Tribological properties of graphene nanosheets as an additive in calcium grease

Kamel, Bahaa M.; Mohamed, Alaa; El‐Sherbiny, M.; Abed, Kamal; Abd-Rabou, M.

doi:10.1080/01932691.2016.1257390

Cited by 80 publications

(22 citation statements)

References 32 publications

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“…The ethanol and methanol filtrate let dry at room temperature while fluid filtrate dried and thought by the rotating evaporator. The dried rough concentrate was broken down in DMSO independently to the last grouping of 300 mg/ml [8].…”

Section: Plant Extractionmentioning

confidence: 99%

Biofilm, Antimicrobial & Reductive Ability of London Rocket S. irio

Chalabi

Al-Ezzy

Al-Ani

et al. 2019

MRJI

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Sisymbrium irio is a plant used in folk medicine in Asian peoples. In 79 samples collected from hospitals, 71 were infected with Gram-positive bacteria. Performing API 20 samples showed 17(23.94%) were S. pyrogens and 54(76.06%) were S. aureus. In an experiment for antibiotic sensitivity, the samples showed 100% sensitivity to penicillin, cephalexin, cefotaxime, tetracycline, Amoxicillin and methicillin. However, the sensitivity was less in Vancomycin, clindamycin, Rifampin. Moreover, it was resistance to ciprofloxacin. Test tube method used to detectability of pathogenic S. aureus isolates which isolated from the skin of children had impetigo for biofilm formation. The result illustrated the high per cent of S. aureus isolates were able to produce biofilm. 47 (87%) S. aureus isolates produce biofilm with different degree of thickness and only 6 (13%) isolates unable to produce biofilm. The total flavonoids content was determined by spectrophotometer. The ethanol, metabolic and aqueous extract of S. irio as rutin the best standard substance for flavonoids. The best absorbance was methanol extract followed by water then, ethanol extracts. Reductive ability was carried out to know the effect of free radicals. The best extract was methanol followed by ethanol then, water extract.

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Section: Plant Extractionmentioning

confidence: 99%

Biofilm, Antimicrobial & Reductive Ability of London Rocket S. irio

Chalabi

Al-Ezzy

Al-Ani

et al. 2019

MRJI

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“…Alaa et al (Mohamed et al , 2015) examined the effect of adding CNTs in the tribological properties of lithium grease, the result shows that the optimal percentage of CNTs is 1 per cent, which the wear scar diameter decrease about 63 per cent, and the friction reduction decrease about 81.5 per cent. Bahaa et al (Kamel et al , 2017b) enhanced the tribological properties of calcium grease by adding CNTs and GNS, the results show that by adding the nano additives the wear and friction reduction reduced and the EP increased. Wu et al (2017) studied the tribological behavior of TiO 2 nano-additive water-based lubricants, the result shows that the 0.8 Wt.% TiO 2 lubricant gives excellent tribological properties including the lowest coefficient of friction (COF) and the strongest wear resistance under all lubrication conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of MWCNTs/Talc powder nanoparticles on the tribological and thermal conductivity performance of calcium grease

Mobasher

Khalil

Khashaba

et al. 2019

ILT

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Purpose The purpose of this paper is to evaluate the influence of nanoparticles as an additive on the tribological properties of calcium grease. Design/methodology/approach The nano additives in this research are with different concentration of multi carbon nanotubes (MWCNTs) and Talc powder (1, 2, 3, 3 and 5 per cent). The ratio of MWCNTs to Talc powder is 1:1. The tribological properties of hyper MWCNTs/Talc powder to calcium grease were evaluated using a pin-on-disk wear testing. The results show that the nano additives MWCNTs/Talc to calcium grease exhibit good performance in anti-wear and friction reduction. The action mechanism was estimated through analysis of the worm surface with x-ray diffraction and transmission electron microscope. Findings The result indicates that boundary film mainly composed of MWCNT and Talc powder, and other organic compound was formed on the worm surface during the friction test. In addition, the wear rate and coefficient of friction of nanogreases have shown excellent improvement about 80.62 and 63.44 per cent, respectively, at 4 Wt.% of MWCNTs/Talc powder. Moreover, the thermal conductivity of nanogrease increased about 51.72 per cent. Originality/value This study describes the inexpensive and simple fabrication of nanogrease for improving properties of lubricants, which improve power efficiency and extend lifetimes of mechanical equipment.

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“…Although emphasis has been placed on MoS 2 polymorphs, interesting tribological properties have also been reported for other MoS x -based coatings, such as those based on aforementioned Mo 3 S 4 [ 18 ]. These materials may pose an alternative to other nanostructure lubricants [ 19 , 20 , 21 ], in particular to those based on graphene [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Exploration of the Lubricating Behavior of Nanoparticulated Mo15S19 in Linseed Oil

et al. 2018

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Molybdenum chalcogenides present interesting properties beyond their superconducting critical temperatures and upper critical magnetic fields, making them suitable for potential applications in tribology, batteries, catalysis, or thermopower. In this study, Mo15S19 nanoparticles with an average diameter of 10 nm were synthesized via the reaction of ammonium molybdate with hydrochloric acid and elemental sulfur as reducers at 245 °C. The oxidation to MoO3 in air was efficiently avoided by using linseed oil as a reaction medium and dispersant. Scanning electron microscopy (SEM) micrographs of the as-prepared samples revealed the presence of few-micron-size aggregates, while transmission electron microscopy (TEM) characterization evidenced that the samples were polynanocrystalline with a high degree of homogeneity in size (standard deviation of 2.7 nm). The absence of the first-order (00l) reflection in the X-ray diffraction pattern was also indicative of the absence of Mo3S4 stacking, suggesting that it was a non-layered material. A dispersion of the nanoparticles in linseed oil has been studied as a lubricant of steel–steel sliding contacts, showing the formation of a surface layer that reduces wear and mean friction coefficients with respect to the base oil.

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Tribological properties of graphene nanosheets as an additive in calcium grease

Cited by 80 publications

References 32 publications

Biofilm, Antimicrobial & Reductive Ability of London Rocket S. irio

Biofilm, Antimicrobial & Reductive Ability of London Rocket S. irio

Effect of MWCNTs/Talc powder nanoparticles on the tribological and thermal conductivity performance of calcium grease

Synthesis and Exploration of the Lubricating Behavior of Nanoparticulated Mo15S19 in Linseed Oil

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