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利用介电谱方法研究了NaA沸石/硅油和NaA沸石/煤油两种电流变液的介电行为,测量发现两体系在105Hz处均出现明显的弛豫现象.采用单弛豫Cole-Cole函数拟合各体系的介电参数,结果表明在相同体积分数条件下硅油体系具有较大的介电增量(△ε),且两体系的介电增量与体积分数(φ)均服从△ε=4εmφ的函数关系.通过计算和分析粒子与介质间介电失配程度,阐明了油介质的介电常数(εm)对于沸石电流变液界面极化强度的贡献.此外研究了吸附水对沸石电流变液界面极化的影响,结果发现水的吸附对于体系的△ε值没有影响,但明显降低了弛豫时间,证明吸附水对沸石电流变液的界面极化率具有增强作用.
The dielectric behavior of NaA zeolite / silicone oil and NaA zeolite / kerosene was studied by means of dielectric spectroscopy. The results show that both systems show significant relaxation at 105 Hz. The single-relaxation Cole-Cole function The dielectric parameters of the system were compared. The results show that the silicone oil system has larger dielectric increment (△ ε) under the same volume fraction, and the dielectric increment and volume fraction (φ) 4εmφ.The contribution of the dielectric constant (εm) of the oil medium to the polarization of the zeolitic ER fluid interface was clarified by calculating and analyzing the degree of dielectric mismatch between the particles and the medium.In addition, the influence of adsorbed water on zeolite current The results show that the adsorption of water has no effect on the △ ε value of the system, but significantly reduces the relaxation time, which proves that the adsorbed water has an enhanced effect on the interfacial polarization of the ER fluid.