Liquid bridge splitting enhances normal capillary adhesion and resistance to shear on rough surfaces

Butler, Matthew; Vella, Dominic

doi:10.1016/j.jcis.2021.08.133

Cited by 24 publications

(6 citation statements)

References 54 publications

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“…Hence, the capillary force would increase with the wetting area once the secretion volume surpasses a wetting threshold. [ 20 ] Aditionally, the moistening of ridges can decrease the modulus at contacting points, which may further increase the friction coefficient and consequently enhance the friction. [ 21 ]…”

Section: Resultsmentioning

confidence: 99%

Reversible Perspiring Artificial “Fingertips”

et al. 2023

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Fingertip perspiration is a vital process within human predation, to which the species owes its survival and its biological success. In this paper, the unique human ability of extensive perspiration and controlled friction in self‐assembled cholesteric liquid crystals is recreated, mimicking the natural processes that occur in the dermis and epidermis of human skin. This is achieved by inducing porosity in responsive, liquid‐bearing material through the controlled‐polymerization phase‐separation process. The unique topography of human fingerprints is further emulated in the materials by balancing the parallel chirality‐induced force and the perpendicular substrate‐anchoring force during synthesis. As a result, artificial fingertips are capable of secreting and re‐absorbing liquid upon light illumination. By demonstrating the function of the soft material in a tribological aspect, it exhibits a controllable anti‐sliding property comparable to human fingertips and subsequently attains a higher degree of biomimicry. This biomimetic fingertip is envisioned being applied in a multitude of fields, ranging from biomedical instruments to interactive, human‐like soft robotic devices.

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Section: Resultsmentioning

confidence: 99%

Reversible Perspiring Artificial “Fingertips”

et al. 2023

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“…This may either promote or impede to formation of either pendular or capillary state suspensions depending on the mixing order and applied shear history. In a specific case of low relative bridge volume, where multiple small capillary bridges are formed only between particle asperities, that is, each bridge width is of the same order of magnitude as the size of the surface asperities, the particle roughness can increase the total capillary force owing to the migration of each small bridge to the minimum local separation between the particles [53]. This migration is only possible if the contact line does not get pinned.…”

Section: Nonideal Wettingmentioning

confidence: 99%

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

Bindgen¹,

Allard²,

Koos

2022

Current Opinion in Colloid & Interface Science

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Liquid-liquid-solid systems are becoming increasingly common in everyday life with many possible applications. Here, we focus on a special case of such liquid-liquid-solid systems, namely, capillary suspensions. These capillary suspensions originate from particles that form a network based on capillary forces and are typically composed of solids in a bulk liquid with an added secondary liquid. The structure of particle networks based on capillary bridges possesses unique properties compared with networks formed via other attractive interactions where these differences are inherently related to the properties of the capillary bridges, such as bridge breaking and coalescence between adjacent bridges. Thus, to tailor the mechanical properties of capillary suspensions to specific requirements, it is important to understand the influences on different length scales ranging from the dynamics of the bridges with varying external stimuli to the often heterogeneous network structure.

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“…In general, when the snow is soft, pressure must be minimized to reduce compaction and plowing, both macroscopically as the ski sinks into the snow and plows/presses it forward, and microscopically as the ski base plows into the surface of the snow (Mössner et al, 2021 ). At the same time, as indicated by Equation (1) above, the area over which the ski base and snow are in close proximity must be minimized in order to avoid large wet patches (Glenne, 1987 ; Nachbauer et al, 2016 ; Butler and Vella, 2022 ).…”

Section: The Factors That Influence Kinetic Friction and Approaches T...mentioning

confidence: 99%

A Scientific Perspective on Reducing Ski-Snow Friction to Improve Performance in Olympic Cross-Country Skiing, the Biathlon and Nordic Combined

Almqvist

Pellegrini

Lintzén

et al. 2022

Front. Sports Act. Living

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Of the medals awarded at the 2022 Winter Olympics in Beijing, 24% were for events involving cross-country skiing, the biathlon and Nordic combined. Although much research has focused on physiological and biomechanical characteristics that determine success in these sports, considerably less is yet known about the resistive forces. Here, we specifically describe what is presently known about ski-snow friction, one of the major resistive forces. Today, elite ski races take place on natural and/or machine-made snow. Prior to each race, several pairs of skis with different grinding and waxing of the base are tested against one another with respect to key parameters, such as how rapidly and for how long the ski glides, which is dependent on ski-snow friction. This friction arises from a combination of factors, including compaction, plowing, adhesion, viscous drag, and water bridging, as well as contaminants and dirt on the surface of and within the snow. In this context the stiffness of the ski, shape of its camber, and material composition and topography of the base exert a major influence. An understanding of the interactions between these factors, in combination with information concerning the temperature and humidity of both the air and snow, as well as the nature of the snow, provides a basis for designing specific strategies to minimize ski-snow friction. In conclusion, although performance on “narrow skis” has improved considerably in recent decades, future insights into how best to reduce ski-snow friction offer great promise for even further advances.

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Liquid bridge splitting enhances normal capillary adhesion and resistance to shear on rough surfaces

Cited by 24 publications

References 54 publications

Reversible Perspiring Artificial “Fingertips”

Reversible Perspiring Artificial “Fingertips”

The behavior of capillary suspensions at diverse length scales: From single capillary bridges to bulk

A Scientific Perspective on Reducing Ski-Snow Friction to Improve Performance in Olympic Cross-Country Skiing, the Biathlon and Nordic Combined

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