为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,...为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,对溶液电导率具有较高的测量精度,并能够实现绝对测量.基于Van Der Pauw法的电导池常数κ仅与电极长度有关的原则,设计几种不同电极长度的电极,开展多种不同电导率溶液的测量实验,得出不同电导池常数κ的最佳测量范围.运用电导池常数为0.1cm-1的电极,对电导率为20~500μS/cm内的多个实际水样进行测量,相对误差小于1.0%.结果表明该新型电导率测量方法具有很好的应用前景和推广价值.展开更多
The cause of Warburg impedance on the impedance spectra for copper electrode in low-conductivity solution has been studied. The slopes of Randles plots (Warburg coefficients) do not change with dissolved oxygen concen...The cause of Warburg impedance on the impedance spectra for copper electrode in low-conductivity solution has been studied. The slopes of Randles plots (Warburg coefficients) do not change with dissolved oxygen concentration and strring rate, but they increase with the increase of the pH of solution and driesion time. The experimental results show that the Warburg twedance at low frequencies is caused by the diffusion of copper ions from the inner side to the outer side of the oxide film on the surface of copper electrode.展开更多
文摘为实现对于电导率的准确测量,研究Van Der Pauw原理及其应用于电导率绝对测量的理论依据,设计径轴二维可调的四电极结构.分析电极的对称性、电导池的封闭性对测量结果的影响,实验结果证明对称性好、结构封闭的Van Der Pauw法电导率计,对溶液电导率具有较高的测量精度,并能够实现绝对测量.基于Van Der Pauw法的电导池常数κ仅与电极长度有关的原则,设计几种不同电极长度的电极,开展多种不同电导率溶液的测量实验,得出不同电导池常数κ的最佳测量范围.运用电导池常数为0.1cm-1的电极,对电导率为20~500μS/cm内的多个实际水样进行测量,相对误差小于1.0%.结果表明该新型电导率测量方法具有很好的应用前景和推广价值.
文摘The cause of Warburg impedance on the impedance spectra for copper electrode in low-conductivity solution has been studied. The slopes of Randles plots (Warburg coefficients) do not change with dissolved oxygen concentration and strring rate, but they increase with the increase of the pH of solution and driesion time. The experimental results show that the Warburg twedance at low frequencies is caused by the diffusion of copper ions from the inner side to the outer side of the oxide film on the surface of copper electrode.