Strain-dependent elastic properties of graphene oxide and its composite

Xia, Zhao; Wang, C.G.; Tan, Huifeng

doi:10.1016/j.commatsci.2018.03.061

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The mechanical properties of the unit cell were calculated by using the constant strain method. Using the Voigte-Reusse-Hill method [37], the calculated Young's modulus of the GO is 294 GPa, which is consistent with the experimentally obtained values by Xia and Suk [38,39]. The molecular model of the GO after optimisation is shown in Fig.…”

Section: Molecular Modellingsupporting

confidence: 86%

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

Xu¹

2020

Ceramics - Silikaty

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Graphene oxide (GO) has attracted increasing attention for its application in cementitious materials as it can be used to regulate the hydration products of cement and improve the properties of cement composites. This paper investigated the role of GO on the hydration process and chemical shrinkage of a cement paste through an experimental study and molecular dynamics simulation. The hydration heat flow of a cement composite with GO (CCG) was characterised by using an isothermal calorimeter. The chemical shrinkage of the CCG was also measured by applying a modified method based on ASTM C1608. The test results have shown that incorporating GO can mainly accelerate the hydration rate of cement composites at the early stage, but would not change the four-stage process of the cement hydration. The addition of GO by 0.3 wt% of cement is able to reduce the chemical shrinkage of the cement composites. This regulation effect is mainly attributed to the hydrogen bonding, which has been verified by the molecular dynamics simulation.

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Section: Molecular Modellingsupporting

confidence: 86%

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

Xu¹

2020

Ceramics - Silikaty

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“…The UHMWPE/0.1GO particles seem to be similar to the Figure 6B flattened particles. This can mean that the UHMWPE/0.1GO was easily deformed as in UHMWPE/1.0GF, which is likely due to its low elastic modulus resulting from hydroxyl groups which alter many intrinsic physical properties of its composites 55 . Lastly, in Figure 6D, UHMWPE/1.0GO, a thread‐like structure can be seen on a well‐consolidated particle described as web‐like morphology formation of networks between the particles.…”

Section: Resultsmentioning

confidence: 95%

The relations between wear behavior and basic material properties of graphene‐based materials reinforced ultrahigh molecular weight polyethylene

Shahemi

Liza

Sawae

et al. 2021

Polymers for Advanced Techs

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This article aims to investigate the influence of reinforcing graphene oxide (GO) and graphite flakes (GF) fillers into ultrahigh molecular weight polyethylene (UHMWPE) for orthopedic application. These fillers were expected to physically bond to UHMWPE, thus can enhance the subsurface strength, improving the wear behavior of the composites. UHMWPE/GO and UHMWPE/GF composites were prepared at 0.1 and 1.0 wt% by melt‐blending, followed by a compression molding technique. A multidirectional pin‐on‐disc wear test was performed to simulate the kinematic of hip application. Whilst getting exposed in the artificial in‐vivo lubricant bath (30 v/v% diluted bovine serum). Following this, the wear mechanism fostered by each filler (GO and GF) was determined by wear features obtained from the optical microscope and scanning electron microscope (SEM). The crystallinity degree and crystal defect were assessed using x‐ray diffraction (XRD). The mechanical properties of fabricated composites were evaluated by using a universal testing machine and Vickers microhardness. We found that UHMWPE/GO has the lowest specific wear rate due to the improved subsurface strength, as the reduction of a weak adhesive point was observed on the worn surface. Meanwhile, higher GF content (1 wt%) in UHMWPE displayed a lower specific wear rate than neat UHMWPE after completing the 10 km sliding distance attributed to the filler resurfaced, responsible for providing a strong resistance of the shear stress applied upon sliding with the metal counterface. Interestingly, the hardness and tensile strength for both UHMWPE/GO and UHMWPE/GF increased, although the crystallinity percentage was declining compared to neat UHMWPE.

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“…Owing to its superior mechanical and physical properties, such as ultra-high-strength (~25 GPa) [1,2], large surface area ( 736.6 m 2 /g) [3] and multiple surface functional groups [4,5], graphene oxide (GO), is widely studied as one of the best candidate materials for nanoreinforcement in many composites, including polymers [6][7][8][9], metals [10][11][12] and cementitious composites [13,14]. Of these, GO-reinforced cementitious composites have drawn great attention in recent years [14].…”

Section: Introductionmentioning

confidence: 99%

The interaction of graphene oxide with cement mortar: implications on reinforcing mechanisms

et al. 2022

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A comprehensive insight into the interactions between cementitious matrices and graphene oxide (GO) remains critical to the understanding of fundamental factors, such as reinforcing mechanisms, governing the engineering performance of cement composites. Herein, for the first time, this study investigated the snubbing effect on the interaction of GO in cement mortar.Molecular dynamic (MD) simulations were performed to pull out GO sheets from the mortar matrix from different angles. Simulation results showed that the increase of pull-out angle led to an up to a 4-fold increase of the bridging stress of GO, which confirmed the critical role that the snubbing effect played on the reinforcing mechanism of GO. To further understand the snubbing effects, interactions between GO and mortar matrix were analysed from both physical and chemical perspectives, showing the increase of bridging stress caused by pull-out angles is mainly attributed to the enhanced mechanical interlocking and the facilitated formation of interfacial bonds. Based on these findings, an analytical model was developed to quantify the key parameters of the snubbing effects, including snubbing coefficient, adhesion band, friction and strain-hardening coefficient, which guides design inputs of GO reinforced cementitious composites.

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Strain-dependent elastic properties of graphene oxide and its composite

Cited by 8 publications

References 38 publications

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

The relations between wear behavior and basic material properties of graphene‐based materials reinforced ultrahigh molecular weight polyethylene

The interaction of graphene oxide with cement mortar: implications on reinforcing mechanisms

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