Moisture Sorption in Wood Studied by Time Domain Nuclear Magnetic Resonance

doi:10.11938/cjmr20160212

Abstract

Abstract:

The mechanical properties and dimensional stability of wood are influenced by moisture sorption. Understanding changes of the state of water during wood sorption has great significance. In this study, the state and relaxation property of water in American yellow poplar and red oak during the sorption process were investigated by time-domain nuclear magnetic resonance (TD-NMR). It was found that, in both species, the peak area of bound water increased rapidly during the first 4 hours of the sorption process, while the peak area of free water showed no obvious change. These results suggested that water amount increases in the early sorption stage could mainly be attributed to bound water. Under the equilibrium condition of moisture sorption, the peak area of free water in red oak doubled that in American yellow poplar, likely due to the pore aperture of former is bigger than the later, providing more space for absorbed free water. It was also observed that the amount and rate of free water sorption were higher in red oak than in American yellow poplar.

Key words: time-domain nuclear magnetic resonance (TD-NMR), wood sorption, free induction decay (FID), spin-spin relaxation time (T₂), yellow poplar, red oak

CLC Number:

O482.53

GAO Yu-lei, ZHANG Ming-hui. Moisture Sorption in Wood Studied by Time Domain Nuclear Magnetic Resonance[J]. Chinese Journal of Magnetic Resonance, 2016, 33(2): 295-304.

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