Skip to Main Content
Effect of thermo-mechanical refining pressure on the properties of wood fibers as measured by nanoindentation and atomic force microscopyAuthor(s): Cheng Xing; Siqun Wang; George M. Pharr; Leslie H. Groom
Source: Holzforschung, Vol. 62, pp. 230?236, 2008
Publication Series: Miscellaneous Publication
PDF: View PDF (364 KB)
DescriptionRefined wood fibers of a 54-year-old loblolly pine (Pinus taeda L.) mature wood were investigated by nanoindentation and atomic force microscopy (AFM). The effect of steam pressure, in the range of 2?18 bar, during thermomechanical refining was investigated and the nanomechanical properties and nano- or micro-level damages of the cell wall were evaluated. The results indicate that refining pressure has important effects on the physical and mechanical properties of refined fibers. No obvious damage was observed in the cell walls at pressures between 2 and 4 bar. Nano-cracks (most less than 500 nm in width) were found in fibers at pressures in the range of 6?12 bar, and micro-cracks (more than 5 mm in width) were found in fibers subjected to pressures of 14 and 18 bar. The damages caused at higher pressures were more severe in layers close to the lumen than on the fiber surfaces. Under special circumstances, the S3 layer was heavily damaged. The natural shape of the cross sectional dimensions of the cell walls was not changed at lower pressures (2 and 4 bar), but, as pressure was increased, the fibers tended to collapse. At pressures around 18 bar, the lumina were augmented again. The nano-mechanical properties in terms of elastic modulus and hardness were obviously decreased, while nanoindentation creep increased with refining pressure.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- 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.
CitationXing, Cheng; Wang, Siqun; Pharr, George M.; Groom, Leslie H. 2008. Effect of thermo-mechanical refining pressure on the properties of wood fibers as measured by nanoindentation and atomic force microscopy. Holzforschung, Vol. 62, pp. 230?236, 2008
Keywordsatomic force microscopy (AFM), nanoindentation, nano-mechanical properties, refined fiber, thermomechanical refining
- Changes in the chemical composition and spectroscopy of loblolly pine medium density fiberboard furnish as a function of age and refining pressure
- Characterizing the surface roughness of thermomechanical pulp fibers with atomic force microscopy
- The Frequency and Anatomical Characteristics of Anomalous Dark Rings in Black Cherry, and Their Relation to Cherry Scallop Shell Moth Defoliations
XML: View XML