Micromachining Techniques for Fabrication of Micro and Nano Structures Part 16 pptx

... 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, ... Lubrication Studies Using Atomic Force/Friction Force Microscopy Bharat Bhushan 8.1 Introduction 8.2 Nanodeformation, Adhesive Forces, and Molecular Conformation 8.3 Bo...

Ngày tải lên: 18/10/2013, 09:15

... Appl. Phys. 75, 5741–5746. With permission.) Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of Magnetic ” Handbook of Micro/ Nanotribology. Ed. Bharat Bhushan Boca Raton: CRC Press ... Schematic of the bimorph assembly used in AFM for operation in tapping and force modulation modes. FIGURE 14.2 Schematics of the motion of the cantilever and tip as a res...

Ngày tải lên: 18/10/2013, 09:15

... Apparatus and Test Procedures • Test Samples 16. 3 Results and Discussion Micro/ Nanotribological Studies of Virgin, Coated, and Treated Silicon Samples • Micro/ Nanotribological Studies of Doped and ... direct measure of wear in the motor bearing. FIGURE 16. 16 (a) Scratch depths for 10 cycles as a function of normal load and (b) wear depths as a function of norm...

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

... 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 ... 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 mic...

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 430 a...

Ngày tải lên: 27/01/2014, 14:20