication of a Co 3 O 4 −CeO 2 nanocomposite via overturning the loading direction, i.e., loading an inert CeO 2 support onto active Co 3 O 4 nanoparticles. The resultant catalyst exhibits unexpectedly higher activity and stability in peroxymonosulfate-based Fenton-like reactions than its analog prepared by the traditional impregnation method. Abundant oxygen vacancies (O v with a Co⋅⋅⋅O v ⋅⋅⋅Ce structure instead of Co⋅⋅⋅O v ) are generated as new active sites to facilitate the cleavage of the peroxide bond to produce SO 4 .− and accelerate the rate-limiting step, i.e., the desorption of SO 4 .− , affording improved activity. This strategy is a new direction for boosting the catalytic activity of nanocomposite catalysts in various scenarios, including environmental remediation and energy applications.

关键词： CO Oxidation Fenton-Like Reaction Nanocomposite Catalyst Overturned Loading Oxygen Vacancy

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Preparation and characterization of cellulose/attapulgite composite aerogels with high strength and hydrophobicity

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Journal of Non-Crystalline Solids 2021年 569卷

作者： Sisi Shang Xin Ye Xing Jiang Qi You Ya Zhong Xiaodong Wu Sheng Cui State Key Laboratory of Materials-Oriented Chemical Engineering College of Materials Science and Engineering Nanjing Tech University Nanjing 210009 China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing 210009 PR China Suqian Advanced Materials Industry Technology Innovation Center of Nanjing Tech University China

The development of mechanical enhancement and sustainable absorbents for oil and chemical spills cleaning has attracted wide interest. In this work, novel and low-cost hydrophobic, cellulose/attapulgite (ATP) composite aerogels were prepared by freeze-drying and chemical vapor deposition. The composite aerogels were characterized by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray photoelectron (XPS), scanning electron microscopy (SEM), Brunaur-Emmett-Teller (BET), and mercury intrusion porosimetry. The formation of Si-O-Si and C-H bonds observed according to FTIR and XPS indicated that the methyl groups from methyltrimethoxysilane (MTMS) had been grafted on the composite aerogels. The as-prepared composite aerogels showed high hydrophobicity with water contact angle up to 161.1 °. Moreover, the composite aerogels had three-dimensional pore structures and good thermal stability. Compared to the pure microcrystalline cellulose (MCC) aerogel, the maximum compressive strength of composite aerogel with hydroxyethyl cellulose (HEC) and ATP build blocks was able to reach 1.43 MPa. Therefore, this work provided a low-cost method to prepare robust and sustainable MCC/HEC/ATP composite cellulose aerogels, which could be ideal absorbents for oil adsorption.

关键词： Aerogels Microcrystalline cellulose Hydroxyethyl cellulose Attapulgite Mechanical property

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The Physical Chemistry for the Self-assembly of Peptide Hydrogels

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Chinese Journal of Polymer Science 2018年第3期36卷 366-378页

作者： Ying Li Yi Cao Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and EngineeringJiangsu Engineering Technology Research Centre of Environmental Cleaning MaterialsJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlJiangsu Joint Laboratory of Atmaspheric Pollution ControlNanjing University of Information Science&TechnologyNanjing 210044China Collaborative Innovation Center of Advanced Microstrucures National Laboratony of Solid State MicrostrucureDepartment of PhysicsNanjing UniversityNanjing 210093China

Peptide hydrogels have been widely used for diverse biomedical applications. However, our current understanding of the physical principles underlying the self-assembly process is still limited. In this review, we summarize our current understanding on the physical chemistry principles from the basic interactions that drive the self-assembly process to the energy landscapes that dictate the thermodynamics and kinetics of the process. We discuss the effect of different factors that affect the kinetics of the self-assembly of peptide fibrils and how this is related to the macroscopic gelation process. We provide our understanding on the molecular origin of the complex and rugged energy landscape for the self-assembly of peptide hydrogels. The hierarchical self-assembled structures and the diverse self-assembling mechanism make it difficult and challenging to rationally design the physical and chemical properties of peptide hydrogels at the molecular revel. We also give our personal perspective to the potential future directions in this field.

关键词： Hydrogel Peptide Self-assembly Kinetics Thermodynamics

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Observation of nonreciprocal magneto-optical scattering in nonencapsulated few-layered CrI3

arXiv

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arXiv 2020年

作者： Guo, Kai Liu, Zhen Hu, Guangwei Shi, Zhongtai Li, Yue Zhang, Linbo Chen, Haiyan Zhang, Li Zhou, Peiheng Lu, Haipeng Lin, Miao-Ling Liu, Sizhao Cheng, Yingchun Liu, Xue Lu Xie, Jianliang Bi, Lei Tan, Ping-Heng Deng, Long jiang Qiu, Cheng-Wei Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore Key Laboratory of Flexible Electronics Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing211816 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences P. O. Box 912 Beijing100083 China

"Magneto-optical" effect refers to a rotation of polarization plane, which has been widely studied in traditional ferromagnetic metal and insulator films and scarcely in two-dimensional layered materials. Here we uncover a new nonreciprocal magneto-inelastic light scattering effect in ferromagnetic few-layer CrI3. We observed a rotation of the polarization plane of inelastic light scattering between -20o and +60o that are tunable by an out-of-plane magnetic field from -2.5 to 2.5 T. It is experimentally observed that the degree of polarization can be magnetically manipulated between -20% and 85%. This work raises a new magneto-optical phenomenon and could create opportunities of applying 2D ferromagnetic materials in Raman lasing, topological photonics, and magneto-optical modulator for information transport and storage. © 2020, CC BY-NC-SA.

关键词： Ferromagnetic materials

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Thermally Stable Polymer-Rich Solid Electrolyte Interphase for Safe Lithium Metal Pouch Cells

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Angewandte Chemie 2022年第51期134卷

作者： Shi-Jie Yang Nan Yao Feng-Ni Jiang Dr. Jin Xie Shu-Yu Sun Dr. Xiang Chen Prof. Dr. Hong Yuan Prof. Dr. Xin-Bing Cheng Prof. Dr. Jia-Qi Huang Prof. Dr. Qiang Zhang School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 China College of Chemical Engineering and Technology Taiyuan University of Technology Taiyuan 030024 Shanxi China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 211189 Jiangsu China

Serious safety risks caused by the high reactivity of lithium metal against electrolytes severely hamper the practicability of lithium metal batteries. By introducing unique polymerization site and more fluoride substitution, we built an in situ formed polymer-rich solid electrolyte interphase upon lithium anode to improve battery safety. The fluorine-rich and hydrogen-free polymer exhibits high thermal stability, which effectively reduces the continuous exothermic reaction between electrolyte and anode/cathode. As a result, the critical temperature for thermal safety of 1.0 Ah lithium-LiNi 0.5 Co 0.2 Mn 0.3 O 2 pouch cell can be increased from 143.2 °C to 174.2 °C. The more dangerous “ignition” point of lithium metal batteries, the starting temperature of battery thermal runaway, has been dramatically raised from 240.0 °C to 338.0 °C. This work affords novel strategies upon electrolyte design, aiming to pave the way for high-energy-density and thermally safe lithium metal batteries.

关键词： Electrolyte Lithium Metal Anode Pouch Cell Safety Thermal Runaway

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Carbon Oxyanion Self-Transformation on NiFe Oxalates Enables Long-Term Ampere-Level Current Density Seawater Oxidation

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Angewandte Chemie 2023年第1期136卷

作者： Zixiao Li Dr. Yongchao Yao Shengjun Sun Jie Liang Shaohuan Hong Hui Zhang Chaoxin Yang Xuefeng Zhang Zhengwei Cai Jun Li Yuchun Ren Yongsong Luo Dongdong Zheng Xun He Dr. Qian Liu Prof. Yan Wang Prof. Feng Gong Prof. Xuping Sun Prof. Bo Tang College of Chemistry Chemical Engineering and Materials Science Shandong Normal University Jinan 250014 Shandong China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 Sichuan China Department of Laboratory Medicine Precision Medicine Center West China Hospital Sichuan University Chengdu 610041 Sichuan China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 211189 Jiangsu China Institute for Advanced Study Chengdu University Chengdu 610106 Sichuan China School of Materials and Energy University of Electronic Science and Technology of China Chengdu 610054 Sichuan China Laoshan Laboratory Qingdao 266237 Shandong China

Seawater electrolysis is an attractive way of making H 2 in coastal areas, and NiFe-based materials are among the top options for alkaline seawater oxidation (ASO). However, ample Cl − in seawater can severely corrode catalytic sites and lead to limited lifespans. Herein, we report that in situ carbon oxyanion self-transformation (COST) from oxalate to carbonate on a monolithic NiFe oxalate micropillar electrode allows safeguard of high-valence metal reaction sites in ASO. In situ/ex situ studies show that spontaneous, timely, and appropriate COST safeguards active sites against Cl − attack during ASO even at an ampere-level current density ( j ). Our NiFe catalyst shows efficient and stable ASO performance, which requires an overpotential as low as 349 mV to attain a j of 1 A cm −2 . Moreover, the NiFe catalyst with protective surface CO 3 2− exhibits a slight activity degradation after 600 h of electrolysis under 1 A cm −2 in alkaline seawater. This work reports effective catalyst surface design concepts at the level of oxyanion self-transformation, acting as a momentous step toward defending active sites in seawater-to-H 2 conversion systems.

关键词： Carbonate Chlorine Chemistry Electrolysis Electrostatic Repulsion Seawater Oxidation

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Entanglement and correlations in a one-dimensional quantum spin-12 chain with anisotropic power-law long-range interactions

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Physical Review B 2020年第9期101卷 094410-094410页

作者： Jie Ren Wen-Long You Xiaoqun Wang Department of Physics Changshu Institute of Technology Changshu 215500 China College of Science Nanjing University of Aeronautics and Astronautics Nanjing 211106 China School of Physical Science and Technology Soochow University Suzhou Jiangsu 215006 China Key Laboratory of Artificial Structures and Quantum Control of MOE Shenyang National Laboratory for Materials Science School of Physics and Astronomy Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center for Advanced Microstructures Nanjing University Nanjing 210093 China Beijing Computational Science Research Center Beijing 100084 China

The correlations, entanglement entropy, and fidelity susceptibility are calculated for a one-dimensional spin-1/2 XXZ chain with anisotropic power-law long-range interactions by employing the density matrix renormalization group method. In particular, this long-range interaction is assigned to ferromagnetic for transversal components, while it can be either ferro- or antiferromagnetic for the longitudinal spin component. Two ground-state phase diagrams are established versus the anisotropy of the interactions, which not only changes the phase boundaries of the counterparts with short-range interactions, but also leads to the emergence of exotic phases. We found that the long-range interactions of the z component results in a Wigner crystal phase, whereas the transversal one may break a continuous symmetry, resulting in a continuous symmetry-breaking phase.

关键词： Entanglement entropy Long-range interactions Phase transitions Quantum phase transitions Density matrix renormalization group Spin chains XYZ model

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Noise-Driven Universal Dynamics towards an Infinite Temperature State

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Physical Review Letters 2020年第13期124卷 130602-130602页

作者： Jie Ren Qiaoyi Li Wei Li Zi Cai Xiaoqun Wang Department of Physics and Jiangsu Laboratory of Advanced Functional Material Changshu Institute of Technology Changshu 215500 China Key Laboratory of Artificial Structures and Quantum Control Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China School of Physics Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University Beijing 100191 China Wilczek Quantum Center School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Beijing Computational Science Research Center Beijing 100193 China Shenyang National Laboratory for Materials Science and T. D. Lee Institute Shanghai Jiao Tong University Shanghai 200240 China

Dynamical universality is the observation that the dynamical properties of different systems might exhibit universal behavior that are independent of the system details. In this Letter, we study the longtime dynamics of a one-dimensional noisy quantum magnetic model, and find that even though the system is inevitably driven to an infinite temperature state, the relaxation dynamics towards such a featureless state can be highly nontrivial and universal. The effect of various mode-coupling mechanisms (external potential, disorder, interaction, and the interplay between them) as well as the conservation law on the longtime dynamics of the systems have been studied, and their relevance with current ultracold atomic experiments has been discussed.

关键词： Dissipative dynamics Dynamical phase transitions Localization

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SERS molecular-ruler based DNA aptamer single-molecule and its application to multi-level optical storage

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Chemical Engineering Journal 2022年 433卷

作者： Ning Feng Lei Zhang Jingjing Shen Yanling Hu Weibing Wu Essy Kouadio Fodjo Shufen Chen Wei Huang Lianhui Wang Key Laboratory for Organic Electronics and Information Displays (KLOEID) & Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing 210023 China School of Electrical and Control Nanjing Polytechnic Institute 188 Xinle Road Nanjing 211500 China Jiangsu Provincial Key Lab of Pulp & Paper Science & Technology Nanjing Forestry University159 Longpan Road Nanjing 210037 China Laboratory of Constitution and Reaction of Matter University of Felix Houphouet-Boigny 22 BP 582 Abidjan 22 Cote d’Ivoire Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 China

Real-time analysis of DNA aptamer conformational changes is essential to understanding the function of DNA aptamers at the single-molecular level. Herein, we design core-satellite nanostructures as surface-enhanced Raman scattering (SERS) molecular-rulers to monitor the change process of single Hg 2+ aptamer under dark-field microscopy (DFM-) correlated Raman spectroscopy. Applying the SERS molecular-ruler, the individual Hg 2+ aptamer conformational change events triggered by Hg 2+ that leads to the stepwise closing of the satellite to the core is continuously monitored by changes in SERS intensity. Moreover, individual Hg 2+ aptamer conformational change events are confirmed by in-situ scanning electron microscopy (SEM) and finite difference time-domain (FDTD) calculation. Furthermore, the SERS molecular-ruler is a valid method for studying aptamer intermediate states, the binding sites in aptamer and the kinetics of Hg 2+ aptamer configuration change at the single-molecule level. Such findings are promising for exploring the mechanism of DNA aptamer configuration change and providing the fundamental understanding for designing various DNA aptamer based biological applications. For future applications, SERS molecular-ruler has the potential to realize multi-level optical storage and presents a new practical and effective method for designing multi-level storage system.

关键词： SERS Surface-enhanced Raman scattering DFM Dark-field microscopy SEM Scanning electron microscopy FDTD Finite difference time-domain TERS Tip-enhanced Raman spectroscopy AuNP Gold nanoparticle R Relaxed T Taut PAGE Polyacrylamide gel electrophoresis LSPR Localized surface plasmon resonance ITO Indium tin oxide TEM Transmission electron microscopy 4-MBA 4-mercaptobenzoic acid EF Enhancement factor MPTES 3-mercaptopropyltriethoxysilane Tetrahedral DNA structure SERS molecular-ruler Hg 2+ aptamer conformational change Stepwise rises of Raman intensity Multi-level optical storage

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