Deswelling of microfibril bundles in drying wood studied by small-angle neutron scattering and molecular dynamics

Aleksi Zitting*, Antti Paajanen, Lauri Rautkari, Paavo A. Penttilä

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

15 Sitaatiot (Scopus)
62 Lataukset (Pure)

Abstrakti

Structural changes of cellulose microfibrils and microfibril bundles in unmodified spruce cell wall due to drying in air were investigated using time-resolved small-angle neutron scattering (SANS). The scattering analysis was supported with dynamic vapor sorption (DVS) measurements to quantify the macroscopic drying kinetics. Molecular dynamics (MD) simulations were carried out to aid in understanding the molecular-level wood-water interactions during drying. Both SANS experiments and simulations support the notion that individual cellulose microfibrils remain relatively unaffected by drying. There is, however, a significant decrease in fibril-to-fibril distances in microfibril bundles. Both scattering and DVS experiments showed two distinct drying regions: constant-rate drying and falling-rate drying. This was also supported by the MD simulation results. The shrinking of the fibril bundles starts at the boundary of these two regions, which is accompanied by a strong decrease in the diffusivity of water in between the microfibrils.

AlkuperäiskieliEnglanti
Sivut10765-10776
Sivumäärä12
JulkaisuCellulose
Vuosikerta28
Numero17
Varhainen verkossa julkaisun päivämäärä26 syysk. 2021
DOI - pysyväislinkit
TilaJulkaistu - marrask. 2021
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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