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Authors
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Drechsler, A. ; Grundke, K.
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Title
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The influence of electrolyte ions on the interaction forces between polystyrene surfaces
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Date
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22.09.2005
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Number
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12517
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Abstract
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The forces between a flat polystyrene film and a polystyrene sphere have been measured in water and solutions of KCl and KOH. All forcedistance curves show at distances >550 nm an electrical double-layer repulsion whose range and strength depend on the electrolyte concentration. The electrical double-layer potential at the polystyrene surface coincides with its zeta potential. An attractive force of variable range and strength dominates at shorter distances in water, KCl concentrations up to 10-2 M and a 10-5 M KOH solution. We attribute it to the existence of air nanobubbles on the polymer surface. It is not affected by the KCl concentration. In KOH concentrations =10-4 M, the attraction disappears. Instead, an additional soft steric repulsion occurs at distances <520 nm.
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Publisher
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Colloids and Surfaces A: Physicochemical and Engineering Aspects
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Wikidata
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Citation
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Colloids and Surfaces A: Physicochemical and Engineering Aspects 264 (2005) 157-165
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DOI
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https://doi.org/10.1016/j.colsurfa.2005.05.001
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Tags
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PG_SurfaceForce
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