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    Wetting kinetics of oil mixtures on fluorinated model cellulose surfaces

    Year: 2008

    Journal: Journal of Colloid and Interface Science, Volume 317, Issue 2, 15 January 2008, Pages 556-567, 20111221

    Authors: Christian Aulina, Andrei Shchukarevc, Josefina Lindqvista, Eva Malmströma, Lars Wågberga and Tom Lindström

    Organizations: Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH, The Royal Institute of Technology, SE-100 44 Stockholm, Sweden, BIM Kemi Sweden AB, Box 3102, SE-443 03 Stenkullen, Sweden, Department of Chemistry, Inorganic Chemistry, Umeå University, SE-901 87 Umeå, Sweden, STFI-Packforsk AB, Box 5604, SE-114 86 Stockholm, Sweden

    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 microfibrillated 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 (θe>90°) by castor oil.