Wetting kinetics of oil mixtures on fluorinated model cellulose surfaces
2008 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 317, 556-567 p.Article in journal (Refereed) Published
The wetting of two different model cellulose surfaces has been studied; a regenerated cellulose (RG) surface prepared by spin-coating, and a novel multilayer film of poly(ethyleneimine) and a carboxymethylated microtibrillated cellulose (MFC). The cellulose films were characterized in detail using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). AFM indicates smooth and continuous films on a nanometer scale and the RMS roughness of the RG cellulose and MFC surfaces was determined to be 3 and 6 nm, respectively. The cellulose films were modified by coating with various amounts of an anionic fluorosurfactant, perfluorooctadecanoic acid, or covalently modified with pentadecafluorooctanyl chloride. The fluorinated cellulose films were used to follow the spreading mechanisms of three different oil mixtures. The viscosity and surface tension of the oils were found to be essential parameters governing the spreading kinetics on these surfaces. XPS and dispersive surface energy measurements were made on the cellulose films coated with perfluorooctadecanoic acid. A strong correlation was found between the surface concentration of fluorine, the dispersive surface energy and the contact angle of castor oil on the surface. A dispersive surface energy less than 18 mN/m was required in order for the cellulose surface to be non-wetting (theta(e) > 90 degrees) by castor oil.
Place, publisher, year, edition, pages
2008. Vol. 317, 556-567 p.
MFC; adsorption; fluorosurfactant; XPS; AFM; multilayer; wetting; oil resistance; cellulose surface; contact angle
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-7850DOI: 10.1016/j.jcis.2007.09.096ISI: 000251556100023ScopusID: 2-s2.0-36148995487OAI: oai:DiVA.org:kth-7850DiVA: diva2:12994
QC 201006232007-12-182007-12-182010-11-03Bibliographically approved