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  • 1. Boschkova, K
    et al.
    Kronberg, B
    YKI – Ytkemiska institutet.
    Rutland, M
    YKI – Ytkemiska institutet.
    Imae, T
    Study of thin surfactant films under shear using the tribological surface force apparatus2001Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 34, s. 815-822Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Static and dynamic behaviour of thin surfactant films in aqueous solution of hexadecyltrimethylammonium salicylate (C16TASal) were investigated using the tribological surface force apparatus. Normal force measurements show that 0.15 mM C16TASal builds up an innermost film of approximately 8¯11 Å thickness at each mica surface, indicating that the surfactant adsorbs in a flat conformation. Furthermore, the height of the force barrier at approximately 60Å is low (ca 2 mN/m) indicating that the second adsorbed layer is easily pushed out. Addition of salicylate salt to 0.15 mM C16TASal give rise to a more close packed structure, with a total thickness of 62¯65 Å, indicative of a micellar or bilayer arrangement at the surfaces. Furthermore, the frequency dependence of the shear modulus was investigated both at close separation at the innermost force barrier and at larger separations (up to 300¯400 Å). The visco-elastic measurements show that the elasticity modulus, G', dominates over the loss modulus, G'', for all studied cases, indicative of a more solid-like than liquid-like film. Finally, it is shown that shear at high contact pressures induces new aggregate structures at the surface

  • 2.
    Duvefelt, K.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Olofsson, U.
    KTH Royal Institute of Technology, Sweden.
    Johannesson, C. M.
    KTH Royal Institute of Technology, Sweden.
    Skedung, Lisa
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Model for contact between finger and sinusoidal plane to evaluate adhesion and deformation component of friction2014Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, s. 389-394Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the main parameters affecting finger friction, friction-induced vibrations in the finger, and consequently tactility is surface topography. Recently Skedung et al. performed finger frictionmeasurements on fine controlled surfaces. These surfaces were sinusoidal with wavelengths from 0.27 to 8.8 μm and amplitudes from 0.007 to 6 μm. Building on those tests an analytical model for the contact was developed to explain the differences in friction coefficient. The contact was modelled as trapezoids in a circular pattern pressed against a sinusoidal plane. Results showed that the calculated contact area and therefore friction coefficient corresponded well with the measurements. This model can be used to see how the different surface parameters influence friction.

  • 3.
    Duvefelt, Kenneth
    et al.
    KTH Royal Institute of Technology, Sweden.
    Olofsson, Ulf
    KTH Royal Institute of Technology, Sweden.
    Johannesson, Carl Michael
    KTH Royal Institute of Technology, Sweden.
    Skedung, Lisa
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Model for contact between finger and sinusoidal plane to evaluate adhesion and deformation component of friction2016Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 96, s. 389-394Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the main parameters affecting finger friction, friction-induced vibrations in the finger, and consequently tactility is surface topography. Recently Skedung et al. performed finger friction measurements on fine controlled surfaces. These surfaces were sinusoidal with wavelengths from 0.27 to 8.8 μm and amplitudes from 0.007 to 6 μm. Building on those tests an analytical model for the contact was developed to explain the differences in friction coefficient. The contact was modelled as trapezoids in a circular pattern pressed against a sinusoidal plane. Results showed that the calculated contact area and therefore friction coefficient corresponded well with the measurements. This model can be used to see how the different surface parameters influence friction.

  • 4.
    Ghasemi, Rohollah
    et al.
    Jönköping University, Sweden.
    Elmquist, L.
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST AB.
    Ghassemali, E.
    Jönköping University, Sweden.
    Salomonsson, K.
    Jönköping University, Sweden.
    Jarfors, A. E. W.
    Jönköping University, Sweden.
    Abrasion resistance of lamellar graphite iron: Interaction between microstructure and abrasive particles2018Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 120, s. 465-475Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study focuses on abrasion resistance of Lamellar Graphite Iron (LGI) using microscratch test under constant and progressive load conditions. The interactions between a semi-spherical abrasive particle, cast iron matrix and graphite lamellas were physically simulated using a sphero-conical indenter. The produced scratches were analysed using LOM and SEM to scrutinise the effect of normal load on resulting scratch depth, width, frictional force, friction coefficient and deformation mechanism of matrix during scratching. Results showed a significant matrix deformation, and change both in frictional force and friction coefficient by increase of scratch load. Furthermore, it was shown how abrasive particles might produce deep scratches with severe matrix deformation which could result in graphite lamella's coverage and thereby deteriorate LGI's abrasion resistance.

  • 5.
    Macakova, Lubica
    et al.
    YKI – Ytkemiska institutet.
    Yakubov, Gleb E
    Plunkett, Mark A
    Stokes, Jason R
    Influence of ionic strength on the tribological properties of pre-adsorbed salivary films2011Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 44, nr 9, s. 956-962Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We have studied tribological properties of pre-adsorbed salivary films formed in vitro on compliant hydrophobic surfaces. The adsorbed salivary film significantly decreases boundary friction under physiological ionic strength, which is related to a hydrophilic character of the adsorbed film and its structure. Decrease in the ionic strength below physiological conditions affects film's structure, but it does not significantly affect boundary lubrication at low loads. Applications of high loads led to a gradual loss of lubrication due to shear-induced wear of the films. The wear became more extensive as the ionic strength of the solvent was lowered below physiological conditions.

  • 6.
    Persson, K
    et al.
    YKI – Ytkemiska institutet.
    Gåhlin, R
    Tribological performance of a DLC coating in combination with water-based lubricants2003Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 36, nr 11, s. 851-855Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The tribological behaviour in water-based environments has been studied for a tungsten carbide-doped DLC coating (WC/C) deposited by physical vapour deposition (PVD) on bearing steel. Several tribological test equipments have been used to characterise the wear rate, coefficient of friction and resistance to seizure of the coated system, in comparison with uncoated bearing steel surfaces. It was observed that the wear was decreased and the coefficient of friction reduced in pin-on-disc measurements for poor lubricants. Further, the resistance to seizure in the four-ball method was improved by a factor of approximately three. Results from Reichert measurements showed a decreased wear rate and also a very pronounced running-in behaviour of the coating for some water-based lubricants. It has been shown that the performance of tribological systems with water-based lubricants can be significantly improved with this type of DLC coating

  • 7.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Danerlov, Katrin
    Olofsson, Ulf
    Johannesson, Carl Michael
    Aikala, Maiju
    Kettle, John
    Tactile perception: Finger friction, surface roughness and perceived coarseness2011Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 44, nr 5, s. 505-512Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Finger friction measurements performed on a series of printing papers are evaluated to determine representativeness of a single individual. Results show occasionally large variations in friction coefficients. Noteworthy though is that the trends in friction coefficients are the same, where coated (smoother) papers display higher friction coefficients than uncoated (rougher) papers. The present study also examined the relationship between the measured friction coefficients and surface roughness to the perceived coarseness of the papers. It was found that both roughness and finger friction can be related to perceived coarseness, where group data show that perceived coarseness increases with increasing roughness.

  • 8.
    Yakubov, Gleb E.
    et al.
    University of Queensland, Australia; Unilever, UK.
    Macakova, Lubica
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. Unilever, UK.
    Wilson, Stephen
    Unilever, UK.
    Windust, John H. C.
    Unilever, UK.
    Stokes, Jason R.
    Unilever, UK; University of Queensland, Australia.
    Aqueous lubrication by fractionated salivary proteins: Synergistic interaction of mucin polymer brush with low molecular weight macromolecules2015Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 89, s. 34-45Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The remarkable lubrication provided by saliva in the oral cavity is vital to human health and wellbeing. Yet, molecular mechanisms for saliva lubrication remain unclear. In this work we report a possible mechanism of synergistic interaction between salivary proteins. By isolating a number of salivary protein fractions, we identify major protein candidates that contribute to saliva lubrication. We discover that a key driver for low friction is a hydrated brush-like layer formed by glycosylated species, with an essential synergistic contribution coming from the low molecular weight components that facilitate spreading, adsorption and strengthening of the salivary film on hydrophobic substrates. Lessons may be learned from saliva for understanding other natural bio-aqueous lubrication systems and for the development of saliva mimics.

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