利用时域核磁共振研究木材干燥过程水分状态变化

doi:10.11707/j.1001-7488.20141215

Abstract

Abstract:

Water states and migration in juvenile Xinjiang poplar (Populus alba var. pyramidalis) drying was studied by time-domain nuclear magnetic resonance (TD-NMR). Water in wood drying was investigated through free induction decay curve (FID) and transverse relaxation time(T2) of proton sensor in water molecules. The results showed that the difference was 1.84% between theoretical moisture content (71.90%) and actual one (73.74%) by using TD-NMR technique; the T2 distribution revealed the water states and migration in wood drying, also the bound water was slowly lost in the drying initial stage. The mass of different water states in juvenile wood during drying could be calculated according to peak areas of T2 distributing. Finally mathematical models for free water, bound water and the total water migration were developed in the drying process.

Key words: wood drying, time-domain NMR, FID, T2, free water, bound water, Populus alba var. pyramidalis, juvenile wood

CLC Number:

S781.33

Zhang Minghui, Li Xinyu, Zhou Yunjie, Gao Yulei. Water Status Change in Wood Drying Studied By Time-Domain NMR[J]. Scientia Silvae Sinicae, 2014, 50(12): 109-113.

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Water Status Change in Wood Drying Studied By Time-Domain NMR

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