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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrochemical Investigation of Hemispherical Microdroplets of N,N-Didodecyl-N',N'-diethylphenylenediamine Immobilized as Regular Arrays on Partially-Blocked Electrodes: A New Approach to Liquid|Liquid Voltammetry
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Electrochemical Investigation of Hemispherical Microdroplets of N,N-Didodecyl-N',N'-diethylphenylenediamine Immobilized as Regular Arrays on Partially-Blocked Electrodes: A New Approach to Liquid|Liquid Voltammetry

机译：N，N-双十二烷基-N'，N'-二乙基苯二胺固定在部分封闭电极上的规则阵列的半球形微滴的电化学研究：液体伏安法的新方法

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A regular array of identically sized microdroplets of 2.5 mu m radius of the water-insoluble liquid N,N-didodecyl-N',N'-diethylphenylenediarnine (DDPD) is immobilized on the nonconducting hydrophobic polymer blocks of a gold partially blocked electrode. Cyclic voltammetric and chronoamperometric measurements for the oxidation of the DDPD microdroplets immersed in an aqueous solution are then recorded for different electrolytes (NaClO4, NaCl, NaBr, NaNO3, Na2SO4, and NaF). Specifically, the cyclic-voltammetric measurements allow us for the first time ever to observe a pre-peak, which can be interpreted as the movement of charge across the surface of the hemispherical droplets before the bulk material of the droplets gets oxidized. Conversion of the whole bulk material in all droplets is obtained by chronoamperometry. The resulting current-time responses show Cottrellian diffusion at sufficiently short times and are modeled by simulating diffusion through the droplet revealing complex behavior, which is likely to be related to anion dehydration and/or tight and weak ion-pair formation.
机译：半径为2.5μm的水不溶性液体N，N-双十二烷基-N'，N'-二乙基苯二胺（DDPD）的规则排列的大小相同的规则微滴固定在金部分封闭的电极的非导电疏水性聚合物嵌段上。然后记录不同电解质（NaClO4，NaCl，NaBr，NaNO3，Na2SO4和NaF）对浸泡在水溶液中的DDPD微滴氧化的循环伏安法和计时电流法测量值。具体而言，循环伏安测量使我们首次观察到预峰，这可以解释为在液滴的大块材料被氧化之前，电荷在半球形液滴表面上的运动。通过计时安培法获得全部散料在所有液滴中的转化。产生的电流时间响应在足够短的时间内显示出Cottrellian扩散，并且通过模拟通过液滴的扩散来建模，从而揭示了复杂的行为，这很可能与阴离子脱水和/或紧密而弱的离子对形成有关。

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