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Alkyl phosphate modified graphene oxide as friction …

Alkyl phosphate modified graphene oxide (GON-DDP) was successfully synthesized using dodecanol, ethanol amine and self-made graphene oxide (GO) as precursors. The structure and morphology of GON-DDP were characterized by FT-IR, XPS, TG/DSC, SEM and TEM. The characterization results indicate that long alkyl phosphate chains were successfully grafted on GO surface, which guaranteed the ...

Facile fabrication of superparamagnetic graphene ...

Graphene is a two-dimensional sheet material with atomic thickness composed of the honeycomb rings formed by sp 2-bonded carbon atoms 1, 2.The large theoretical specific surface area of graphene ...

One-Step Ball Milling Preparation of Nanoscale CL-20 ...

2018-2-7 · A one-step method which involves exfoliating graphite materials (GIMs) off into graphene materials (GEMs) in aqueous suspension of CL-20 and forming CL-20/graphene materials (CL-20/GEMs) composites by using ball milling is presented. The conversion of mixtures to composite form was monitored by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD).

One-Step Ball Milling Preparation of Nanoscale CL-20 ...

Formation and Decomposition of CO2 Intercalated …

The formation, stability, and decomposition of CO2 intercalated graphene oxide was analyzed by FTIR, TGA-MS, TGA-IR, AFM, and SEM for the first time. We found that the formation starts at 50 °C ...

Understanding Aqueous Dispersibility of Graphene …

2019-3-21 · Understanding Aqueous Dispersibility of Graphene Oxide and Reduced Graphene Oxide through pKa Measurements

Nanocomposite Materials of Alternately Stacked …

Abstract. We synthesized the novel nanocomposite consisting alternately of a stacked single graphene sheet and a monolayer by using the graphite intercalation technique in which alkylamine molecules help intercalate large molecules into the graphite. Moreover, it is found that the intercalated molecules can rotate in between single graphene sheets by using NMR measurements.

Friction

Elomaa O, Singh V K, Iyer A, Hakala T J, Koskinen J. Graphene oxide in water lubrication on diamond-like carbon vs. stainless steel high-load contacts. Diamond Relat Mater 52: 43-48 (2015) [31] Li J C, Zeng X Q, Ren T H, van der Heide E. The preparation of graphene oxide and its derivatives and their application in bio-tribological systems.

Epitaxial Graphene Intercalation: A Route to Graphene ...

2019-5-23 · graphene capping layer.64,65 While intercalation of Ag through graphene on native metal substrates has been performed with mixed success, 66–68 we show that EG/SiC may be reliably intercalated with Ag to realize encapsulated, 2D-Ag films for plasmonic applications.

Graphene: from synthesis to engineering to biosensor ...

Graphene and carbon nanotubes (CNTs) are two of the most studied materials in recent years. There is an increasing interest in two-dimensional (2D) graphene due to its unique electrical properties like very high carrier mobility, the quantum Hall effect (QHE) at room temperature and ambipolar electric field effect along with ballistic conduction of charge carriers [1 ‒ 5].

Graphene–Graphene Interactions: Friction, …

Christopher D Williams, Martin Lísal, Coarse grained models of graphene and graphene oxide for use in aqueous solution, 2D Materials, 10.1088/2053-1583/ab6f0c, 7, 2, (025025), (2020). Crossref Gabriele Losi, Paolo Restuccia, M C Righi, Superlubricity in phosphorene identified by means of ab initio calculations , 2D Materials, 10.1088/2053-1583 ...

Frontiers | Methods to Scale Down Graphene Oxide …

Graphite oxide, obtained from the oxidation of graphite, can be exfoliated in solution to form graphene oxide (monolayer) (GO), or partially exfoliated to form few-layers graphene oxide (Bianco et al., 2013). GO, initially considered as an intermediate of one of the graphene production processes, has become a material that can be considered ...

Frontiers | Study of Janus Amphiphilic Graphene …

Janus amphiphilic graphene oxide (JAGO), modified by dodecylamine on one side of graphene oxide (GO), was investigated for its novel use as a shale inhibitor. JAGO was synthesized by the Pickering emulsion template technology and was characterized by the Fourier-transform infrared spectra, UV-vis spectra, and transmission electron microscopy.

Frontiers | Study of Janus Amphiphilic Graphene …

Energy efficient reduced graphene oxide additives ...

Optimized concentration of reduced graphene oxide (rGO) in the lube is one of the important factors for effective lubrication of solid body contacts. At sufficiently lower concentration, the lubrication is ineffective and friction/wear is dominated by base oil. In contrast, at sufficiently higher concentration, the rGO sheets aggregates in the oil and weak interlayer sliding characteristic of ...

Energy efficient reduced graphene oxide additives ...

2016-1-4 · However, lubrication of graphene and concentration dependent lubricity mechanism in the literature is poorly understood. Schluter et al. showed that thermally reduced graphene oxide (TRGO) containing lubricant significantly enhanced the friction and wear properties 26. It is predicted that the enhancement in above properties are attributed to ...

Carbon quantum dots: An innovative additive for …

Water soluble carbon quantum dots (CQDs) were prepared and used as lubricant additives in deionized (DI) water. The impacts of CQDs on the tribological properties of water were evaluated for both Si 3 N 4 -on-steel and Si 3 N 4 -on-Si 3 N 4 contacts. Experimental results show that the coefficient of friction (COF) reduced in the two types of tribopairs after the addition of CQDs.

Graphene Directory - List of Graphene Related ...

Graphene oxide is being widely researched for an extensive range of applications. Reports include the advantageous use of graphene oxide in studies looking at electrode materials in batteries, the improved thermal stability of polymers, support materials for catalysts and many, many more. XG Sciences

Nano graphene-modified lubricant - Zhamu, Aruna

2011-2-24 · The nano graphene platelets can contain pristine graphene, graphene oxide, or a combination thereof. The lubricant properties that can be significantly improved by NGPs include, but are not limited to, friction, wear, viscosity, electrical conductivity, thermal conductivity, thermal stability, and molecular film formability (between working parts).

The Correlation Between Molecular Structure and ...

Eight kinds of GOs with different oxidation degree were synthesized. Molecular structure characterization indicated that with more usage of H2SO4, less usage of KMnO4, and more reaction time at high temperatures (95 °C), the oxidation degree of GO decreased. Tribological tests showed that GO water suspensions could reduce the friction coefficient of water by 33–46% as well as decrease the ...

Rapid Thermal Characterization of Graphene Oxide ...

The use of solid lubricants such as graphene, graphene oxide, and other nanoparticles have gained notable attention in the tribological community to reduce friction and wear thus aiming at improved energy efficiency and sustainability. Tribological experiments unify rather extreme conditions such as high contact pressures, small contact areas, relative sliding motion, and rapid heating.

Facile fabrication of superparamagnetic graphene ...

Graphene is a two-dimensional sheet material with atomic thickness composed of the honeycomb rings formed by sp 2-bonded carbon atoms 1, 2.The large theoretical specific surface area of graphene ...