The Static and Dynamic Responses of Binary Mixture Perfluoropolyether Lubricant Films- Molecular Structural Effects

Static and dynamic properties of single-component perfluoropolyether (PFPE) lubricants have been studied for optimal lubricant selection by examining the molecular conformations that influence the thickness and the mobility for the self-healing capability in lubricant nanofilms. In this paper, we ex...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.3644-3647
Main Authors: Pil Seung Chung, Hakhee Park, Jhon, M.S.
Format: Article
Language:English
Subjects:
Bead-spring model
binary mixtures
Chemical engineering
Computer simulation
Cross-disciplinary physics: materials science
rheology
Data engineering
Data storage systems
diffusion coefficient
Disk drives
Dynamics
Exact sciences and technology
Extraterrestrial phenomena
head-disk interface
Knowledge engineering
Lubricants
Lubricants & lubrication
Magnetism
Maintenance
Materials science
Materials science and technology
Mathematical models
molecular dynamics
Molecular structure
Nanocomposites
Nanomaterials
Nanostructure
Other topics in materials science
perfluoropolyethers
Physics
Polymers
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Summary:Static and dynamic properties of single-component perfluoropolyether (PFPE) lubricants have been studied for optimal lubricant selection by examining the molecular conformations that influence the thickness and the mobility for the self-healing capability in lubricant nanofilms. In this paper, we examine the physiochemical properties of the mixture of these two PFPEs using molecular dynamics (MD) simulations to find an optimal blend ratio to meet the stringent requirements for disk lubricants of ultra-low head media spacing (HMS). A coarse-grained, bead-spring model was used to model the polymer nanoblends using functional and nonfunctional PFPEs. We examined the static and dynamic responses of binary PFPE films as a function of the molecular structures including end-group functionality. The effect of the functional end-group on the static structures was examined by simulating the parallel and perpendicular components of the radius of gyration. The dynamic responses of various PFPE nanoblends were also simulated by explicitly calculating the self-diffusion coefficient of a tagged molecule. Polydispersity effect on nanoblends was also examined.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2022841