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Friction force measurements relevant to de-inking by means of atomic force microscope
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
2005 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 291, no 2, 361-368 p.Article in journal (Refereed) Published
Abstract [en]

In the pulping step of the de-inking process, the ink detaches from the fibers due to shear and physical chemical interaction. In order to get a better understanding of the forces involved between cellulose and ink, the atomic force microscope and the colloidal probe technique have been used in the presence of a model chemical dispersant (hexa-ethyleneglycol mono n-dodecyl ether, C 12E6). A cellulose bead was used as the colloidal probe and three different lower surfaces have been used, an alkyd resin, mica and a cellulose sphere. The normal and lateral forces have been measured at a range of nonionic concentrations. It was found that the lateral sliding friction forces deceased with increasing surfactant concentration for both the alkyd resin and mica while no differences were observed for the cellulose surface. In addition, only a very small change in normal force could be detected for the alkyd surface as the concentration changed.

Place, publisher, year, edition, pages
2005. Vol. 291, no 2, 361-368 p.
Keyword [en]
Atomic force microscopy (AFM), C12E6, Colloidal probe, De-inking, Nonionic surfactant, Sliding friction
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-9039DOI: 10.1016/j.jcis.2005.05.040ISI: 000232815500007Scopus ID: 2-s2.0-26444497105OAI: oai:DiVA.org:kth-9039DiVA: diva2:14580
Note
QC 20100915Available from: 2006-01-27 Created: 2006-01-27 Last updated: 2017-12-14Bibliographically 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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