Lipophilic magnetite nanoparticles coated with stearic acid: A potential green and low cost way to improve thermal stability and tribological properties of fully formulated low viscosity engine oils

Zuin, Andre; Cousseau, Tiago; Sinatora, Amilton; Toma, Henrique E.

doi:10.1016/j.triboint.2020.106209

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…The results indicate that nanoparticle addition enables delayed degradation or evaporation of nanolubricant under higher temperature. This result conforms with the findings of Zuin et al (2020) that addition of nanoparticles to base lubricants promotes oil retention by the enhanced nanolubricants at elevated temperature in comparison with the base oil. Figure 5 indicates the determination of oxidation onset temperature .…”

Section: Resultssupporting

confidence: 92%

“…Thermal degradation occurs at temperatures higher than the oxidation temperature of oils and thus the usability of any lubricant is dependent on its oxidation stability (Stachowiak and Batchelor, 2013; Mannekote and Kailas, 2012). Thus, the use of nanoparticle as additives to base oils improve oxidation stability due to enhancement of their thermal properties (Rasheed et al , 2016a, 2016b; Zuin et al , 2020, 2017). Thermal degradation of base lubricants with dispersion of nanoparticles is retarded for about 10 min due to improved oxidation onset temperature of base oil with dispersion of GNPs (Rasheed et al , 2016a, 2016b).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Sadiq

Suhaimi

Safian

et al. 2022

ILT

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Purpose The purpose of this study is to evaluate the potentials of nano-additives in enhancement of oxidation and thermal stability of biolubricants thereby, improving the resistance of dispersed nanolubricants to thermal degradation under elevated temperature. Design/methodology/approach This study evaluates the oxidation stability and tribological performance of nano-enhanced biolubricants. Graphene and maghemite nanoparticles at 0.1% volume concentration were dispersed into coconut oil. Oxidation stability was analysed using a thermal analyser to understand the effect of nano-additives on thermal degradation of lubricants under increasing temperature. In addition, tribological performance and viscosity of the tested lubricants were evaluated using a four-ball friction tester and viscometer according to American Society for Testing and Materials standards. Findings The results reveal that the oxidation stability of biolubricants dispersed with nano-additives improves due to delayed thermal degradation. The nano-enhanced biolubricants’ oxidation onset temperature was delayed by 18.75 °C and 37.5 °C, respectively, for maghemite (MGCO) and graphene (XGCO) nanolubricants. This improvement imparts the performance viscosity and tribological performance positively. For graphene-enhanced nanolubricant, 10.4% and 5.6% were reduced, respectively, in coefficient of friction (COF)and wear scar diameter (WSD), whereas 3.43% and 4.3% reduction in COF and WSD, respectively, for maghemite-enhanced nanolubricant compared with coconut oil. The viscosity index of nanolubricants was augmented by 7.36% and 13.85%, respectively, for maghemite and graphene nanolubricants. Research limitations/implications The excellent performance of nanolubricants makes them suitable candidate as sustainable lubricants for machining with regard to environmental benefits and energy saving. Originality/value The effect of graphene and maghemite nanoparticles on the oxidation stability and tribological performance of biolubricants has been investigated. It is an original work and yet to be published elsewhere.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Sadiq

Suhaimi

Safian

et al. 2022

ILT

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“…Unfortunately, most metal sulfide nanoparticles (especially naked nanoclusters) are intrinsically unstable and easy to aggregate or corrode in practical working conditions due to their large specific surface area and high surface energy, eventually leading to precipitation when added to oils, which highly limits their application in the field of lubricant additives [22]. Capping nanoparticles with a monolayer of organic molecules is a convenient way to stabilize inorganic nanoparticles and prevent oxidation or aggregation, which also provides a method to synthesize organic-inorganic composites with controllable surface properties [12,23].…”

Section: Introductionmentioning

confidence: 99%

Tribo-Dependent Photoluminescent Behavior of Oleylamine-Modified AgInS2 and AgInS2-ZnS Nanoparticles as Lubricant Additives

et al. 2023

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The content of Cu2+ in lubricants is an essential indicator for determining the quality of the lubricant and predicting mechanical failure. Finding an effective and sensitive method for detecting Cu2+ in lubricants is of great importance in oil monitoring. In this work, AgInS2 (AIS) and AgInS2-ZnS (ZAIS) nanoparticles (NPs) were synthesized by a simple one-step approach via in-situ surface modification by oleylamine. The as-synthesized AIS and ZAIS NPs exhibit good dispersion stability in various apolar media. The photoluminescence (PL) of AIS and ZAIS NPs as lubricating additives could reflect and monitor the lubrication state of steel-copper pairs due to the quenching effect of Cu2+ from the friction process. With an optimum concentration of 0.5 wt% in paraffin oil, the friction coefficient of the AIS and ZAIS NPs at 100 N was decreased by 56.8 and 52.1% for steel-steel contacts, respectively. ZAIS was observed to be more effective than AIS in improving anti-wear (AW) and extreme pressure (EP) properties, with a load-bearing capacity of up to 1100 N. Characterization of the wear tracks by SEM and XPS indicates that a tribofilm composed of metal sulfides and oxides was formed during the lubricating process. This work not only reveals AIS and ZAIS NPs as a new class of promising candidates for lubricating additives but also unveils their potential for monitoring lubricant conditions and exploring lubricant service life.

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“…Observou-se que, em taxas de cisalhamento de 10 −6 , a viscosidade desses lubrificantes diminuiu à temperatura de 40 • C, indicando uma transição para um comportamento não-Newtoniano. Esse resultado é particularmente relevante para aplicações com altas velocidades de operação, como as encontradas no setor automotivo(BAIR et al, 2011), uma vez que as taxas de cisalhamento, em geral, ultrapassam valores de 10 −7 s. Resultados semelhantes foram encontrados porZheng et al (2018) em seu estudo sobre a viscosidade de lubrificantes de motor em altas taxas de cisalhamento. Em relação a outros lubrificantes testados, como TRM1 e TRM2, observou-se que eles apresentaram viscosidade elevada, ultrapassando a máxima tensão cisalhante suportada pelo equipamento de medição.…”

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Modelagem do coeficiente de atrito em contatos lubrificados não-conformes.

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Gostaria de agradecer de todo coração à incrível professora Izabel Machado, minha orientadora e amiga. Com muita paciência, você sempre me guiou e auxiliou para que eu tivesse uma boa formação. Sua rigidez precisa foi um apoio fundamental nos momentos em que precisei, e você nunca me abandonou em momentos de desânimo, mesmo em uma pandemia. Os anos valiosos que passei na Universidade de São Paulo sob sua orientação foram marcados pelo seu cuidado e carinho constantes. A importância que você teve na minha vida é imensurável, e sou eternamente grato. Gostaria de agradecer também ao Francisco Profito, que conseguiu ensinar até mesmo a uma pessoa com um raciocínio limitado como eu. Obrigado pelos muitos ensinamentos, tentativas e pela amizade.Ao professor Amilton Sinatora, que me trouxe ao LFS e me introduziu ao mundo intrigante da tribologia.Ao professor Deniol Tanaka (in memoriam), que mostrou que cada aula, independentemente do tema, pode ser um espetáculo visual e de conhecimento. Ao professor Roberto Martins, pelo apoio logístico indispensável e arriscado com os lubrificantes deste trabalho. Obrigado por todo o aprendizado. Ao meu orientador professor Quaresma. Aos meus amigos Silene e Sidney (in memoriam), pelo acolhimento constante. Ao meu amigo paraense Paulo Machado, que me mostrou que correr em uma avenida segurando o escapamento de um fusca não é tão fácil quanto parece. Aos meus amigos lubrificados Juan Sebastian e Tiago Cousseau, que até em seus estudos de tribologia utilizaram o álcool como análise.Ao ex-abrasivo (com recaídas) Gustavo Tressia, meu amigo, quase amante.Ao meu amigo e chefe Jimmy Penagos, que estranhamente gostava de me dar carona de moto. Obrigado por proporcionar a melhor micrografia já vista pela humanidade.Ao Franco, meu amigo, que tem mais saúde que eu, mesmo sendo 40 anos mais velho.À linda e maravilhosa Vanessa Seriacopi, obrigado por todos os dias que passamos juntos, com risos, choros e ensinamentos. Você sempre será parte da minha vida. À Larissa Ihara, minha amiga, que compartilhou tantos momentos comigo e minha família.À minha amiga Renatinha, a melhor engenheira do Brasil. Muito obrigado.Ao poderoso amigo Guido, que além da amizade, proporcionou esta tese, disponibilizando seu precioso tempo europeu para me ajudar com os ensaios em London. Obrigado por tudo.Aos amigos colombianos Juan Ignácio e Pablo Correa, ex-vizinhos, amigos e parceiros.Ao meu amigo Roberto Oliveira, que mostrou que a mágica também acontece na tribologia, lubrificando cerâmica com água e criando um coeficiente de atrito mais baixo que meu saldo bancário.Ao meu amigo palmeirense Alexander Zuleta, obrigado pelas caronas noturnas.Ao meu irmão e grande amigo Raphael Oliveira, muito obrigado por tudo. Você foi um grande presente da vida.Ao meu amigo de matlab Pedrinho, que nossa amizade tenha resistência infinita aos ciclos da vida.Ao meu amigo mais rico, Newton Fukumasu, obrigado por conseguir modelar (com muitos elementos) uma amizade comigo.Meus amigos e parceiros de Raid, Arnaldo e Cassiano, obrigado por to...

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Lipophilic magnetite nanoparticles coated with stearic acid: A potential green and low cost way to improve thermal stability and tribological properties of fully formulated low viscosity engine oils

Cited by 8 publications

References 13 publications

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Tribo-Dependent Photoluminescent Behavior of Oleylamine-Modified AgInS2 and AgInS2-ZnS Nanoparticles as Lubricant Additives

Modelagem do coeficiente de atrito em contatos lubrificados não-conformes.

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