Real Time TEM Imaging of Compression and Shear of Single Fullerene-Like MoS2 Nanoparticle

Abstract

The deformation and degradation behavior of single inorganic fullerenes nanoparticles of MoS 2 under compression and shear has been observed in real time using a high-resolution transmission electron microscope equipped with a nanoindentation holder. The MoS 2 nanoparticles were compressed using a nanoindenter and a truncated diamond tip. For the first time, real time imaging of the deformation of individual nanoparticles clearly shows first orientation changes in the particle shape during loading process followed by a large deformation and the exfoliation of the outer sheets of the fullerene nested structure. Exfoliation was observed for a contact pressure estimated at 1 GPa. Additional sliding tests performed with the nanoindenter gave evidence for a rolling process for lower contact pressures up to 100 MPa.

Evaluation of Anti-Wear Properties of Metalworking Fluids Enhanced with Halloysite Nanotubes

“…As explained by Lecouvet et al [34], HNTs are hard aluminosilicates with interlayer water molecules where weak Van der Waals forces and H-bonds are present, and shearing occurs due to the slip motion between these layers, particularly for larger nanoparticle diameters (>120 nm). A similar behavior has also been reported experimentally by Lahouij et al [35] for inorganic fullerene-like (IF)-MoS 2 nanoparticles. At contact pressures of 1 GPa exfoliation of outer fullerene sheets was found to be the predominant mechanism, and at lower pressures (0.1 GPa) a rolling/sliding mechanism was observed.…”

IF-MoS2 based lubricants: Influence of size, shape and crystal structure

“…Due to their good mechanical resistance they do not deform easily under the effect of the gradual increase of the pressure near the contact zone. Recently some authors [19,20] investigated in real time the deformation and degradation behaviour of the same ''well crystallised'' IF-MoS 2 nanoparticles under compression and shear stress using a high-resolution transmission electron microscope equipped with a nanoindentation holder. The authors showed that the ability of the particle to exfoliate was strongly dependent on their physical properties.…”

Formation of an adsorption film of MoS2 nanoparticles and dioctyl sebacate on a steel surface for alleviating friction and wear

“…With advanced chemical techniques, MoS 2 with these novel morphologies has been synthesized [14][15][16][17][18]. The applications of spherical IF-MoS 2 [19][20][21][22] and MoS 2 nanotubes [23][24][25][26] also enrich the lubricating mechanisms of solid lubricants.…”