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首页> 外文期刊>Journal of Neuroscience Methods >Properties of electrolyte-filled glass microelectrodes: a model analysis.
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Properties of electrolyte-filled glass microelectrodes: a model analysis.

机译：电解质填充玻璃微电极的特性：模型分析。

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摘要

A novel dynamic mathematical microelectrode model (a model of solvent and solute kinetics in electrolyte-filled microelectrodes) was deduced from experimental observations made on standard (single-barrelled, 3.0 M KCl-filled, approximately 10 M[ohm]) electrodes using (a) electrodiffusion, electro-osmosis, and continuity equations that were placed into the constraints of electrode geometry, and (b) handbook/textbook parameter values, only. The model proved to be able to faithfully reproduce all observed electrochemical and electrical electrode properties, i.e. even those that constituted no part of the model's experimental basis. In theoretical tests, the model shows, for the standard electrode that (a) inside the electrode, any profiles in electrical potential and electrolyte concentration are occurring at the most distal part (approximately 50 microm) of the tip region, (b) asymmetrical shifts in electrolyte concentration just inside the electrode tip opening are the true cause of the electrode's current rectification, and (c) strong transelectrode currents are producing water flows across the electrode orifice that may affect the volume of smaller and medium-sized cells. In further tests, the model shows, among other things, for non-standard electrodes that (a) decreasing the electrode electrolyte concentration will give rise to marked decreases in electrolyte leakage from the electrode, but only very minor changes in tip potential, and (b) increasing the surface charge of the electrode glass (increases in zeta potential) and/or decreasing the electrode electrolyte concentration will produce increases in electro-osmotic water transport, which may be desirable for the intracellular injection of water-soluble (electro-neutral) substances.
机译：根据在标准（单桶，3.0 M KCl填充，约10 M [ohm]）电极上使用（a）的实验观察结果，推导了一种新型的动态数学微电极模型（电解质填充的微电极中的溶剂和溶质动力学模型）。 ）电扩散，电渗和连续性方程，这些方程被置于电极几何形状的约束中，并且（b）仅是手册/教科书的参数值。该模型被证明能够忠实地再现所有观察到的电化学和电电极性能，即使那些不构成模型实验基础的性能也是如此。在理论测试中，该模型显示，对于标准电极，（a）电极内部，在尖端区域的最远端（大约50微米）出现任何电位和电解质浓度分布图，（b）不对称位移电极尖端开口内部电解液浓度的升高是造成电极电流整流的真正原因，并且（c）强大的跨电极电流正在水流过电极孔时，可能会影响较小和中型电池的体积。在其他测试中，该模型显示，除其他事项外，该模型对于（a）非标准电极而言，（a）降低电极电解质浓度将导致电解质从电极泄漏的明显减少，但尖端电势仅有很小的变化，并且b）增加电极玻璃的表面电荷（增加zeta电位）和/或降低电极电解质的浓度将导致电渗水传输增加，这对于水溶性（电中性）的细胞内注射可能是理想的）物质。

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