导电液体样品的四接触阻抗谱
Four-contact impedance spectroscopy of conductive liquid samples
摘要：
我们提出了一种改进的方法，使用四电极测量导电液体样品的阻抗谱。我们的方法使导电液体的阻抗测量下降到亚赫兹频率，避免电极极化效应，通常削弱标准阻抗分析仪。我们已经成功地用氯化钾和明胶的水溶液测试了我们的装置。第一种物质显示出从$\sim$ 100 kHz到sub-Hz范围的平坦光谱，而明胶的结果清楚地显示出存在两种不同的低频导电弛豫。
英文摘要：
We present an improved approach to the impedance spectroscopy of conductive liquid samples using four-electrode measurements. Our method enables impedance measurements of conductive liquids down to the sub-Hertz frequencies, avoiding the electrode polarization effects that usually cripple standard impedance analysers. We have successfully tested our apparatus with aqueous solutions of potassium chloride and gelatin. The first substance has shown flat spectra from $\sim$100 kHz down to sub-Hz range, while the results on gelatin clearly show the existence of two distinct low frequency conductive relaxations.
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