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

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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.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant Nos. 90306010, 20371015, 20571024) and the Program for New Century Excellent Talents in University.

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Authors and Affiliations

  1. Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475001, People’s Republic of China

    Guang-hong Yang, Shu-xi Dai, Gang Cheng, Ping-yu Zhang & Zu-liang Du

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  1. Guang-hong Yang
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  2. Shu-xi Dai
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  3. Gang Cheng
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  4. Ping-yu Zhang
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  5. Zu-liang Du
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Correspondence to Ping-yu Zhang or Zu-liang Du.

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Yang, Gh., Dai, Sx., Cheng, G. et al. Evaluation of nano-frictional and mechanical properties of a novel Langmuir–Blodgett monolayer/self-assembly monolayer composite structure. Journal of Materials Research 22, 2429–2436 (2007). https://doi.org/10.1557/jmr.2007.0332

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  • DOI: https://doi.org/10.1557/jmr.2007.0332

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