Structure and spacing of cellulose microfibrils in woody cell walls of dicots

Lynne H. Thomas, V. Trevor Forsyth, Anne Martel, Isabelle Grillo, Clemens M. Altaner, Michael C. Jarvis

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The structure of cellulose microfibrils in situ in wood from the dicotyledonous (hardwood) species cherry and birch, and the vascular tissue from sunflower stems, was examined by wide-angle X-ray and neutron scattering (WAXS and WANS) and small-angle neutron scattering (SANS). Deuteration of accessible cellulose chains followed by WANS showed that these chains were packed at similar spacings to crystalline cellulose, consistent with their inclusion in the microfibril dimensions and with a location at the surface of the microfibrils. Using the Scherrer equation and correcting for considerable lateral disorder, the microfibril dimensions of cherry, birch and sunflower microfibrils perpendicular to the [200] crystal plane were estimated as 3.0, 3.4 and 3.3 nm respectively. The lateral dimensions in other directions were more difficult to correct for disorder but appeared to be 3 nm or less. However for cherry and sunflower, the microfibril spacing estimated by SANS was about 4 nm and was insensitive to the presence of moisture. If the microfibril width was 3 nm as estimated by WAXS, the SANS spacing suggests that a non-cellulosic polymer segment might in places separate the aggregated cellulose microfibrils.

Original languageEnglish
Pages (from-to)3887-3895
JournalCellulose
Volume21
Issue number6
DOIs
Publication statusPublished - 8 Oct 2014

Keywords

  • Crystallinity
  • SANS
  • Scherrer
  • WANS
  • WAXS
  • Wood

ASJC Scopus subject areas

  • Polymers and Plastics

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