Synthesis and Exploration of the Lubricating Behavior of Nanoparticulated Mo15 S19 in Linseed Oil

Materials
Ignacio A Fernández-CoppelMaría Dolores Avilés

Abstract

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 coefficient...Continue Reading

References

Sep 30, 2006·Chemistry : a European Journal·Dialla SalloumPatrick Gougeon
Feb 9, 2008·Inorganic Chemistry·Hongtao YuStephanie L Brock
May 4, 2015·Journal of Colloid and Interface Science·Xiaoqiang Fan, Liping Wang
Jan 27, 2016·Proceedings of the National Academy of Sciences of the United States of America·Xuan DouJiaxing Huang
Mar 13, 2016·Analytical and Bioanalytical Chemistry·Signe VahurIvo Leito
Jun 7, 2015·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Ana M Díez-Pascual, Angel L Díez-Vicente

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Methods Mentioned

BETA
scanning
transmission
X-ray
transmission electron microscopy
profiler
electron diffraction
x-ray spectrometry

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