Microwave-enhanced electrochemical processes in micellar surfactant media
Microwave-enhanced electrochemical processes in micellar surfactant media
复制标题
胶束表面活性剂介质中的微波增强电化学过程
DOI：
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
R. Compton
中科院分区：
文献类型：
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作者：
M. Ghanem;F. Marken;B. A. Coles;R. Compton
在十二烷基硫酸钠（SDS）胶束溶液中，25 μ m或50 μm直径的铂电极上的电子转移过程表现出高强度的微波辐射效应。首先，使用含有2 mM Fe（CN）63-和2 mM Fe（CN）64-的0.1 M NaCl水溶液（含和不含SDS）来校准电极温度和传质条件。添加0.1 M SDS对Fe（CN）63-/4−体系的微波增强伏安法只有很小的影响。接下来，研究了两种高度不溶于水的氧化还原体系。1 mM叔丁基二茂铁在含有0.1 M SDS的0.1 M NaCl水溶液中的溶液显示在没有微波的情况下不产生电流响应。在聚焦微波在铂盘电极的存在下，检测到一个强电流的叔丁基二茂铁的一个电子氧化，大概是由于局部破坏的胶束溶液。检测到低至微摩尔水平的叔丁基二茂铁的浓度。α-生育酚是一种亲脂性维生素和抗氧化剂，可溶于0.1 M SDS/0.1 M NaCl水溶液。在微波辐射下，α-生育酚的双电子氧化产生了强烈的浓度依赖性阳极电流响应。将七个单独的50 μm直径的铂微电极的七极阵列放置在约100 μ m的电极中。720 μm的距离，显示出允许微波增强电流增加七倍，每个电极表现出相同的微波效应。
High intensity microwave radiation effects are demonstrated for electron transfer processes at 25 or 50-μm diameter platinum electrodes immersed in micellar sodium dodecylsulfate (SDS) solutions. First, a solution containing 2 mM Fe(CN)63− and 2 mM Fe(CN)64− in aqueous 0.1 M NaCl with and without SDS is employed to calibrate the electrode temperature and mass transport conditions. Addition of 0.1 M SDS has only a small effect on the microwave enhanced voltammetry for the Fe(CN)63-/4− system. Next, two highly water-insoluble redox systems are studied. A solution of 1 mM tert-butylferrocene in aqueous 0.1 M NaCl containing 0.1 M SDS is shown to give no current response in the absence of microwaves. In the presence of focused microwaves at a platinum disc electrode, a strong current for the one electron oxidation of tert-butylferrocene is detected presumably due to localized disruption of the micellar solution. Concentrations of tert-butylferrocene down to the micromolar level are detected. α-Tocopherol, a lipophilic vitamin and antioxidant, is soluble in aqueous 0.1 M SDS/0.1 M NaCl. In the presence of microwave radiation, a strong and concentration dependent anodic current response consistent with the two-electron oxidation of α-tocopherol is observed. A heptode array of seven individual 50 μm diameter platinum microelectrodes placed in ca. 720 μm distance of each other is shown to allow microwave enhanced currents to be increased sevenfold with each electrode exhibiting the same microwave effect.
表面活性剂稳定乳液中维生素 B12 电催化还原二溴乙烷。
影响因子：
7.4
作者：
Rusling,JF;Connors,TF;Owlia,A
通讯作者：
Owlia,A