Tactile friction of topical formulations

Skedung, Lisa; Buraczewska-Norin, Izabela; Dawood, Nagum; Rutland, Mark W.; Ringstad, Lovisa

doi:10.1111/srt.12227

Cited by 22 publications

(17 citation statements)

References 40 publications

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“…This friction hysteresis has not previously been observed on any of the other materials studied using our apparatus, which include paper [12], artificial skin [14], tissue and polymer. It was observed that on average the applied load in the backward stroke (all measurements) was 1.0 N while for the forward stroke this value was significantly larger at 1.5 N. When the finger encountered higher friction, a lower load was applied so that the finger could slide on the surface, most probably an unconscious action which has been addressed previously [12,15] and results from the fact that the tendency is to probe with a constant friction force, rather than constant load.…”

Section: Physical Characterisationsupporting

confidence: 48%

Feeling Smooth: Psychotribological Probing of Molecular Composition

et al. 2018

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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.

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Section: Physical Characterisationsupporting

confidence: 48%

Feeling Smooth: Psychotribological Probing of Molecular Composition

et al. 2018

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“…A physical characterization of the rheological, mechanical, and tribological properties of preparations is therefore necessary to understand their behavior under different stresses (ease of removal of product from the container, good spreadability on skin, acceptable viscosity …) and optimize their design. Such tools are complementary to sensory analysis and made possible to deeply characterize the textural properties of formulations and predict their performances during the use for topical application …”

Section: Introductionmentioning

confidence: 99%

“…Such tools are complementary to sensory analysis and made possible to deeply characterize the textural properties of formulations and predict their performances during the use for topical application. [14][15][16] The present work focused on a range of commercial topical products, selected with various compositions and galenic forms either gel or emulsion. They were analyzed using sensory analysis, rheology, texture analysis, and a frictiometer in order to develop a non-subjective characterization of the tactile properties of topical products.…”

Section: Introductionmentioning

confidence: 99%

Instrumental and sensory methodologies to characterize the residual film of topical products applied to skin

Savary

Gilbert

Grisel

et al. 2019

Skin Research and Technology

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Background The work is aimed at the development of a methodology to characterize the tactile properties of topical products during application. Specific attention was paid to the study of the residual properties left at the surface of the skin. This approach was interestingly used to better understand the formulation factors governing the skinfeel of topical preparations. Materials and Methods Cosmetic and pharmaceutical topical products were selected based on their various texture, galenic form (gel or emulsion), and composition (polymer used as texturing agent). Key texture attributes namely Firmness, Stickiness, Spreadability, and Amount of residue were objectively evaluated using sensory analysis. Additionally, texture analysis (compression test), rheology (flow test), and tribology (in vivo friction test) were carried out. Results Sensory evaluations highlighted a great diversity of tactile properties among products when applied to skin. For example, assessors perceived an important amount of residue left by emulsions whereas gels were not leaving any residue after application to the skin. These results were confirmed by in vivo tactile friction measurements with two distinct evolutions in time of the residual film properties. Conclusion The present investigation shows how the tactile properties of topical gels and emulsions are studied using complementary tests in order to understand and improve the skinfeel of topical preparations.

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“…Analysing the behaviour of finger tactile friction in different environments will deepen our understanding of the mechanisms involved in tactile perception and, therefore, be helpful for optimizing hand-operated activities under liquid and moist conditions [13], as well as for the design and operation of intelligent robots in a liquid environment. Also, it would be beneficial for research and development of cosmetic products, such as moisturizers and lotions [14][15][16][17]. Finally, finger-based tactile testing is used as a nonoral based method to characterize oral perception because of the similar sensory assessment of tactility and food texture [11,18].…”

Section: Introductionmentioning

confidence: 99%

Influence of different fluid environments on tactile perception and finger friction

Zhou

Masen

et al. 2022

J. R. Soc. Interface.

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Human beings often explore and perceive the characteristics of objects by touching with their fingers. During this process, the contact pressure and shear stress acting on the skin also modulate the tactile sensation. The external environment is an important factor that influences tactile perception as well as the finger friction characteristics. The purpose of this study was to investigate the effects of fluid environments, such as air, deionized water (DW) and thickened water (TW), on perceived roughness and relevant friction behaviour during finger movement. Two studies were performed to analyse the effect of fluid environment as well as the influence of lubricant viscosity on finger tactile friction behaviour. Participants conducted perception and sliding friction tests with their index finger in air and submerged in DW and TW, respectively. Perception tests were performed using a pairwise comparison, scoring the perceived roughness difference between a reference sample and the test sample. The statistical analysis showed that there was no significant difference in the roughness perception between air and DW, while the sensitivity of perception reduced with increasing lubricant viscosity. An approximate calculation of the film thickness was combined with classical lubrication theory to investigate the relationship between perception and friction. In TW, the thick film formed between the finger and the polytetrafluoroethylene plate changed the contact of the asperities with the skin, thus changing the subjective judgement and friction.

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Tactile friction of topical formulations

Abstract: The present investigation shows that tactile friction measurements have potential as an alternative or complement in the evaluation of perception of topical formulations.

Cited by 22 publications

References 40 publications

Feeling Smooth: Psychotribological Probing of Molecular Composition

Feeling Smooth: Psychotribological Probing of Molecular Composition

Instrumental and sensory methodologies to characterize the residual film of topical products applied to skin

Influence of different fluid environments on tactile perception and finger friction

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