Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation
Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk. Due to temperature rise of PFPE Zdol lubricant molecules on...
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sg-ntu-dr.10356-1048742023-03-04T17:20:17Z Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation Deb Nath, S. K. Wong, C. H. School of Mechanical and Aerospace Engineering DRNTU::Engineering::Nanotechnology Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk. Due to temperature rise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached from lubricant molecules during coating is described considering the effect of temperatures on the bond/break density of PFPE Zdol using the coarse-grained bead spring model based on finitely extensible nonlinear elastic potential. As PFPE Z contains no polar end groups, effects of temperature on the bond/break density (number of broken bonds/total number of bonds) are not so significant like PFPE Zdol. Effects of temperature on the bond/break density of PFPE Z on DLC surface are also discussed with the help of graphical results. How bond/break phenomenonaffects the end bead density of PFPE Z and PFPE Zdol on DLC surface is discussed elaborately. How the overall bond length of PFPE Zdol increases with the increase of temperature which is responsible for its decomposition is discussed with the help of graphical results. At HAMR condition, as PFPE Z and PFPE Zdol are not suitable lubricant on a hard disk surface, it needs more investigations to obtain suitable lubricant. We study the effect of breaking of bonds of nonfunctional lubricant PFPE Z, functional lubricants such as PFPE Zdol and PFPE Ztetrao, and multidented functional lubricants such as ARJ-DS, ARJ-DD, and OHJ-DS on a DLC substrate with the increase of temperature when heating of all of the lubricants on a DLC substrate is carried out isothermally using the coarse-grained bead spring model by molecular dynamics simulations and suitable lubricant is selected which is suitable on a DLC substrate at high temperature. Published version 2014-08-15T09:00:18Z 2019-12-06T21:41:43Z 2014-08-15T09:00:18Z 2019-12-06T21:41:43Z 2014 2014 Journal Article Deb Nath, S. K., & Wong, C. H. (2014). Study of the Thermal Decomposition of PFPEs Lubricants on a Thin DLC Film Using Finitely Extensible Nonlinear Elastic Potential Based Molecular Dynamics Simulation. Journal of Nanotechnology, 2014, 390834-. 1687-9503 https://hdl.handle.net/10356/104874 http://hdl.handle.net/10220/20308 10.1155/2014/390834 en Journal of nanotechnology Copyright © 2014 S. K. Deb Nath and C. H. Wong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. application/pdf |
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DRNTU::Engineering::Nanotechnology Deb Nath, S. K. Wong, C. H. Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
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Perfluoropolyethers (PFPEs) are widely used as hard disk lubricants for protecting carbon overcoat reducing friction between the hard disk interface and the head during the movement of head during reading and writing data in the hard disk. Due to temperature rise of PFPE Zdol lubricant molecules on a DLC surface, how polar end groups are detached from lubricant molecules during coating is described considering the effect of temperatures on the bond/break density of PFPE Zdol using the coarse-grained bead spring model based on finitely extensible nonlinear elastic potential. As PFPE Z contains no polar end groups, effects of temperature on the bond/break density (number of broken bonds/total number of bonds) are not so significant like PFPE Zdol. Effects of temperature on the bond/break density of PFPE Z on DLC surface are also discussed with the help of graphical results. How bond/break phenomenonaffects the end bead density of PFPE Z and PFPE Zdol on DLC surface is discussed elaborately. How the overall bond length of PFPE Zdol increases with the increase of temperature which is responsible for its decomposition is discussed with the help of graphical results. At HAMR condition, as PFPE Z and PFPE Zdol are not suitable lubricant on a hard disk surface, it needs more investigations to obtain suitable lubricant. We study the effect of breaking of bonds of nonfunctional lubricant PFPE Z, functional lubricants such as PFPE Zdol and PFPE Ztetrao, and multidented functional lubricants such as ARJ-DS, ARJ-DD, and OHJ-DS on a DLC substrate with the increase of temperature when heating of all of the lubricants on a DLC substrate is carried out isothermally using the coarse-grained bead spring model by molecular dynamics simulations and suitable lubricant is selected which is suitable on a DLC substrate at high temperature. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Deb Nath, S. K. Wong, C. H. |
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Article |
author |
Deb Nath, S. K. Wong, C. H. |
author_sort |
Deb Nath, S. K. |
title |
Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
title_short |
Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
title_full |
Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
title_fullStr |
Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
title_full_unstemmed |
Study of the thermal decomposition of PFPEs lubricants on a thin DLC film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
title_sort |
study of the thermal decomposition of pfpes lubricants on a thin dlc film using finitely extensible nonlinear elastic potential based molecular dynamics simulation |
publishDate |
2014 |
url |
https://hdl.handle.net/10356/104874 http://hdl.handle.net/10220/20308 |
_version_ |
1759857817924141056 |