- Doctoral Thesis
Rights / licenseIn Copyright - Non-Commercial Use Permitted
Electrical double layers, comprising of a surface charge and excess ions in solution, are of critical importance in applications such as colloid science, energy storage devices and water desalination. When two charged surfaces and their accompanying double layers approach each other, the double layers first begin to overlap and finally collapse under confinement. In nanofluidic devices or nanopores where double layers are in such a confined state, transport phenomena and physicochemical reactions depend on the composition and properties of the collapsed electrical double layer. The classical DLVO theory fails to predict the interaction forces accurately at nanometer separations or high ionic concentrations since it disregards, among other things, confinement induced effects such as ion dehydration. This work aims to address these open questions, namely the interaction between surfaces at nanometer separations and the changes in the interfacial adhesion due to the presence of counterions. The collective transitions between structural elements in nanometer-thick monovalent aqueous electrolytic films as well as interfacial adhesion were studied via direct force measurements between atomically smooth mica surfaces using the enhanced sensitivity of film thickness measurement. Changing concentration or pH provides the means to shift chemical potentials and interfacial populations, and therefore also to shift the relative stability of structural elements and gain valuable insights into the structural diversity at the interface. Show more
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ContributorsExaminer: Heuberger, Manfred P.
Examiner: Espinosa-Marzal, Rosa M.
Examiner: Christenson, Hugo
Examiner: Spencer, Nicolas D.
Examiner: Fiebig, Manfred
Subjecthydrated ions; nano-confinement; Electrical double layer
Organisational unit02646 - Institut für Polymere / Institute of Polymers
02160 - Dep. Materialwissenschaft / Dep. of Materials
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