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  • 1. Boschkova, K
    et al.
    Kronberg, B
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Rutland, M
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, 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, 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.

  • 3.
    Ghasemi, Rohollah
    et al.
    Jönköping University, Sweden.
    Elmquist, Lennart
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SWECAST.
    Ghassemali, Ehsan
    Jönköping University, Sweden.
    Salomonsson, Kent
    Jönköping University, Sweden.
    Jarfors, Anders Eric Wollmar
    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.

  • 4. Krick, B. A.
    et al.
    Pitenis, A. A.
    Harris, Kathryn L
    University of Florida, USA.
    Junk, C. P.
    Sawyer, W. G.
    Brown, S. C.
    Rosenfeld, H. D.
    Kasprzak, D. J.
    Johnson, R. S.
    Chan, C. D.
    Blackman, G. S.
    Ultralow wear fluoropolymer composites: Nanoscale functionality from microscale fillers2016Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 95, s. 245-255Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Polytetrafluoroethylene (PTFE) filled with certain alumina additives has wear rates over four orders of magnitude lower than unfilled PTFE. The mechanisms for this wear reduction have remained a mystery. In this work, we use a combination of techniques to show that porous, nanostructured alumina microfillers (not nanofillers) are critical for this wear reduction. The microscale alumina particles break during sliding into nanoscale fragments. X-ray microtomography, transmission electron microscopy and infrared spectroscopy reveal nanoscale alumina fragments accumulated in the tribofilms. Tribochemically generated carboxylate endgroups bond to metal species in the transfer film and to alumina fragments in the surface of the polymer composite. These mechanically reinforced tribofilms create robust sliding surfaces and lead to a dramatic reduction in wear. © 2015 The Authors. 

  • 5.
    Macakova, Lubica
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, 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.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, 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.
    Rohlmann, Patrick
    et al.
    KTH Royal Institute of Technology, Sweden.
    Watanabe, Seiya
    KTH Royal Institute of Technology, Sweden; Tokyo University of Science, Japan.
    Shimpi, Manishkumar
    Luleå University of Technology, Sweden.
    Leckner, Johan
    Axel Christiernsson International AB, Sweden.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. KTH Royal Institute of Technology, Sweden; University of New South Wales, Australia.
    Harper, Jason
    University of New South Wales, Australia.
    Glavatskih, Sergei
    KTH Royal Institute of Technology, Sweden; University of New South Wales, Australia; Ghent University, Belgium.
    Boundary lubricity of phosphonium bisoxalatoborate ionic liquids2021Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 161, artikkel-id 107075Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The lubricating performance of trihexyl(tetradecyl)phosphonium bisoxalatoorthoborate (P-BOB) ionic liquid is analysed at 80 °C and 140 °C, and compared to an ionic liquid containing a partially hydrated version of the anion. The reduction of the anions produces oxalate complexes that contribute synergistically to lower friction. The role of oxalate in enhancing lubricity was indicated by the fact that the partially hydrated anion is a precursor orthoborate anion complexed with oxalic acid. It consequently showed the lowest friction at 80 °C. Upon heating, the precursor was converted into [BOB]− and displayed the same friction at 140 °C as the fully synthesised species. The mechanisms of the breakdown of the [BOB]− anion and formation of the tribofilm are elucidated. © 2021 The Authors

  • 8. Shu, Ju
    et al.
    Harris, Kathryn L
    KTH Royal Institute of Technology, Sweden.
    Munavirov, Bulat
    Westbroek, Rene
    Leckner, Johan
    Glavatskih, Sergei
    Tribology of polypropylene and Li-complex greases with ZDDP and MoDTC additives2018Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 118, s. 189-195Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of thickener and additive interactions on grease lubricating performance is examined. Polypropylene and lithium complex thickened (Li-complex) greases were tested both as neat greases and with a 2 wt% addition of ZDDP and/or MoDTC. A combination of ZDDP and MoDTC in the polypropylene grease provided the lowest friction with greater longevity compared to the Li-complex grease with the same additives, independent of sliding speed, contact pressure, temperature or type of sliding: continuous vs. reciprocating. The additive combination of ZDDP and MoDTC provided the best antiwear performance in both greases. Depending on the grease sample type, EDS revealed the presence of iron, zinc, phosphorous, sulfur, and molybdenum within the tribofilms.

  • 9.
    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.

  • 10.
    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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