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The effect of entanglement concentration on the melt memory of polyethylene random copolymer

Polymer 2025年 332卷

作者： Wang, Zefan Zeng, Jiale Liang, Yuling Zhang, Rongchun Zhu, Caizhen Xu, Jian Müller, Alejandro J. School of Chemistry and Environmental Engineering Shenzhen University No. 3688 Nanhai Avenue Nanshan District Shenzhen518060 China South China University of Technology Guangzhou510640 China Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials South China University of Technology Guangzhou510640 China Polymat and Department of Polymers and Advanced Materials: Physics Chemistry and Technology Faculty of Chemistry University of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 Donostia-San Sebastián20018 Spain IKERBASQUE Basque Foundation for Science Plaza Euskadi 5 Bilbao48009 Spain

Upon heating a semi-crystalline polymer above its melting temperature, some ordered chain cluster structures inherited from previous crystallization processes can sometimes be preserved depending on the temperature. These structures can act as self-nuclei that enhance polymer nucleation during subsequent cooling. This phenomenon has been termed "melt memory", and its nature has attracted much scientific discussion. Recent studies on poly(Ε-caprolactone) and poly(ethylene oxide) in an extensive molecular weight range have demonstrated that increased entanglement density can strongly enhance the strength of melt memory. However, evidence for a quantitative relationship between entanglement concentration and melt memory temperature window is still scarce. In this work, we selected a narrowly distributed branched ethylene/butene-1 copolymer (i.e., hydrogenated polybutadiene) as a model material due to its wide melt memory temperature range caused by the segregation of crystallizable and non-crystallizable sequences. A series of PE blends with variable entanglement concentrations were prepared by mixing the ethylene/butene-1 copolymer with an unentangled low molecular weight linear polyethylene (PE). Differential scanning calorimetry (DSC) and small angle X-ray scattering (SAXS) results showed that lower entanglement concentration leads to thinner amorphous layers and, therefore, higher crystallinity. A quantitative relationship between entanglement concentration and melt memory effect has been established based on DSC self-nucleation experiments. Our results demonstrate that the dilution of entanglements and overall comonomer fractions reduces the complexity of the amorphous phase. As a result, nano-sized separated structures could be homogenized at lower temperatures, resulting in lower thermal stability of self-nuclei and, thus, weaker melt memory. © 2025 Elsevier Ltd

关键词： Differential scanning calorimetry

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Bioplastic reinforced with parthenocarpic date palm fibers:Characterization and microorganisms involved in degradation

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Food Bioscience 2023年第1期51卷 1202-1211页

作者： Hammadi Hamza Imen Bettaieb Ameni Benltoufa Achraf Ghorbal Hela Ben Ahmed Walid Elfalleh Arid and Oases Cropping Laboratory Arid Area InstituteMedenine4119Tunisia Energy WaterEnvironment and Process Laboratory(LR18ES35)National Engineering School of GabesUniversity of GabesGabes6072Tunisia Research Unit Advanced Materials Applied MechanicsInnovative Processes and EnvironmentUR22ES04Higher Institute of Applied Sciences and Technology of Gabes(ISSATG)University of GabesGabes6072Tunisia Laboratory of Plant Soil and Environment Interactions LR21ES01 Department of BiologyFaculty of Science of Tunis2092 TunisUniversity of Tunis EL ManarTunis1068Tunisia

The environment suffers more and more from the accumulation of plastics made by petrochemical rows,which are *** is why this study aims to develop bio-based films by incorporating fibers concentrate of parthenocarpic date(FCPD)as easily available *** FCPD based film showed enhanced thickness,water solubility,phenol content and antioxidant ***,the transparency was reduced which enhanced the film opacity by the addition of *** electronic microscopy(SEM)showed homogeneity between fibers and the constituents of the *** addition of FCPD did not change the FTIR peaks in comparison with starch-based *** hydroxyl index value and water contact angle showed that the hydrophilicity increases with the film FCPD *** addition,the FCPDs have enhanced the microbial biodegradation of the developed films as showed by *** PCR using specific primers for nine target microbial groups showed that fungi were the predominant agent of the *** bacteria,realtime PCR showed thatβ-Proteobacteria,Acidobacteria,Bacteriodetes andα-Proteobacteria groups were involved in film biodegradation.

关键词： Parthenocarpic date Fibers Bioplastic Biodegradation SEM qPCR

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Synthesis of MgAl2O4: Sm3+ Nanophosphor and Its Photoluminescence, Electrochemical Sensing, and Photocatalytic Studies

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Advances in materials science and engineering 2023年第1期2023卷

作者： Manjula, S.N. Chandrasekhar, M. Anil Kumar, M.R. Waqas Alam, Mir Ravikumar, C.R. Murthy, H. C. Ananda Basavaraju, N. Nagabhushana, H. Department of Physics SJR College for Women Rajajinagar Bengaluru India Research Center Department of Science East West Institute of Technology VTU Bangalore560091 India Department of Chemical and Materials Engineering Gina Cody School of Engineering and Computer Science Concordia University MontrealH3G 2W1 Canada Department of Physics College of Science King Faisal University Al-Ahsa31982 Saudi Arabia Department of Applied Chemistry School of Applied Natural Science Adama Science and Technology University P. O. Box 1888 Adama Ethiopia Saveetha University Tamil Nadu Chennai600077 India C.N.R. Rao Center for Advanced Materials Tumkur University Tumkur India

A series of MgAl2O4: Sm3+ nanophosphors were synthesized using oxalyl dihydrazide (ODH) as fuel at low temperature. The X-ray diffraction studies revealed a crystallite size of 20 nm for the nanophosphors. The energy band gap values were found to be in the range from 4.86 to 5.42 eV. Because of distinct f-f transitions from 4F7/2 ← 6P3/2 of Sm3+ ions in the host stimulated at 406 nm, the PL characteristic emission peaks of Sm3+ ions were observed between 406 and 605 nm. The optimized MgAl2O4: Sm3+ phosphors exhibited 97% colour purity and lie in the orange red to yellow area of the CIE diagram. With MgAl2O4: Sm3+ nanophosphors, novel photocatalysts for the elimination of the dye Fast orange red (FOR) have been proved to function at an excited wavelength of 493 nm in UV light. The experiment showed 97.46% dye decolorization, respectively, after 120 min irradiation. Using the carbon paste electrode in the cyclic voltammetry (CV) technique, lead was detected in 0.1N HCl solution (MCPE). The MgAl2O4: Sm3+ nanophosphors are useful sensing material for an element like lead. Finally, we conclude that the synthesized MgAl2O4: Sm3+ nanophosphors are potential candidates for multifunctional applications. © 2023 S. N. Manjula et al.

关键词： Samarium compounds

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Magnetic field induced Weyl state in the van der Waals–type antiferromagnet GdTe3

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Physical Review B 2023年第20期108卷 205132-205132页

作者： Y. M. Wan E.-J. Cheng H.-Y. Ma X. F. Yang X. F. Hou X. J. Chen X. Zhang C. Y. Xi Z. C. Zhong J. P. Liu Y. F. Guo S. Y. Li State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai 200433 China Leibniz Institute for Solid State and Materials Research (IFW-Dresden) Dresden 01069 Germany Max Planck Institute for Chemical Physics of Solids Dresden 01187 Germany School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

GdTe3, a van der Waals–type antiferromagnetic (AFM) metal with high mobility, is gaining a lot of attention for its potential use in high-speed spintronic devices as well as for fundamental physics research. Due to the magnetocrystalline anisotropy of GdTe3, exotic effects are envisaged, when the magnetic configurations interact with an external magnetic field. In this work, a magnetic-field-induced Weyl state in GdTe3 is revealed. In the AFM state, GdTe3 is topologically trivial. However, when an external magnetic field exceeding ∼20 T aligns all spins, band splitting occurs, and then a topological transition is induced, i.e., from a trivial metallic state to a topological Weyl metallic state. In addition, a topological change of Fermi surfaces, i.e., a field-induced Lifshitz transition, is uncovered, which may also be rooted in band splitting. Moreover, high-pressure electrical transport measurements reveal a peculiar superconducting transition with a nearly invariant superconducting transition temperature (Tc∼4.2 K) spanning a wide range of pressure up to 48 GPa. These findings imply that GdTe3 provides a unique platform for investigating not only the interactions of charge-density-wave fluctuations and superconductivity but also the interplay between magnetism and topology.

关键词： Antiferromagnets Superconductors Topological materials

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Anisotropic Behavior of Super Duplex Stainless Steel Fabricated by Wire Arc Additive Manufacturing

SSRN

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SSRN 2023年

作者： Huang, Xianhang Zhang, Xueying Kwok, Chi Tat Niu, Ben Luo, Jiangling Zou, Xiaodong Cao, Yi Yi, Jianglong Pan, Linlin Qiu, Wenfeng Guangdong Provincial Key Laboratory of Advanced Welding Technology China-Ukraine Institute of Welding Guangdong Academy of Sciences Guangzhou China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft Matter South China University of Technology Guangzhou China Department of Electromechanical Engineering University of Macau China Institute of Applied Physics and Materials Engineering University of Macau China

The anisotropic behavior of super duplex stainless steel (SDSS) fabricated by wire arc additive manufacturing (WAAM) remains unclear. The purpose of this study is to investigate the anisotropic behavior between mechanical properties, corrosion resistance, microstructure and crystallographic features of wire arc additive manufactured (WAAMed) SDSS thin-wall component, by means of optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), hardness testing, tensile testing and electrochemical corrosion testing. Meanwhile, a control sample set prepared from commercial hot-rolled SAF 2507 SDSS was also investigated for comparison. The results show that the mechanical properties and corrosion behaviors of WAAMed SDSS are anisotropic, which are attributed to the nonequilibrium phase ratio and anisotropic crystal features in the as-built WAAMed SDSS affected by the repeated thermal cycles inherent to WAAM process. © 2023, The Authors. All rights reserved.

关键词： Anisotropy

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Trigonal warping effects on optical properties of anomalous Hall materials

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Physical Review B 2023年第15期107卷 155415-155415页

作者： Jyesta M. Adhidewata Ravanny W. M. Komalig M. Shoufie Ukhtary Ahmad R. T. Nugraha Bobby E. Gunara Eddwi H. Hasdeo Research Center for Quantum Physics National Research and Innovation Agency (BRIN) South Tangerang 15314 Indonesia Theoretical High Energy Physics Research Division Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung 40132 Indonesia Advanced Functional Materials Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung 40132 Indonesia Department of Engineering Physics School of Electrical Engineering Telkom University Bandung 40257 Indonesia Research Collaboration Center for Quantum Technology 2.0 Bandung 40132 Indonesia Department of Physics and Materials Science University of Luxembourg L-1511 Luxembourg Luxembourg

The topological nature of solids is related to the symmetries present in the material, for example, a quantum spin Hall effect can be observed in topological insulators with time-reversal symmetry, while broken time-reversal symmetry may give rise to the presence of an anomalous quantum Hall effect (AHE). Here, we consider the effects of broken rotational symmetry on the Dirac cone of an AHE material by adding trigonal warping terms to the Dirac Hamiltonian. We calculate the linear optical conductivity semianalytically to show how by breaking the rotational symmetry we can obtain a topologically distinct phase. The addition of trigonal warping terms causes the emergence of additional Dirac cones, which when combined has a total Chern number of ∓1 instead of ±1/2. This results in drastic changes in the anomalous Hall and longitudinal conductivity. The trigonal warping terms also activate the higher-order Hall responses which do not exist in a R-symmetric conventional Dirac material. We found the presence of a nonzero second-order Hall current even in the absence of a Berry curvature dipole. This shift current is also unaffected by the chirality of the Dirac cone, which should lead to a nonzero Hall current in time-reversal symmetric systems.

关键词： Optical conductivity Quantum anomalous Hall effect Topological materials Dirac semimetal

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Surface Modified Perovskite SrCo0.8Fe0.1Nb0.1O3-δ Oxide for Enhanced Electrocatalytic Activity of Oxygen Evolution Reaction

SSRN

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SSRN 2022年

作者： Cao, Xianjun Chen, Tianyi Sun, Siwen Yu, Aimin Sun, Chenghua Leng, Haiyan Wu, Chengzhang State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and Engineering Shanghai University Shanghai200444 China Joint International Laboratory on Environmental and Energy Frontier Materials School of Environmental and Chemical Engineering Shanghai University Shanghai200444 China Department of Chemistry and Biology Faculty of Science Engineering and Technology Swinburne University of Technology HawthornVIC3122 Australia

It is of great significance to develop efficient and inexpensive electrocatalysts for reducing the overpotential of oxygen evolution reaction (OER). The surface of catalysts always plays an important role in catalytic reactions. Herein, we report the improvement of catalytic performance of a perovskite SrCo0.8Fe0.1Nb0.1O3-δ (SCFN) by simple surface treatment with dilute nitric acid. It was found that the acid treatment could partially dissolve the A-site cation of Sr, increase the oxygen vacancy concentration and change the oxidation state of the B-site transition metal. Moreover, the modification method also increased the hydroxide adsorption capacity and concentrations of active oxide species. The OER activity and stability of HNO3 treated sample of SCFN-60 were remarkably improved, and the overpotential was significantly reduced to 360 mV (0.1 M KOH). This work provides a simple strategy for increasing the OER activity of perovskite oxides in an alkaline solution at room temperature. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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Machine learning aided parameter analysis in Perovskite X-ray Detector

arXiv

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arXiv 2024年

作者： Zhang, Bobo Huang, Endai Du, Xinyi Ma, Xiaokang Zhang, Lu You, Jiaxue Jen, Alex K.Y. Liu, Shengzhong Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China Research Institute of Medical and Biological Engineering Ningbo University Zhejiang315211 China Department of Computer Science and Engineering The Chinese University of Hong Kong 999077 Hong Kong Department of Chemical and Biomolecular Engineering National University of Singapore Singapore Singapore National University of Singapore Singapore Singapore State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi’an710072 China Department of Materials Science and Engineering Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Hong Kong Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China University of the Chinese Academy of Sciences Beijing100039 China

Many factors in perovskite X-ray detectors, such as crystal lattice and carrier dynamics, determine the final device performance (e.g., sensitivity and detection limit). However, the relationship between these factors remains unknown due to the complexity of the material. In this study, we employ machine learning to reveal the relationship between 15 intrinsic properties of halide perovskite materials and their device performance. We construct a database of X-ray detectors for the training of machine learning. The results show that the band gap is mainly influenced by the atomic number of the B-site metal, and the lattice length parameter b has the greatest impact on the carrier mobility-lifetime product (μτ). An X-ray detector (m-F-PEA)2PbI4 were generated in the experiment and it further verified the accuracy of our ML models. We suggest further study on random forest regression for X-ray detector applications. © 2024, CC BY.

关键词： Machine learning

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Recent advances in electrochemical removal and recovery of phosphorus from water: A review

Environmental Functional Materials

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Environmental Functional materials 2022年第1期1卷 10-20页

作者： Yifan Ren Wentian Zheng Xiaoguang Duan Nirmal Goswami Yanbiao Liu College of Environmental Science and Engineering Textile Pollution Controlling Engineering Center of Ministry of Ecology and Environmental Donghua University 2999 North Renmin Road Shanghai 201620 PR China School of Chemical Engineering and Advanced Materials The University of Adelaide Adelaide 5005 SA Australia Materials Chemistry Department CSIR-Institute of Minerals and Materials Technology Bhubaneswar 751013 India Shanghai Institute of Pollution Control and Ecological Security 1239 Siping Road Shanghai 200092 PR China

Phosphorus (P) is an essential microelement for biota. Phosphate minerals obtained through subsurface mining are the main sources of P. Phosphate-bearing rocks are nonrenewable and reserves are limited, so overexploitation will cause a shortage of P. However, releasing large amounts of P into water bodies can cause eutrophication. The problems of availability of P and P-related pollution require long-term sustainable responses. Electrochemical P recovery methods have recently been found to offer promise for solving these problems. Here, we describe recent advances in electrochemical methods for removing and recovering P in various forms from aqueous systems and summarize the fundamentals and parameters affecting the methods. The review is not only limited to orthophosphate but also includes non-ortho P and phosphite, which are often overlooked. The economic viabilities of various methods are assessed and the constraints and prospects of the methods are summarized. Improving electrochemical methods will require interdisciplinary research in the fields of electrochemistry, chemical engineering, and environmental science.

关键词： Phosphorus Electrochemical techniques Non-ortho phosphorus Phosphite Removal and recovery

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Plastic accommodation during tensile deformation of gradient structure

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science China materials 2021年第6期64卷 1534-1544页

作者： Xiaolei Wu Muxin Yang Runguang Li Ping Jiang Fuping Yuan Yandong Wang Yuntian Zhu Yueguang Wei State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Mechanics and Engineering Science College of EngineeringBIC ESATPeking UniversityBeijing 100871China Department of Materials Science and Engineering City University of Hong KongHong KongChina

Gradient structure(GS)possesses a typical trans-scale grain hierarchy with varying internal plastic stability,and the mutual plastic accommodation plays a crucial role in its superior strength-ductility *** the in-situ synchrotron X-ray diffraction(XRD)during tensile loading,we measured lattice strains sequentially from the nanostructured(NS)surface layer to the central coarsegrained(CG)layer to elucidate when and how plastic accommodation occurs and evolves within the GS,along with their roles in plastic deformation and strain *** the tensile deformation,two types of plastic incompatibility occur in the *** is an extended elastoplastic transition due to layer-by-layer *** other is strain localization and softening in the NS layer,in contrast with the stable plastic deformation in the CG *** accommodation thus occurs concurrently and manifests as both an inter-layer and intra-layer change of stress state throughout tensile *** produces different micromechanical responses between ***,the NS layer initially experiences strain hardening followed by an elastoplastic *** hetero-deformation induced hardening,along with forest hardening,facilitates a sustainable tensile strain in the NS layer,comparable to that in the CG layer.

关键词： gradient structure plastic accommodation strain hardening nanostructure ductility

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