Frictional dynamics of fluorine-terminated alkanethiol self-assembled monolayers

Langmuir : the ACS Journal of Surfaces and Colloids
Byeongwon ParkOleg A Borodin

Abstract

The frictional dynamics of fluorine-terminated alkanethiol (S(CH2)8CF3) self-assembled monolayers (SAMs) on gold are studied using molecular dynamics simulations. The simulations treat the interactions between two SAMs on flat surfaces. The structure and frictional behavior are investigated as a function of applied pressure (200 MPa to 1 GPa) for a shear velocity of 2 m/s and compared to methyl-terminated alkanethiol SAMs. The maximum adhesive pressure between the SAMs is 220 MPa for both end groups. In agreement with experiments on the molecular scale, the shear stress and the coefficient of friction for CF3-terminated alkanethiols are larger than for CH3-terminated alkanethiols. The main source for the difference is primarily the tighter packing of the fluorinated terminal group resulting in a higher degree of order. The molecular scale coefficient of friction is correlated with the degree of order among all the systems.

References

Jun 20, 1996·Chemical Reviews·Abraham Ulman
Jul 18, 2002·Accounts of Chemical Research·Jack E Houston, Hyun I Kim

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Citations

Mar 30, 2011·The Journal of Physical Chemistry. a·Nitya Nand GosvamiRoland Bennewitz
Feb 18, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew Z SummersClare McCabe
Apr 16, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S EderG Betz
Dec 14, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Sidharam P PujariHan Zuilhof
Feb 18, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Leyla Ramin, Ahmad Jabbarzadeh
Feb 28, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jana E BlackClare McCabe
Oct 30, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Stefan J EderGerhard Betz

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