By Seong H. Kim, Michael T. Dugger, Kash L. Mittal

Phenomena linked to the adhesion interplay of surfaces were a serious point of micro- and nanosystem improvement and function because the first MicroElectroMechanicalSystems(MEMS) have been fabricated. those phenomena are ubiquitous in nature and are found in all structures, in spite of the fact that MEMS units are rather delicate to their results as a result of their small measurement and constrained actuation strength that could be Read more...

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It should be noted that the r1 values shown here are just an estimate calculated from continuum models; the exact curvature or shape of the meniscus will be different especially when the meniscus height is only a few molecular layers tall. Figure 7(b) plots r2 as a function of p/psat for R varying from 10 nm to 100 nm. The cross-sectional radius (r2 ) shows a strong dependence on the tip radius (R). 99. 8. 95. D. B. Asay et al. / Adhesion Aspects in MEMS/NEMS (2010) 25–44 41 The individual components from the surface tension and the Laplace pressure as well as the total capillary force at point 1 are calculated using equation (22) and plotted as a function of p/psat for varying tip radii in Fig.

30. S. H. Kim, D. B. Asay and M. T. Dugger, Nano Today 2, 22 (2007). D. B. Asay, M. T. Dugger, J. A. Ohlhausen and S. H. Kim, Langmuir 24, 155 (2008). D. B. Asay, M. T. Dugger and S. H. Kim, Tribol. Lett. 29, 67 (2008). M. Binggeli and C. M. Mate, Appl. Phys. Lett. 65, 415 (1994). X. Xiao and L. Qian, Langmuir 16, 8153 (2000). R. Jones, H. M. Pollock, J. A. S. Cleaver and C. S. Hodges, Langmuir 18, 8045 (2002). M. He, A. S. Blum, D. E. Aston, C. Buenviaje and R. M. Overney, J. Chem. Phys. 114, 1355 (2001).

In this analysis, however, PLJa was calculated from the attractive forces of contacting asperities given by equation (16). In contrast to the prior method, attractive pressure from noncontacting asperities was taken into account in the mean height plane LJ pressure PLJ . If we denote asperity height by z, mean asperity height by zm , and asperity height distribution density function by φ(z − zm ) in the z-coordinate shown in Fig. 1, asperity elastic contact pressure Pela , asperity LJ pressure PLJa and real contact area ratio ARa are, respectively, given by ∞ 4 1/2 Pela = E ∗ ρRa 3 (z − d)3/2 φ(z) dz, (23) d ∞ PLJa = 2πRa γρ φ(z) dz, (24) d ∞ ARa = πRa ρ (z − d)φ(z) dz.

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