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Dynamic wetting of silica by aqueous triblock copolymer solutions -Low concentrations
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 15, 4916-4921 p.Article in journal (Refereed)
Abstract [en]

We report on the wetting of silica by aqueous solutions of triblock copoly(ethylene oxide-tetrahydrofuran-ethylene oxide), PEO-PTHF-PEO. The wetting behaviour was measured by means of a Wilhelmy force balance and by direct images of the contact angle. The results show that the three-phase contact line (tcl) advances in jumps over the surface when this is immersed with constant rate into copolymer solutions. This stick-slip behaviour was studied with respect to both the concentration of copolymers in the solution and the immersion rate of the silica plate into the solution. The wetting results are compared with adsorption data obtained by ellipsometry and dynamic surface tension measurements. It is clear that the stick-slip spreading behaviour results from the same basic mechanisms as have previously been proposed to be responsible for the stick-slip spreading observed for short chain cationic surfactants. The pinning of the contact line is due to the formation (through adsorption) of an autophobic copolymer layer at the solid-vapour interface. At low copolymer concentrations, transport of copolymers to the solid-vapour interface seems to occur mainly through surface diffusion from the liquid-vapour interface to the three-phase contact line. De-pinning and slip occurs when the dynamic contact angle has increased above a critical value, which exceeds that stipulated by the Young's equation in the presence of the autophobic layer at the solid-vapour interface.

Place, publisher, year, edition, pages
1999. Vol. 15, 4916-4921 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27237OAI: oai:DiVA.org:ri-27237DiVA: diva2:1054241
Note
A1256Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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