, Volume 21, Issue 5, pp 3193–3201 | Cite as

Mesoporous structures in never-dried softwood cellulose fibers investigated by nitrogen adsorption

  • Minoru Kimura
  • Zi-Dong Qi
  • Hayaka Fukuzumi
  • Shigenori Kuga
  • Akira Isogai
Original Paper


Nitrogen adsorption was used to characterize mesoporous structures in never-dried softwood cellulose fibers. Distinct inflections in desorption isotherms were observed over the relative vapor pressure (P/P0) range of 0.5–0.42 for never-dried cellulose fibers and partially delignified softwood powders. The reduction in N2 adsorption volume was attributed to cavitation of condensed N2 present in mesopores formed via lignin removal from wood cell walls during delignification. The specific surface areas of significantly delignified softwood powders were ~150 m2 g−1, indicating that in wood cell walls 16 individual cellulose microfibrils, each 3–4 nm in width, form one cellulose fibril bundle surrounded with a thin layer of lignin and hemicelluloses. Analysis of N2 adsorption isotherms indicates that mesopores in the softwood cellulose fibers and partially delignified softwood powders had peaks ranging from 4 to 20 nm in diameter.


Cellulose microfibril Mesopore Nitrogen adsorption Pore-size distribution Softwood cellulose 



The authors thank Mrs. M. Nakano and H. Meguro, Nippon BEL Co. Ltd., Japan, for their useful technical suggestions and discussion. This research was supported by Grants-in-Aids for Scientific Research (Grant Numbers 21228007 and 23688020) from the Japan Society for the Promotion of Science (JSPS).

Supplementary material

10570_2014_342_MOESM1_ESM.doc (331 kb)
Supplementary material 1 (DOC 331 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Minoru Kimura
    • 1
  • Zi-Dong Qi
    • 1
  • Hayaka Fukuzumi
    • 1
  • Shigenori Kuga
    • 1
  • Akira Isogai
    • 1
  1. 1.Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo-ku, TokyoJapan

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