Thermodynamic analysis of the cation binding to a phosphatidylcholine monolayer at a polarised interface between two immiscible electrolyte solutions |
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| Institution: | 1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic;2. Laboratoire d’Electrochimie Physique et Analytique, Institut de Chimie Moléculaire et Biologique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;1. Department of Chemical Engineering and Center for Chemical Technology, Hankyong National University, Anseong-si, Gyeonggi-do 456-749, Korea;2. Department of Electrical, Electronic, and Control Engineering, Hankyong National University, Anseong-si, Gyeonggi-do 456-749, Korea;3. Department of Materials Chemistry and Engineering, Konkuk University, Seoul 143-701, Korea;4. Department of Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea;5. Department of Physics, Sunchon National University, Sunchon-si, Chunam-do 540-742, Korea;1. Analytical Chemistry—Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, D-44780 Bochum, Germany;2. Laboratory of Industrial Chemistry, Ruhr-Universität Bochum, Universitätsstr. 150, D-44780 Bochum, Germany;1. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China;2. Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan 250014, PR China;1. Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000 Ghent, Belgium;2. Department of Materials and Chemistry, Research group of Electrochemical and Surface Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;3. Department of Organic and Macromolecular Chemistry, Polymer Chemistry Research Group, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium;4. Department of Materials and Science Engineering, Ghent University, Technologiepark 903, 9052 Zwijnaarde, Ghent, Belgium |
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| Abstract: | Thermodynamic analysis of the polarised interface between two immiscible electrolyte solutions (ITIES) was outlined, which accounts for the adsorption of phosphatidylcholine (PC) both as a zwitterion and a cation formed by the aqueous cation association with the zwitterionic PC form, as well as for the aqueous cation transfer facilitated by PC leading to its depletion from the interface. Electrocapillary equation was derived clarifying the physical significance of the surface charge density; the differential capacity and the PC surface excess concentration. The potential dependence of the interfacial tension calculated using the Damaskin’s adsorption model of a compound adsorbed in two different forms was found to agree well with that measured for the polarised water|1,2-dichloroethane interface in the presence of dl-α-dipalmitoylphosphatidylcholine. Experimentally observed effect of the nature of the aqueous cation on the interfacial tension was ascribed to the difference in the PC association constant. |
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