Odd-Even Effects in the Friction of Self-Assembled Monolayers of Phenyl-Terminated Alkanethiols in Contacts of Different Adhesion Strengths

被引：21

作者：

Yang, Yutao ^{[1
]}

Jamison, Andrew C. ^{[2
]}

Barriet, David ^{[2
]}

Lee, T. Randall ^{[2
]}

Ruths, Marina ^{[1
]}

机构：

[1] Univ Massachusetts, Dept Chem, Lowell, MA 01854 USA

[2] Univ Houston, Dept Chem, Houston, TX 77204 USA

来源：

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY | 2010年 / 24卷 / 15-16期

关键词：

Phenyl-terminated alkanethiols; self-assembled monolayers (SAMs); friction; adhesion; odd-even; atomic force microscopy (AFM); Thin-Coating Contact Mechanics (TCCM) model; ATOMIC-FORCE MICROSCOPY; ALKYL CHAIN-LENGTH; BOUNDARY FRICTION; THIOL MONOLAYERS; SILVER SURFACES; MOLECULAR-LEVEL; N-ALKANETHIOLS; AMONTONS LAW; GOLD; AU(111);

D O I：

10.1163/016942410X508253

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

We have studied the frictional properties of self-assembled monolayers (SAMs) of phenyl-terminated alkanethiols, C6H5(CH2)(n)SH (n = 13-16) on template-stripped gold. The friction force was measured with atomic force microscopy (AFM), and the magnitude of the adhesion was controlled by immersing the sliding contact in ethanol (giving low adhesion) or dry N-2 gas (giving enhanced adhesion relative to ethanol). We observed a linear friction force as a function of load (F = mu L) in the systems with low adhesion and a non-linear friction force when the adhesion was higher. The non-linear behavior in the adhesive systems appeared to be area-dependent (F = S(c)A) and was compared to contact areas calculated using the extended Thin-Coating Contact Mechanics (TCCM) model. In ethanol, the coefficient of friction mu was found to be systematically higher for odd values of n (i.e., for the monolayers in which the terminal phenyl group was oriented closer to the surface normal). (C) Koninklijke Brill NV, Leiden, 2010

引用

页码：2511 / 2529

页数：19

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