Micromachining Techniques for Fabrication of Micro and Nano Structures Part 7 docx

... model. Figure 4.27a shows the plots of V x , V y , K x , and K y 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 an assumed...

Ngày tải lên: 18/10/2013, 09:15

... 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....

Ngày tải lên: 18/10/2013, 09:15

... 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 are a function of tip radius and relative humidity (also see Koinkar and Bhushan, 1996b). Therefore, relative FIGURE 14 .7 Schematic of loc...

Ngày tải lên: 18/10/2013, 09:15

... 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. A summary of limited ... Disks,” J. Appl. Phys. 79 , 8 071 –8 075 . Koinkar, V.N. and Bhushan, B. (1996b), “Microtribological Studies of Unlubricated and Lubricated Surfaces Using Atomic Force/F...

Ngày tải lên: 25/10/2013, 12:15

... force upon separation of the tip and sample is often referred to as the pull-off force. Unfortunately, measuring the pull-off force does not 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 asperity contacts. 5.5.2 Outlook Part of the excit...

Ngày tải lên: 09/11/2013, 03:15

... 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 Batc...

Ngày tải lên: 17/12/2013, 11:15

... of holes. With higher forces, we observe that particles of hydrocarbons are pulled out and sheared out of the scanning area while the fluorocarbons remain undeformed. Control films of pure AA and ... variation of the resonance frequency of +2 Hz over the adatom sites and of –6 Hz over FIGURE 6.20 True atomic resolution image of the Si(111) 7 × 7 surface taken with dy...

Ngày tải lên: 25/12/2013, 23:18

... Micro/ Nanoscratch Technique 10.6 Nanoindentation and Microscratch Techniques for Adhesion Measurements, Residual Stresses, and Materials Characterization of Thin Films Adhesion Strength and ... free-standing cantilever microbeams. Briefly, the technique involves the fabrication of the beams using silicon micro- machining techniques and the deflection of the beams usi...

Ngày tải lên: 25/12/2013, 23:18

... atomic layers). 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 resolu...

Ngày tải lên: 23/01/2014, 04:20

... cast the normal force is simply the average of the forces in the forward and backward direction. The force form the front, F Fr , is the difference of the forces measured in forward and backward ... of the walls of the tube 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....

Ngày tải lên: 27/01/2014, 14:20