title: Load-Induced Hydrodynamic Lubrication of Porous Films.
abstract: We present an exploratory study of the tribological properties and mechanisms of porous polymer surfaces under applied loads in aqueous media. We show how it is possible to change the lubrication regime from boundary lubrication to hydrodynamic lubrication even at relatively low shearing velocities by the addition of vertical pores to a compliant polymer. It is hypothesized that the compressed, pressurized liquid in the pores produces a repulsive hydrodynamic force as it extrudes from the pores. The presence of the fluid between two shearing surfaces results in low coefficients of friction (μ ≈ 0.31). The coefficient of friction is reduced further by using a boundary lubricant. The tribological properties are studied for a range of applied loads and shear velocities to demonstrate the potential applications of such materials in total joint replacement devices.
authors.affiliation: †Department of Chemical and Biomolecular Engineering, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118, United States.
authors.forename: Tushar
authors.initials: T
authors.lastname: Khosla
authors.affiliation: †Department of Chemical and Biomolecular Engineering, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118, United States.
authors.forename: Joseph
authors.initials: J
authors.lastname: Cremaldi
authors.affiliation: ‡Center for Bio/molecular Science and Engineering, Naval Research Lab, Washington, D.C. 20375, United States.
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Erickson
authors.affiliation: †Department of Chemical and Biomolecular Engineering, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118, United States.
authors.forename: Noshir S
authors.initials: NS
authors.lastname: Pesika
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry; D055119:Elastic Modulus; D057446:Hydrodynamics; D008153:Lubrication; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D004129:Dimethylpolysiloxanes; D011108:Polymers; D014867:Water; D012967:Sodium Dodecyl Sulfate; C013830:baysilon
keywords: aqueous lubricant; biomimetic; cartilage; friction; lubrication; surface structure