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Forces between carboxylic acid surfaces in divalent electrolyte solutions
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2000 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 229, s. 123-128Artikel i tidskrift (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
2000. Vol. 229, s. 123-128
Nyckelord [en]
Self-assembled monolayers, surface forces, divalent ions, ion adsorption, charge reversal, carboxylic acids, colloidal stability
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-26713OAI: oai:DiVA.org:ri-26713DiVA, id: diva2:1053716
Anmärkning
A1377Tillgänglig från: 2016-12-08 Skapad: 2016-12-08 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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