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Size effects on the nanomechanical properties of cellulose I nanocrystals

Published online by Cambridge University Press:  23 September 2011

Anahita Pakzad ,
John Simonsen ,
Patricia A. Heiden  and
Reza S. Yassar
Anahita Pakzad
Affiliation:
Mechanical Engineering-Engineering Mechanics, Michigan Technological University, Houghton, Michigan 49931
John Simonsen
Affiliation:
College of Forestry, Oregon State University, Corvallis, Oregon 97331
Patricia A. Heiden
Affiliation:
Department of Chemistry, Michigan Technological University, Houghton, Michigan 49931
Reza S. Yassar*
Affiliation:
Mechanical Engineering-Engineering Mechanics, Michigan Technological University, Houghton, Michigan 49931
*
a)Address all correspondence to this author. e-mail: reza@mtu.edu
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Abstract

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 Iα/Iβ ratio and crystalline structure of CNCs.

Keywords

Elastic propertiesPolymerScanning probe microscopy
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 3: Focus Issue: Advances in Mechanics of One-Dimensional Micro/Nanomaterials , 14 February 2012 , pp. 528 - 536
Copyright
Copyright © Materials Research Society 2011

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