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首页> 外文期刊>ACS applied materials & interfaces >Electroactive Self-Assembled Monolayers Detect Micelle Formation
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Electroactive Self-Assembled Monolayers Detect Micelle Formation

机译：电活性自组装单层检测胶束形成

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摘要

The interfacial electrochemistry of self-assembled monolayers (SAMs) of ferrocenyldodecanethiolate on gold (FcC(12)SAu) electrodes is applied to detect the micellization of some common anionic surfactants, sodium n-alky sulfates, sodium n-alkyl sulfonates, sodium diamyl sulfosuccinate, and sodium dodecanoate, in aqueous solution by cyclic voltammetry. The apparent formal redox potential (E degrees'(sAm)) of the FcC12SAu SAM is used to track changes in the concentration of the unaggregated surfactant anions and determine the critical micelle concentration (cmc). The effect of added salt (NaF) on the sodium alkyl sulfate concentration dependence of E degrees'(sAm) is also investigated. Weakly hydrated anions, such as ClO4-, pair with the electrogenerated SAM bound ferroceniums to neutralize the excess positive charge created at the SAM/electrolyte solution interface and stabilize the oxidized cations. E degrees'(sAm) exhibits a Nernstian-type dependence on the anion activity in solution: Aggregation of the surfactant anions into micelles above the cmc causes the free surfactant anion activity to deviate from the molar concentration of added surfactant, resulting in a break in the plot of E degrees'(sAm) versus the logarithm of the concentration of anionic surfactant The concentration at which this deviation occurs is in good agreement with literature or experimentally determined values of the cmc. The effects of Ohmic potential drop, liquid junction potential, and surfactant adsorption behavior on E degrees'(SAM), are addressed. Ultimately, the E degrees'(SAM),, response as a function of the anionic surfactant concentration exhibits the same features reported using potentiometry and surfactant ion-selective electrodes, which provide a direct measure of the free surfactant anion activity, thus making FcC(12)SAu SAM electrodes useful for the detection of surfactant aggregation and micelle formation.
机译：施用菲罗罗基二甲二烯二丁二二甲酸二甲醛（FCC（12）SAU）电极的自组装单层（SAMS）的界面电化学，以检测一些常见阴离子表面活性剂，N-烷基硫酸钠钠，N-烷基磺酸钠，二氨基磺酸钠胶束化和十二烷酸钠，通过环状伏安法在水溶液中。 FCC12SAU SAM的表观正式氧化还原电位（e度'（SAM））用于跟踪未聚集的表面活性阴离子浓度的变化，并确定临界胶束浓度（CMC）。还研究了添加的盐（NAF）对硫酸氢钠浓度依赖于e度'（SAM）的影响。弱水合阴离子，例如ClO 4 - ，与发电SAM结合的亚铁鎓对，以中和在SAM /电解质溶液界面处产生的过量的正电荷并稳定氧化阳离子。 E度'（SAM）表现出对溶液中的阴离子活性的NERNSTIAN型依赖性：表面活性剂阴离子的聚集成CMC上方的胶束使得游离表面活性剂阴离子活性偏离加入表面活性剂的摩尔浓度，导致突破E度'（SAM）的曲线与阴离子表面活性剂浓度的对数，这种偏差发生的浓度与CMC的文献或实验确定的值吻合良好。解决了欧姆势下降，液态结电位和表面活性剂吸附行为对e度'（SAM）的影响。最终，作为阴离子表面活性剂浓度的函数的e度'（SAM），响应表现出使用电位测量和表面活性剂离子选择性的相同的特征，其提供自由表面活性剂阴离子活性的直接测量，从而制造FCC（ 12）SAU SAM电极可用于检测表面活性剂聚集和胶束形成。

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