Dielectric Constant of Liquids Confined in the Extended Nanospace Measured by a Streaming Potential Method
Dielectric Constant of Liquids Confined in the Extended Nanospace Measured by a Streaming Potential Method
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DOI：
10.1021/ac504141j
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发表时间：
2015-02-03
影响因子：
7.4
通讯作者：
Kitamori, Takehiko
中科院分区：
文献类型：
--
作者：
Morikawa, Kyojiro;Kazoe, Yutaka;Kitamori, Takehiko
了解被限制在扩展纳米空间(10-1000 nm)中的液体的结构和电学性质对于纳米流体学和纳米化学非常重要。要了解这些液体的性质，需要测定限制在扩展纳米空间中的液体的介电常数。因此，利用流动电位法开发了一种新的用于扩展纳米空间的介电常数测量方法。我们重点研究了扩展纳米空间中的非稳态流动电势，并在没有使用探针分子的情况下成功地测量了其中液体的介电常数。水的介电常数比块体的介电常数显著降低了约3倍。这一结果为进一步了解扩展纳米空间中的化学和流体动力学提供了关键信息。
Understanding liquid structure and the electrical properties of liquids confined in extended nanospaces (10-1000 nm) is important for nanofluidics and nanochemistry. To understand these liquid properties requires determination of the dielectric constant of liquids confined in extended nanospaces. A novel dielectric constant measurement method has thus been developed for extended nanospaces using a streaming potential method. We focused on the nonsteady-state streaming potential in extended nanospaces and successfully measured the dielectric constant of liquids within them without the use of probe molecules. The dielectric constant of water was determined to be significantly reduced by about 3 times compared to that of the bulk. This result contributes key information toward further understanding of the chemistry and fluidics in extended nanospaces.