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The influence of mixed cationic-anionic surfactants on the three-phase contact parameters in silica-solution systems
Vise andre og tillknytning
2011 (engelsk)Inngår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 373, s. 145-151Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]

The formation of thin wetting films on silica surface from aqueous solution of (a) tetradecyltrimetilammonium bromide (C14TAB) and (b) surfactant mixture of the cationic C14TAB with the anionic sodium alkyl- (straight chain C12-, C14- and C16-) sulfonates, was studied using the microscopic thin wetting film method developed by Platikanov. Film lifetimes, three-phase contact (TPC) expansion rates, receding contact angles and surface tension were measured. It was found that the mixed surfactants caused lower contact angles, lower rates of the thin aqueous film rupture and longer film lifetimes, as compared to the pure C14TAB. This behavior was explained by the strong initial adsorption of interfacial complexes from the mixed surfactant system at the air/solution interface, followed by adsorption at the silica interface. The formation of the interfacial complexes at the air/solution interface was proved by means of the surface tension data. It was also shown, that the chain length compatibility between the anionic and cationic surfactants controls the strength of the interfacial complex and causes synergistic lowering in the surface tension. The film rupture mechanism was explained by the heterocoagulation mechanism between the positively charged air/solution interface and the solution/silica interface, which remained negatively charged.

sted, utgiver, år, opplag, sider
2011. Vol. 373, s. 145-151
Emneord [en]
Mixed surfactant systems, Thin wetting films, Three-phase contact
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-26381DOI: 10.1016/j.colsurfa.2010.10.040OAI: oai:DiVA.org:ri-26381DiVA, id: diva2:1053383
Merknad
A3523Tilgjengelig fra: 2016-12-08 Laget: 2016-12-08 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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