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

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 diam...

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Bibliographic Details
Published in:Materials 2018-09, Vol.11 (9), p.1783
Main Authors: Fernández-Coppel, Ignacio, Martín-Ramos, Pablo, Martín-Gil, Jesús, Pamies, Ramón, Avella, Manuel, Avilés, María
Format: Article
Language:English
Subjects:
Ammonium molybdate
Catalysis
Chemical synthesis
Coefficient of friction
Diffraction patterns
Dispersants
Dispersion
Electric contacts
Electron microscopy
Fourier transforms
Friction
Homogeneity
Hydrochloric acid
Linseed oil
Lubricants
Lubricants & lubrication
Lubrication
Magnetic properties
Metal forming
Molybdenum
Molybdenum oxides
Molybdenum trioxide
Nanoparticles
Oxidation
Photomicrographs
Rheology
Scanning electron microscopy
Spectrum analysis
Stainless steel
Sulfur
Surface layers
Transmission electron microscopy
Tribology
Viscosity
X ray reflection
X-ray diffraction
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma11091783