Accession Number : ADA271864

Title :   Microscopic Modeling of Tribological and Interfacial Phenomena.

Descriptive Note : Final rept. 1 Jan 90-31 Jul 93,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF PHYSICS

Personal Author(s) : Landman, Uzi

Report Date : 31 JUL 1993

Pagination or Media Count : 108

Abstract : Atomic-scale energetics, structure and dynamical mechanisms underlying interfacial processes, in particular for systems when two materials are brought together, separated or slide against each other, are of fundamental importance for basic science and technology in areas such as interfaces, confined fluids, adhesion, tribology, junctions, lubrication, wear, surface modifications, and nano technology. Our research is focused on the development and implementation of methods of atomistic molecular dynamics simulations and applications to tribological, lubrication and related interfacial phenomena. The main research results include: (1) Simulations of the consequences of tip-substrate interactions, adhesive junction formation, nano-indentation, and force versus distance hysteresis. These investigations motivated experimental studies yielding results in agreement with the theoretical predictions. Furthermore, the results permit critical evaluation and extension of continuum treatments. (2) Investigations of structural and dynamical properties of confined model lubricants (alkanes); formation of liquid junctions, interfacial segregation In mixtures, atomistic mechanisms of cavitation and collapse and dependence of lubricant rheology on molecular architecture.

Descriptors :   *INTERFACES, *MODELS, *TRIBOLOGY, ADHESION, ADHESIVES, ALKANES, ARCHITECTURE, CAVITATION, COLLAPSE, DYNAMICS, FLUIDS, HYSTERESIS, INTERACTIONS, JUNCTIONS, LIQUIDS, LUBRICATION, MATERIALS, MIXTURES, MODIFICATION, PREDICTIONS, RHEOLOGY, SCALE, SIMULATION, SUBSTRATES, SURFACES, WEAR, ENERGETIC PROPERTIES, ATOMIC STRUCTURE, SLIDING, COMPOSITE MATERIALS.

Subject Categories : Mechanics
      Atomic and Molecular Physics and Spectroscopy
      Lubricants and Hydraulic Fluids
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE