ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS

The idea to study the electrochemistry of immobilized microparticles has been published by this author for the first time in 1989. In the last 32 years, this approach has been shown to be very successful not only for analytical characterization of solid materials, but also applicable to extract ther...

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Дата:2021
Автор: Scholz, Fritz
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Мова:Англійська
Опубліковано: V.I.Vernadsky Institute of General and Inorganic Chemistry 2021
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Назва журналу:Ukrainian Chemistry Journal
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Ukrainian Chemistry Journal
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author Scholz, Fritz
author_facet Scholz, Fritz
author_institution_txt_mv [ { "author": "Fritz Scholz", "institution": "Universität Greifswald, Institut für Biochemie" } ]
author_sort Scholz, Fritz
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datestamp_date 2026-07-22T08:23:47Z
description The idea to study the electrochemistry of immobilized microparticles has been published by this author for the first time in 1989. In the last 32 years, this approach has been shown to be very successful not only for analytical characterization of solid materials, but also applicable to extract thermodynamic and kinetic data, and even to determine the age of metal specimen. In 2000, it has been shown that the electrochemistry of immobilized microdroplets gives an elegant access to determine the Gibbs free energies of ion transfer between immiscible solvents. These measurements are performed with a standard 3-electrode potentiostate and can be used also for solvents, which cannot be used in experiments with the classical 4-electrode technique. The electrochemistry of microparticles and microdroplets share several common features with respect to the electrode mechanisms: in both cases three-phase electrodes are realized and ion and electron transfer proceed simultaneously. This talk reviews the activities of the speaker and his cooperation partners during the last 3 decades paying special attention to those results, which are of general interest.
doi_str_mv 10.33609/2708-129X.87.09.2021.55-60
first_indexed 2025-09-24T17:43:41Z
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fulltext 55 УДК 541.2+544.7 doi: 10.33609/2708-129X.87.09.2021.55-60 ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS F. Scholz1 1Universität Greifswald, Institut für Biochemie, Editor-in-Chief Journal of Solid State Electroche mistry (http://link.springer.com/journal/10008) and Editor-in-Chief ChemTexts – The Textbook Journal of Chemistry (http://link.springer.com/journal/40828) Editor of “Monographs in Electrochemistry” (https://www.springer.com/series/7386) Felix-Hausdorff-Straße 4, 17489 Greifswald, Germany e-mail: fscholz@uni-greifswald.de The idea to study the electrochemistry of immobilized microparticles has been published by this author for the first time in 1989. In the last 32 years, this approach has been shown to be very successful not only for analytical characterization of solid materials, but also ap- plicable to extract thermodynamic and kinetic data, and even to determine the age of metal specimen. In 2000, it has been shown that the electrochemistry of immobilized microdroplets gives an elegant access to determine the Gibbs free energies of ion transfer between immis- cible solvents. These measurements are performed with a standard 3-electrode potentiostate and can be used also for solvents, which cannot be used in experiments with the classical 4-electrode technique. The electrochemistry of microparticles and microdroplets share several common features with respect to the electrode mechanisms: in both cases three-phase electrodes are realized and ion and electron transfer proceed simultaneously. This talk reviews the activities of the speaker and his cooperation partners during the last 3 decades paying special attention to those results, which are of general interest. Key words: Electrochemistry of solids, three-phase electrodes, ion transfer between im- miscible solvents. ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS 56 ISSN 2708-129X. Укр. хім. журн., 2021 PHYSICAL CHEMISTRY Electrochemistry of immobilized micropartiles The electrochemical analysis and charac- terization of solid materials has always been a great challenge; however, it remained confined to electron conductors, mainly metals; it was and still is the domain of corrosion science. The last decades have also seen tremendous advances in the insertion electrochemistry of solid materials for batteries, almost exclusively studied with compact macroscopic solid elect rodes. Among the many attempts to expand the applicability of electrochemical measurements to solids, the early work of the Russian scien- tist A. I. Glazunov [1] is noteworthy. He called his technique electrography. A more detailed review of the history of solid state electroana lysis is available elsewhere [2]. Then, in 1989, Scholz, Nitschke and Henrion [3] have shown that metal particles can be transferred from a piece of metal to the surface of a graphite elec- trode by abrasion, i.e., by rubbing the graphite electrode on the surface of the metal, and soon after, the same authors have shown together with Damaschun that also mineral particles can be mechanically immobilized on an elec- trode for electrochemical studies [4]. The purely analytical applications, i.e., the quantitative analysis of alloys, minerals and synthetic solid materials will not be discussed here, as it is presented in detail in [2]. Instead, attention is drawn on the possibility to deter- mine the free energies of phase transition in case of some minerals, when the two phases can undergo reversible electrochemical reac- tions to the same dissolved species [5, 6]. Stud- ies of immobilized microparticles also allowed to understand the dependencies of formal po- tentials on structure parameters as ionic radii and ion potentials, in case of polycyanomet- alates [7, 8]. Another noteworthy topic is the electrochemical study of solid solutions [9–12]. Whereas X-ray diffraction of solid solutions requires a certain degree of crystallinity, the electrochemical approach also works in case of X-ray amorphous substances (see [10]). A number of theoretical papers have been published in which the mechanism of elec- trode reactions of immobilized microparticles is treated [13–17]. The electrochemical behavior of micropar- ticles has also been studied by in-situ combi- nation with X-ray diffraction [18], calorimetry [19, 20], diffuse reflection spectroscopy [21], and AFM [22–27]. These combinations al- lowed distinguishing the different electrode mechanisms. The studies of the electrochem- istry of microparticles led to the development of an approach for separating the Gibbs free energies of ion and electron transfer in case of reversible insertion electrochemical systems [28, 29]. Finally, it is noteworthy to mention that the electrochemistry of microparticles gives access to the age of metal objects, be they of gold, cop- per, bronze, or silver [30]. These electrochem- ical age determinations are of very special va lue because so far almost no direct methods of age determinations of metals and alloys were known. Electrochemistry of immobilized micro-droplets When a droplet of an immiscible solvent is immobilized on a suitable electrode, and when that droplet contains a redox active com- F. Scholz 57https://ucj.org.ua UCJ № 9 / Vol. 87 pounds, but no salt, an electron transfer be- tween the redox probe and the electrode ini tiates an ion transfer between the bulk electro- lyte solution and the droplet solvent. Similar to the insertion electrochemistry of micropar- ticles, the entire electrode is a three-phase electrode. When the formal potential of the redox probe in the droplet solvent is known, simple voltammetric measurements with the immobilized microdroplets allow determin- ing the Gibbs free energies of transfer of the ions, which are transferred between the sol- vents [2, 31–43]. This approach allowed to de- termine the Gibbs energies of ion transfer, i.e., the partition constants, of ions between water and n-octanol [32, 39], which is not possible when using the classical 4-electrode systems. It was possible to quantify the chiral recognition energies for ions using the solvent system wa- ter / chiral organic solvent [33, 42]. Amino acid anions, cations and also peptide ions have been studied in order to quantify the lipophilicity of these ions and their constituents [36, 38]. The new technique of using immobilized droplet electrodes considerably expanded the range of ions and of solvents for which Gibbs free ener- gies of ion transfer are accessible. Acknowledgement This research has been supported by Deutsche Forschungsgemeinschaft (DFG) for almost 30 years. ЕЛЕКТРОХІМІЯ ІММОБІЛІЗОВАНИХ МІКРО ЧАСТИНОК І МІКРОКРАПЕЛЬ: ПІДХІД ДО ФУНДАМЕНТАЛЬНИХ ДАНИХ ТВЕРДИХ МА- ТЕРІАЛІВ ТА ІОНІВ Ф. Щольц1 Університет Грайфсвальда, Інститут біо хімії, гол. редактор журналу «Електрохі- мія твердого тіла» (http://link.springer.com/ journal/10008) та гол. редактор журналу «Хрестоматійний підручник з хімії» (http:// link.springer.com/journal/40828), редактор журналу «Монографії з електро- хімії» (https://www.springer.com/series/7386) Фелікс-Хаусдорф-штрасе 4, 17489 Грайфс вальд, Німеччина Ідею вивчення електрохімії іммобілізо- ваних мікрочастинок було вперше опри- люднено автором роботи в 1989 році. Отже, за останні 32 роки цей підхід показав себе дуже успішним не тільки для аналітичних характеристик твердих матеріалів, а й для застосування при отриманні термодина- мічних і кінетичних даних і навіть визна- чення віку металевих зразків. У 2000  році було показано, що електрохімія іммобі- лізованих мікрокрапель дає надійний до- ступ для визначення вільних енергій Гіббса – переносу іонів між незмішуваними роз- чинниками. Ці виміри проводять із вико- ристанням стандартного триелектродного потенціостата і їх можна застосувати та- кож для розчинників, які не можливо ви- користовувати в експериментах із класич- ною чотириелектродною технікою. Елек- трохімія мікрочастинок і мікрокрапель має кілька спільних рис відносно електродних ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS 58 ISSN 2708-129X. Укр. хім. журн., 2021 PHYSICAL CHEMISTRY механізмів: в обох випадках реалізуються трифазні електроди і перенесення іонів та електронів відбувається водночас. У пові- домленні представлено результати діяль- ності спікера і його партнерів зі співпраці за останні 3 десятиліття, особливу увагу приділено результатам, які становлять спільний інтерес. Ключові слова: електрохімія твердих тіл, трифазні електроди, іонний перенос між незмішуваними розчинниками. REFERENCES 1. Scholz F. Glazunov’s electrography – the first electrochemical imaging and the first solid state electroanalysis. J Solid State Elec- trochem. 2021. https://doi.org/10.1007/s10008-021-04967-1 2. Scholz F., Schröder U., Gulaboski R., Doménech-Carbó A. Electrochemistry of immobilized particles and droplets, 2-nd edition, Berlin: Springer. 2015. 327. 3. Scholz F., Nitschke L., Henrion G. A. New Procedure for Fast Electrochemical Analy- sis of Solid Materials. Naturwissenschaften. 1989. 76:71. 4. Scholz F., Nitschke L., Henrion G., Dama schun A. A new technique to study the electrochemistry of minerals. Naturwissen- schaften. 1989. 76: 167–168. 5. Lange B., Scholz F., Bautsch H-J., Dama schun  F., Wappler G. Thermodynamics of the xanthoconite-proustite and pyrostilp- nite-pyrargyrite transitions as determined by abrasive stripping voltammetry. Phys. Chem. Minerals. 1993. 19: 486–491. 6. Meyer B., Scholz F. Redetermination of the transformation enthalpies of the xanthoco- nite-proustite, pyrostilpnite-pyrargyrite and trechmannite-smithite phase transition. Phys. Chem. Minerals. 1997. 24: 50–52. 7. Scholz F., Dostal A. The formal potentials of the solid metal hexacyanometalates. Angew. Chem. Int. Ed. Engl. 1995. 34: 2685–2687. 8. Bárcena Soto M., Scholz F. The thermody- namics of the insertion electrochemistry of solid metal hexacyanometallates. J. Electro- anal. Chem. 2002. 521: 183–189. 9. Meyer B., Zhang S., Scholz F. The quanti- tative analysis of mixed crystals CuSxSe1-x with abrasive stripping voltammetry and a redetermination of the solubility product of CuSe and the standard potential of the Cu/CuSe electrode. Fresenius‘ J. Anal. Chem. 1996. 356: 267–270. 10. Reddy S-J., Dostal A., Scholz F. Solid state electrochemical studies of mixed nickel- iron hexacyanoferrates with the help of abrasive stripping voltammetry. J. Electro- anal. Chem. 1996. 403: 209–212. 11. Schwudke D., Stößer R., Scholz F. Solid-state electrochemical, X-ray and spectro-scopic characterization of substitutional solid solu- tions of iron-copper hexacyano-ferrates. Electrochem. Commun. 2000. 2: 301–306. 12. Widmann A., Kahlert H., Petrovic-Prele vic  I., Wulff H, Yakhmi J. V., Bagkar N., Scholz F. The structure, insertion electro- chemistry and magnetic properties of a new type of substitutional solid solutions of copper, nickel and iron hexacyanoferrates/ hexacyanocobaltates. Inorg.Chem. 2002. 42: 5706–5715. 13. Lovrić M., Scholz F. A model for the propa gation of a redox reaction through micro- crystals. J. Solid State Electrochem. 1997. 1: 108–113. 14. Scholz F., Lovrić M., Stojek Z. The role of redox mixed phases {oxx(Cnred)1-x} in so F. Scholz 59https://ucj.org.ua UCJ № 9 / Vol. 87 lid state electrochemical reactions and the effect of miscibility gaps in voltammetry. J. Solid State Electrochem. 1997. 1: 134–142. 15. Lovrić M., Scholz F. A model for the coup led transport of ions and electrons in redox conductive microcrystals. J. Solid State Elec- trochem. 1999. 3: 172–175. 16. Lovrić M., Hermes M., Scholz F. Solid state electrochemical reactions in systems with miscibility gaps. J. Solid State Electrochem. 2000. 4: 394–401. 17. Schröder U., Oldham K. B., Myland J. C., Mahon P. J., Scholz F. Modelling of solid-state voltammetry of immobilized microcrystals assuming an initiation of the electrochemi- cal reaction at a three-phase junction. J. Solid State Electrochem. 2000. 4: 314–324. 18. Meyer B., Ziemer B., Scholz F. In situ X-ray diffraction study of the electrochemical re- duction of tetragonal lead oxide and orthor- hombic Pb(OH)Cl mechanically immobi- lized on a graphite electrode. J. Electroanal. Chem. 1995. 392: 79–83. 19. Bárcena Soto M., Kubsch G., Scholz F. Cyc lic voltammetry of immobilized micropar- ticles with in situ calorimetry, Part I: The thermistor electrode. J. Electroanal. Chem. 2002. 528: 18–26. 20. Bárcena Soto M., Scholz F. Cyclic voltam- metry of immobilized microparticles with in situ calorimetry, Part II: Application of a thermistor electrode for in situ calorimetric studies of the electrochemistry of solid me tal hexacyanoferrates. J. Electroanal. Chem. 2002. 528: 27–32. 21. Schröder U., Scholz F. Microscopic in situ diffuse reflectance spectro electrochemistry of solid state electrochemical reactions of particles immobilized on electrodes. J. Solid State Electrochem. 1997. 1: 62–67. 22. Hasse U., Scholz F. In situ atomic force microscopy of the reduction of lead oxide nanocrystals immobilized on an electrode surface. Electrochem. Commun. 2001. 3: 429–434. 23. Hasse U., Nießen J., Scholz F. Atomic force microscopy of the electrochemical reductive dissolution of sub-micrometersized crystals of goethite immobilized on a gold electrode. J. Electroanal. Chem. 2003. 556: 13–22. 24. Hasse U., Wagner K., Scholz F. Nucleation at three-phase junction lines: In situ atomic force microscopy of the electrochemical re- duction of sub-micrometer size silver and mercury (I) halide crystals immobilized on gold electrodes. J. Solid State Electrochem. 2004. 8: 842–853. 25. Hasse U., Scholz F. In situ AFM observation of the electrochemical reduction of a single silver sulphide crystal and the recrystalliza- tion of the resulting silver crystal. Electro- chem.Commun. 2005. 7: 173–176. 26. Hasse U., Scholz F. Atomic force micro- scopic study of the chemical oxidation of silver crystals immobilized on platinum and on quartz. Electrochem. Commun. 2006. 8: 1005–1010. 27. Hasse U., Scholz F. In situ AFM evidence of the involvement of an oversaturated solu- tion in the course of oxidation of silver nanocrystals to silver iodide crystals. Elec- trochem. Commun. 2004. 6: 409–412. 28. Cisternas R., Kahlert H., Wulff H., Scholz F. The electrode responses of a tungsten bronze electrode differ in potentiometry and voltammetry and give access to the in- dividual contributions of electron and pro- ton transfer. Electrochem. Commun. 2015. 56: 34–37. 29. Scholz F., Doménech-Carbó A. The thermo- dynamics of insertion electrochemical elec- trodes – a team play of electrons and ions ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS 60 ISSN 2708-129X. Укр. хім. журн., 2021 PHYSICAL CHEMISTRY across two separate interfaces (minireview). Angew. Chem. Int. Ed. 2019. 19: 3279–3284. 30. Doménech-Carbó A., Scholz F. Electro- chemical age determinations of metallic specimens — utilization of the corrosion clock.Acc. Chem. Res. 2019. 52:400−406. 31. Scholz F., Komorsky-Lovrić Š., Lovrić M. A new access to Gibbs free energies of transfer of ions across liquid-liquid interfaces and a new method to study electrochemical pro- cesses at well-defined three-phase junctions. Electrochem. Commun. 2000. 2: 112–118. 32. Gulaboski R., Mirčeski V., Scholz F. An electrochemical method for the determina- tion of the standard Gibbs energy of anion transfer between water and n-octanol. Elec- trochem. Commun. 2002. 4: 277–283. 33. Scholz F., Gulaboski R., Mirčeski V., Langer P. Quantification of the chiral recognition in electrochemically driven ion transfer across the interface water|chiral liquid. Electro- chem. Commun. 2002. 4: 659–662. 34. Mirčeski V., Gulaboski R., Scholz F. Deter- mination of the standard Gibbs energies of transfer of cations across the nitrobenzene/ water interface utilizing the reduction of iodine in an immobilized nitrobenzene droplet. Electrochem. Commun. 2002. 4: 814–818. 35. Komorsky-Lovrić Š., Riedl K., Gulaboski R, Mirčeski V., Scholz F. Determination of standard Gibbs energies of transfer of or- ganic anions across the water | nitrobenzene interface. Langmuir. 2002. 18: 8000–8005; Correction: 2003. 19: 3090. 36. Gulaboski R., Mirčeski V., Scholz F. Deter- mination of the standard Gibbs energies of transfer of cations and anions of amino acids and small peptides across the water | nitrobenzene interface. Amino Acids. 2003. 24: 149–154. 37. Gulaboski R., Riedl K., Scholz F. Standard Gibbs energies of transfer of halogenate and pseudohalogenate ions, halogen substituted acetates, and cycloalkylcarboxylate anions at the water| nitrobenzene interface. Phys. Chem. Chem. Phys. 2003. 5: 1284–1289. 38. Gulaboski R., Scholz F. The lipophilicity of peptide anions – an experimental data set for lipophilicity calculations. J. Phys. Chem. B. 2003. 107: 5650–5657. 39. Bouchard G., Galland A., Carrupt P-A., Gu- laboski R., Mirčeski V., Scholz F., Girault H. H. Standard partition coefficients of anionic drugs in the n‑octanol/water system determined by voltammetry at three-phase electrodes. Phys. Chem. Chem. Phys. 2003. 5:3748–3751. 40. Scholz F., Gulaboski R., Caban K. The de- termination of standard Gibbs energies of transfer of cations across the nitrobenzene | water interface with the help of a three- phase electrode. Electrochem. Commun. 2003. 5: 929–934. 41. Gulaboski R., Caban K., Stojek Z., Scholz F.The determination of the standard Gibbs energies of ion transfer between water and heavy water by using the three-phase elec- trode approach. Electrochem. Commun. 2004. 6: 215–218. 42. Scholz F., Gulaboski R. Gibbs energies of transfer of chiral anions across the interface water|chiral organic solvent determined with the help of three-phase electrodes. Fa raday Discussions. 2005. 129: 169–177. 43. Scholz F., Gulaboski R. Determination of Gibbs energies of ion transfer across water/ organic liquid interfaces with three-phase electrodes. Chem. Phys. Chem. 2005. 6: 16– 28. Стаття надійшла 20. 09. 2021.
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spelling oai:ojs2.1444248.nisspano.web.hosting-test.net:article-3542026-07-22T08:23:47Z ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS Scholz, Fritz Electrochemistry of solids, three-phase electrodes, ion transfer between immiscible solvents. The idea to study the electrochemistry of immobilized microparticles has been published by this author for the first time in 1989. In the last 32 years, this approach has been shown to be very successful not only for analytical characterization of solid materials, but also applicable to extract thermodynamic and kinetic data, and even to determine the age of metal specimen. In 2000, it has been shown that the electrochemistry of immobilized microdroplets gives an elegant access to determine the Gibbs free energies of ion transfer between immiscible solvents. These measurements are performed with a standard 3-electrode potentiostate and can be used also for solvents, which cannot be used in experiments with the classical 4-electrode technique. The electrochemistry of microparticles and microdroplets share several common features with respect to the electrode mechanisms: in both cases three-phase electrodes are realized and ion and electron transfer proceed simultaneously. This talk reviews the activities of the speaker and his cooperation partners during the last 3 decades paying special attention to those results, which are of general interest. V.I.Vernadsky Institute of General and Inorganic Chemistry 2021-10-25 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/354 10.33609/2708-129X.87.09.2021.55-60 Ukrainian Chemistry Journal; Vol. 87 No. 9 (2021): Ukrainian Chemistry Journal; 55-60 Украинский химический журнал; ##issue.vol## 87 ##issue.no## 9 (2021): Ukrainian Chemistry Journal; 55-60 Український хімічний журнал; Том 87 № 9 (2021): Український хімічний журнал; 55-60 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/354/189 Copyright (c) 2021 Fritz Scholz https://creativecommons.org/licenses/by-nc/4.0
spellingShingle Scholz, Fritz
ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title_full ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title_fullStr ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title_full_unstemmed ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title_short ELECTROCHEMISTRY OF IMMOBILIZED MICROPARTICLES AND MICRODROPLETE: ACCESS TO FUNDAMENTAL DATA OF SOLID MATERIALS AND IONS
title_sort electrochemistry of immobilized microparticles and microdroplete: access to fundamental data of solid materials and ions
topic_facet Electrochemistry of solids
three-phase electrodes
ion transfer between immiscible solvents.
url https://ucj.org.ua/index.php/journal/article/view/354
work_keys_str_mv AT scholzfritz electrochemistryofimmobilizedmicroparticlesandmicrodropleteaccesstofundamentaldataofsolidmaterialsandions