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Extracting local surface charges and charge regulation behavior from atomic force microscopy measurements at heterogeneous solid-electrolyte interfaces

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Extracting local surface charges and charge regulation behavior from atomic force microscopy measurements at heterogeneous solid-electrolyte interfaces

Content Provider	Royal Society of Chemistry (RSC)
Author	Ebeling, Daniel Ende, Dirk den Zhao, Cunlu etanu, Igor Mugele, Frieder
Copyright Year	2015
Abstract	We present a method to determine the local surface charge of solid–liquid interfaces from Atomic Force Microscopy (AFM) measurements that takes into account shifts of the adsorption/desorption equilibria of protons and ions as the cantilever tip approaches the sample. We recorded AFM force distance curves in dynamic mode with sharp tips on heterogeneous silica surfaces partially covered by gibbsite nano-particles immersed in an aqueous electrolyte with variable concentrations of dissolved NaCl and KCl at pH 5.8. Forces are analyzed in the framework of Derjaguin–Landau–Verwey–Overbeek (DLVO) theory in combination with a charge regulation boundary that describes adsorption and desorption reactions of protons and ions. A systematic method to extract the equilibrium constants of these reactions by simultaneous least-squared fitting to experimental data for various salt concentrations is developed and is shown to yield highly consistent results for silica-electrolyte interfaces. For gibbsite-electrolyte interfaces, the surface charge can be determined, yet, an unambiguous identification of the relevant surface speciation reactions is not possible, presumably due to a combination of intrinsic chemical complexity and heterogeneity of the nano-particle surfaces.
Starting Page	16298
Ending Page	16311
Page Count	14
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	39
Journal	Nanoscale
DOI	10.1039/c5nr05261k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Landau Nanoparticle Derjaguin Atomic Force Microscopy Cantilever Verwey DLVO theory Silicon dioxide Atomic-force microscopy Adsorption Electrolyte Overbeek PH Gibbsite Speciation
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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