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arXiv 1010.4089physics.chem-ph
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低频下水的介电谱:等容点的存在

Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point

A. Angulo-Sherman, H. Mercado-Uribe

摘要:

我们已经研究了水的介电常数的实部从100 Hz到1 MHz。我们已经发现,有一个频率的介电常数与温度无关,并称之为等容点。低于该点时,介电常数随温度增加,高于该点时,介电常数随温度降低。为了理解这种行为,我们将水视为两种物质的系统:离子和偶极子。第一种情况产生了所谓的Maxwell-Wagner-Sillars效应,第二种情况服从Maxwell-Boltzmann统计。在等容点,两种机制在介电响应中的作用相互补偿。

英文摘要:

We have studied the real part of the dielectric constant of water from 100 Hz to 1 MHz. We have found that there is a frequency where the dielectric constant is independent of temperature, and called this the isopermitive point. Below this point the dielectric constant increases with temperature, above, it decreases. To understand this behavior, we consider water as a system of two species: ions and dipoles. The first give rise to the so called Maxwell-Wagner-Sillars effect, the second obey the Maxwell-Boltzmann statistics. At the isopermitive point the effect of both mechanisms in the dielectric response compensate each other.

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