The Behavior of Colloidal Solid Particles in Elastohydrodynamic Contacts

Chiñas‐Castillo, Fernando; Spikes, H. A.

doi:10.1080/10402000008982354

Cited by 55 publications

(29 citation statements)

References 13 publications

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“…This fact occurs probably because the nanoparticles became as the third body increasing friction and wear. According to Chiñas-Castillo and Spikes 15 , nanoparticles have a harmful effect in some cases. It is also important to consider the chemistry nature of biolubrificants, its polarity promotes the adsorption on metal surface resulting in reduction of friction and wear.…”

Section: Resultsmentioning

confidence: 99%

Study of oxide nanoparticles as additives for vegetable lubricants

et al. 2014

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Currently, vegetable oils have been studied as biolubricants in order to reach new environmental standards. Besides being non-renewable, mineral oils from petroleum bring consequences to the environment due to its low biodegradability. Thus, the aim of this work is to develop a biolubricant and to add oxide nanoparticles (ZnO and CuO) in order to improve abrasion resistance and friction. This product must be biodegradable and has better performance under boundary lubrication. The methodology consisted of the synthesis of biolubricants using vegetable oils (soybean and sunflower) by epoxidation reaction. The tribological performance was evaluated by HFRR (High Frequency Reciprocating Rig). The developed biolubricants showed good tribological properties besides being more adapted to the environment. Also, it was possible to verify that biolubricants without additives are slightly more tribologically effective than lubricants with additives.

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Section: Resultsmentioning

confidence: 99%

Study of oxide nanoparticles as additives for vegetable lubricants

et al. 2014

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“…It has been shown that both copper [212] and nickel [213] nanodispersions reduce friction as well as improve antiwear and seizure performance in sliding contact conditions. Optical interferometry has been used to investigate the film-forming properties of dispersions of gold and silver nanoparticles [214,215]. The particles formed monolayer films on rolling-sliding surfaces but these were quite easily dislodged under high speed conditions.…”

Section: Nanoparticle Additive Research; 1990 To Presentmentioning

confidence: 99%

Friction Modifier Additives

2015

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The need for energy efficiency is leading to the growing use of additives that reduce friction in thin film boundary and mixed lubrication conditions. Several classes of such friction modifier additive exist, the main ones being organic friction modifiers, functionalised polymers, soluble organo-molybdenum additives and dispersed nanoparticles. All work in different ways. This paper reviews these four main types of lubricant friction modifier additive and outlines their history, research and the mechanisms by which they are currently believed to function. Aspects of their behaviour that are still not yet fully understood are highlighted.

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“…The friction reduction and anti-wear action of nanoparticles in lubricant have been reported as colloidal effect, rolling effect, protective film, and third body mechanisms [1]. However, the information about the tribological properties of nanofluids is still contradictory and in some cases the nanofluids show poorer behavior than the base fluid [2].…”

Section: Introductionmentioning

confidence: 97%

Leverage about synthesis and dispersion with cuo nanoparticle in oil lubricating

Mello¹,

Guedes²,

Alves³

et al. 2016

ITEGAM- Journal of Engineering and Technology for Industrial Applications (ITEGAM-JETIA)

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The challenge for nanotechnology application in automotive lubrication is the difficulty in dispersing the nanoparticles in lubricating oils. Some factors have a direct influence on the dispersion of particles, such as size and shape, which are controlled by the chosen synthesis method. In addition, the use of covers and dispersant agents aid the dispersion of nanoparticles in lubricating oils. In this work studied the effect of different amount of energy given during the synthesis of nanoparticles in microwaves, in order to observe its influence on the dispersion size and shape of nanoparticles. They were covered with oleic acid, as well disperse in toluene, improving nanoparticle dispersion. The dispersion in of nanoparticles in oil was observed by physical characteristic, spectroscopy in the visible ultraviolet (UV/VIS) and micrographs (MO). The results showed that the synthesis with higher amount of energy generated a smaller particle size and better dispersion in oil. However the nanoparticle shape is not influenced by energy amount. The use of Oleic acid and toluene improved the dispersion of the nanoparticles in the lubricant oil as observed in the results of UV/ VIS by biggest interparticle distance.Keywords: Nanoparticles, synthesis energy, dispersion in oil.Alavancagem sobre a síntese e dispersão com nanopartículas de CuO em óleo lubrificante RESUMO O desafio para aplicação de nanotecnologia em lubrificação automóvel é a dificuldade em dispersar as nanopartículas em óleos lubrificantes. Alguns fatores têm uma influência direta sobre a dispersão de partículas, tais como tamanho e forma, que são controladas pelo método escolhido de síntese. Além disso, o uso de tampas e agentes dispersantes auxiliam na dispersão de nanopartículas em óleos lubrificantes. Neste trabalho foi estudado o efeito de diferentes quantidades de energia dada durante a síntese das nanopartículas em micro-ondas, a fim de observar a sua influência sobre o tamanho e a forma da dispersão de nanopartículas. Eles foram cobertas com ácido oleico, assim dispersar em tolueno, melhorando a dispersão de nanopartículas. A dispersão em de nanopartículas em óleo foi observada por característica física, espectroscopia no ultravioleta visível (UV/VIS) e micrografias (MO). Os resultados mostraram que a síntese de com maior quantidade de energia gerada uma dimensão de partícula mais pequena e melhor dispersão em óleo. No entanto, a forma de nanopartículas não é influenciada pela quantidade de energia. A utilização de ácido oleico e tolueno melhorou a dispersão das nanopartículas no óleo lubrificante como observado nos resultados de UV / VIS por maior distância interpartículas.Palavras-Chave: nanopartículas, síntese de energia, dispersão em óleo.

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The Behavior of Colloidal Solid Particles in Elastohydrodynamic Contacts

Cited by 55 publications

References 13 publications

Study of oxide nanoparticles as additives for vegetable lubricants

Study of oxide nanoparticles as additives for vegetable lubricants

Friction Modifier Additives

Leverage about synthesis and dispersion with cuo nanoparticle in oil lubricating

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