SciCADE 2013
International Conference on Scientific Computation and Differential Equations
September 16-20, 2013, Valladolid (Spain)

Contributed Talk

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Molecular dynamics simulation of lubricant adsorption and depletion under heat treatment

B. Li and C.H. Wong

Abstract
Understanding the surface dynamics of thin oligomeric films under heat treatment is of fundamental importance in maintaining the stability and reliability of interfacial surfaces for micro- and nano-devices. In this work, the coarse-grained molecular dynamics simulation is employed to study the thermal adsorption and depletion instability of thin perfluoropolyether (PFPE) lubricant. The bead number density is examined to quantify the lubricant adsorption on the surface. The lubricant weight and bond losses are calculated to provide a real-time monitoring of lubricant depletion during rapid heating. Moreover, the depletion kinetics shows that lubricant desorption is favored over decomposition under heat treatment to high temperatures and is the major cause of lubricant degradation on the surface. Therefore, a novel PFPE lubricant suitable for heat assisted magnetic recording should be designed and engineered to overcome the prone to desorption for future hard disk drive applications.

Organized by         Universidad de Valladolid     IMUVA