Creep Behavior of Graphene Oxide, Silk Fibroin, and Cellulose Nanocrystal Bionanofilms
- Authors
- Shakil, A.; Kim, S.; Polycarpou, A.A.
- Issue Date
- Jun-2022
- Publisher
- John Wiley and Sons Inc
- Keywords
- creep; finite element analysis; graphene nanoindentation; thin films
- Citation
- Advanced Materials Interfaces, v.9, no.18
- Journal Title
- Advanced Materials Interfaces
- Volume
- 9
- Number
- 18
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/54947
- DOI
- 10.1002/admi.202101640
- ISSN
- 2196-7350
2196-7350
- Abstract
- Graphene oxide (GO), silk fibroin (SF), and cellulose nanocrystal (CNC) nanocomposite is a novel biomaterial with superior mechanical properties. Elevated temperature nanoindentation experiments using constant load hold method are performed to investigate temperature-dependent mechanical and creep behavior of the GO–SF–CNC nanocomposite. Hardness and reduced modulus of GO–SF–CNC are determined from experiments at 25, 40, 60, 80, and 100 °C, and yield strength and creep coefficients are predicted from finite element analysis using two-layer viscoplasticity theory. Results show that increasing the temperature from 25 to 80 °C, hardness, reduced modulus, and yield strength of GO–SF–CNC nanocomposite dramatically increase by 112%, 40%, and 140% respectively, and creep displacements during constant load hold reduce by 53%. It is attributed to increasing in crystallizations in the nanocomposite because of increasing in β-sheet formations of SF material and reduction in water molecules in CNC material. However, at 100 °C, the mechanical properties deteriorate, and creep displacements increase because of water evaporation from the nanocomposite, making it weaker. Hardness-to-yield strength ratio is found within 1.84–2.06. Maximum creep exponent is 2.9 at 40 °C, which reduces to 2.06 at 80 °C and again increases to 2.27 at 100 °C. © 2022 Wiley-VCH GmbH.
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