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Equilibrium wetting studies of cationic surfactant adsorption on mica 1. Mono- and bilayer adsorption of CTAB
RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
1996 (Engelska)Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 181, s. 476-489Artikel i tidskrift (Refereegranskat)
Abstract [en]

The Wilhelmy plate method was used to study the wetting bahvior of CTAB solution on mica at concentrations from 10Ä-7Å M to 3*10Ä-4Å M. A freshly cleaved mica plate shows large amplitude oscillations of the dynamic advancing wetting tension and a jump-stick behavior of the meniscus due to surfactant adsorption at the three-phase contact line. Desorption in pure water is slow. During relaxation measurements, the wetting tension reaches its equilibrium value on a timescale of several hours. The equilibrium wetting tension decreases at low concentrations, reaches a minimum at 2.4*10Ä-5Å M corresponding to a contact angle of 73ÄoÅ, and then increases (solid/liquid bilayer adsorption) up to 3*10Ä-4Å M. The solid/liquid and solid/vapor adsorption isotherms were deduced from application of the Gibbs adsorption equation, surface force, and XPS data. The solid/liquid bilayer contains 1.4-1.6 surfactant cations per mica charge site, 0.7-1.0 in the inner layer and 0.6-0.75 in the outer layer. The areas per surfactant cation are 0.48-0.68 nmÄ2Å and 0.64-0.80 nmÄ2Å.

Ort, förlag, år, upplaga, sidor
1996. Vol. 181, s. 476-489
Nyckelord [en]
Equilibrium contact angle, Gibbs adsorption equation, hexadecyltrimethylammonium bromide(CTAB), mica, stick-jump spreading, surfactant adsorption, Wilhelmy plate method
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-26742OAI: oai:DiVA.org:ri-26742DiVA, id: diva2:1053745
Anmärkning
A1004Tillgänglig från: 2016-12-08 Skapad: 2016-12-08 Senast uppdaterad: 2020-12-01Bibliografiskt granskad

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