AFM Based Nanomechanical Characterization of Cellulose Nanofibril. (December 2020)

• Record Type: Journal Article
• Authors: Parvej, M Subbir; Wang, Xinnan; Jiang, Long
• Is Part Of: Journal of composite materials. Volume 54:Number 28(2020)
• Page Start: 4487
• Page End: 4493
• Publication Date: 2020-12
• Subjects: AFM -- nanomechanical characterization -- nanoindentation -- natural fiber -- CNF -- NFC -- cellulose -- transverse elastic modulus -- extended JKR model; Composite materials -- Periodicals; Composites -- Périodiques; 620.118
• DOI: 10.1177/0021998320933955
• Languages: English
• ISSNs: 0021-9983

Abstract

Cellulose nanofibril (CNF) is the fundamental unit of almost all types of natural fibers and is regarded as one of the main factors that influence their mechanical properties. Besides, owing to having a high aspect ratio, it is increasingly being used in the research of nanocomposite as a reinforcement recently. In order to utilize CNF as reinforcement more effectively, it is important to have a comprehensive idea about the mechanical properties of individual CNFs. Most of the studies are focused on the elastic modulus in the longitudinal direction, but the study of the elastic modulus in the transverse direction is still lacking. In this study, a single strand of CNF was subjected to an atomic force microscopy to characterize the surface morphology of CNF and determine the transverse elastic modulus through nanoindentation. The transverse elastic modulus of CNF was calculated to be 6.9± 0.4 GPa using extended JKR model.