Effect of Fatty Alcohol Monolayers on the Rate of Bromine Transfer across the Water/Air Interface: Assessment of Candidate Models Using Scanning Electrochemical Microscopy
作者： Jie Zhang , Patrick R. Unwin
DOI: 10.1021/LA011051S
关键词: Solution of Schrödinger equation for a step potential 、 Scanning electrochemical microscopy 、 Aqueous solution 、 Chronoamperometry 、 Ultramicroelectrode 、 Analytical chemistry 、 Monolayer 、 Chemistry 、 Fatty alcohol 、 Reaction rate constant
摘要: The effect of fatty alcohol monolayers on the rate constant for Br2 transfer across water/air (W/A) interface has been investigated using scanning electrochemical microscopy−double potential step chronoamperometry (SECM-DPSC). An homologous series four alcohols was considered: 1-tetradecanol (C14OH); 1-hexadecanol (C16OH); 1-octadecanol (C18OH); and 1-eicosanol (C20OH). For these measurements, a submarine ultramicroelectrode (UME) positioned in aqueous subphase Langmuir trough at typical distance 1−2 μm from W/A where monolayer assembled defined controllable surface pressure. SECM-DPSC approach involved electrogenerating an initial (forward) by diffusion-controlled oxidation Br- sulfuric acid solution. Electrogenerated subsequently collected reduction second (reverse) step. resulting current−time behavior provided information both tip−interfac...
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