Summary
Boundary films are formed by physisorption, chemisorption, and chemical reaction. With physisorption, no exchange of electrons takes place between the molecules of the adsorbate and those of the adsorbant. The physisorption process typically involves van der Waals forces, which are relatively weak. In chemisorption, there is an actual sharing of electrons or electron interchange between the chemisorbed species and the solid surface. The solid surfaces bond very strongly to the adsorption species through covalent bonds. Chemically reacted films are formed by the chemical reaction of a solid surface with the environment. The physisorbed film can be either monomolecularly or polymolecularly thick. The chemisorbed films are monomolecular, but stoichiometric films formed by chemical reaction can have a large film thickness. In general, the stability and durability of surface films decrease in the following order: chemically reacted films, chemisorbed films, and physisorbed films. A good boundary lubricant should have a high degree of interaction between its molecules and the sliding surface. As a general rule, liquids are good lubricants when they are polar and, thus, able togrip solid surfaces (or be adsorbed). In this chapter, we focus on PFPEs. We first introduce details of the commonly used PFPE lubricants; then present a summary of nanodeformation, molecular conformation, and lubricant spreading studies; followed by an overview of nanotribological properties of polar and nonpolar PFPEs studied by atomic force microscopy (AFM) and some concluding remarks.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
B. Bhushan. Magnetic Recording Surfaces, pages 116–133. Butterworth-Heinemann, 1993.
B. Bhushan. Principles and Applications of Tribology. Wiley, 1999.
B. Bhushan. Introduction to Tribology. Wiley, 2002.
V. J. Novotny, I. Hussla, J. M. Turlet, and M. R. Philpott. Liquid polymer conformation on solid surfaces. J. Chem. Phys., 90:5861–5868, 1989.
V. J. Novotny. Migration of liquid polymers on solid surfaces. J. Chem. Phys., 92:3189–3196, 1990.
C. M. Mate and V. J. Novotny. Molecular conformation and disjoining pressures of polymeric liquid films. J. Chem. Phys., 94:8420–8427, 1991.
C. M. Mate. Application of disjoining and capillary pressure to liquid lubricant films in magnetic recording. J. Appl. Phys., 72:3084–3090, 1992.
G. G. Roberts. Langmuir—Blodgett Films. Plenum, 1990.
A. Ulman. An Introduction to Ultrathin Organic Films. Academic, 1991.
B. Bhushan. Tribology and Mechanics of Magnetic Storage Devices. Springer, 2nd edition, 1996.
B. Bhushan. Macro-and microtribology of magnetic storage devices, pages 1413–1513. CRC, 2001.
Anonymous. Fomblin z perfluoropolyethers, 2002.
B. Bhushan and Z. Zhao. Macroscale and microscale tribological studies of molecularly thick boundary layers of perfluoropolyether lubricants for magnetic thin-film rigid disks. J. Info. Storage Proc. Syst., 1:1–21, 1999.
B. Bhushan. Tribology Issues and Opportunities in MEMS. Kluwer, 1998.
B. Bhushan, J. N. Israelachvili, and U. Landman. Nanotribology: Friction, wear and lubrication at the atomic scale. Nature, 374:607–616, 1995.
B. Bhushan. Handbook of Micro/Nanotribology. CRC, 2nd edition, 1999.
B. Bhushan. Self-assembled monolayers for controlling hydrophobicity and/or friction and wear, pages 909–929. CRC, 2001.
J. Ruhe, G. Blackman, V. J. Novotny, T. Clarke, G. B. Street, and S. Kuan. Thermal attachment of perfluorinated polymers to solid surfaces. J. Appl. Polym. Sci., 53:825–836, 1994.
J. Ruhe, V. Novotny, T. Clarke, and G. B. Street. Ultrathin perfluoropolyether films — influence of anchoring and mobility of polymers on the tribological properties. ASME J. Tribol., 118:663–668, 1996.
V. N. Koinkar and B. Bhushan. Microtribological studies of unlubricated and lubricated surfaces using atomic force/friction force microscopy. J. Vac. Sci. Technol. A, 14:2378–2391, 1996.
H. Liu and B. Bhushan. Nanotribological characterization of molecularly-thick lubricant films for applications to mems/nems by afm. Ultramicroscopy, 97:321–340, 2003.
G. S. Blackman, C. M. Mate, and M. R. Philpott. Interaction forces of a sharp tungsten tip with molecular films on silicon surface. Phys. Rev. Lett., 65:2270–2273, 1990.
G. S. Blackman, C. M. Mate, and M. R. Philpott. Atomic force microscope studies of lubricant films on solid surfaces. Vacuum, 41:1283–1286, 1990.
C. A. Kim, H. J. Choi, R. N. Kono, and M. S. Jhon. Rheological characterization of perfluoropolyether lubricant. Polym. Prepr., 40:647–649, 1999.
M. Ruths and S. Granick. Rate-dependent adhesion between opposed perfluoropoly(alkylether) layers: Dependence on chain-end functionality and chain length. J. Phys. Chem. B, 102:6056–6063, 1998.
X. Ma, J. Gui, K. J. Grannen, L. A. Smoliar, B. Marchon, M. S. Jhon, and C. L. Bauer. Spreading of pfpe lubricants on carbon surfaces: Effect of hydrogen and nitrogen content. Tribol. Lett., 6:9–14, 1999.
U. Jonsson and B. Bhushan. Measurement of rheological properties of ultrathin lubricant films at very high shear rates and near-ambient pressure. J. Appl. Phys., 78:3107–3109, 1995.
C. Hahm and B. Bhushan. High shear rate viscosity measurement of perfluoropolyether lubricants for magnetic thin-film rigid disks. J. Appl. Phys., 81:5384–5386, 1997.
C. M. Mate. Atomic-force-microscope study of polymer lubricants on silicon surface. Phys. Rev. Lett., 68:3323–3326, 1992.
C. M. Mate. Nanotribology of lubricated and unlubricated carbon overcoats on magnetic disks studied by friction force microscopy. Surf. Coat. Technol., 62:373–379, 1993.
S. J. O’shea, M. E. Welland, and T. Rayment. Atomic force microscope study of boundary layer lubrication. Appl. Phys. Lett., 61:2240–2242, 1992.
S. J. O’shea, M. E. Welland, and J. B. Pethica. Atomic force microscopy of local compliance at solid—liquid interface. Chem. Phys. Lett., 223:336–340, 1994.
B. Bhushan, T. Miyamoto, and V. N. Koinkar. Microscopic friction between a sharp diamond tip and thin-film magnetic rigid disks by friction force microscopy. Adv. Info.Storage Syst., 6:151–161, 1995.
V. N. Koinkar and B. Bhushan. Micro/nanoscale studies of boundary layers of liquid lubricants for magnetic disks. J. Appl. Phys., 79:8071–8075, 1996.
B. Bhushan and S. Sundararajan. Micro/nanoscale friction and wear mechanisms of thin films using atomic force and friction force microscopy. ActaMater., 46:3793–3804, 1998.
B. Bhushan and C. Dandavate. Thin-film friction and adhesion studies using atomic force microscopy. J. Appl. Phys., 87:1201–1210, 2000.
S. Sundararajan and B. Bhushan. Static friction and surface roughness studies of surface micromachined electrostatic micromotors using an atomic force/friction force microscope. J. Vac. Sci. Technol. A, 19:1777–1785, 2001.
B. Bhushan and J. Ruan. Atomic-scale friction measurements using friction force microscopy: Part ii — application to magnetic media. ASME J. Tribol., 116:389–396, 1994.
T. Stifter, O. Marti, and B. Bhushan. Theoretical investigation of the distance dependence of capillary and van der waals forces in scanning probe microscopy. Phys. Rev. B, 62:13667–13673, 2000.
J. N. Israelachvili. Intermolecular and Surface Forces. Academic, 2nd edition, 1992.
S. K. Chilamakuri and B. Bhushan. A comprehensive kinetic meniscus model for prediction of long-term static friction. J. Appl. Phys., 15:4649–4656, 1999.
H. Ishigaki, I. Kawaguchi, M. Iwasa, and Y. Toibana. Friction and wear of hot pressed silicon nitride and other ceramics. ASME J. Tribol., 108:514–521, 1986.
T. E. Fischer. Tribochemistry. Annu. Rev. Mater. Sci., 18:303–323, 1988.
K. Mizuhara and S. M. Hsu. Tribochemical reaction of oxygen and water on silicon surfaces, pages 323–328. Elsevier, 1992.
S. Danyluk, M. McNallan, and D. S. Park. Friction and wear of silicon nitride exposed to moisture at high temperatures, pages 61–79. Dekker, 1994.
V. A. Muratov and T. E. Fischer. Tribochemical polishing. Annu. Rev. Mater. Sci., 30:27–51, 2000.
H. Yoshizawa, Y. L. Chen, and J. N. Israelachvili. Fundamental mechanisms of interfacial friction i: Relationship between adhesion and friction. J. Phys. Chem., 97:4128–4140, 1993.
H. Yoshizawa and J. N. Israelachvili. Fundamental mechanisms of interfacial friction ii: Stick slip friction of spherical and chain molecules. J. Phys. Chem., 97:11300–11313, 1993.
K. C. Eapen, S. T. Patton, and J. S. Zabinski. Lubrication of microelectromechanical systems (mems) using bound and mobile phase of fomblin z-dol. Tibol. Lett., 12:35–41, 2002.
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2005 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Bhushan, B., Liu, H. (2005). Nanoscale Boundary Lubrication Studies. In: Bhushan, B. (eds) Nanotribology and Nanomechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28248-3_19
Download citation
DOI: https://doi.org/10.1007/3-540-28248-3_19
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-24267-3
Online ISBN: 978-3-540-28248-8
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)