New piezoelectric moduli of wood: d(31) and d(32)

作者：Hirai Nobuyuki; Sobue Nobuo^*; Date Munehiro

来源：Journal of Wood Science, 2011, 57(1): 1-6.

DOI：10.1007/s10086-010-1133-2

• Wood
• Piezoelectric modulus
• d(31), d(32), and d(36)
• Cellulose-I crystal
• Piezoelectric polarity

This article reports the piezoelectric moduli of wood d (31), d (32), and d (36). The piezoelectric moduli of wood d (31) and d (32) have not been previously reported, although there has been much research on the d (14) and d (25) moduli of wood. The moduli d (31), d (32), and d (36) were measured carefully because their absolute values were considerably smaller than those of d (14) and d (25). For Softwoods, d (36) values were mostly negative, whereas the values for hardwoods had either positive or negative values. The other moduli, d (31) and d (32), were a mixture of positive and negative values in softwoods and hardwoods. The existence of d (31) and d (32) suggests the presence of an electrical polarity of the cellulose crystal in the fiber direction of the wood. The polarities of d (31) and d (32) became clear from wood in the outer part of the trunk, where the crystallinity of cellulose is large and the alignment of the crystals becomes parallel to the fiber direction.

• 出版日期2011-2