Micromachining Techniques for Fabrication of Micro and Nano Structures Part 16 pptx
Handbook of Micro and Nano Tribology P4
... 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 ... combinations, and therefore for a particular value of V = constant (horizontal line) it is possible to have different asperitybase areas. For each combination of lxly, the effective curvature of an ... is increased from 1.1 to 1.9, the value of ac*= ac/Aadecreases from 10 16 to 10 16 , respectively, for the above values of G* and φ. Therefore, for D = 1.1, all thecontact spots are...
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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, ... LubricationStudies Using AtomicForce/Friction Force Microscopy Bharat Bhushan 8.1 Introduction8.2 Nanodeformation, Adhesive Forces, and Molecular Conformation8.3 Boundary Lubrication ... 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
... 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 modulationmodes. FIGURE 14.2 Schematics of the motion of the cantilever and tip as a result of the oscillations of ... 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
... 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 ... directmeasure 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 normal load and as a function of number of cycles ... TABLE 16. 2 rms, Microfriction, Microscratching/Microwear and Nanoindentation Hardness Data for Various Virgin, Coated, and Treated Silicon Samples Materialrms Roughness a (nm)Microscale...
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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
... 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 Surfaces9.6 Hydration Forces: Special Forces in Water and Aqueous Solutions Repulsive Hydration Forces • Attractive Hydrophobic Forces • Origin of ... Forces • Electrostatic Forces 9.4 Solvation and Structural Forces: Forces Due to Liquid and Surface Structure Effects of Surface Structure • Effect of Surface Curvature and Geometry 9.5...
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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 ... 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. ... helium-, and X-ray diffractionFIGURE 6.23 Topographic , (a) and (c), and friction (b) and (d), images of a double bilayer of Cd–arachidate. Scan size is2 × 2 µm2, the loading force is 4 nN for...
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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 ... 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. (From Weihs, ... Effect of relative yield strengths of the film and the substrate on the composite hardness for (a) asoft film on a hard substrate and (b) a hard film on a soft substrate. (From Bhattacharya, A.K. and...
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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. ... Role of Micro/ Nanotribology in Magnetic Storage Devices, MEMS, and Other MicrocomponentsReferencesIn this chapter, we first present the history of macrotribology and micro/ nanotribology and ... 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 ... 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, ... the other hand, forces of the order of 10 to 9 N destroy somebiological samples. 2.2 The Mechanics of Cantilevers 2.2.1. Compliance and Resonances of Lumped Mass Systems Any one of the building...
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