PIEZOELECTRIC ADMITTANCE MEASUREMENTS OF MONTMORILLONITE POLY(VINYL ALCOHOL) COMPOSITE FILM-COATED QUARTZ CRYSTAL-OSCILLATORS

被引:13
作者
OKAJIMA, T
SAKURAI, H
OYAMA, N
TOKUDA, K
OHSAKA, T
机构
[1] TOKYO UNIV AGR & TECHNOL, DEPT APPL CHEM, 2-24-16 NAKA MACHI, KOGANEI, TOKYO 184, JAPAN
[2] TOKYO INST TECHNOL, GRAD SCH NAGATSUTA, YOKOHAMA, KANAGAWA 227, JAPAN
关键词
D O I
10.1246/bcsj.65.1884
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The piezoelectric admittance measurements of montmorillonite/poly(vinyl alcohol) (PVA) composite film-coated quartz crystal oscillators were performed in air dried over silica gel, in an atmosphere of moisture with 100% relative humidity at 25-degrees-C and in contact with Na2SO4 aqueous solutions. By use of the electrical equivalent circuit model conventionally proposed for a piezoelectric quartz crystal, the relevant circuit parameters; resistance R, inductance L, and capacitance C were evaluated as a function of the Na2SO4 concentration (0.01-1.0 M (1 M=1 mol dm-3)). R was almost constant above ca. 0.35 M and increased with decreasing the concentration in the lower concentrations, while L and C were almost independent of the concentration. On the basis of the electrolyte concentration dependence of R, the structural change of the clay/PVA composite film due to swelling with the electrolyte is discussed in comparison with the results for the clay film.
引用
收藏
页码:1884 / 1890
页数:7
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