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Evaluation of nano-frictional and mechanical properties of a novel Langmuir–Blodgett monolayer/self-assembly monolayer composite structure

Published online by Cambridge University Press:  31 January 2011

Guang-hong Yang ,
Shu-xi Dai ,
Gang Cheng ,
Ping-yu Zhang  and
Zu-liang Du
Guang-hong Yang
Affiliation:
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, People’s Republic of China
Shu-xi Dai
Affiliation:
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, People’s Republic of China
Gang Cheng
Affiliation:
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, People’s Republic of China
Ping-yu Zhang*
Affiliation:
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, People’s Republic of China
Zu-liang Du*
Affiliation:
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475001, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: pingyu@henu.edu.cn
b)Address all correspondence to these authors. e-mail: zld@henu.edu.cn
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Abstract

A novel stearic acid (SA)/3-aminopropyltrethoxysilane (APS) composite structure was fabricated using the combined method of the Langmuir–Blodgett technique and self-assembly monolayer (SAM) technique. Its frictional, adhesive properties and interface contact types between the atomic force microscope tip and the samples were evaluated based on Amonton’s laws and the general Carpick’s transition equation, respectively. The results showed that the tip–sample contacts corresponded to the Johnson–Kendall–Robert/Derjaguin–Muller–Toporov (DMT) transition model for SiO2, APS-SAMs, and the unheated SA-APS composite structure, and for the heated SA-APS bilayer to the DMT model. Frictional forces for the four samples were linearly dependent on external loads at higher loads, and at lower loads they were significantly affected by adhesive forces. Frictional and scratching tests showed that the heated SA-APS composite structure exhibited the best lubricating properties and adhesion resistance ability, and its wear resistance capacity was greatly improved due to the binding-mode conversion from hydrogen bonds to covalent bonds. Thus, this kind of composite bilayer might be promising for applications in the lubrication of nano/microelectromechanical systems.

Keywords

AdhesionMicroelectro-mechanical (MEMS)Self-assembly
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2429 - 2436
Copyright
Copyright © Materials Research Society 2007

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