Effect of load on structural and frictional properties of alkanethiol self-assembled monolayers on gold: some odd-even effects

Langmuir : the ACS Journal of Surfaces and Colloids
Leyla Ramin, Ahmad Jabbarzadeh

Abstract

We have conducted molecular dynamics simulations to study the frictional properties of alkanethiols CH(3)(CH(2))(n-1)SH (Cn, 12 ≤ n ≤ 15) self-assembled monolayers (SAMs) on Au(111) surfaces, under various loading and shearing conditions. For the examined alkanethiols, we found some evidence of the friction coefficient being dependent on the number of carbon atoms in the molecule being odd or even. Alkanethiols with n = odd show consistently higher friction coefficients than those with n = even. Such odd-even effect seems to be independent of the sliding velocity. However, the effect is significant only at lower loads (<700 MPa). The structural origin of this odd-even effect has been discussed. The effect of loading on the structure is also studied. For dodecanethiol (n = 12) we find the film responds to increased loading initially by increasing the tilt and then by deformation of individual molecules. SAM-Au contacts under shear show periodic storage and release of energy and a clear stick-slip pattern in the shear stress, film thickness, and the tilt and tilt orientation angles.

References

Jun 20, 1996·Chemical Reviews·Abraham Ulman
Jul 18, 2002·Accounts of Chemical Research·Jack E Houston, Hyun I Kim
Nov 3, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Byeongwon ParkOleg A Borodin
Nov 5, 2004·Physical Review Letters·M ChandrossS H Garofalini
Dec 14, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Piyush SrivastavaPaul E Laibinis
Dec 14, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Paul T MikulskiJudith A Harrison
Jun 29, 2006·Physical Review Letters·A JabbarzadehR I Tanner
Mar 29, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·M VouéJ De Coninck
Apr 19, 2007·Chemical Reviews·Feng Tao, Steven L Bernasek
Feb 27, 2009·Nature·Yifei MoIzabela Szlufarska
Jul 14, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Leyla Ramin, Ahmad Jabbarzadeh

❮ Previous
Next ❯

Citations

Aug 13, 2013·Physical Chemistry Chemical Physics : PCCP·Chui-Peng KongHong-Xing Zhang
Nov 14, 2012·The Journal of Chemical Physics·Leyla Ramin, Ahmad Jabbarzadeh
Dec 4, 2012·Journal of Colloid and Interface Science·Masayo OgisoNorihiko Minoura
Apr 16, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Hubert GojzewskiArkadiusz Ptak
Sep 20, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Zhengjia WangMartin Thuo
Dec 31, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Anton IakovlevMarcus Müller
Dec 18, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Chiara GattinoniDaniele Dini
Oct 3, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Leyla Ramin, Ahmad Jabbarzadeh
Aug 5, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Jiahao ChenMartin M Thuo
Aug 26, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Martha E GradyNancy R Sottos
Oct 3, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Hubert GojzewskiArkadiusz Ptak
Aug 26, 2014·The Journal of Physical Chemistry. B·Andrew J ChristoffersonIrene Yarovsky
Nov 8, 2014·Journal of the American Chemical Society·Mostafa BaghbanzadehGeorge M Whitesides

❮ Previous
Next ❯

Related Concepts

Related Feeds

Antifungals

An antifungal, also known as an antimycotic medication, is a pharmaceutical fungicide or fungistatic used to treat and prevent mycosis such as athlete's foot, ringworm, candidiasis, cryptococcal meningitis, and others. Discover the latest research on antifungals here.

Antifungals (ASM)

An antifungal, also known as an antimycotic medication, is a pharmaceutical fungicide or fungistatic used to treat and prevent mycosis such as athlete's foot, ringworm, candidiasis, cryptococcal meningitis, and others. Discover the latest research on antifungals here.