Measuring contact area in a sliding human finger‐pad contact

Liu, X.; Carré, Matt; Zhang, Bin; Lu, Zenghai; Matcher, Stephen J.; Lewis, Roger

doi:10.1111/srt.12387

Cited by 28 publications

(28 citation statements)

References 32 publications

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“…Fingers were used in a pre‐defined randomized manner (excluding thumbs) such that if, for example, the index finger of the right hand was used as finger 1 in one set of experiments, it might have been used as finger 5 in another volunteer's experiment set. Participants were trained to apply 50 g (±5 g) pressure for 1 second during each surface contact using a top‐balance (sensitivity 0.002 g), which relates to a “light‐touch” 28 . Contact with the surface was standardized to a time of 1 second.…”

Section: Methodsmentioning

confidence: 99%

Bacterial transfer to fingertips during sequential surface contacts with and without gloves

et al. 2020

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Bacterial transmission from contaminated surfaces via hand contact plays a critical role in disease spread. However, the fomite‐to‐finger transfer efficiency of microorganisms during multiple sequential surface contacts with and without gloves has not been formerly investigated. We measured the quantity of Escherichia coli on fingertips of participants after 1‐8 sequential contacts with inoculated plastic coupons with and without nitrile gloves. A Bayesian approach was used to develop a mechanistic model of pathogen accretion to examine finger loading as a function of the difference between E coli on surfaces and fingers. We used the model to determine the coefficient of transfer efficiency (λ), and influence of swabbing efficiency and finger area. Results showed that λ for bare skin was higher (49%, 95% CI = 32%‐72%) than for gloved hands (30%, CI = 17%‐49%). Microbial load tended toward a dynamic equilibrium after four and six contacts for gloved hands and bare skin, respectively. Individual differences between volunteers’ hands had a negligible effect compared with use of gloves (P < .01). Gloves reduced loading by 4.7% (CI = −12%‐21%) over bare skin contacts, while 20% of participants accrued more microorganisms on gloved hands. This was due to poor fitting, which created a larger finger surface area than bare hands.

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Section: Methodsmentioning

confidence: 99%

Bacterial transfer to fingertips during sequential surface contacts with and without gloves

et al. 2020

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“…Development of tactile transducers also received significant attention. The tribological mechanisms of skin were mainly studied from friction, contact mechanics, lubrication etc points of view [458]. Both human and animals skins [459] were adopted, including soft skins, hard scales [460,461], and heads [462,463].…”

Section: Skin Tribologymentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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“…The contact area is proportional to w 2/3 and we can represent constant values using Young’s modulus (E), Poisson’s ratio ( v ), and the radius of the finger ( R s ) 28 . We can calculate this through the experiment.…”

Section: Resultsmentioning

confidence: 99%

A study on the effect of fingerprints in a wet system

Kim

Yun

2019

Sci Rep

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In this paper, we study the influence of the fingerprint and sweat on the fingerprint on the friction between the hand and an object. When sweat contacts a finger or an object, it is sometimes easy to pick up the object. In particular, we can see this phenomenon when grasping a thin object such as paper and vinyl. The reason for this phenomenon is the increase of friction force, and this paper physically analyzes this natural phenomenon. To this end, we investigate the cause of the friction force between a solid and liquid to calculate the friction force when water is present within the fingerprint. To support the theoretical analysis, we conduct experiments to measure the friction force by making a finger-shaped silicon specimen. By comparing the theoretical and experimental results, we defined the change of friction force if there was water in the fingerprint. Through this study, it is possible to analyze the role of the fingerprint and sweat on the finger, and thereby explain the friction change depending on the amount of sweat.

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Measuring contact area in a sliding human finger‐pad contact

Abstract: Background/Purpose: The work outlined in this paper was aimed at achieving further

Cited by 28 publications

References 32 publications

Bacterial transfer to fingertips during sequential surface contacts with and without gloves

Bacterial transfer to fingertips during sequential surface contacts with and without gloves

A review of recent advances in tribology

A study on the effect of fingerprints in a wet system

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