Pillar versus dimple patterned surfaces for wettability and adhesion with varying scales

Li, Meng; Dai, Qingwen; Wang, Xiaolei

doi:10.1098/rsif.2018.0681

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…The interfacial force of friction on soft surfaces can be either reduced or amplified on soft materials, and the behaviors and underlying mechanisms were discussed and analyzed according to the physical fundamentals of wet sliding. In essence, the textures' different abilities to achieve interfacial sliding were attributable to their inverse design orientations to liquids; in this design, the polygonal pillars separated through channels were "open" to liquids, whereas the discrete dimples were "closed" to liquids [126]. It was suggested that the surface-texture-induced decrease in contact area, second lubrication, micro-dynamic pressure, draining effect, and so on imposed significant effects.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Regulation and control of wet friction of soft materials using surface texturing: A review

Shi

et al. 2022

Friction

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Surface texturing is a smart strategy that is commonly used in nature or industry to improve the tribological properties of sliding surfaces. Herein, we focus on the recent research progress pertaining to the wet friction modification of soft elastomers via texturing. To consider the pertinent physical mechanisms, we present and discuss the fundamentals of wet sliding on soft surfaces (including dewetting and wetting transitions in compliant contacts). Subsequently, we consider the methods in which the characteristic textures regulate and control wet sliding behaviors on soft surfaces; these textures range from conventional patterns of dimples to bioinspired architectures and can either positively or adversely impact the interfacial friction force. Furthermore, we briefly address the perspectives, potential applications, and challenges of texture design for modifying the friction characteristics of soft materials.

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Section: Summary and Perspectivesmentioning

confidence: 99%

Regulation and control of wet friction of soft materials using surface texturing: A review

Shi

et al. 2022

Friction

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“…[19] We are interested in using the landscape and flux analysis to learn the Wu-Xing network model in a global and physical way, e.g., its potential systematic states and how those states could relate to human health or diseases hypothetically. Furthermore, we hope that the quantitative landscape and flux analysis can enlighten us about the pathways leading from a disease state to a healthy state [20][21][22] and shed light on why and how the Wu-Xing theory is so useful beyond its philosophical impact.…”

Section: The Wu-xing Networkmentioning

confidence: 99%

The landscape and flux of a minimum network motif, Wu Xing*

Zhang¹,

Xia²,

Wang³

2020

Chinese Phys. B

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Wu-Xing theory is an ancient philosophy that serves as a guiding principle in the traditional Chinese medicine (TCM). It has been used to explain the unbalance among the TCM organ systems in disease states and provide treatment philosophy qualitatively. Until now, it is still a challenge to explore the Wu-Xing theory beyond its philosophical nature. In this study, we established a quantitative framework using the landscape and flux theory to characterize the nature of the Wu-Xing theory from a perspective of a minimal network motif and leave certain specific functional aspects of Wu-Xing theory for future exploration. We uncovered the irregular ring shape of projection landscape for the Wu-Xing network with several local basins and barriers. We found that the dynamics of the self-organized Wu-Xing system was determined by the underlying negative landscape gradient force and the nonequilibrium rotational flux. While the shape of the Wu-Xing landscape determines the stabilities of the states, the rotational flux guarantees the persistent periodic oscillation and the stability of the flow. This provides a physical and quantitative basis for Yin–Yang duality of the driving forces for determining the dynamics and behaviors of the living systems. Applying landscape and flux analysis, we can identify the key parameter for the dynamics/function of Wu-Xing network. These findings allow us to have a deeper understanding of the scientific merits of the ancient Wu-Xing theory from the network motif perspective.

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“…In the context of adhesion, micropatterned surfaces commonly adhere better to smooth and even rough substrates as stresses at the contact interface are distributed more homogeneously and cracks are blunted upon detachment of single fibrils. − Furthermore, micropatterned surfaces show great potential for improving adhesion under wet conditions and underwater. − …”

Section: Introductionmentioning

confidence: 99%

Elastohydrodynamic Dewetting of Thin Liquid Films: Elucidating Underwater Adhesion of Topographically Patterned Surfaces

et al. 2020

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In underwater adhesion of a topographically patterned surface with a very soft material such as human skin, the elastic deformation can be large enough to achieve solid-on-solid contact not only on top of the hills but also in the valleys of the substrate topography. In this context, we have studied the dynamics of dewetting of a thin liquid film confined between a rigid, periodic micropillar array and a soft, elastic sphere. In our experiments, we observed two very distinct dewetting morphologies. For large ratios of array period to micropillar height and width, the dewetted areas tend to have a diamond-like shape and expand with a rate similar to a flat, unpatterned substrate. When the array period is reduced, the morphology of the dry spot becomes irregular and its expansion rate is significantly reduced. We developed a fully coupled numerical model of the dewetting process that reproduces the key features observed in experiments. Moreover, we performed contact mechanics simulations to characterize the deformation of the elastomer and the shape of the dewetted area in a unit cell of the micropillar array.

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Pillar versus dimple patterned surfaces for wettability and adhesion with varying scales

Cited by 9 publications

References 37 publications

Regulation and control of wet friction of soft materials using surface texturing: A review

Regulation and control of wet friction of soft materials using surface texturing: A review

The landscape and flux of a minimum network motif, Wu Xing*

Elastohydrodynamic Dewetting of Thin Liquid Films: Elucidating Underwater Adhesion of Topographically Patterned Surfaces

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