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  • 1.
    Ali, A.
    et al.
    Malmö University, Sweden; Speximo AB, Sweden.
    Ringstad, L
    RISE Research Institutes of Sweden, Bioekonomi och hälsa.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Falkman, P.
    Malmö University, Sweden.
    Wahlgren, M.
    Lund University, Sweden.
    Engblom, J.
    Malmö University, Sweden.
    Tactile friction of topical creams and emulsions: Friction measurements on excised skin and VitroSkin® using ForceBoard™2022Inngår i: International Journal of Pharmaceutics, ISSN 0378-5173, E-ISSN 1873-3476, Vol. 615, artikkel-id 121502Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Tactile perception can be investigated through ex vivo friction measurements using a so–called ForceBoard™, providing objective assessments and savings in time and money, compared to a subjective human panel. In this work we aim to compare excised skin versus VitroSkin® as model substrates for tactile friction measurements. A further aim is to detect possible differences between traditional surfactant-based creams, and a particle-stabilized (Pickering) cream and investigate how the different substrates affect the results obtained. It was found that the difference in tactile friction between excised skin and VitroSkin® was small on untreated substrates. When topical creams were applied, the same trends were observed for both substrates, although the frictional variation over time relates to the difference in surface structure between the two substrates. The results also confirmed that there is a difference between starch-based Pickering formulations and surfactant-based creams after application, indicating that the latter is greasier than Pickering cream. It was also shown that the tactile friction of Pickering emulsions was consistently high even with high amounts of oil, indicating a non-greasy, and non-sticky formulation. The characteristics of starch-stabilized Pickering formulations make them promising candidates in the development of surfactant-free topical formulations with unique tactile properties. © 2022 The Authors

  • 2.
    Ali, A
    et al.
    Malmö University, Sweden; Speximo AB, Sweden.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Burleigh, S
    Lund University, SWeden.
    Lavant, E
    Malmö University, Sweden.
    Ringstad, L
    RISE Research Institutes of Sweden.
    Anderson, CD
    Linköping University, Sweden.
    Wahlgren, M
    Lund University, Sweden.
    Engblom, J
    Malmö University, Sweden.
    Relationship between sensorial and physical characteristics of topical creams: A comparative study on effects of excipients2022Inngår i: International Journal of Pharmaceutics, ISSN 0378-5173, E-ISSN 1873-3476, Vol. 613, artikkel-id 121370Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Rising consumer demands for safer, more natural, and sustainable topical products have led to increased interest in finding alternative excipients, while retaining functionality and cosmetic appeal. Particle-stabilized Pickering creams have emerged as possible alternatives to replace traditional surfactant-stabilized creams and are thus one of the focuses in this study. The aim of this paper was to study relationships between sensorial characteristics and physical properties to understand how different excipients affect these aspects, comparing one starch particle–stabilized and three surfactant-stabilized formulations. A human panel was used to evaluate sensorial perception, while physical properties were deduced by rheology and tactile friction, together with in vivo and ex vivo skin hydration measurements. The results show that sensorial attributes related to the application phase can be predicted with rheology, while afterfeel attributes can be predicted with tactile friction studies. Differences in rheological and sensory properties among surfactant-based creams could mainly be attributed to the type of emollients used, presence of thickeners and surfactant composition. Differences between surfactant-based creams and a Pickering cream were more evident in relation to the afterfeel perception. Presence of starch particles in the residual film on skin results in high tactile friction and low perception of residual coating, stickiness, greasiness, and slipperiness in sensorial afterfeel. © 2021 The Authors

  • 3.
    Arvidsson, Martin
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Ringstad, Lovisa
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Skedung, Lisa
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.
    Duvefelt, Kenneth
    KTH Royal Institute of Technology, Sweden.
    Rutland, Mark W.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material. KTH Royal Institute of Technology, Sweden.
    Feeling fine - the effect of topography and friction on perceived roughness and slipperiness2017Inngår i: Biotribology, ISSN 2352-5738, Vol. 11, s. 92-101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    (1) Background. To design materials with specific haptic qualities, it is important to understand both the contribution of physical attributes from the surfaces of the materials and the perceptions that are involved in the haptic interaction. (2) Methods. A series of 16 wrinkled surfaces consisting of two similar materials of different elastic modulus and 8 different wrinkle wavelengths were characterized in terms of surface roughness and tactile friction coefficient. Sixteen participants scaled the perceived Roughness and Slipperiness of the surfaces using free magnitude estimation. Friction experiments were performed both by participants and by a trained experimenter with higher control. (3) Results and discussion. The trends in friction properties were similar for the group of participants performing the friction measurements in an uncontrolled way and the experiments performed under well-defined conditions, showing that the latter type of measurements represent the general friction properties well. The results point to slipperiness as the key perception dimension for textures below 100. μm and roughness above 100. μm. Furthermore, it is apparent that roughness and slipperiness perception of these types of structures are not independent. The friction is related to contact area between finger and material. Somewhat surprising was that the material with the higher elastic modulus was perceived as more slippery. A concluding finding was that the flat (high friction) reference surfaces were scaled as rough, supporting the theory that perceived roughness itself is a multidimensional construct with both surface roughness and friction component.

    Fulltekst (pdf)
    fulltext
  • 4.
    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.

  • 5.
    Hansson, Petra M
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Skedung, Lisa
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Claesson, Per M
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Schoelkopf, Joachim
    Gane, Patrick A C
    Robust hydrophobic surfaces displaying different surface roughness scales while maintaining the same wettability2011Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, nr 13, s. 8153-8159Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A range of surfaces coated with spherical silica particles, covering the size range from nanometer to micrometer, have been produced using Langmuir-Blodgett (LB) deposition. The particles were characterized both in suspension and in the Langmuir trough to optimize the surface preparation procedure. By limiting the particle aggregation and surface layer failures during the preparation steps, well-defined monolayers with a close-packed structure have been obtained for all particle sizes. Thus, this procedure led to structured surfaces with a characteristic variation in the amplitude and spatial roughness parameters. In order to obtain robust surfaces, a sintering protocol and an AFM-based wear test to determine the stability of the deposited surface layer were employed. Hydrophobization of the LB films followed by water contact angle measurements showed, for all tested particle sizes, the same increase in contact angle compared to the contact angle of a flat hydrophobic surface. This indicates nearly hexagonal packing and gives evidence for nearly, complete surface wetting of the surface features.

  • 6.
    Harris, Kathryn L
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Collier, Elizabeth S
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. KTH Royal Institute of Technology, Sweden.
    A Sticky Situation or Rough Going?: Influencing Haptic Perception of Wood Coatings Through Frictional and Topographical Design2021Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 69, nr 3, artikkel-id 113Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Improving the tactile aesthetics of products that can be described as touch intensive is an increasing priority within many sectors, including the furniture industry. Understanding which physical characteristics contribute to the haptic experience of a surface, and how, is therefore highly topical. It has earlier been shown that both friction and topography affect tactile perception. Thus, two series of stimuli have been produced using standard coating techniques, with systematic variation in (physical) friction and roughness properties. This was achieved through appropriate selection of matting agents and resins. The stimuli sets were then evaluated perceptually to determine the extent to which discrimination between pairs of surfaces followed the systematic materials variation. In addition to investigating the role of the physical properties in discrimination of the surfaces, their influence on perceived pleasantness and naturalness was also studied. The results indicate that changes in tactile perception can be understood in terms of friction and roughness, and that varying the matting agents (topography) and resins (material properties) in the coatings provide the controlling factors for furniture applications. Perceived pleasantness is associated with low friction and smoother topography, whilst perceived naturalness is found to be described by an interaction between tactile friction and the average maximum peak height of the surface features. Graphic Abstract: [Figure not available: see fulltext.] © 2021, The Author(s).

  • 7.
    Jin, Ruting
    et al.
    University of Massachusetts, USA.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Cazeneuve, Colette
    L'Oreal, France.
    Chang, Jeanne C.
    L'Oreal, USA.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Ruths, Marina
    University of Massachusetts, USA.
    Luengo, Gustavo S.
    L'Oreal, France.
    Bioinspired Self-Assembled 3D Patterned Polymer Textures as Skin Coatings Models: Tribology and Tactile Behavior2020Inngår i: Biotribology, ISSN 2352-5738, Vol. 24, artikkel-id 100151Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is well known that during evolution, specific surface patterns emerged (e.g., on lotus leaves and butterfly wings) endowed with many remarkable surface properties (superhydrophobicity, vibrant structural color, delicate textures, etc.). In order to obtain these natural effects in cosmetics, we look for ways to transfer topographic patterns in coatings and treatments. Textured polymer surfaces were studied to explore their friction properties on the microscale and possible correlations with human tactile friction on the macroscale. We have chosen self-assembling block and random copolymers as model systems to prepare reliable biomimetic films with different micrometer and nanometer scale randomly patterned and randomly rough surfaces. The surface texture of the films was characterized by atomic force microscopy (AFM), and their tribological (friction) properties were studied with a surface forces apparatus (SFA) at a low sliding speed of 3 μm/s and at a speed of 10 cm/s relevant to realistic applications. The results are evaluated in terms of polymer segment mobility, interpenetration, entanglement and relaxation at interfaces, surface texture as described by roughness parameters, and interlocking of asperities. A stiction spike (static friction) was commonly found for the randomly patterned glassy polymer films. Random roughness patterns made from semi-crystalline polymers above their Tg gave high friction at low speed, but their friction coefficients were reduced at high speed due to less time for local entanglement and relaxations. The friction response of one of them was also affected differently by humidity than that of glassy polymer films. Tactile friction measurements with a human finger sliding against the polymer films revealed that the textures also provided differences at the macroscale, although the dynamic changes possibly due to lipid transfer, occlusion of moisture and/or damage of the films makes it difficult to draw robust conclusions. Finally, as an example, it is shown that these textures can be transferred to a soft elastomeric skin mimic substrate. This study introduces the concept of surface patterning by self-assembly to deliver tactile sensorial properties in coatings.

  • 8.
    Sjövall, Peter
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Metodik för produktframtagning.
    Gregoire, Sebastien
    L’Oréal Research and Innovation, France.
    Wargniez, William
    L’Oréal Research and Innovation, France.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Luengo, Gustavo
    L’Oréal Research and Innovation, France.
    3D Molecular Imaging of Stratum Corneum by Mass Spectrometry Suggests Distinct Distribution of Cholesteryl Esters Compared to Other Skin Lipids2022Inngår i: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 23, nr 22, artikkel-id 13799Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The crucial barrier properties of the stratum corneum (SC) depend critically on the design and integrity of its layered molecular structure. However, analysis methods capable of spatially resolved molecular characterization of the SC are scarce and fraught with severe limitations, e.g., regarding molecular specificity or spatial resolution. Here, we used 3D time-of-flight secondary ion mass spectrometry to characterize the spatial distribution of skin lipids in corneocyte multilayer squams obtained by tape stripping. Depth profiles of specific skin lipids display an oscillatory behavior that is consistent with successive monitoring of individual lipid and corneocyte layers of the SC structure. Whereas the most common skin lipids, i.e., ceramides, C24:0 and C26:0 fatty acids and cholesteryl sulfate, are similarly organized, a distinct 3D distribution was observed for cholesteryl oleate, suggesting a different localization of cholesteryl esters compared to the lipid matrix separating the corneocyte layers. The possibility to monitor the composition and spatial distribution of endogenous lipids as well as active drug and cosmetic substances in individual lipid and corneocyte layers has the potential to provide important contributions to the basic understanding of barrier function and penetration in the SC. © 2022 by the authors.

  • 9.
    Sjövall, Peter
    et al.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Skedung, Lisa
    RISE - Research Institutes of Sweden, Biovetenskap och material, Yta, process och formulering.
    Gregoire, Sébastien
    L’OREAL Research and Innovation, France.
    Biganska, Olga
    L’OREAL Research and Innovation, France.
    Clément, Franck
    L’OREAL Research and Innovation, France.
    Luengo, Gustavo S
    L’OREAL Research and Innovation, France.
    Imaging the distribution of skin lipids and topically applied compounds in human skin using mass spectrometry2018Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 8, nr 1, artikkel-id 16683Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The barrier functions of skin against water loss, microbial invasion and penetration of xenobiotics rely, in part, on the spatial distribution of the biomolecular constituents in the skin structure, particularly its horny layer (stratum corneum). However, all skin layers are important to describe normal and dysfunctional skin conditions, and to develop adapted therapies or skin care products. In this work, time-of-flight secondary ion mass spectrometry (ToF-SIMS) combined with scanning electron microscopy (SEM) was used to image the spatial distribution of a variety of molecular species, from stratum corneum down to dermis, in cross-section samples of human abdominal skin. The results demonstrate the expected localization of ceramide and saturated long-chain fatty acids in stratum corneum (SC) and cholesterol sulfate in the upper part of the viable epidermis. The localization of exogenous compounds is demonstrated by the detection and imaging of carvacrol (a constituent of oregano or thyme essential oil) and ceramide, after topical application onto ex vivo human skin. Carvacrol showed pronounced accumulation to triglyceride-containing structures in the deeper parts of dermis. In contrast, the exogenous ceramide was found to be localized in SC. Furthermore, the complementary character of this approach with classical ex vivo skin absorption analysis methods is demonstrated.

  • 10.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. KTH Royal Institute of Technology, Sweden.
    Arvidsson, Martin
    Stockholm University, Sweden.
    Chung, Jun-Young
    National Institute of Standards and Technology, USA; Harvard University, USA.
    Stafford, Christopher M.
    National Institute of Standards and Technology, USA.
    Berglund, Birgitta
    Stockholm University, Sweden; Karolinska Institutet, Sweden.
    Rutland, Mark
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Feeling small: Exploring the tactile perception limits2013Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 3, artikkel-id 2617Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The human finger is exquisitely sensitive in perceiving different materials, but the question remains as to what length scales are capable of being distinguished in active touch. We combine material science with psychophysics to manufacture and haptically explore a series of topographically patterned surfaces of controlled wavelength, but identical chemistry. Strain-induced surface wrinkling and subsequent templating produced 16 surfaces with wrinkle wavelengths ranging from 300a nm to 90a μm and amplitudes between 7a nm and 4.5a μm. Perceived similarities of these surfaces (and two blanks) were pairwise scaled by participants, and interdistances among all stimuli were determined by individual differences scaling (INDSCAL). The tactile space thus generated and its two perceptual dimensions were directly linked to surface physical properties - the finger friction coefficient and the wrinkle wavelength. Finally, the lowest amplitude of the wrinkles so distinguished was approximately 10a nm, demonstrating that human tactile discrimination extends to the nanoscale.

  • 11.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. KTH Royal Institute of Technology, Sweden.
    Buraczewska-Norin, Izabela
    Omega Pharma Nordic, Sweden.
    Dawood, Nagum
    Omega Pharma Nordic, Sweden; Uppsala University, Sweden.
    Rutland, Mark W.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. KTH Royal Institute of Technology, Sweden.
    Ringstad, Lovisa
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Tactile friction of topical formulations2016Inngår i: Skin research and technology, ISSN 0909-752X, E-ISSN 1600-0846, Vol. 22, nr 1, s. 46-54Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: The tactile perception is essential for all types of topical formulations (cosmetic, pharmaceutical, medical device) and the possibility to predict the sensorial response by using instrumental methods instead of sensory testing would save time and cost at an early stage product development. Here, we report on an instrumental evaluation method using tactile friction measurements to estimate perceptual attributes of topical formulations. Methods: Friction was measured between an index finger and an artificial skin substrate after application of formulations using a force sensor. Both model formulations of liquid crystalline phase structures with significantly different tactile properties, as well as commercial pharmaceutical moisturizing creams being more tactile-similar, were investigated. Friction coefficients were calculated as the ratio of the friction force to the applied load. The structures of the model formulations and phase transitions as a result of water evaporation were identified using optical microscopy. Results: The friction device could distinguish friction coefficients between the phase structures, as well as the commercial creams after spreading and absorption into the substrate. In addition, phase transitions resulting in alterations in the feel of the formulations could be detected. A correlation was established between skin hydration and friction coefficient, where hydrated skin gave rise to higher friction. Also a link between skin smoothening and finger friction was established for the commercial moisturizing creams, although further investigations are needed to analyse this and correlations with other sensorial attributes in more detail. Conclusion: The present investigation shows that tactile friction measurements have potential as an alternative or complement in the evaluation of perception of topical formulations.

  • 12.
    Skedung, Lisa
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Collier, Elizabeth S
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Harris, Kathryn L
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Wallqvist, Viveca
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Nyhus, Anne Kari
    Microbeads, Norway.
    Björndal, Lene
    Microbeads, Norway.
    FINE-TUNING THE TACTILE PERCEPTION OF COATINGS2021Inngår i: European Coatings Journal, ISSN 0930-3847, Vol. 6, s. 32-37Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Human tactile evaluations were combined with tactile friction measurements to quantify the perceptual experience of touching coated panels. Monosized beads of nine different polymer compositions were added to a soft-touch waterborne two-component PUR coating. Introducing beads of different composition affected tactile perception.

  • 13.
    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.

  • 14.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Danerlöv, Katrin
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Olofsson, Ulf
    Aikala, Maiju
    Niemi, Kari
    Kettle, John
    Rutland, Mark W.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Finger friction measurements on coated and uncoated printing papers2010Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 37, nr 2, s. 389-399Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A macroscopic finger friction device consisting of a piezoelectric force sensor was evaluated on 21 printing papers of different paper grades and grammage. Friction between a human finger and the 21 papers was measured and showed that measurements with the device can be used to discriminate a set of similar surfaces in terms of finger friction. When comparing the friction coefficients, the papers group according to paper grade and the emerging trend is that the rougher papers have a lower friction coefficient than smoother papers. This is interpreted in terms of a larger contact area in the latter case. Furthermore, a decrease in friction coefficient is noted for all papers on repeated stroking (15 cycles back and forth with the finger). Complementary experiments indicate that both mechanical and chemical modifications of the surface are responsible for this decrease: (1) X-ray photoelectron spectroscopy measurements show that lipid material is transferred from the finger to the paper surface, (2) repeated finger friction measurements on the same paper sample reveal that only partial recovery of the frictional behaviour occurs and (3) profilometry measurements before and after stroking indicate small topographical changes associated with repeated frictional contacts.

  • 15.
    Skedung, Lisa
    et al.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    El Rawadi, Charles
    L Oreal Research and Innovation, France.
    Arvidsson, Martin
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Farcet, Celine
    L Oreal Research and Innovation, France.
    Luengo, Gustavo S
    L Oreal Research and Innovation, France.
    Breton, Lionel
    L Oreal Research and Innovation, France.
    Rutland, Mark W.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material. KTH Royal Institute of Technology, Sweden.
    Mechanisms of tactile sensory deterioration amongst the elderly2018Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 8, nr 1, artikkel-id 5303Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is known that roughness-smoothness, hardness-softness, stickiness-slipperiness and warm-cold are predominant perceptual dimensions in macro-, micro- and nano- texture perception. However, it is not clear to what extent active tactile texture discrimination remains intact with age. The general decrease in tactile ability induces physical and emotional dysfunction in elderly, and has increasing significance for an aging population. We report a method to quantify tactile acuity based on blinded active exploration of systematically varying micro-textured surfaces and a same-different paradigm. It reveals that elderly participants show significantly reduced fine texture discrimination ability. The elderly group also displays statistically lower finger friction coefficient, moisture and elasticity, suggesting a link. However, a subpopulation of the elderly retains discrimination ability irrespective of cutaneous condition and this can be related to a higher density of somatosensory receptors on the finger pads. Skin tribology is thus not the primary reason for decline of tactile discrimination with age. The remediation of cutaneous properties through rehydration, however leads to a significantly improved tactile acuity. This indicates unambiguously that neurological tactile loss can be temporarily compensated by restoring the cutaneous contact mechanics. Such mechanical restoration of tactile ability has the potential to increase the quality of life in elderly. 

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  • 16.
    Skedung, Lisa
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Harris, Kathryn L
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Collier, Elizabeth S
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Arvidsson, Martin
    RISE - Research Institutes of Sweden (2017-2019).
    Wäckerlin, Aneliia
    Glas Trösch AG, Switzerland.
    Haag, Walter
    Glas Trösch AG, Switzerland.
    Bieri, Marco
    Glas Trösch AG, Switzerland.
    Romanyuk, Andriy
    Glas Trösch AG, Switzerland.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. KTH Royal Institute of Technology, Sweden.
    Feeling smooth: Psychotribological probing of molecular composition2018Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 66, nr 4, s. 1-10, artikkel-id 138Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this study was to evaluate whether smooth surfaces varying in surface chemistry could be perceptually distinguished with the sense of touch. A set of ten glass surfaces was prepared which varied systematically in terms of the molecular composition of a thin coating of low topography. The contact angle, contact angle hysteresis, and surface energy were evaluated as objective physical parameters characterizing each coating. Additionally, the interaction forces between a human finger and the different coatings were quantified and compared in terms of tactile friction coefficients. The surfaces were evaluated psychophysically in terms of perceived similarities and were then ranked according to pleasantness. The participants could perceptually distinguish between surfaces varying in surface chemistry and a primary and secondary perceptual dimension were identified as sufficient to distinguish them. The primary dimension correlates with surface free energy, but both tactile friction and surface energy contribute to this dimension depending on whether the coatings are organic or inorganic. The secondary dimension could not be identified explicitly in terms of a physical quantity but is discussed in terms of recent developments in the literature. Coated glass is characterized by high friction coefficient upon interaction with a human finger as well as significant hysteresis in the stroking directions (lower applied load and higher friction in the backward stroke). Despite the complexity of the tribology, pleasantness can be clearly linked to it, where low friction (high contact angle) materials receive a higher ranking. © The Author(s) 2018.

  • 17.
    Skedung, Lisa
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Harris, Kathryn L
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Hörlin, Elizabeth
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. KTH Royal Institute of Technology, Sweden.
    The finishing touches: the role of friction and roughness in haptic perception of surface coatings.2020Inngår i: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 238, s. 1511-1524Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Humans are extraordinarily skilled in the tactile evaluation of, and differentiation between, surfaces. The chemical and mechanical properties of these surfaces are translated into tactile signals during haptic exploration by mechanoreceptors in our skin, which are specialized to respond to different types of temporal and mechanical stimulation. Describing the effects of measurable physical characteristics on the human response to tactile exploration of surfaces is of great interest to manufacturers of household materials so that the haptic experience can be considered during design, product development and quality control. In this study, methods from psychophysics and materials science are combined to advance current understanding of which physical properties affect tactile perception of a range of furniture surfaces, i.e., foils and coatings, thus creating a tactile map of the furniture product landscape. Participants' responses in a similarity scaling task were analyzed using INDSCAL from which three haptic dimensions were identified. Results show that specific roughness parameters, tactile friction and vibrational information, as characterized by a stylus profilometer, a Forceboard, and a biomimetic synthetic finger, are important for tactile differentiation and preferences of these surface treatments. The obtained dimensions are described as distinct combinations of the surface properties characterized, rather than as 'roughness' or 'friction' independently. Preferences by touch were related to the roughness, friction and thermal properties of the surfaces. The results both complement and advance current understanding of how roughness and friction relate to tactile perception of surfaces.

  • 18.
    Skedung, Lisa
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Hörlin, Elizabeth
    RISE Research Institutes of Sweden.
    Harris, Kathryn L
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Rutland, Mark W.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. KTH Royal Institute of Technology, Sweden.
    Applebaum, Mara
    L’Oréal Research and Innovation, USA.
    Greaves, Andrew
    L’Oréal Research and Innovation, France.
    Luengo, Gustavo
    L’Oréal Research and Innovation, France.
    A Curly Q: Is Frizz a Matter of Friction?2021Inngår i: Perception, ISSN 0301-0066, E-ISSN 1468-4233, Vol. 50, nr 8, s. 728-732Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The oft discussed and fretted over environmental influences on hair have led to a popular consensus which suggests that elevated temperature and humidity lead to frizzier, wilder hair. However, few attempts at actually quantifying these effects have been made. Although frizziness is usually perceived visually, here the influence of variations in temperature and humidity on the tactile perception and friction of curly and straight hair were investigated. It is shown that changes in humidity may disproportionately affect perceived frizziness of curly hair by touch due to concurrent changes in the tactile friction. © The Author(s) 2021.

  • 19.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Ringstad, Lovisa
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Buraczewska-Norin, Izabela
    KTH Royal Institute of Technology, Sweden.
    Rutland, Mark
    RISE., SP – Sveriges Tekniska Forskningsinstitut. ACO HUD Nordic AB, Sweden.
    Tactile friction of topical formulations2014Inngår i: 5th World Tribology Congress, WTC 2013, 2014, Vol. 3, s. 2249-2251s. 2249-2251Konferansepaper (Fagfellevurdert)
  • 20.
    Skedung, Lisa
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.
    Rutland, Mark William
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. Stockholm University, Sweden.
    Arvidsson, Martin
    Stockholm University, Sweden.
    Berglund, Birgitta
    Stockholm University, Sweden.
    Chung, Jun-young
    National Institute of Standards and Technology, USA.
    Stafford, Christopher M.
    National Institute of Standards and Technology, USA.
    Tribology, texture and touch2014Inngår i: 5th World Tribology Congress, WTC 2013, 2014, Vol. 3, s. 2270-2273s. 2270-2273Konferansepaper (Fagfellevurdert)
  • 21.
    Skedung, Lisa
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Savvidou, Eleni
    Stockholm University, Sweden.
    Schellenberger, Steffen
    RISE Research Institutes of Sweden, Material och produktion, Metodik för produktframtagning.
    Reimann, Anders
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Cousins, Ian T.
    Stockholm University, Sweden.
    Benskin, Jonathan P.
    Stockholm University, Sweden.
    Identification and quantification of fluorinated polymers in consumer products by combustion ion chromatography and pyrolysis-gas chromatography-mass spectrometry2024Inngår i: Environmental Science: Processes & Impacts, ISSN 2050-7887, E-ISSN 2050-7895, Vol. 26, artikkel-id 82Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Total fluorine was determined in 45 consumer product samples from the Swedish market which were either suspected or known to contain fluorinated polymers. Product categories included cookware (70–550 000 ppm F), textiles (10–1600 ppm F), electronics (20–2100 ppm F), and personal care products (10–630 000 ppm F). To confirm that the fluorine was organic in nature, and deduce structure, a qualitative pyrolysis-gas chromatography-mass spectrometry (pyr-GC/MS) method was validated using a suite of reference materials. When applied to samples with unknown PFAS content, the method was successful at identifying polytetrafluoroethylene (PTFE) in cookware, dental products, and electronics at concentrations as low as 0.1–0.2 wt%. It was also possible to distinguish between 3 different side-chain fluorinated polymers in textiles. Several products appeared to contain high levels of inorganic fluorine. This is one of the few studies to quantify fluorine in a wide range of consumer plastics and provides important data on the concentration of fluorine in materials which may be intended for recycling, along with insights into the application of pyr-GC/MS for structural elucidation of fluorinated polymers in consumer products.

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  • 22.
    Svedlund, Joel
    et al.
    Peak 63 AB, Sweden.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    PFAS Substitution Guide : FOR TEXTILE SUPPLY CHAINS2022Rapport (Annet vitenskapelig)
    Abstract [en]

    This guide is a support for textile industry players, to improve commmunication about chemicals and raise the possibility for well-informed substitution work. It focuses on subsitution of highly fluorinated substances, also known as per- and polyfluoroalkyl substances (PFAS), offering textile buyers a deeper understanding about water repellence and the associated chemistry. The guide can be used as a starting point for your chemicals management and substitution work, with many links to other information sources. We recommend using the Table of Contents below as a navigational tool, to start filling any knowledge gaps and expand your reading from there.

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