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学者姓名：刘夏
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Abstract ：
This study presents the development of a highly sensitive and flexible capacitive pressure sensor utilizing an ionic hydrogel dielectric layer with a lateral-bending microstructure. The lateral-bending microstructure was inspired by the deformation response of grass under pressure, which exhibits localized deformation under slight compressive loads. This unique design results in enhanced sensitivity at low pressures (<1 kPa), achieving a sensitivity of 2.79 kPa(-1), significantly outperforming other microstructures. The sensor maintains stable signal changes even after 13 000 cycles of loading stress tests, demonstrating robust reliability and a wide working range from 78 Pa to 11 kPa. The biocompatibility of ionic hydrogels suggests their potential applications in wearable biosensors for monitoring human motion. The digital light processing technique allows for the rapid and cost-effective fabrication of microstructures, contributing to the high performance and versatility of sensors. This research opens new possibilities for the development of intelligent wearable devices with precise tactile sensing capabilities.
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| GB/T 7714 | Qiao, Haidi , Liu, Xia , Zhang, Xingyu et al. A highly sensitive and flexible capacitive pressure sensor based on an ionic hydrogel dielectric layer with a lateral-bending microstructure [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2024 , 12 (34) : 13485-13494 . |
| MLA | Qiao, Haidi et al. "A highly sensitive and flexible capacitive pressure sensor based on an ionic hydrogel dielectric layer with a lateral-bending microstructure" . | JOURNAL OF MATERIALS CHEMISTRY C 12 . 34 (2024) : 13485-13494 . |
| APA | Qiao, Haidi , Liu, Xia , Zhang, Xingyu , Zhang, Jiayue , Yin, Mingjie , Yang, Qingsheng . A highly sensitive and flexible capacitive pressure sensor based on an ionic hydrogel dielectric layer with a lateral-bending microstructure . | JOURNAL OF MATERIALS CHEMISTRY C , 2024 , 12 (34) , 13485-13494 . |
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Abstract ：
Despite the promising applications of hydrogels, their poor mechanical properties still greatly limit their further applications. To improve the mechanical properties of hydrogels, various strategies have been proposed. Hydrogels with nanoparticle-crosslinked polymer networks show excellent toughness, self-recovery, and other advantages, and thus have great prospects for use in tissue engineering, artificial muscles, flexible electronics, and other fields. There have been experimental and theoretical studies of its damage. However, the underlying microscale physical mechanisms have not been fully elucidated. Herein, we established a physics-based constitutive model to describe the mechanical behavior of nanoparticle-crosslinked hydrogels under cyclic loading. The deformation-induced damage and the rate-dependent damage were explained by the network alteration and kinetics of chain dissociation/association, respectively. The kinetics dissociation/association theory was modified considering the polymer chains that wind around nanoparticles. The Mullins stress softening and recovery during cyclic loading were described. Cyclic loading tests on nanoparticle-crosslinked hydrogels were carried out to verify the proposed constitutive model. It is demonstrated that the model can well describe the mechanical behavior of nanoparticle-crosslinked hydrogels during cyclic loading.
Keyword ：
Physics -based model Physics -based model Mullins effect Mullins effect Rate -dependent damage Rate -dependent damage Network alteration theory Network alteration theory Nanoparticle-crosslinked hydrogel Nanoparticle-crosslinked hydrogel
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| GB/T 7714 | Liu, Xia , Jia, Han , Shang, Junjun et al. Stress softening of nanoparticle-crosslinked hydrogels described using a physics-based damage model [J]. | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2023 , 150 . |
| MLA | Liu, Xia et al. "Stress softening of nanoparticle-crosslinked hydrogels described using a physics-based damage model" . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 150 (2023) . |
| APA | Liu, Xia , Jia, Han , Shang, Junjun , Yang, Qingsheng . Stress softening of nanoparticle-crosslinked hydrogels described using a physics-based damage model . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2023 , 150 . |
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Abstract ：
The fabrication of graphene/metal matrix composites by selective laser sintering (SLS) technique has been extensively studied; however, the complex microstructure and residual stress limit their further applications. Herein, the sintering behavior of graphene/aluminum (Gr/Al) composites is studied using an all-atom model. The effect of sintering temperature and Al particle size on densification is investigated based on molecular dynamics (MD) simulations. The results reveal that the higher sintering temperature and smaller particle size are conducive to the improved sintering quality of Gr/Al composites. Then, a large-scale laser sintering model of Gr/Al composites is established and the sintering process is simulated using optimal sintering parameters. The evolution of microstructure and residual stress of Gr/Al composites during SLS are investigated in detail. The results indicate that the epitaxial growth of Al grains plays a dominant role in grain growth, promoting the formation of nanoscale single crystals. Therefore, stress concentration occurs at the voids, microcracks and Gr/Al interfaces, but not at the stacking faults. What's more, the distribution characteristics of residual stress components in Gr/Al composites are affected by Gr/Al interaction.
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| GB/T 7714 | Hao, Xing-Nan , Liu, Xia . Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering [J]. | RARE METALS , 2022 , 41 (11) : 3677-3683 . |
| MLA | Hao, Xing-Nan et al. "Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering" . | RARE METALS 41 . 11 (2022) : 3677-3683 . |
| APA | Hao, Xing-Nan , Liu, Xia . Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering . | RARE METALS , 2022 , 41 (11) , 3677-3683 . |
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Abstract ：
The graphene-reinforced metal matrix composites (Gr/MMCs), prepared by additive manufacturing technology, render a wide range of promising applications. The graphene sheets in Gr/MMCs may get wrinkled during preparation, which renders a significant influence on crystalline texture and deformation behavior. Herein, molecular dynamics models of wrinkled graphene/aluminum (W-Gr/Al) composites are established to study the effect of graphene wrinkle angle on crystal texture of the metallic matrix during the sintering process and mechanical properties of the resulting composites. The results indicate that the sintering temperature significantly affects the molding quality of W-Gr/Al composites, promoting the transformation of sintering mechanism. Furthermore, new wrinkles appear on initially-wrinkled graphene surfaces during the sintering process, resulting in grain boundaries and twin boundaries (TBs), which facilitate the refinement of Al grains. Moreover, uniaxial compression tests reveal that the W-Gr/Al composites sintered at 900 K exhibit the highest Young's modulus and yield strength. It has been demonstrated that the enhancement effect of composite originates from the skeleton network, consisting of wrinkled graphene and TBs. These results provide significant guidance for the design and development of Gr/MMCs.
Keyword ：
graphene graphene wrinkled graphene wrinkled graphene crystallization behavior crystallization behavior metal composites metal composites molecular dynamics simulation molecular dynamics simulation mechanical properties mechanical properties
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| GB/T 7714 | Zhu, Jiandie , Liu, Xia , Wang, Zhangyi et al. Wrinkles-assisted nanocrystalline formation and mechanical properties of wrinkled graphene/aluminum matrix composites [J]. | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING , 2021 , 29 (5) . |
| MLA | Zhu, Jiandie et al. "Wrinkles-assisted nanocrystalline formation and mechanical properties of wrinkled graphene/aluminum matrix composites" . | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 29 . 5 (2021) . |
| APA | Zhu, Jiandie , Liu, Xia , Wang, Zhangyi , Yang, Qingsheng . Wrinkles-assisted nanocrystalline formation and mechanical properties of wrinkled graphene/aluminum matrix composites . | MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING , 2021 , 29 (5) . |
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Abstract ：
The strengthening effect of graphene blocking dislocation propagation in graphene reinforced copper matrix composites (Gr-CMCs) was investigated via molecular dynamics (MD) simulations. Atomic models of Gr-CMCs including an edge dislocation (b = 1/6 (1 1 2)) were built to explore dislocations motion and structure evolution under shear deformation. The effects of the rotation angle and the arrangement of graphene were taken into account. The interaction between the graphene and an edge dislocation, as well as the graphene effect on the dislocation motion, was investigated. The results indicate that the graphene has a significant effect on the motion and velocity of the dislocation. The dislocation velocity decreases significantly when it reaches the graphene, proving a good blocking effect from the latter. In addition to the blocking mechanism, the new dislocation planes that form near the graphene when the rotation angle is greater than 45° also contribute to the strengthening of the Gr-CMCs. Furthermore, the influence of the distance between two abreast graphene sheets on the dislocation motion is discussed. It is found that the strengthening effect can be improved by adjusting the angle and arrangement of the graphene in order to decrease the dislocation velocity and increase the dislocation density. The results of these simulations may provide guidance for the design of future composite materials. © 2020 Elsevier B.V.
Keyword ：
Edge dislocations Edge dislocations Copper Copper Metallic matrix composites Metallic matrix composites Graphene Graphene Molecular dynamics Molecular dynamics Reinforcement Reinforcement
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| GB/T 7714 | Zhu, Jiandie , Liu, Xia , Zhou, Xiaohuan et al. Strengthening effect of graphene-edge dislocation interaction in graphene reinforced copper matrix composites [J]. | Computational Materials Science , 2021 , 188 . |
| MLA | Zhu, Jiandie et al. "Strengthening effect of graphene-edge dislocation interaction in graphene reinforced copper matrix composites" . | Computational Materials Science 188 (2021) . |
| APA | Zhu, Jiandie , Liu, Xia , Zhou, Xiaohuan , Yang, Qingsheng . Strengthening effect of graphene-edge dislocation interaction in graphene reinforced copper matrix composites . | Computational Materials Science , 2021 , 188 . |
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Abstract ：
Nanolaminated metal/graphene composites can have many special mechanical properties, thanks to a high density of interfaces. Even though the interface effect is a key mechanism for the propagation of dislocations in nanolaminated metal/graphene composites, it is not well understood. In this paper, simulations of the molecular dynamics of nanolaminated polycrystalline aluminum/graphene (PAl/Gr) composites are performed. The results provide insight into the grain-size effect on plastic flow stress of nanolaminated PAl/Gr composites and the underlying mechanism. Extended dislocations are found to dominate the plastic deformation of the PAl/Gr composites. Both the PAl/Gr interface and the Al grain boundaries (GBs) interact with the dislocations. Three dislocation propagation forms are observed in the PAl/Gr nanolaminated composite based on the Al grain-size. By decreasing the laminate thickness, the dislocation-GB interaction can transition to a dislocation-graphene interaction. When the Al layer thickness is smaller than the in-plane grain size, the strain-hardening capability is increased due to greater ability of the dislocation/graphene-interface to store dislocations than the GBs. Besides, geometrically necessary dislocations are induced because of the deformation gradient between the graphene and Al grains, which lead to back-stress strengthening and thus strain hardening. Accordingly, a confined layer slip mechanism, which considers back-stress, is used to predict the flow stress of the PAl/Gr composites.
Keyword ：
Aluminum/graphene composites Aluminum/graphene composites Grain-size effect Grain-size effect Molecular dynamics simulation Molecular dynamics simulation Dislocation evolution Dislocation evolution Plastic flow Plastic flow
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| GB/T 7714 | Zhou, Xiaohuan , Liu, Xia , Shang, Junjun et al. Grain-size effect on plastic flow stress of nanolaminated polycrystalline aluminum/graphene composites [J]. | MECHANICS OF MATERIALS , 2020 , 148 . |
| MLA | Zhou, Xiaohuan et al. "Grain-size effect on plastic flow stress of nanolaminated polycrystalline aluminum/graphene composites" . | MECHANICS OF MATERIALS 148 (2020) . |
| APA | Zhou, Xiaohuan , Liu, Xia , Shang, Junjun , Yang, Qingsheng . Grain-size effect on plastic flow stress of nanolaminated polycrystalline aluminum/graphene composites . | MECHANICS OF MATERIALS , 2020 , 148 . |
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Abstract ：
Chemical oxidation of graphite and subsequent exfoliation allow the large-scale production of isolated graphene oxide (GO), in which the induced oxygen-containing functional groups on GO surface were then removed by means of reduction processes. The residual functional groups including carbonyl, hydroxyl and epoxy groups as well as the newly formed defects, significantly influence the physical properties of reduced GO (RGO). Here, RGO structures were generated through a thermal reduction process of GO using molecular dynamics simulations, in which the transformation of functional groups and the formation of non-hexagonal rings/defects were captured. The results suggested the formation of two RGO structures with different contents of functional groups at C/O ratios of about 11 and 13. These structures were obtained using various durations of the thermal reduction process. The dependence of tensile behaviour of RGOs on the structure and chirality as well as the influence of temperature on the tensile properties of RGOs were also evaluated. It was found that the strength and Young's modulus of RGOs decreased as a result of the residual functional groups and newly formed defects, and were decreased with the environment temperature.
Keyword ：
isolated graphene oxide isolated graphene oxide graphene graphene exfoliation exfoliation RGO RGO Young's modulus Young's modulus chirality chirality molecular dynamic simulation molecular dynamic simulation tensile properties tensile properties oxidation oxidation reduction (chemical) reduction (chemical) CO CO mechanical behaviour mechanical behaviour thermal reduction method thermal reduction method graphite graphite tensile strength tensile strength molecular dynamics method molecular dynamics method chemical oxidation chemical oxidation
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| GB/T 7714 | Liu, Xia , Yang, Qingsheng . Molecular dynamic simulation of mechanical behaviour of RGO produced by thermal reduction method [J]. | MICRO & NANO LETTERS , 2017 , 12 (9) : 638-642 . |
| MLA | Liu, Xia et al. "Molecular dynamic simulation of mechanical behaviour of RGO produced by thermal reduction method" . | MICRO & NANO LETTERS 12 . 9 (2017) : 638-642 . |
| APA | Liu, Xia , Yang, Qingsheng . Molecular dynamic simulation of mechanical behaviour of RGO produced by thermal reduction method . | MICRO & NANO LETTERS , 2017 , 12 (9) , 638-642 . |
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