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Size effects on the nanomechanical properties of cellulose I nanocrystals

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https://ir.library.oregonstate.edu/concern/articles/d791sg70h

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  • The ultimate properties of a fibrous composite system depend highly on the transverse mechanical properties of the fibers. Here, we report the size dependency of transverse elastic modulus in cellulose nanocrystals (CNCs). In addition, the mechanical properties of CNCs prepared from wood and cotton resources were investigated. Nanoindentation in an atomic force microscope (AFM) was used in combination with analytical contact mechanics modeling (Hertz model) and finite element analysis (FEA) to estimate the transverse elastic moduli (Et) of CNCs. FEA modeling estimated the results more accurately than the Hertz model. Based on the AFM-FEA calculations, wood CNCs had higher transverse elastic moduli in comparison to the cotton CNCs. Additionally, Et was shown to increase with a reduction in the CNCs' diameter. This size-scale effect was related to the Ia/Ib ratio and crystalline structure of CNCs.
  • This is the publisher’s final pdf. The published article is copyrighted by Materials Research Society and can be found at: http://www.mrs.org/home/.
  • Keywords: Microcrystalline cellulose, Atomic force microscopy, crystal structure, Elastic modulus, Native cellulose, Synchrotron x-ray, Micromechanical properties, Hydrogen bonding system, Neutron fiber diffraction, Polymer nanocomposites
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  • Pakzad, A., Simonsen, J., Heiden, P., & Yassar, R. (2012). Size effects on the nanomechanical properties of cellulose I nanocrystals. Journal of Materials Research, 27(3), 528-536. doi: 10.1557/jmr.2011.288
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  • 27
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  • 3
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  • The authors acknowledge the National Science Foundation for the Grant No. 0820884 from the Division of Materials Research (DMR) and the Grant No. 11000806/ 1100572 from DMR and Civil, Mechanical, and Manufacturing Innovation (CMMI) divisions.
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