The study of dielectric properties of 4A zeolites dispersed in silicone oil

The study of dielectric properties of 4A zeolites dispersed in silicone oil
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4A沸石硅油分散介电性能研究

DOI:
10.1016/j.colsurfa.2007.09.024
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发表时间:
2008-03
影响因子:
5.2
通讯作者:
Zhou, Wei
Zhou, Wei
中科院分区:
化学2区
文献类型:
--
作者:
Zhao, Kong Shuang;Zhou, Wei

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为了研究沸石电流变液的介电本底,在40 ~ 110 MHz频率范围内测量了分散在硅油中的4A沸石的介电性能,观察到两个弛豫过程。提出了介电弛豫的可能机制:钠离子在超笼中的迁移运动导致低频弛豫,而高频弛豫则是由钠离子在活性位上的跳跃引起的.介电分析表明,适当的浓度、腔内水的存在以及频率对钠离子在固体骨架中的运动有很大的影响。通过对相参数的分析,给出了电场作用下沸石颗粒的真实的介电常数,为偶极子静电相互作用的精确计算提供了保证。
The dielectric properties of 4A zeolites dispersed in silicone oil are measured in the frequency range of 40Hz to 110MHz for elucidating the dielectric background of zeolites electrorheological (ER) fluid, and two relaxations are observed. The possible mechanisms of the dielectric relaxations are suggested that the transfer motion of sodium ions in supercage is contributed to the low-frequency relaxation, and the high-frequency relaxation is raised from the hopping of sodium ions restricted on active sites. The dielectric analyzing indicates that appropriate concentration, presence of water in cavity and the frequency strongly affect the motion of sodium ion inside the solid-state framework. As well as the analysis of the phase parameters offers real permittivity of zeolite particle under electric field, and insures the accurate calculation for electrostatic interaction of dipole.
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