Bioinspired Nacre-like GO-based bulk with easy scale-up process and outstanding mechanical properties

Jia, Huaiming; Li, Yongcun; Luan, Yunbo; Zheng, Yihao; Yang, Jinglei; Wang, Luobin; Guo, Zhangxin; Wei, Xiaodong

doi:10.1016/j.compositesa.2020.105829

Cited by 26 publications

(8 citation statements)

References 31 publications

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“…The flexural strength of the GML bulk was 194.7 ± 9.2 MPa (the specific strength is up to 105.2 ± 5.0 MPa/Mg•m -3 ), which is eleven times higher than that of the pure GO bulk (17.4 ± 3.4 MPa) and two times higher than that of pure SA bulk (78.5 ± 16.2 MPa) and the non-borate/SAimmersed bulk (72.3 ± 3.1 MPa). Even more noteworthy is that our GML bulk represents the highest yield strength among GO-based bulk nanocomposites reported to date 10,12,13 . A joint improvement in the strength (194.7 ± 9.2 MPa) and stiffness (7.0 ± 0.2 GPa) is depicted in Fig.…”

Section: Analysis Of Mechanical Propertiesmentioning

confidence: 88%

“…However, the direct preparation of self-standing GO-based structures from dispersions or gels has largely been limited to highperformance long fibres 5,6 , thin films (or papers) 1,3,[7][8][9] , and lightweight foams (or aerogels) 10,11 . Despite a decade of research efforts, the preparation of GO-based bulk materials with excellent mechanical performance, especially improved flexural mechanical properties, still faces major challenges 12,13 . One of the main barriers lies in a creating strong and controllable micro-and nano-interfaces endows appropriate reinforcement of GO nanosheets or their bridging for jointly strengthening, toughening, and stiffening the assembled bulk nanocomposites, owing to their superior flexibility 13,14 .…”

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confidence: 99%

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Graphene oxide bulk material reinforced by heterophase platelets with multiscale interface crosslinking

et al. 2022

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Graphene oxide (GO) or reduced-GO offer excellent mechanical, electrical and chemical properties. Their nanocomposites have been increasingly explored for attractive applications in diverse fields. However, due to the flexible feature and weak interlayer interactions of GO sheets, flexural mechanical properties of GObased composites especially for the bulk materials are largely restrained, which would hinder their use in real situations. Here inspired by amorphous/crystalline heterophase features within nacreous platelets, we construct a centimetre-sized GO-based bulk, the building blocks of which consist of crystalline GO and amorphous/crystalline MnO2 phases adhered by polymer-based crosslinkers. The GO/MnO2 heterophase layers are stacked and hot-pressed with further crosslinking between the layers to form bulk artificial nacre. The resultant GO/MnO2-based layered (GML) bulk exhibits the highest flexural strength (up to 203.4 MPa) among all of GO-based bulk materials. Moreover, an excellent fracture toughness, a strong impact resistance and light weight are also achieved. Mechanical and simulation analyses corroborate that the highly ordered heterophase structure together with complex crosslinking interactions across multiscale interfaces, lead to superior mechanical properties. We expect that these results provide interesting insights into the design of structural materials and allow the use of high-performance GO-based bulks in engineering and military applications.

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Section: Analysis Of Mechanical Propertiesmentioning

confidence: 88%

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confidence: 99%

Graphene oxide bulk material reinforced by heterophase platelets with multiscale interface crosslinking

et al. 2022

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“…Meanwhile, at the micron length scale, these grains combine to form tablets of width 10–20 μm and 0.5 μm thickness, which are then arranged in a staggered pattern, glued together with biopolymers . Inspired by the nacre’s “brick and mortar” hierarchical structure, the layered polymer nanocomposites offer exceptional mechanical properties, making them useful in fields such as engineering, medicine, environmental applications, etc. − Polyethylene (PE), a thermoplastic polymer, is widely used in various industries due to its exceptional physical and chemical properties. Its lightweight, durability, flexibility, and ability to withstand harsh environmental conditions make it suitable for diverse applications. − On the other hand, graphene (Gr), a two-dimensional carbon material famous for its outstanding mechanical, thermal, and electrical properties, possesses a noteworthy Young’s modulus of approximately 1 TPa, as well as elevated mechanical durability, formidable tensile strength (roughly 130 ± 10 GPa), and elasticity (allowing for up to 20% strain to failure.)…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Viscoelastic Properties of Stacked and Grafted Graphene/Graphene Oxide–Polyethylene Nanocomposites: A Coarse-Grained Molecular Dynamics Study

Singh,

Ranganathan

2024

ACS Omega

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High-performance natural materials with superior mechanical properties often possess a hierarchical structure across multiple length scales. Nacre, also known as the mother of pearl, is an example of such a material and exhibits remarkable strength and toughness. The layered hierarchical architecture across different length scales is responsible for the efficient toughness and energy dissipation. To develop high-performance artificial nacre-like composites, it is necessary to mimic this layered structure and understand the molecular phenomena at the interface. This study uses coarse-grained molecular dynamics simulations to investigate the structure−property relationship of stacked graphene−polyethylene (PE) nanocomposites. Uniaxial and oscillatory shear deformation simulations were conducted to explore the composites' mechanical and viscoelastic behavior. The effect of grafting on the glass-transition temperature and the mechanical and viscoelastic behavior was also examined. The two examined microstructures, the stacked and grafted GnP (graphene nanoplatelet)−PE composites, demonstrated significant enhancement in the Young's modulus and yield strength when compared to the pristine PE. The study also delves into the viscoelastic properties of polyethylene nanocomposites containing graphene and graphene oxide. The grafted composite demonstrated an increased elastic energy and improved capacity for stress transfer. Our study sheds light on the energy dissipation properties of layered nanocomposites through underlying molecular mechanisms, providing promising prospects for designing novel biomimetic polymer nanocomposites.

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“…Various techniques have been proposed to overcome the degradation of assembled GO, such as the use of stretch-induced alignment, biomimetic nacre-like structures, and ionic bonding. ,− Among them, nacre-like structures have been studied extensively because of their outstanding and enhanced mechanical properties. − Nacre, which is a biological composite found in mollusk shells, has a strength that is greater than its weak and brittle constituents by a factor of 1000 . This enhancement is attributed to a distinctive laminated structure involving the alternate stacking of a soft biopolymer and hard aragonite material. , To realize nacre-like structures, several fabrication methods have been investigated, such as layer-by-layer (LbL) assembly, vacuum filtration, and drop-casting. − Among these methods, spin-assisted layer-by-layer (SA-LbL) assembly is one of the most effective methods owing to its ability to appropriately tailor hierarchical structures on the nanoscale. , SA-LbL assembly is a combination of spin-coating and LbL techniques, which are based on complementary interactions between materials such as oppositely charged materials, and it is used to fabricate hierarchical laminated structures. , SA-LbL assembly requires the preparation of a solution-based material .…”

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confidence: 99%

Enabling Selectively Tunable Mechanical Properties of Graphene Oxide/Silk Fibroin/Cellulose Nanocrystal Bionanofilms

et al. 2021

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Enhancing and manipulating the mechanical properties of graphene oxide (GO)-based structures are challenging because the GO assembly is easily delaminated. We develop nacre-like bionanofilms whose in-plane mechanical properties can be manipulated through water vapor annealing without influencing their mechanical properties in the thickness direction. These bionanofilms are prepared from GO, silk fibroin (SF), and cellulose nanocrystals (CNCs) via a spin-assisted layer-by-layer assembly. The postannealing mechanical properties of the films are determined with atomic force microscopy (AFM) bending and nanoindentation, and it is confirmed that the mechanical properties of the bionanofilms are altered only in the in-plane direction. While AFM bending shows Young’s moduli of 26.9, 36.3, 24.3, and 41.4 GPa for 15, 15 annealed, 30, and 30 annealed GO/SF/CNC trilayers, nanoindentation shows reduced moduli of 19.5 ± 2.6 and 19.5 ± 2.5 GPa before and after annealing, respectively. The unaltered mechanical properties of the bionanofilms along the thickness direction after annealing can be attributed to the CNC frame in the SF matrix acting as a support against stress in the thickness direction, while annealing reorganizes the bionanofilm structure. The tunability of the bionanofilms’ mechanical properties in only one direction through structure manipulation can lead to various applications, such as e-skin, wearable sensors, and human–machine interaction devices.

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Bioinspired Nacre-like GO-based bulk with easy scale-up process and outstanding mechanical properties

Cited by 26 publications

References 31 publications

Graphene oxide bulk material reinforced by heterophase platelets with multiscale interface crosslinking

Graphene oxide bulk material reinforced by heterophase platelets with multiscale interface crosslinking

Mechanical and Viscoelastic Properties of Stacked and Grafted Graphene/Graphene Oxide–Polyethylene Nanocomposites: A Coarse-Grained Molecular Dynamics Study

Enabling Selectively Tunable Mechanical Properties of Graphene Oxide/Silk Fibroin/Cellulose Nanocrystal Bionanofilms

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