Investigation of humidity-dependent nanotribology behaviors of Si(1 0 0)/SiO2 pair moving from stick to slip

Effect of surface roughness on sliding friction of micron-sized glass beads

“…Two aspects of these results are somewhat surprising: (i) Etched Si surfaces show a significantly increased friction coefficient compared to the as received Si surface and (ii) L adh does not agree with the measured AFM based adhesion forces, see Table 3. However, the resulting friction coefficient of the as received Si(100) wafer in contact with the spherical probe of 0.23 ± 0.05 is in good agreement with the work of Yu et al [12], who probed the transition from stick to slip for the contact of micron-sized silica spheres on a Si(100) wafer depending on the relative humidity, as well as findings by Zhang et al [21], who studied the sliding friction of silica colloidal probes on microsphere-patterned silicon surfaces. Further agreement is found with reports by Maharaj et al [22] and Quintanilla et al [23].…”

“…[12], the sliding experiments on the Si surface etched at 1,600 W were repeated under a dry (2.4% RH) nitrogen atmosphere. The comparison between the previous results and the once under dry condition are shown in Fig.…”

“…Aside from a potentially strong adhesive contribution [10], in all cases Amontons´ law is valid. However, a variation in friction coefficient can be measured and several models [11,12] have been developed to correlate this variation with the corresponding variation in surface roughness. The most prominent theories have been proposed by Bowden 256 Friction 2(3): 255-263 (2014) and Tabor [11] and Greenwood et al [13,14] who suggested that the real contact area increased with applied load due to surface roughness.…”

Effect of coadsorption of water and alcohol vapor on the nanowear of silicon

“…When the contact pair is chemically inert (such as diamond tip), the mechanical wear of silicon surface usually occurs under high contact pressure [11,12]. However, when the contact pair is chemically reactive (such as Si or SiO 2 tip), serious tribochemical wear of silicon may occur in humid air under a contact pressure far below its yield stress (7 GPa) [13][14][15]. Such tribochemical wear was also observed in silicon-based MEMS devices [7][8][9][10].…”

Quantitative investigation on single-asperity friction and wear of phosphate laser glass against a spherical AFM diamond tip

“…The AFM tips can be used to simulate a single asperity contact and can provide a very light normal load at micro-Newton scale during friction, which is a necessary condition for the ductile material removal at nanoscale [9][10][11][12]. Through contact, the AFM tip can perform single-pass line scanning and multi-pass line scanning.…”