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Friction 2022, 10(2): 282-295 https://doi.org/10.1007/s40544-021-0490-8
Research Article | Open Access | Issue | Published: 10 April 2021

Mechanical properties of graphene oxide-silk fibroin bionanofilms via nanoindentation experiments and finite element analysis

Show Author's Information Hyeonho CHO1,†,  Joonho LEE2,4,†,  Hyundo HWANG3,  Woonbong HWANG3,  Jin-Gyun KIM2( ),  Sunghan KIM1( )
School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
Department of Mechanical Engineering (Integrated Engineering), Kyung Hee University, Gyeonggi 17104, Republic of Korea
Department of Mechanical Engineering, POSTECH, Pohang 37673, Republic of Korea
Department of Robotics & Mechatronics, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea

† Hyeonho CHO and Joonho LEE contributed equally to this work.

Keywords:
nanoindentation, graphene oxide, finite element analysis (FEA), silk fibroin, layer-by-layer (LbL)
Cite this article:
CHO H, LEE J, HWANG H, et al. Mechanical properties of graphene oxide-silk fibroin bionanofilms via nanoindentation experiments and finite element analysis. Friction, 2022, 10(2): 282-295. https://doi.org/10.1007/s40544-021-0490-8
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Abstract Full text About this article

Understanding the mechanical properties of bionanofilms is important in terms of identifying their durability. The primary focus of this study is to examine the effect of water vapor annealed silk fibroin on the indentation modulus and hardness of graphene oxide-silk fibroin (GO-SF) bionanofilms through nanoindentation experiments and finite element analysis (FEA). The GO-SF bionanofilms were fabricated using the layer-by-layer technique. The water vapor annealing process was employed to enhance the interfacial properties between the GO and SF layers, and the mechanical properties of the GO-SF bionanofilms were found to be affected by this process. By employing water vapor annealing, the indentation modulus and hardness of the GO-SF bionanofilms can be improved. Furthermore, the FEA models of the GO-SF bionanofilms were developed to simulate the details of the mechanical behaviors of the GO-SF bionanofilms. The difference in the stress and strain distribution inside the GO-SF bionanofilms before and after annealing was analyzed. In addition, the load-displacement curves that were obtained by the developed FEA model conformed well with the results from the nanoindentation tests. In summary, this study presents the mechanism of improving the indentation modulus and hardness of the GO-SF bionanofilms through the water vapor annealing process, which is established with the FEA simulation models.


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About this article

Mechanical properties of graphene oxide-silk fibroin bionanofilms via nanoindentation experiments and finite element analysis

Show Author's information Hyeonho CHO1,†, Joonho LEE2,4,†, Hyundo HWANG3, Woonbong HWANG3, Jin-Gyun KIM2( ), Sunghan KIM1( )
School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
Department of Mechanical Engineering (Integrated Engineering), Kyung Hee University, Gyeonggi 17104, Republic of Korea
Department of Mechanical Engineering, POSTECH, Pohang 37673, Republic of Korea
Department of Robotics & Mechatronics, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea

† Hyeonho CHO and Joonho LEE contributed equally to this work.

Abstract

Understanding the mechanical properties of bionanofilms is important in terms of identifying their durability. The primary focus of this study is to examine the effect of water vapor annealed silk fibroin on the indentation modulus and hardness of graphene oxide-silk fibroin (GO-SF) bionanofilms through nanoindentation experiments and finite element analysis (FEA). The GO-SF bionanofilms were fabricated using the layer-by-layer technique. The water vapor annealing process was employed to enhance the interfacial properties between the GO and SF layers, and the mechanical properties of the GO-SF bionanofilms were found to be affected by this process. By employing water vapor annealing, the indentation modulus and hardness of the GO-SF bionanofilms can be improved. Furthermore, the FEA models of the GO-SF bionanofilms were developed to simulate the details of the mechanical behaviors of the GO-SF bionanofilms. The difference in the stress and strain distribution inside the GO-SF bionanofilms before and after annealing was analyzed. In addition, the load-displacement curves that were obtained by the developed FEA model conformed well with the results from the nanoindentation tests. In summary, this study presents the mechanism of improving the indentation modulus and hardness of the GO-SF bionanofilms through the water vapor annealing process, which is established with the FEA simulation models.

Keywords: nanoindentation, graphene oxide, finite element analysis (FEA), silk fibroin, layer-by-layer (LbL)

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Received: 17 September 2020
Revised: 25 December 2020
Accepted: 11 January 2021
Published: 10 April 2021
Issue date: February 2022

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© The author(s) 2021

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant that was funded by the Korea Government (MSIT) (No. NRF- 2018R1C1B6002339).

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