US EPA

3860651 

Journal Article 

Atomistic and Molecular Effects on the Surface Morphology and Film Conformation of Perfluoropolyether Lubricant Layer 

Chung, PilS; Park, S; Vemuri, SH; Jhon, MS 

2015 

Yes 

I E E E Transactions on Magnetics
ISSN: 0018-9464 

51 

11 

10.1109/TMAG.2015.2436895 

WOS:000364770500289 

In this paper, we analyzed atomistic and molecular architectural effects on the film microstructure and morphological properties for the monolayer perfluoropolyether (PFPE) lubricant film by investigating PFPEs with different molecular structures and functionalities (Zdol, Ztetraol, Ztetraol multidentate, and TA-30) via large-scale coarse-grained bead-spring molecular dynamics originating from the atomistic theory. Film surface morphology was examined by average height and root mean square roughness, and the internal clusters of functional groups on the surface were characterized by the radial distribution function of functional groups, followed by the quantitative estimation of adhesion ratio and coordination number. We also illustrate the effects of molecular structure on the film conformation, which is useful to molecular design criteria for the head-disk interface. 

Film conformation; head-disk interface (HDI); lubricant film; molecular dynamics (MD); perfluoropolyether (PFPE)