The wear kinetics of NaCl under dry nitrogen and at low humidities
Section snippets
Acknowledgements
The author acknowledge the fruitful discussions with Kathy Wahl and Lloyd Whitman, experimental assistance by Jennifer Sullivan, instrumental support from AFOSR, and financial support from ONR.
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Atomic-scale insights into the tribochemical wear of diamond on quartz surfaces
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2022, Applied Surface ScienceCitation Excerpt :Since there was no sliding involved in this mode of AFM, the contribution of normal stress alone could be studied. Investigations of atomic scale wear processes using AFM were also carried out on polymeric surfaces, NaCl step edges, and single crystal calcite edges to show that wear was a thermally activated, stress-assisted process [31–33]. However, AFM experiments cannot show how shear stress activates chemical species at an interface nor provide a complete description of the different contributions of normal and shear stress.
Stress-dependent adhesion and sliding-induced nanoscale wear of diamond-like carbon studied using in situ TEM nanoindentation
2022, CarbonCitation Excerpt :X-ray photoelectron spectroscopy (XPS) analysis was performed with a multi-purpose XPS (Sigma Probe, Thermo VG Scientific, X-ray Source: monochromatic Al Ká (1486.6 eV, 24.6W, 100 μm, 45°)). This exponential dependence of adhesion on applied stress, as seen with the present results and the prior Si-diamond results [40], is broadly consistent with stress-activated transition state theory [50,51] which has been applied to atomic-scale wear phenomena in multiple cases [41,52–56]. As suggested previously, applied stress lowers the activation barrier to breaking and forming bonds, leading to an exponential dependence on the interfacial bond formation and a corresponding increase in the adhesion force required to break those bonds when separating the surfaces.
The nature of atomic wear from molecular simulations
2022, Tribology InternationalNanoscale wear of hard materials: An overview
2020, Current Opinion in Colloid and Interface ScienceCitation Excerpt :Helt and Bateas [39] in AFM nanowear experiments using muscovite mica under aqueous environments, observed the formation of defects that led to atomic wear, once a certain threshold was overcome, confirming the nanowear mechanism proposed by Hu et al. [37]. In the following years upto the present, AFM nanowear experiments have been performed in a relatively large range of materials, such as thin films of AgBr and C60deposited on NaCl [40], NaCl [41], KBr [22,42,43], PZT's [44], polymeric magnetic tapes [45], silicon [46,47], SiO2 [47,48], mica [37,49], thin DLC (diamond-like carbon) coatings [20], thermoplastic and thermosetting polymers [50], among other materials, both in ultrahigh vacuum and environmental conditions. Fewer experiments have been performed with metals, maybe because, as pointed out by Gnecco et al. [42], metals are not the best candidates to study wear mechanisms by AFM because the debris tend to accumulate on the tip, leading to a small reproducibility of the measurements.