Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Jairo A. Diaz; Xiawa Wu; Ashlie Martini; Jeffrey P. Youngblood; Robert J. Moon
    Date: 2013
    Source: Biomacromolecules 2013, Volume 14, 2013; pp. 2900-2908.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (4.22 MB)


    The coefficient of thermal expansion (CTE) of cellulose nanocrystal (CNC) films was characterized using novel experimental techniques complemented by molecular simulations. The characteristic birefringence exhibited by CNC films was utilized to calculate the in-plane CTE of selforganized and shear-oriented self-standing CNC films from room temperature to 100 °C using polarized light image correlation. CNC alignment was estimated via Hermans order parameter (S) from 2D X-ray diffraction measurements. We found that films with no preferential CNC orientation through the thickness (S: ~­0.0) exhibited an isotropic CTE (~­25 ppm/K). In contrast, films with aligned CNC orientations (S: ~0.4 to 0.8) had an anisotropic CTE response: For the highest CNC alignment (S: 0.8), the CTE parallel to CNC alignment was ~­9 ppm/K, while that perpendicular to CNC alignment was ~158 ppm/K. CNC film thermal expansion was proposed to be due primarily to single crystal expansion and CNC-CNC interfacial motion. The relative contributions of inter- and intracrystal responses to heating were explored using molecular dynamics simulations.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Diaz, Jairo A.; Wu, Xiawa; Martini, Ashlie; Youngblood, Jeffrey P.; Moon, Robert J. 2013. Thermal expansion of self-organized and shear-oriented cellulose nanocrystal films. Biomacromolecules. 14: 2900-2908.


    Google Scholar


    cellulose nanocrystals, Herman's Order parameter, Coefficient Thermal Expansion, digital image correlation

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page