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Forces and friction between hydrophilic and hydrophobic surfaces: Influence of oleate species
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2007 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 313, no 2, 735-746 p.Article in journal (Refereed)
Abstract [en]

The atomic force microscope has been used to investigate normal surface forces and lateral friction forces at different concentrations of sodium oleate, a frequently used fatty acid in the deinking process. The measurements have been performed using the colloidal probe technique with bead materials consisting of cellulose and silica. Cellulose was used together with a printing ink alkyd resin and mica, whereas silica was used with a hydrophobised silica wafer. The cellulose - alkyd resin system showed stronger double layer repulsion and the friction was reduced with increasing surfactant concentration. The adhesive interaction disappeared immediately on addition of sodium oleate. The normal surface forces for cellulose-mica indicated no apparent adsorption of the sodium oleate however, the friction coefficient increased on addition of sodium oleate, which we ascribe to some limited adsorption increasing the effective surface roughness. The silica – hydrophobic silica system showed a completely different surface force behaviour at the different concentrations. An attractive hydrophobic interaction was evident since the surfaces jumped into adhesive contact at a longer distance than the van der Waals forces would predict. The strong adhesion was reflected in the friction forces as a nonlinear relationship between load and friction and a large friction response at zero applied load. Indirect evidence of adsorption to the hydrophilic silica surface was also observed in this case, and QCM studies were performed to confirm the adsorption of material to both surfaces

Place, publisher, year, edition, pages
2007. Vol. 313, no 2, 735-746 p.
Keyword [en]
Surface force, friction, nanotribology, deinking, fatty acid, sodium oleate, adsorption, AFM, colloidal probe, cellulose
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26669OAI: oai:DiVA.org:ri-26669DiVA: diva2:1053672
Note
A1794Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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