Micromachining Techniques for Fabrication of Micro and Nano Structures Part 12 docx

... 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 value for G * = 10 –10 for curve ... combinations, and therefore for a particular value of V = constant (horizontal line) it is possible to have different asperity base areas. For each combination of l...

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, ... “Atomic Force Microscope Studies of Lubricant Films on Solid Surfaces,” Vacuum 41, 128 3 128 6. Bowden, F. P. and Tabor, D. (1950), The Friction and Lubrication...

Ngày tải lên: 18/10/2013, 09:15

... Roughness (σ and P-V distance), Micro- and Macroscale Friction, Microscratching/Wear, and Nano- and Microhardness Data for Various Samples Surface Roughness nm (1 × 1 µm) Coefficient of friction Scratch ... Appl. Phys. 75, 5741–5746. With permission.) Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of Magnetic ” Handbook of Micro/ Nanotribology. Ed. Bharat Bhu...

Ngày tải lên: 18/10/2013, 09:15

... speed = 0.9–1.2 m/s; ambient air (RH 45 ± 5%). Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of MEMS ” Handbook of Micro/ Nanotribology. Ed. Bharat Bhushan Boca Raton: CRC Press LLC, ... review of macro- and micro/ nanotribological studies of single-crystal silicon and polysilicon, oxidized and implanted silicon, doped and undoped polysilicon films and SiC...

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 ... Maugis equation approaches those of JKRS theory, and the pull-off force goes to –1.5πRϖ. For the limit of λ equals zero, the system responds like the DMT mechanics, and the pull-o...

Ngày tải lên: 09/11/2013, 03:15

... Adhesion Forces • Force Laws • The Surface Force Apparatus and the Atomic Force Microscope 9.3 van der Waals and Electrostatic Forces between Surfaces in Liquids van der Waals Forces • ... Fluctuation Forces: Forces between Soft, Fluidlike Surfaces 9.6 Hydration Forces: Special Forces in Water and Aqueous Solutions Repulsive Hydration Forces • Attractive Hydrophobic Forces •...

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 ... approximations. 6.4.2 Deformation of Tip and Sample The deformation of tip and sample is fundamental to the adhesion and friction of any contact, including the special case...

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. ... Role of Micro/ Nanotribology in Magnetic Storage Devices, MEMS, and Other Microcomponents References In this chapter, we first present the history of macrotri...

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 ... 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 43...

Ngày tải lên: 27/01/2014, 14:20