کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
597430 1454069 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Frequency changes observed with the EQCM resulting from hydrophilic/hydrophobic transitions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Frequency changes observed with the EQCM resulting from hydrophilic/hydrophobic transitions
چکیده انگلیسی

The processes responsible for the altered frequency response of the EQCM when the electrode surface changes from a hydrophilic to a hydrophobic condition have been investigated using silver electrodes in ethyl xanthate solution. The frequency accurately tracks the voltammetric charge when silver ethyl xanthate is formed, but moves in the opposite direction when xanthate is chemisorbed; chemisorption is known to result in the surface becoming hydrophobic. The characteristics of the EQCM in a xanthate solution that had been completely degassed were the same as those in one in equilibrium with nitrogen at atmospheric pressure. This is in agreement with slippage occurring at the hydrophobic quartz crystal/electrolyte interface as a result of a change in water structure but inconsistent with the formation of nanobubbles. Similar voltammograms were observed for specular reflective silver surfaces to those for electrodeposited ones, but the alteration in frequency response during change in wettability was much greater. This is also explained in terms of water structure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 302, Issues 1–3, 20 July 2007, Pages 488–493
نویسندگان
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