Study on the nanoscale mechanical properties of graphene oxide–enhanced shear resisting cement

Du, Mingrui; Zhang, Boyang; Li, Pengbo; Zhao, Peng; Su, Haijian; Du, Xueming

doi:10.1515/rams-2022-0052

Cited by 5 publications

(4 citation statements)

References 56 publications

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“…The freshly cleaved HOPG had a very clean and smooth surface after it was submerged into the electrolytes, with observable graphite step heights of ∼1–2 nm (3–6 carbon layers). The initial modulus of the HOPG surface was calibrated to between 18 and 20 GPa …”

Section: Resultsmentioning

confidence: 99%

“…The initial modulus of the HOPG surface was calibrated to between 18 and 20 GPa. 28 In the pure LP50 electrolyte (1), the morphology change above ∼0.9 V was subtle, except for a little disturbance of the scanning probe, which caused the horizontal lines in the images. This phenomenon might be attributed to the complicated local environment of the scanning probe in the liquid, in which the composition is changing due to capacitive and redox processes, as well as electrolyte composition changes; there are numerous factors that could cause artifacts.…”

Section: Electrochemical Analysis Of the Tm-containingmentioning

confidence: 99%

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The Influence of Cathode Degradation Products on the Anode Interface in Lithium-Ion Batteries

Zhang,

Said,

Lovett

et al. 2024

ACS Nano

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Degradation of cathode materials in lithium-ion batteries results in the presence of transition metal ions in the electrolyte, and these ions are known to play a major role in capacity fade and cell failure. Yet, while it is known that transition metal ions migrate from the metal oxide cathode and deposit on the graphite anode, their specific influence on anode reactions and structures, such as the solid electrolyte interphase (SEI), is still quite poorly understood due to the complexity in studying this interface in operational cells. In this work we combine operando electrochemical atomic force microscopy (EC-AFM), electrochemical quartz crystal microbalance (EQCM), and electrochemical impedance spectroscopy (EIS) measurements to probe the influence of a range of transition metal ions on the morphological, mechanical, chemical, and electrical properties of the SEI. By adding representative concentrations of Ni 2+ , Mn 2+ , and Co 2+ ions into a commercially relevant battery electrolyte, the impacts of each on the formation and stability of the anode interface layer is revealed; all are shown to pose a threat to battery performance and stability. Mn 2+ , in particular, is shown to induce a thick, soft, and unstable SEI layer, which is known to cause severe degradation of batteries, while Co 2+ and Ni 2+ significantly impact interfacial conductivity. When transition metal ions are mixed, SEI degradation is amplified, suggesting a synergistic effect on the cell stability. Hence, by uncovering the roles these cathode degradation products play in operational batteries, we have provided a foundation upon which strategies to mitigate or eliminate these degradation products can be developed.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Analysis Of the Tm-containingmentioning

confidence: 99%

The Influence of Cathode Degradation Products on the Anode Interface in Lithium-Ion Batteries

Zhang,

Said,

Lovett

et al. 2024

ACS Nano

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“…In the field of grouting material selection and optimization, new materials have emerged in recent years. Du et al [27] investigated the dynamic properties of cement paste specimens with varying dosages of carbon nanotubes (CNTs) under impact loads. The findings showed that cement paste's dynamic mechanical characteristics were somewhat improved with carbon nanotubes.…”

Section: Inorganic Grouting Materialsmentioning

confidence: 99%

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Du,

Li,

Fang

et al. 2024

Applied Sciences

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China is renowned for its extensive underground engineering projects and the complex geological and hydrological conditions it faces. Grouting treatment technology is widely employed in deep-buried mines and tunnels, where grouting parameters such as materials, pressure, volume, and hole arrangement significantly impact the effectiveness of grouting. This review paper comprehensively examines current research on grouting materials, theories, experiments, and numerical simulations. It summarizes the various factors that must be considered during the grouting process of fissures and explores the diffusion mechanisms of grout under their influence. Furthermore, further research is needed on the mechanisms and treatment methods for poor grouting in rock masses, the distribution patterns of fissures, optimization methods for grouting parameters, and grout quality assessment techniques. Future research should focus on developing more efficient experimental methods with higher accuracy levels while advancing grouting technologies. Establishing comprehensive and accurate rock mass models along with improving monitoring capabilities are also crucial aspects to consider. Therefore, studying the diffusion mechanisms of grout in fissured rock masses is of significant importance for the practical operation of underground engineering projects.

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“…The microstructure of cement-based materials has a significant impact on their mechanical properties and durability, and the microstructure of cement-based materials is closely related to the hydration characteristics of cement and the morphology of hydration products. , When GO is incorporated into cement-based materials, on the one hand, GO can play a certain filling effect and optimize the microstructure of cement-based materials; on the other hand, GO changes the microstructure of cement-based materials when GO affects the content and morphology of cement-hydration products through nucleation and intercalation effects. ,,,, …”

Section: Dispersive Properties Of Gomentioning

confidence: 99%

Catalysis and Regulation of Graphene Oxide on Hydration Properties and Microstructure of Cement-Based Materials

Chen

Xue

et al. 2023

ACS Sustainable Chem. Eng.

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Graphene oxide (GO) is a two-dimensional material that adds functionalized oxygen-containing groups on the surface of graphene through strong acid oxidation. The oxygen-containing functional groups on the surface make GO have good dispersion and surface activity. When GO is incorporated into cement-based materials, while providing nucleation sites for cement hydration, it can also react with ions released by cement hydration. Therefore, GO has a catalytic effect on the hydration process of cement and plays a role in regulating the morphology of the hydration products, which in turn affects the formation of the microstructure of cementbased materials. In this study, the catalytic and regulatory effects of GO on the hydration characteristics, pore structure, and internal interface of cement-based materials are reviewed. The analysis shows that the oxygen-containing functional groups on the surface of GO can absorb a large number of water molecules, promote the dissolution of cement particles in water, and adsorb the Ca 2+ released by cement particles, thereby reducing the concentration of Ca 2+ around the cement particles and shortening the induction period of cement hydration. In addition, GO can provide more nucleation sites for cement hydration and shorten the hydration acceleration period. GO promotes the formation of hydration products through the nucleation effect and gradually transforms needle-like and rod-like hydration products into flower-like or polyhedral-like crystals. In addition, GO optimizes the pore structure of cement-based materials when it affects cement hydration and the morphology of hydration products through the above-mentioned effects. In addition, it makes the connection between hydration products closer through the bridging effect, so that the total porosity of cement-based materials decreases, gel-pore content increases, capillary-pore content decreases, and pore structure is significantly optimized. Finally, while optimizing the pore structure of cement-based materials, GO has an obvious optimization effect on the interface transition zone (ITZ) of cement-based materials, which significantly reduces the ITZ width and increases the ITZ density.

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Study on the nanoscale mechanical properties of graphene oxide–enhanced shear resisting cement

Cited by 5 publications

References 56 publications

The Influence of Cathode Degradation Products on the Anode Interface in Lithium-Ion Batteries

The Influence of Cathode Degradation Products on the Anode Interface in Lithium-Ion Batteries

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Catalysis and Regulation of Graphene Oxide on Hydration Properties and Microstructure of Cement-Based Materials

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