Tribology of an assembly of hairs: Influence of multiscale surface chemistry and structure on sensorial tactile properties

Galliano, A.; Fougère, M.; Wolfram, L. J.; Maibach, Howard I.; Luengo, Gustavo S.

doi:10.1111/srt.12993

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…1 In particular, maintaining low friction between hairs is important for satisfactory sensory perception during touching, brushing and combing. 2–7 Consequently, the kinetic friction of hair has been studied using a wide range of experimental techniques from the macroscale to the nanoscale. 8–30 The friction between nanoscale tips and single hairs, 10–14,18,22,26 as well as crossed hair–hair contacts, 23–25 have been investigated using atomic force microscopy (AFM) and high-load nanotribometers.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale friction of biomimetic hair surfaces

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Nanoscale friction of biomimetic hair surfaces

et al. 2023

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“…Several studies have reported geometric hair data with notable inter-and intraracial or geographical group type variabilities [4,[7][8][9][10][11][12][13]. These studies classify the crosssectional area of hair in the following descending order: Asian > Caucasian > African, whilst noting that the degree of ellipticity and curliness increase in this order.…”

Section: Hair Geometrymentioning

confidence: 99%

How different is human hair? A critical appraisal of the reported differences in global hair fibre characteristics and properties towards defining a more relevant framework for hair type classification

Daniels¹,

Fraser²,

Westgate³

2022

Intern J of Cosmetic Sci

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This review critically appraises the reported differences in human hair fibre within three related domains of research: hair classification approaches, fibre characteristics and properties. The most common hair classification approach is based on geo-racial origin, defining three main groups: African, Asian and Caucasian hair. This classification does not account sufficiently for the worldwide hair diversity and intergroups variability in curl, shape, size and colour. A global classification into eight curl types has been proposed but may be too complex for reproducibility. Beyond that, hair cross-sectional shape and area have been found to have an inverse relation to curl: straighter fibres are circular with larger cross-sectional area, whilst the curlier fibres are elliptical with smaller cross-sectional area. These geometrical differences have been associated with bilateral vs homogenous distribution of cortical cell in curly vs straight hair respectively. However, there is no sufficient data demonstrating significant differences in hair amino composition, but proteomic studies are reporting associations of some proteins with curly hair. Eumelanin's relative abundance has been reported in all hair colours except for red hair which has a high pheomelanin content. Higher tensile and fatigue strength of straight hair are reported, however, curly hair fragility is attributed to knotting, and crack and flow formations rather than the structural variations.African hair has been found to have the highest level of lipids, whilst the water sorption of Caucasian hair is the highest, and that of Asian hair the lowest. Not all comparative studies clearly report their hair sampling approaches. Therefore, to strengthen the robustness of comparative studies and to facilitate cross-study data comparisons, it is recommended that the following hair defining characteristics are reported in studies: hair cross sectional diameter/area, curl type, hair assembly colour, as well as where possible donor data (age/gender) and sample pooling approach. AbstraitCette revue évalue de façon critique les différences rapportées sur les fibres capillaires humaines dans trois domaines de recherche connexes : les approches

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“…1 In particular, maintaining low friction between hairs is important for satisfactory sensory perception during touching, brushing and combing. [2][3][4][5][6][7] Consequently, the kinetic friction of hair has been studied using a wide range of experimental techniques from the macroscale to the nanoscale. The friction between nanoscale tips and single hairs, [10][11][12][13][14]18,22,26 as well as crossed hair-hair contacts, [23][24][25] have been investigated using atomic force microscopy (AFM) and high-load nanotribometers.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Friction of Biomimetic Hair Surfaces

Weiand

Ewen

Roiter

et al. 2022

Preprint

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We investigate the nanoscale friction between biomimetic hair surfaces using chemical colloidal probe atomic force microscopy experiments and nonequilibrium molecular dynamics simulations. In the experiments, friction is measured between water-lubricated silica surfaces functionalised with monolayers of either octadecyl or sulfonate groups, which are representative of the surfaces of virgin and ultimately bleached hair, respectively. In the simulations, friction is monitored between coarse-grained model hair surfaces with different levels of chemical damage, where different fractions of grafted lipid molecules are randomly replaced with sulfonate groups. The sliding velocity dependence of friction can be described using an extended stress-augmented thermally activation model. As the damage level increases, the friction generally increases, but its sliding velocity-dependence decreases. At low sliding speeds, which are closer to those encountered physiologically and experimentally, we observe a monotonic increase of friction with the damage ratio, which is consistent with our new experiments using biomimetic surfaces and previous ones using real hair. This observation demonstrates that modified surface chemistry, rather than roughness changes or subsurface damage, control the increase in nanoscale friction of damaged hair. We expect the experimental and computational model surfaces proposed here to be useful to screen the tribological performance of hair care formulations.

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Tribology of an assembly of hairs: Influence of multiscale surface chemistry and structure on sensorial tactile properties

Cited by 5 publications

References 24 publications

Nanoscale friction of biomimetic hair surfaces

Nanoscale friction of biomimetic hair surfaces

How different is human hair? A critical appraisal of the reported differences in global hair fibre characteristics and properties towards defining a more relevant framework for hair type classification

Nanoscale Friction of Biomimetic Hair Surfaces

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