Synthesis and Application of Inorganic Nanoparticles as Lubricant Components – a Review

Bakunin, V. N.; Suslov, A. Yu.; Kuz’mina, G. N.; Parenago, O. P.; Topchiev, A. V.

doi:10.1023/b:nano.0000034720.79452.e3

Cited by 203 publications

(110 citation statements)

References 75 publications

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“…Inverse-emulsion based technique for the synthesis of inorganic particles is based on the assumption that the inner aqueous pool serves a confined micro-reactor for the production of desired particles [9]. Up to now, various kinds of particles have been successfully formed by using this technique including metal oxides and inorganic materials [2,7,10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of zinc borate by inverse emulsion technique for lubrication

Savrık

Balköse

Ülkü

2010

J Therm Anal Calorim

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Lubricating oil additives based on boron compounds are promising materials for lubrication due to their tribological advantages such as antiwear efficiency, good film strength, and high temperature resistance. This article deals with the preparation of zinc borate particles that are well dispersed and colloidally stabilized in mineral oil. This method starts with preparing two inverse emulsions (water-in-oil) with sorbitan monostearate (Span 60) as a surfactant, light neutral oil as a continuous phase, and the aqueous solutions of borax decahydrate (Na 2 B 4 O 7 Á10H 2 O) and zinc nitrate (Zn(NO 3 ) 2 Á6H 2 O) as the dispersed phases. The produced particles were zinc borate crystals having both rod-like and spherical morphologies, and the diameters of spherical particles were changing between 20 and 30 nm. FTIR spectra of the obtained particles showed the characteristic peaks of trihedral borate (B(3)-O) and tetrahedral borate (B(4)-O) groups as well as the specific peaks of the sorbitan monostearate. TG showed 30.42% and 22.08% mass loss at 600°C for the samples prepared by inverse emulsion and precipitation techniques, respectively. The endothermic peak at 50°C is observed due to the melting of sorbitan monostearate and the heat of melting is evaluated as -3.50 J/g. Tribological studies revealed that sorbitan monostearate not only outperformed as a dispersing agent of inorganic particles, but also it proved to be an anti-wear agent. Zinc borate produced by precipitation decreased the wear scar diameter from 1.402 to 0.639 mm and the friction coefficient from 0.099 to 0.064. The inverse emulsion was effective in decreasing wear scar diameter and the friction coefficient by lowering them to 0.596 and 0.089 mm, respectively.

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Section: Introductionmentioning

confidence: 99%

Synthesis of zinc borate by inverse emulsion technique for lubrication

Savrık

Balköse

Ülkü

2010

J Therm Anal Calorim

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“…The layered structure favours the easy cleavage along the planes, thus explaining also the lubricants properties. Indeed, being well investigated as lubricant [418], Figure 10. Schematic illustration for adsorption of cetylpyridinium chloride (CPC) on pyrite surface at different pH ranges.…”

Section: Molybdenum Sulphidementioning

confidence: 99%

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

2017

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Abstract:Metal sulphides, and in particular transition metal sulphide colloids, are a broad, versatile and exciting class of inorganic compounds which deserve growing interest and attention ascribable to the functional properties that many of them display. With respect to their oxide homologues, however, they are characterised by noticeably different chemical, structural and hence functional features. Their potential applications span several fields, and in many of the foreseen applications (e.g., in bioimaging and related fields), the achievement of stable colloidal suspensions of metal sulphides is highly desirable or either an unavoidable requirement to be met. To this aim, robust functionalisation strategies should be devised, which however are, with respect to metal or metal oxides colloids, much more challenging. This has to be ascribed, inter alia, also to the still limited knowledge of the sulphides surface chemistry, particularly when comparing it to the better established, though multifaceted, oxide surface chemistry. A ground-breaking endeavour in this field is hence the detailed understanding of the nature of the complex surface chemistry of transition metal sulphides, which ideally requires an integrated experimental and modelling approach. In this review, an overview of the state-of-the-art on the existing examples of functionalisation of transition metal sulphides is provided, also by focusing on selected case studies, exemplifying the manifold nature of this class of binary inorganic compounds.

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“…Therefore, permanent lubrication of combustion engines is required. Among different approaches to improve lubricants for tribological applications, metallic, e.g., Au, Bi, and Ni [1][2][3][4], and ceramic, e.g., CaCO 3 , CuO, and MOS x [5][6][7][8], nanoparticles were examined [9]. It was found that the magnitude of improvement significantly depends on nanoparticle material, size, shape, and mass concentration [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Although nanolubricants are frequently used for friction tests, little is known about stability and degree of dispersion of these nanoparticles in viscous liquids [6,[10][11][12]. Due to their high Gibbs energy, colloidal nanoparticles are thermodynamically unstable under ambient conditions [13].…”

Section: Introductionmentioning

confidence: 99%

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Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

2017

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Extended colloidal stability and high dispersion degree of nanolubricants are required to avoid nanoparticle deposition in combustion engines and to reduce friction and wear. The simple and rapid one-step technique of pulsed laser ablation in liquids is employed to synthesize precursor-free and highly dispersed gold nanoparticles in lubricants while the colloidal stability is measured by optical spectroscopy and transmission electron microscopy. A remarkable colloidal stability is determined under engine-like and ambient conditions for nine months in terms of constant primary particle size. In contrast to additive-free oils, almost no agglomeration is observed, which might be attributed to the attachment of engine oil additives or pyrolyzed/oxidized molecules to the nanoparticles preventing attractive nanoparticle interactions.

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Synthesis and Application of Inorganic Nanoparticles as Lubricant Components – a Review

Cited by 203 publications

References 75 publications

Synthesis of zinc borate by inverse emulsion technique for lubrication

Synthesis of zinc borate by inverse emulsion technique for lubrication

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

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