Looking through glass: Knowledge discovery from materials science literature using natural language processing Highlights d Natural language processing is used for information extraction from research papers d Caption cluster plots are used for exploring figure captions across the entire corpus d Elemental maps are used to identify the chemical elements reported in a study d A framework to extract domain-specific queries from the literature
Scratch-induced
surface damages in glasses can significantly reduce
the integrity of the glass components, leading to their eventual failure.
Here, it is shown that the interfacial friction and wear on glasses
during sliding in a liquid environment can be significantly reduced
using aqueous graphene oxide (GO) dispersion. To this extent, the
tribological generation of a GO-derived film from its aqueous dispersion
during reciprocating sliding of a spherical sapphire probe over fused
silica glass is demonstrated. The formation of dense GO tribofilm
on the scratch track is confirmed by micro-Raman spectroscopy and
atomic force microscopy analyses. Interestingly, the lubricious GO
tribofilm is observed to reduce the frictional forces by about 80%
compared to pure water. This reduced friction, in turn, limits the
shear-induced tensile stresses in the wake of sliding contact, thereby
minimizing the density of partial Hertzian cone cracks. Optical micrographs
confirm the clear differences in the crack density and severity of
sliding with and without the presence of the tribofilm. Furthermore,
the effect of frictional forces on the wear and cracking behavior
is established theoretically to supplement the understanding of friction’s
role in determining the surface damages occurring during scratching.
Overall, it is shown that the scratch resistance of glass surfaces
in aqueous conditions could be significantly enhanced through a hitherto
unknown tribofilm generation mechanism, thereby providing a fillip
toward increasing the service life of glasses.
Borosilicate glasses are used ubiquitously for a wide range of applications, where their mechanical properties play a critical role. However, the deformation mechanisms governing the sharp contact response of these glasses remain poorly understood. Herein, we analyze the role of elastoplastic response in determining the indentation deformation mechanisms for a range of borosilicate glass compositions. The series of glasses were made by varying the SiO2‐to‐B2O3 molar ratio while maintaining a constant content of network modifying alkali and alkaline earth oxides. We employed nanoindentation followed by annealing below the glass transition temperature to quantify the contribution of densification and shear flow as a function of glass composition. Interestingly, we observe that the volume recovery upon annealing is inversely proportional to the hardness of the glasses. This suggests that the resistance to permanent deformation is closely related to the network connectivity of the glasses, which in turn governs the mechanism of deformation under sharp contact loading. Overall, we show the important role of alkali and alkaline earth modifiers in governing the composition‐dependent indentation behavior of borosilicate glass series.
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