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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Transverse Elasticity of Cellulose Nanocrystals Via Atomic Force Microscopy

Source: Tenth International Conference on Wood & Biofiber Plastic Composites and Cellulose Nanocomposites Sysmposium, May 11-13, Madison, WI. Madison, WI : Forest Products Society, c2010. ISBN 978-1-892529-55-8. pp. 309-316; 2010

Author(s)Ryan Wagner, Arvind Raman, and Robert Moon

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-3A

Abstract: The elastic properties of Cellulose Nanocrystals (CNCs) remain poorly characterized. Atomic force microscopy (AFM) methods were used to estimate the transverse elastic modulus (Et) of individual, isolated CNCs derived from Tunicates. Understanding Et is important because it may lead to a better understanding of how CNCs behave in composite materials. Previous molecular modeling studies have shown the Et for CNCs to be between 11 to 57 GPa and were dependent on crystallographic orientation. This value is smaller than the axial modulus of 120 to 147 GPa. The main focus of this research is the interpretation of the AFM force curve data and the modeling implications when extracting Et using analytic continuum contact mechanics. Approximately thirty force curves were analyzed along the length of a single CNC. The distribution of Et has a mean of 9 GPa and a standard deviation of 2.6 GPa; however, by considering the uncertainty in the applied curve fitting procedure, the range of Et can be considered to be between 2 and 37 GPa. This distribution of modulus was considered to be a result of measuring a quantity near the noise floor of the AFM scanning procedure, rather than material property variation along the CNC.

Keywords: Nanostructured materials, microstructure, nanotechnology, atomic force microscopy, elasticity, modulus of elasticity, nanocrystals, crystallization, flexure, cellulose, composite materials, mechanical materials, Urochordata, Tunicata, uncertainty, crystalline cellulose, transverse elasticity

Publication Review Process: Non-Refereed (Other)

File size: 899 kb(s)

Date posted: 05/17/2010
RITS Product ID: 35639
Current FPL Scientist associated with this product
Moon, Robert J.
Materials Research Engineer

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