Double layer forces over large potential ranges as measured in an electrochemical surface forces apparatus
Double layer forces over large potential ranges as measured in an electrochemical surface forces apparatus
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DOI：
10.1021/la011087k
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发表时间：
2001-11-27
期刊：
影响因子：
3.9
通讯作者：
Vanderlick, TK
中科院分区：
文献类型：
--
作者：
Fréchette, J;Vanderlick, TK
采用专门设计的表面力装置（SFA）中使用的电极来研究云母和多晶金之间的力在电位控制下。这种控制是通过将导线焊接到金表面并将SFA的腔室修改为三电极电池配置来实现的。所测量的相互作用是所施加的电极电位的强函数，随着金电位向更负的电位移动而更排斥。云母表面之间的独立力的测量进行，以确定云母表面电位。的实验结果进行了比较，Derjaguin-Landau-Verwey-Overbeek（DLVO）的预测不同的带电表面之间的力。长程力与DLVO预测吻合良好，包括在高施加电位时力饱和的证据;短程力偏离理论。
Electrodes specifically designed for use in the surface forces apparatus (SFA) were employed to study forces between mica and polycrystalline gold under potential control. This control was achieved by soldering a wire to the gold surface and modifying the chamber of the SFA into a three-electrode cell configuration. The interactions measured were a strong function of the applied electrode potential, being more repulsive as the gold potential was moved toward more negative potentials. Independent force measurements between mica surfaces were done to determine the mica surface potential. The experimental results were compared to Derjaguin-Landau-Verwey-Overbeek (DLVO) predictions of the forces between dissimilar charged surfaces. The long range forces correspond well to DLVO predictions, including evidence of saturation in forces at high applied potentials; forces deviate from theory at short range.