Micromachining Techniques for Fabrication of Micro and Nano Structures Part 4 pot

... Surfaces 4. 4 Size Distribution of Contact Spots Observations of Size Distribution for Fractal Surfaces • Derivation of Size Distribution for Any Surface 4. 5 Contact Mechanics of Rough Surfaces ... parameters and allows the smallest spot area to tend to zero with their number tending to infinity. 4. 4.2 Derivation of Size Distribution for Any Surface The power law b...

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, ... 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 compa...

Ngày tải lên: 18/10/2013, 09:15

... B. and Koinkar, V.N., 19 94, J. Appl. Phys. 75, 5 741 –5 746 . With permission.) Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of Magnetic ” Handbook of Micro/ Nanotribology. Ed. Bharat ... Roughness 14. 4 Friction and Adhesion Nanoscale Friction • Microscale Friction and Adhesion 14. 5 Scratching and Wear Nanoscale Wear • Microscale Scratching • Microsc...

Ngày tải lên: 18/10/2013, 09:15

... Si(111) 0.20 0.22 0.20 0.20 0.28 0.22 0.26 0.16 ~2,200 ~5,500 ~1,200 ~3,000 >50,000 >50,000 >50,000 ~1,000 0.78 0 .45 0 .40 0 .40 0.23–0.28 0.20 0.26–0 .40 0.60 Normal load = 0.5 N; sliding speed = 0.9–1.2 m/s; ambient air (RH 45 ± 5%). Bhushan, B. Micro/ Nanotribology and Micro/ Nanomechanics of MEMS ” Handbook ... Lovell, E., and Choi, B. (1992), “Diagnostic Microstruc...

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

... 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 ... der Waals Forces • Electrostatic Forces 9 .4 Solvation and Structural Forces: Forces Due to Liquid and Surface Structure Effects of Surface Structure • Effect of Surface Cur...

Ngày tải lên: 17/12/2013, 11:15

... 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 of an SFM or SFFM ... images of a monolayer of a 1:1 mixture of PFCEA and AA; the scan size is 2 .4 × 2 .4 µm 2 . The topographic image (a) shows the circular islands of AA which are also seen...

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. ... constant of ~100 N/m. Ruan and Bhushan (1994a) and Bhushan and Ruan (1994a) used 115-µm-long, wide-legged V-shaped canti- levers made of Si 3 N 4 for f...

Ngày tải lên: 23/01/2014, 04:20

... 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 directions. 2.8 Scanning and Control ... with period 4 (286 to 310), a single square pulse of width 12 between 310 and 356, a triangle of period 40 between 356 and 396, a triangle of period 20 between 40 0 and...

Ngày tải lên: 27/01/2014, 14:20