The punctured droplet electrode – A new three-phase electrode with well defined geometry |
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| Affiliation: | 1. Department of Chemistry, Warsaw University, ul. Pasteura 1, PL-02-093 Warsaw, Poland;2. Institut für Chemie und Biochemie, Universität Greifswald, Soldmannstrasse 23, D-17489 Greifswald, Germany;1. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany;2. Geologie, TU Bergakademie Freiberg, B.-von-Cotta Str. 2, 09599 Freiberg, Germany;3. Tajik Technical University, Academics Rajabovs Str. 10A, Dushanbe, 734000, Tajikistan;4. Tajik Academy of Sciences, 267 Ainy Str., Dushanbe, 734063, Tajikistan;5. Geophysik, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany;1. Freie Universität Berlin, Institut für Geologische Wissenschaften, Malteserstrasse 74-100, 12249 Berlin, Germany;2. Universität Bayreuth, Bayerisches Geoinstitut, 95440 Bayreuth, Germany;1. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA;3. Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China;1. Center of Drug Discovery, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, PR China;2. Structural Biology Center, Wenzhou Medical University, Wenzhou 325027, PR China;3. Division of Antitumor Pharmacology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, PR China;4. Department of Biochemistry and Molecular Biology, Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, PR China;5. Jiangsu Key Laboratory of Drug Discovery for Metabolic Disease, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China;1. Geological Institute, Russian Academy of Sciences, Moscow, Russia;2. Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia;3. Department of Geological Sciences, University of Florida, Gainesville, FL, USA;4. Institute of Geology, Ufa Scientific Center, Russian Academy of Sciences, Ufa, 450000 Russia |
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| Abstract: | A new three-phase electrode allows detailed studies on well-defined three-phase junctions. It consists of a nitrobenzene drop of well controlled size. The drop is dispensed from a capillary and is punctured with a microcylinder electrode. The organic liquid contains an electroactive compound (decamethylferrocene) and, importantly, no supporting electrolyte. The aqueous phase may contain various salts. Well-defined and reproducible linear-scan and square-wave voltammograms and chronoamperograms of oxidation of decamethylferrocene were obtained. The dependence of the formal potential determined from the square-wave voltammograms of decamethylferrocene versus the standard potential of transfer of anions present in the aqueous phase was almost perfectly linear. The developed approach allows the formation of two or more three-phase boundaries within one small drop. Since the drop is well exposed, this electrode geometry also gives a potential possibility of optical/spectrophotometric inspection of the reaction products in the organic phase and of examination of the reaction-layer growth. |
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