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| Title: | CHAIN LENGTH DEPENDENCE OF THE FRICTIONAL PROPERTIES OF N-ALKANE MONOLAYERS SELF-ASSEMBLED ON GOLD (111) | |
| DOI No: | 10.1142/9789812701947_0012 | |
| Source: | PHYSICS, CHEMISTRY AND APPLICATION OF NANOSTRUCTURES (pp 74-77) | |
| Author(s): | V. S. KULIK
Institute of Physics, National Academy of Sciences of Ukraine, 46 Prospect Nauki, UA-03028 Kiev, Ukraine A. A. MARCHENKO Institute of Physics, National Academy of Sciences of Ukraine, 46 Prospect Nauki, UA-03028 Kiev, Ukraine A. G. NAUMOVETS Institute of Physics, National Academy of Sciences of Ukraine, 46 Prospect Nauki, UA-03028 Kiev, Ukraine J. COUSTY CEA/DSM/DRECAM/SPCSI, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette Cedex, France |
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| Abstract: | Molecular structure and frictional properties of self-assembled monolayers formed at the interface between reconstructed Au(111) surfaces and liquid n-alkanes (CnH2n+2, n = 10, 12, 14, 16) have been studied by scanning tunneling microscopy and friction force technique. We show that under the regime of boundary lubrication, kinetic friction coefficient, μ, strongly depends on the length of the alkane molecule. With increasing CnH2n+2 chain length from n=10 (decane) up to n=16 (hexadecane), μ decreases from ~1.7 to ~0.35. The variation of μ is related to the dramatically lowered sliding force for the molecules with a length close to the coincidence period between the -CH2-CH2- chain (period ≈2.51 Å) and the atomic rows on Au(111) oriented along the <110> direction (period ≈2.88 Å). | |
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