Fukada E, Ueda H, Rinaldi R
Biophys J. 1976 Aug;16(8):911-8. doi: 10.1016/S0006-3495(76)85741-4.
Two piezoelectric constants (polarization per unit stress, d=d'-id'', and polarization per unit strain, e=e'-ie''), the elastic constant, and dielectric constant are determined for oriented collagen at different hydration levels at 10 Hz from -150 to 50 degrees C. With no hydration (approximately 0% H2O), d' increases slightly with higher temperatures, while e' decreases slightly. Near 11 wt% H2O, both d' and e' increase then decrease around 0 degrees C, and is probably caused by an increase of the dielectric constant and the ionic conductivity in the nonpiezoelectric phase. Hydration greater than 25 wt%, d' and e' decrease above -50 degrees C which is considered to be due to a greater ionic conductivity surrounding the piezoelectric phase.
在10赫兹、温度从-150摄氏度到50摄氏度的条件下，测定了不同水化水平的取向胶原的两个压电常数（单位应力下的极化，d = d'-id''，以及单位应变下的极化，e = e'-ie''）、弹性常数和介电常数。在无水化（约0% H₂O）时，d'随温度升高略有增加，而e'略有下降。在接近11 wt% H₂O时，d'和e'在0摄氏度左右先增加后减少，这可能是由于非压电相中介电常数和离子电导率增加所致。水化大于25 wt%时，d'和e'在高于-50摄氏度时下降，这被认为是由于压电相周围离子电导率增加所致。
