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Forces and Friction Between Hydrophilic and Hydrophobic Surfaces: Influence of Oleate Species
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.ORCID iD: 0000-0002-8935-8070
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) Published
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 hydrophobized 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 behavior 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
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-9040DOI: 10.1016/j.jcis.2007.05.016ISI: 000248766000043Scopus ID: 2-s2.0-34547152071OAI: oai:DiVA.org:kth-9040DiVA: diva2:14581
Note
QC 20100915. Uppdaterad från Submitted till Published (20100915)Available from: 2006-01-27 Created: 2006-01-27 Last updated: 2010-09-15Bibliographically approved
In thesis
1. Studies of surfactant behaviour and model surfaces relevant to flotation deinking
Open this publication in new window or tab >>Studies of surfactant behaviour and model surfaces relevant to flotation deinking
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The objective of this work was to investigate the behaviour of some model surfactants used in the deinking process, namely, sodium oleate and two ethoxylated nonionic surfactants (C12E6 and C14E6) as well as to investigate the suitability of various model substrates for mimicking interactions in technical systems. The influence of the adsorption to the air � water interface has been measured by means of equilibrium and dynamic surface tension measurements, as well as foaming experiments. It was found that the solution pH and temperature influenced the dynamic and equilibrium surface tensions and the value of the cmc. Equilibrium surface tension measurements were also performed with mixtures of sodium oleate and nonionic surfactants and a strong synergistic effect was obtained, which means that a greater surface tension reduction can be obtained at lower surfactant concentrations. The foaming experiments, carried out with a Foam Scan Apparatus, showed an approximately constant total foam volume for both the pure surfactant systems and for the mixtures. In addition, the foam was slightly more stable for the mixtures than for the pure components.

Friction and surface forces between solid surfaces in liquid were studied using the atomic force microscope (AFM) from which inferences about the adsorption to these interfaces could be drawn. The AFM measurements were performed with the colloidal probe technique using cellulose as colloidal probe and an alkyd resin as a model ink surface. Mica and silica were both used as models for hydrophilic surfaces. Adsorption was observed on the alkyd resin, both with sodium oleate and with C12E6. The adsorption was registered both as a change in normal surface force interaction and as a strong reduction in friction force and friction coefficient at increasing surfactant concentration. The magnitude of the friction force was observed to be dependent on the adhesion and varied monotonically with the surface roughness. Measurements of adhesion and friction forces in air were performed, and the same conclusions about the effect of roughness were drawn. Finally the friction force behaviour appears to be similar if the adhesion is caused by a vapour bridge in liquid, or by a liquid bridge in air, where the formation of a capillary bridge in air is strongly dependent on the relative humidity.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 68 p.
Series
Trita-YTK, ISSN 1650-0490 ; 0601
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-602 (URN)91-7178-259-1 (ISBN)
Public defence
2006-02-10, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100923Available from: 2006-01-27 Created: 2006-01-27 Last updated: 2010-09-23Bibliographically approved

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