接触前扫描电解质的电荷诱导变形

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Liang Liu
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引用次数: 0

摘要

扫描电化学探针技术的最新发展主要集中在扫描电解质的策略上。例如,扫描电化学电池显微镜(SECCM)是将电解质固定在玻璃毛细管中,而扫描凝胶电化学显微镜(SGECM)是将凝胶电解质固定在微盘电极或蚀刻金属丝上。扫描凝胶电化学显微镜和扫描凝胶电化学显微镜的第一步都是使电解质探针与样品接触,这通常是通过探针和样品之间的恒定电位电流反馈来实现的。这项工作试图从理论上分析电解质在接近过程中的变形。对于 SECCM 中的液态电解质,在轴对称的二维圆柱坐标中,考虑了表面张力来抵消重力和静电力。平衡时的变形在一定条件下求解。对于凝胶电解质,采用简化的一维几何形状分析粘弹性凝胶。同时考虑了平衡和动态两种方法。结果表明,对于液体和凝胶电解质,都存在打破平衡的临界条件。当外加电势高于临界值或距离小于临界值时,力将不会平衡,电解质将变形直至接触。临界条件取决于电解质的特性(液体的表面张力,凝胶的弹性和粘性模量)和几何形状(液体的毛细管半径,凝胶的厚度)。此外,还讨论了进一步扩展这项工作的前景,使其更接近实际实验场景,特别是 SGECM。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Charge induced deformation of scanning electrolyte before contact
The recent developments of scanning electrochemical probe techniques focus on the strategy of scanning electrolyte. For example, scanning electrochemical cell microscopy (SECCM) is based on holding the electrolyte in a glass capillary, while scanning gel electrochemical microscopy (SGECM) immobilizes the gel electrolyte on micro-disk electrodes or etched metal wires. In both SECCM and SGECM, the first and essential step is to approach the electrolyte probe to be in contact with the sample, which is very often achieved by current feedback with a constant applied potential between the probe and the sample. This work attempts to theoretically analyse the deformation of electrolyte during this approaching process. For liquid electrolyte in SECCM, surface tension is considered to counterbalance the gravity and electrostatic force in 2D cylindrical coordinates with axial symmetry. The deformation at equilibrium is solved under certain conditions. For gel electrolyte, a viscoelastic gel is analysed with simplified 1D geometry. Both equilibrium and dynamic approaching are considered. The results suggest that for both liquid and gel electrolytes, critical conditions exist for breaking the equilibrium. When applied potential is higher or the distance is lower than the threshold, the force will not equilibrate and the electrolyte will deform until contact. The critical condition depends on the properties (surface tension for liquid, elastic and viscous modulus for gel) and geometry (radius of capillary for liquid, thickness for gel) of electrolyte. Prospects of further extending the work closer to real experimental scenarios, especially SGECM, are also discussed.
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来源期刊
Faraday Discussions
Faraday Discussions 化学-物理化学
自引率
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发文量
259
期刊介绍: Discussion summary and research papers from discussion meetings that focus on rapidly developing areas of physical chemistry and its interfaces
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