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Interactions between Crossed Hair Fibers at the Nanoscale
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
2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 24, 18909-18915 p.Article in journal (Refereed) Published
Abstract [en]

The atomic force microscope fiber probe is used to directly measure the forces and friction between two human hairs under various conditions. It is shown that the forces between the hair fibers in solution can be well explained by a DLVO interaction and that cationic surfactant modifies the interactions in a manner entirely consistent with current views of adsorption behavior. A Coulombic attraction occurs between the crossed hair fibers in air due to the heterogeneity of the surface, and at shorter separations a clear dispersion interaction is observed. Exposure of the hair to a bleaching solution leads to the removal of the adhesion and solely a double-layer interaction. Two crossed hair fibers obey Amontons' classic law of friction, with a linear relation between applied load and frictional force, allowing the determination of a friction coefficient; positively charged surfactant adsorption is shown to reduce the friction coefficient between the fibers in a manner consistent with boundary lubrication by a palisade layer.

Place, publisher, year, edition, pages
2010. Vol. 26, no 24, 18909-18915 p.
Keyword [en]
atomic-force microscopy, electrical double-layer, hydrophobic surfaces, micellar-solutions, colloidal forces, spring constants, silica surfaces, keratin fibers, friction, adhesion
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-28584DOI: 10.1021/la103001sISI: 000285217700046Scopus ID: 2-s2.0-78650212978OAI: oai:DiVA.org:kth-28584DiVA: diva2:388283
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note
QC 20110117Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Adhesion and Nanotribology of Biofibres
Open this publication in new window or tab >>Adhesion and Nanotribology of Biofibres
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The fibre probe atomic force microscope is developed, which allows direct measurement of force and friction between single fibres at the nanoscale under various conditions. In this work, polyester and human hair fibres were used as being representative of synthetic and animal fibre. It is shown that the forces between hair fibres and polyester fibres in solution can be well explained by a DLVO interaction and that cationic surfactants modify the interactions in a manner consistent with current views of adsorption behavior. Friction coefficients are obtained from a friction-load relationship for the fibres using Amontons’ law. The variation of friction coefficient of the synthetic fibres with surfactant concentration is well correlated with surfactant adsorption behavior. However the frictional behavior of hair is somewhat unexpected, showing a minimum in frictioncoefficient below the cmc which may be related to surfactant – protein interaction at the surface.

An analysis method to distinguish fibre friction in different sliding directions is established to allow discussion of directional friction effects. In contrast to macroscopic measurements, the effect is found to be small for native hair but significant for bleached hair at most of the sliding angles. This mechanism is largely correlated with the higher surface roughness of bleached hair. In addition the friction coefficient of bleached hair is shown to change periodically with the sliding angle, associated with cuticle – cuticle interlocking.

A monolayer consisting of 18-methyleicosane thiol (18-MET) is fabricated as a model surface for hair. Friction and force measurements are performed and the results compared with those of the straight chain analogue eicosane thiol (ET) monolayer to discriminate the effect of the branched methyl on 18-MET. The 18-MET monolayer shows a slightly higher surface energy due to the terminal gauche defect of the film, and this can be correlated with a loss of adhesion in MSUD (maple syrup urine disease) hair where the methyl branched surface lipids are largely replaced by the straight chain analogue. While the current view on the function of methyl branched lipids is to reduce the friction of hair, our results shows lower lubricating ability for 18-MET monolayer than that of ET monolayer and the effect may be associated with the surface roughness and film density. It is also shown that the presence of the methyl branch alters surfactant adsorption behavior to the surfaces which has an impact on boundary lubrication.

The adhesion mechanisms of the components in gastroliths, a calcium carbonatedbio material from a red claw lobster, are investigated by means of colloid probe AFM. A technique employed to extract the gastrolith and thus vary the composition, enabled a systematic study on the contribution of the various components; calcium carbonate, chitin and gastrolith proteins, to the detachment behavior and adhesion energy. Sequential detachment and large adhesion energies where observed between native gastrolith substrates and colloidal probes consisting of microparticles of heavily demineralized gastrolith and calcium carbonate. The sequential detachment behavior was absent when the soluble proteins have been removed from gastrolith substrates and the adhesive energy is reduced by more than two orders of magnitude. The sacrificial bonds that provide the large adhesion energies are probably related to multifunctional gastrolith proteins that are able to bind to both chitin and calcium carbonate.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 64 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:3
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-91312 (URN)978-91-7501-249-0 (ISBN)
Public defence
2012-03-30, E2, Lindstedtsvägen , KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120313Available from: 2012-03-13 Created: 2012-03-13 Last updated: 2012-03-13Bibliographically approved

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