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Forces between carboxylic acid surfaces in divalent electrolyte solutions
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2000 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 229, 123-128 p.Article in journal (Refereed)
Abstract [en]

The behaviour of self-assembled monolayers of thiohexadecanoic acid adsorbed onto gold interacting in assymmetric 2:1 electrolytes has been studied with direct force measurements. The effects of two divalent cations (Mg2+ and Ca2+) were studied at concentrations ranging from 1 µM to 10 mM. As compared to interactions in the presence of Na+, the divalent ions adsorb strongly to the surfaces, with the effect of lowering the surface potential, and decreasing the double-layer repulsion. At concentrations above 10 µM, the Ca2+ ions were found to adsorb stronger than Mg2+, causing charge reversal at higher concentrations, and the net interactions at 10 mM were attractive over the measurable range.

Place, publisher, year, edition, pages
2000. Vol. 229, 123-128 p.
Keyword [en]
Self-assembled monolayers, surface forces, divalent ions, ion adsorption, charge reversal, carboxylic acids, colloidal stability
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26713OAI: oai:DiVA.org:ri-26713DiVA: diva2:1053716
Note
A1377Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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