Electrical and Chemical Properties of Graphene over Composite Materials: A Technical Review

Abstract

Graphene is a material that has superior mechanical, electrical, and thermal properties. It has drawn the attention of many scientific researchers for this purpose. In this paper, three different types of fillers, GNPs, MWCNTs and EG reinforced epoxy nanocomposites were mainly studied. Different shear mixing speeds and shear mixing times were considered during the study of the nanocomposites with 0.1 wt% loading of the fillers. The effects of various types of fillers and different shear mixing speeds and durations on mechanical and electrical properties of the final composites were examined. The GNPs-reinforced epoxy nanocomposite was the only one that showed a 13% improvement in elastic modulus as compared to pure epoxy when the shear mixing conditions were 3000 rpm for 2 hours. The research also studied the effects of different loadings of GNPs and the addition of acetone as a solvent on the final mechanical, electrical and thermal properties of the composites (with the fixed shear mixing speed and time). The tensile strength of the composites reduced drastically when the loading of GNPs increased while the elastic modulus shows some increase with the growth in GNP loading. The study found that GNPs reinforced composites did not show the percolation threshold even with 5 wt% (with the ratio to the weight of epoxy) loading of the GNPs. The GNPs-reinforced epoxy composites showed an 116% improvement in the thermal conductivity as compared to the pure epoxy samples when the GNPs loading was 5 wt%. The results from the studied literatures also showed that the samples prepared with the addition of acetone had higher thermal diffusivity than the samples prepared without acetone.

Carbon-Based Functional Nanomaterials as Tools for Controlling the Kinetics of Tribochemical Reactions

“…During friction, the molecules of the lubricating additive are subjected to the action of solids, as well as the components present in the protective layer created by the lubricant. A large body of literature data suggests that lubricity additives undergo tribocatalytic reactions [7][8][9][10][11][12][13][14][15][16]. In this case, the triboreaction rate depends not only on the heat generated during friction but also on the tribocatalytic effect.…”

Graphene-Based Metal–Organic Framework Hybrids for Applications in Catalysis, Environmental, and Energy Technologies

“…10 000 scientific articles published every year, plus the 2013 launch of Graphene Flagship as a €1 billion European Union scientific research initiative) which is a testament to the unique combination of graphene’s extraordinary properties. Thanks to its high thermal as well as electrical conductivity and theoretical surface area of 2630 m 2 /g, − such a rich confluence of record-high physical and chemical properties endorses the proverbial expression “wonder material” for graphene . Notably, the ultrathin thickness (ideally a single molecular layer) and the large lateral extension endow graphene-based materials with properties suitable for membranes used in environmental applications, specifically those with high flux and low transparent resistance. − In addition, the smart integration of MOFs with graphene and its derivatives was shown to significantly enhance the efficiency of energy conversion and storage devices while reducing their fabrication costs, thereby creating new opportunities for real-world applications.…”

Complete terahertz absorber: coupled topological like structure, spaced graphene and magneto-optic effect

“…In addition to PCs, these structures also include materials such as chalcogenides, metals, and graphene and their special characteristics. 13) However, due to the extraordinary physical, chemical, and electrical properties of graphene, 14) it's widely recommended for this purpose, as well as to maintain the structure in an alldielectric configuration.…”