Nanolubricants developed from tiny CuO nanoparticles

Alves, Salete Martins; Mello, Valdicleide Silva e; Faria, Edália Azevedo de; Camargo, A. P. P.

doi:10.1016/j.triboint.2016.01.050

Cited by 119 publications

(45 citation statements)

References 30 publications

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“…Figure 7. The nanoparticle size and nanoparticle dispersion stability in 10 researches (from up to buttom, left to right: [24], [10,43], [55], [74], [57], [53]) using surfactant surface modification.…”

Section: Size Effectsmentioning

confidence: 99%

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

2019

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Nanolubricants have attracted great interest due to the promise of friction and wear reduction by introducing nanoparticles. To date, the foremost challenge for developing a new nanolubricant is particle suspension. To understand the mechanisms of nanoparticle dispersion and identify bottlenecks, we conducted a comprehensive review of published literature and carried out an analysis of dispersion based on available data from the past 20 years. This research has led to three findings. First, there are two primary methods in dispersion: formulation with dispersant and surface modification. Second, surfactant and alkoxysilanes are primary chemical groups used for surface modification. Third, functionalization using surfactant is found to be suitable for nanoparticles smaller than 50 nm. For larger particles (>50 nm), alkoxysilanes are the best. The existence of a critical size has not been previously known. To better understand these three findings, we conducted an analysis using a numerical calculation based on colloidal theory. It revealed that a minimal thickness of the grafted layer in surfactant-modified nanoparticles was responsible for suspending small nanoparticles. For larger nanoparticles (>50 nm), they were suitable for silanization of alkoxysilane due to increased grafting density. This research provides new understanding and guidelines to disperse nanoparticle in a lubricating oil.

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Section: Size Effectsmentioning

confidence: 99%

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

2019

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“…Various studies in this context reveal that the performance of a lubricant mainly depends on the number of factors which includes: concentration, nanoparticles size, normal load, sliding velocity, surface roughness and most importantly the sliding pairs. Alves et al (2016) revealed that tiny particles have large potential to reduce the friction and wear particularly at low concentrations. In the same context, Reeves et al (2013) observed that an appropriate size of nanoparticles and composite surface roughness are also important parameters for better friction and wear characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Chou and Lee (2010) reported that the wear mechanism for steel/aluminum alloy contacts is entirely different from steel/steel contacts. However, in most of the cases, the improvement in tribological properties is due to the ball bearing effect (Wu et al 2007), mending effect (Liu et al 2004;Ç elik et al 2013), polishing effect (Nunn et al 2015) and protective film formation capabilities (Battez et al 2007;Alves et al 2016) of different nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Tribological investigation of diamond nanoparticles for steel/steel contacts in boundary lubrication regime

Raina

Anand

2017

Appl Nanosci

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This paper presents an investigation of nanodiamond additives (ND) in combination with copper oxide (CuO) and hexagonal boron nitride (h-BN) particles mixed in PAO (poly-alpha-olefin) oil. The experimentation was performed for a ball on disc configuration using steel/steel contacts in the boundary lubrication regime. The loads were varied from 20 to 100 N and sliding velocity was kept constant at 0.58 m/s. The wear behavior was evaluated using SEM images of the worn-out disc surfaces. EDS analysis of the samples was performed to find out the chemical content of the worn surfaces. Results obtained therein demonstrated that oil containing CuO/ND and h-BN/ND exhibited better frictional and wear characteristics. For CuO/ND containing lubricant, the maximum decrease in friction coefficient is 15.45% in comparison to the CuO oil, whereas for h-BN/ND containing additives the overall decrease is 25.45%. It was observed that the combined effect of CuO/ND and h-BN/ND due to their intrinsic characteristics led to the overall improvement in lubrication properties of the base oil.

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“…In most of the studies carried out, it is noted that the addition of NPs to the lubricant can increase its tribological characteristics, which largely depend on the composition of the lubricant [39,47,[52][53][54][55][56][57][58].…”

Section: Composition Of Metal-containing Nanolubricantsmentioning

confidence: 99%

Metal-containing nanomaterials as lubricant additives: State-of-the-art and future development

2019

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This review focuses on the effect of metal-containing nanomaterials on tribological performance in oil lubrication. The basic data on nanolubricants based on nanoparticles of metals, metal oxides, metal sulfides, nanocomposities, and rare-earth compounds are generalized. The influence of nanoparticle size, morphology, surface functionalization, and concentration on friction and wear is analyzed. The lubrication mechanisms of nanolubricants are discussed. The problems and prospects for the development of metal-containing nanomaterials as lubricant additives are considered. The bibliography includes articles published during the last five years. Friction 7(2): 93-116 (2019) | https://mc03.manuscriptcentral.com/friction Friction 7(2): 93-116 (2019) 97 |www.Springer.com/journal/40544 | Friction http://friction.tsinghuajournals.comFriction 7(2): 93-116 (2019)

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Nanolubricants developed from tiny CuO nanoparticles

Cited by 119 publications

References 30 publications

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

Tribological investigation of diamond nanoparticles for steel/steel contacts in boundary lubrication regime

Metal-containing nanomaterials as lubricant additives: State-of-the-art and future development

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