Preparation and tribological properties of Phenyl-Functionalized thermally reduced GrapheneOxide

Ding, L.; Li, Shimin; Yuan, Xiaoya; Chang, Won; Li, Chuanqiang; Zheng, Xiaohui

doi:10.1016/j.ces.2023.118869

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Modified graphite has carboxylic acid and epoxide groups and produces carbon dioxide and carbon monoxide gas during thermal decomposition around 200 C. However, the DTG diagrams of graphite and graphite after elimination reaction (PRGO) have no obvious maximum thermal cracking temperature at 200 C. Because most of the hydroxyl groups contained in PRGO are dehydrated to form double bonds, they have good thermal stability. After GO was reduced with sodium borohydride, a slight thermal degradation occurred at around 500 C. This can be attributed to the degradation of the cross-linked structure resulting from unstable aromatic hydrocarbons and phenolics [79][80][81][82]. From the FTIR spectrum, it is evident that the structure of GO is primarily characterized by epoxy groups and carboxylic acids.…”

Section: Tga Of Graphite and Modified Graphitementioning

confidence: 99%

“…Compared with MCG, MCT, MCGT-1, and MCGT-2, the thermal conductivity of the MCGT-1, which contains both graphene and CNTs, increased by 150.71% due to the synergistic effect of graphene and CNTs resulting from their different geometric structure [75][76][77][78][79][80][81][82][83][84][85][86][87]. In addition, MCGT-1 has a better ratio of graphene and CNTs for constructing the thermally conductive pathways in the matrix.…”

Section: Thermal Conductivity Analysis Of Solar Thermal Storage Compo...mentioning

confidence: 99%

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The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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BackgroundIn this study, a series of phase change composites were developed. Phase change materials (PCMs) are substances with a high heat of fusion, thereby possessing great potential for solar thermal storage. However, their disadvantages, such as low thermal conductivity, phase separation, and supercooling, limit their further applications.ObjectiveIn this study, magnesium nitrate hexahydrate (MNH) was used as the phase change material, and different proportions of photothermal materials were added to improve the thermally conductive property and solar thermal storage efficiency of MNH.MethodsThis study used magnesium nitrate hexahydrate (MNH) as the substrate. In addition, different proportions of photothermal materials (carbon nanotubes, nano‐graphite, graphene, and partially reduced graphene oxide) were added to promote the efficiency of thermal energy storage. Additionally, a fixed ratio of carboxy methyl cellulose (CMC) was added. The phase change temperature and enthalpy change of the phase change material samples were explored and analyzed by differential scanning calorimeter (DSC). In addition, the thermophysical properties, photothermal storage performance, and thermal reliability analysis of the samples were investigated.ResultsThe results showed that the PCM composites prepared with nano‐graphite have higher latent heat and longer time of phase change. However, the composites prepared with carbon nanotubes (CNTs) have lower latent heat and a shorter time of phase change. Therefore, the partially reduced graphite oxide (PRGO)‐containing composites can retain the latent heat storage capacity of nano‐graphite and decrease the time of phase change, thereby improving the photothermal storage efficiency. The results reveal that the solar thermal storage efficiency of the composite with both CNTs and PRGO could reach up to 0.716.ConclusionsMCGOT‐1 and MCGOT‐2 have high latent heat values, and the phase transition time is short. Therefore, the thermal energy storage efficiency can be as high as 0.716. In addition, compared with related literature, the photothermal storage efficiency of MCGOT‐2 increased by about 2 times. Therefore, the environmentally friendly composites developed in this study have a high potential to be used in solar energy storage and energy‐saving systems.

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Section: Tga Of Graphite and Modified Graphitementioning

confidence: 99%

Section: Thermal Conductivity Analysis Of Solar Thermal Storage Compo...mentioning

confidence: 99%

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

View full text Add to dashboard Cite

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Synthesis of lubricant additive for castor oil: A green and fast approach

Wang,

Liang,

Wang

et al. 2024

Journal of Molecular Liquids

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Functionalization of graphene oxide via epoxide groups: a comprehensive review of synthetic routes and challenges

Gonçalves,

Costa,

Martinez

et al. 2024

Front. Carbon

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Graphene oxide (GO) has attracted significant attention from the scientific community due to its mechanical, optical, electrical, and chemical properties. This review outlines synthetic methods for GO functionalization, including those involving covalent and noncovalent bonds with organic molecules. In a novel contribution to this field, particular emphasis is placed on functionalization via epoxy ring opening, a poorly studied and understood topic. We first provide an overview of the basic structure and properties of graphene oxide. We then explore the various methods employed to functionalize graphene oxide, noting the complexity of these reactions, which sometimes occur in a non-specific manner. However, there are some strategies for targeted functionalization. Furthermore, we present a critical analysis of the covalent functionalization through epoxy groups, demonstrating important aspects to be considered when choosing the reaction medium. An alkaline environment seems to favor this reaction, and there is no consensus regarding the advantages and disadvantages of using basic pH in functionalization reactions. We also demonstrate some challenges involving the characterization and confirmation of the functionalization, mainly in the basal plane, and we show advances in characterization techniques that can be explored in future studies. Finally, some current challenges and future research directions are presented to contribute to the advancement of the field.

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Preparation and tribological properties of Phenyl-Functionalized thermally reduced GrapheneOxide

Cited by 3 publications

References 25 publications

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Synthesis of lubricant additive for castor oil: A green and fast approach

Functionalization of graphene oxide via epoxide groups: a comprehensive review of synthetic routes and challenges

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