Micromachining Techniques for Fabrication of Micro and Nano Structures Part 7 docx
Handbook of Micro and Nano Tribology P4
... model. Figure 4.27a shows the plots of Vx, Vy, Kx, and Ky as a function of l for a magnetic tape, whereas Figure 4.27b shows the collapsed data of V(a) and K(a) as a function of asperity base ... evaluated for experimentally observed values of D = 1.38(Majumdar and Bhushan, 1990) and φ = 0.05 (Bhushan and Doerner, 1989) for disk type C, and anassumed value for G* = 10–10 for curve ... anymeaningful results for contact mechanics and size distribution.FIGURE 4. 27 Variation of surface height V and curvature K for the magnetic tape A surface. (a) V and K vs. l for two orthogonal...
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Handbook of Micro and Nano Tribology P8
... overview of lubrication studies of polar and nonpolar lubricants and Lang-muir–Blodgett and chemically grafted films, using atomic force/friction force microscopy. 8.2 Nanodeformation, Adhesive Forces, ... A 14, 2 378 –2391.Koinkar, V. N. and Bhushan, B. (1996b), Micro/ Nanoscale Studies of Boundary Layers of Liquid Lubri-cants for Magnetic Disks,” J. Appl. Phys. 79 , 8 071 –8 075 .Mate, C. ... single-grafted, LB, and Au films and is comparable with that of SiO 2 film. The C 18 double-grafted films can withstand much higher normal force of 40 µN as compared with200 nN for the case of LB films....
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Handbook of Micro and Nano Tribology P14
... Koinkar, V.N., 1994, J. Appl. Phys. 75 , 574 1– 574 6. With permission.)Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of Magnetic ” Handbook of Micro/ Nanotribology. Ed. Bharat Bhushan ... friction and adhesion forces area function of tip radius and relative humidity (also see Koinkar and Bhushan, 1996b). Therefore, relative FIGURE 14 .7 Schematic of local asperity deformation ... Introduction Micro/ nanotribological studies are needed to develop fundamental understanding of interfacial phenom-ena on a small scale and to study interfacial phenomena in micro- and nanostructures...
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Handbook of Micro and Nano Tribology P16
... review of macro- and micro/ nanotribological studies of single-crystal silicon and polysilicon, oxidized and implanted silicon, doped and undoped polysilicon films and SiC films. Asummary of limited ... Disks,” J. Appl. Phys. 79 , 8 071 –8 075 .Koinkar, V.N. and Bhushan, B. (1996b), “Microtribological Studies of Unlubricated and LubricatedSurfaces Using Atomic Force/Friction Force Microscopy,” J. Vac. ... Technol. A14, 2 378 –2391.Koinkar, V.N. and Bhushan, B. (19 97) , “Scanning and Transmission Electron Microscopies of Single-CrystalSilicon Microworn/Micromachined Using Atomic Force Microscopy,”...
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Handbook of Micro and Nano Tribology P5
... force upon separation of thetip and sample is often referred to as the pull-off force. Unfortunately, measuring the pull-off force doesnot directly give the work of adhesion. The pull-off force ... Bowden and Tabor (1950, 1964)understood the friction and wear of metal–metal sliding in terms of the plastic deformation of asperitycontacts.5.5.2 Outlook Part of the excitement in nanotribology ... Maugisequation approaches those of JKRS theory, and the pull-off force goes to –1.5πRϖ. For the limit of λequals zero, the system responds like the DMT mechanics, and the pull-off force approaches –2πRϖ.Measuring...
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Tài liệu Handbook of Micro and Nano Tribology P9 pptx
... Methods for Measuring Static and Dynamic Surface Forces Adhesion Forces • Force Laws • The Surface Force Apparatus and the Atomic Force Microscope 9.3 van der Waals and Electrostatic Forces ... (Marcelja and Radic, 1 976 ; Marcelja et al., 1 977 ; Gruen and Marcelja, 1983;Jönsson and Wennerström, 1983; Schiby and Ruckenstein, 1983; Luzar et al., 19 87; Attard and Batchelor,1988; Marcelja, 19 97) ... Fluctuation Forces: Forces between Soft, Fluidlike Surfaces9.6 Hydration Forces: Special Forces in Water and Aqueous Solutions Repulsive Hydration Forces • Attractive Hydrophobic Forces • Origin of...
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Tài liệu Colchero, J. et al. “Friction on an Atomic Scale”Handbook of Micro and Nano Tribology P6 Handbook of Micro/Nanotribology. Ed. Bharat ppt
... of holes. With higher forces, we observe that particles of hydrocarbons are pulled out and sheared out of the scanning area while the fluorocarbons remainundeformed. Control films of pure AA and ... variation of the resonance frequency of +2 Hz over the adatom sites and of –6 Hz overFIGURE 6.20 True atomic resolution image of the Si(111) 7 × 7 surface taken with dynamic force microscopy. ... approximations.6.4.2 Deformation of Tip and SampleThe deformation of tip and sample is fundamental to the adhesion and friction of any contact, includingthe special case of an SFM or SFFM setup....
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Tài liệu Handbook of Micro and Nano Tribology P10 pptx
... Micro/ Nanoscratch Technique10.6 Nanoindentation and Microscratch Techniques for Adhesion Measurements, Residual Stresses, and Materials Characterization of Thin Films Adhesion Strength and ... free-standingcantilever microbeams. Briefly, the technique involves the fabrication of the beams using silicon micro- machining techniques and the deflection of the beams using a nanoindenter. The nanoindenter ... thin film:(10. 17) FIGURE 10.30 Schematic of a cantilever microbeam deflected by nanoindenter loading mechanism for measure-ment of modulus of elasticity and yield strength of microbeam material....
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Tài liệu Handbook of Micro and Nano Tribology P1 ppt
... atomiclayers). These structures are generally lubricated with molecularly thin films. Micro- and nanotribological techniques are ideal for studying the friction and wear processes of micro- and nanostructures. ... normal spring constant of 0.0 07 N/m and torsional spring constant of 0 .72 N/m, which gives a lateral force sensitivity of 10 pN and an angle of resolution of 10 7 rad. With this particular geometry, ... measurement techniques used in micro/ nanotribologicalstudies, then present the examples of magnetic storage devices and microelectromechanical systems(MEMS) where micro/ nanotribological tools and techniques...
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Tài liệu Handbook of Micro and Nano Tribology P2 ppt
... cast thenormal force is simply the average of the forces in the forward and backward direction. The force formthe front, FFr, is the difference of the forces measured in forward and backward ... of the walls of thetube and calculating with the torus model, one gets for the angle(2. 87) where R is the radius of curvature the piezotube. Using the result of Equation 2. 87, one obtains for ... square pulse of width 12 between 310 and 356, a triangle of period 40 between 356 and 396,a triangle of period 20 between 400 and 420, a triangle of period 12 between 430 and 442, and, finally,...
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