Canthotaxis/Wetting Barriers/Pinning Lines

Langbein, D.

doi:10.1007/3-540-45267-2_7

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…A droplet deposited on such a surface shows a natural tendency to pinning to physical or chemical heterogenities. 13 Because of the pinning effect, the droplet shows anisotropy of shape. 14 Along the pinning line, the angle made by the surface of the solid and the plane tangent to the droplet surface takes a different value than the Young contact angle θ Y .…”

Section: Introductionmentioning

confidence: 99%

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Morphological Transitions of Droplets Wetting a Series of Triangular Grooves

Dokowicz

Nowicki

2016

Langmuir

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Morphology and thermodynamics of a microdroplet deposited on a grooved inhomogeneous surface with triangular cross section of the grooves were studied by computer simulations with the use of Surface Evolver program. With increasing volume of the droplet, it initially spreads along the series of grooves assuming the filament-like morphology. After reaching a certain volume, the surface wetted by the droplet is reduced and the droplet assumes the bulge morphology or spreads over the surface bordering on the groove initially occupied (it can be either a neighboring groove or a flat surface). The character of the process is determined by the geometry of the edge of the inhomogeneity studied. The effect described also depends on the number of grooves G and the Young contact angle θY. The change in the shape of the droplet becomes more pronounced with decreasing θY and G. Above a certain number of grooves, in the range of contact angles studied (e.g., G > 6 if θY = 70° and G > 4 if θY = 75°), no morphological transition of the droplet was observed.

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Section: Introductionmentioning

confidence: 99%

“…14 Along the pinning line, the angle made by the surface of the solid and the plane tangent to the droplet surface takes a different value than the Young contact angle θ Y . This angle is called the pinning angle ϕ, and its value varies in the range determined by the canthotaxis condition 13 θ ϕ π β θ…”

Section: Introductionmentioning

confidence: 99%

Morphological Transitions of Droplets Wetting a Series of Triangular Grooves

Dokowicz

Nowicki

2016

Langmuir

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“…Different chemical compositions determined the wetting barrier at the interphase boundary between the hydrophilic and hydrophobic region. At this wetting barrier, the liquid surface turned from the contact angle with the better-wetting face to the contact angle with the worse-wetting face . Therefore, in regime 2, the contact radius kept constant as R and the apparent contact angle (ACA) was in a closed interval [θ β , θ α ].…”

Section: Resultsmentioning

confidence: 99%

Drop Capturing Based on Patterned Substrate in Space

Ding

Sun

et al. 2018

Langmuir

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In this work, we introduced a method for capturing aqueous drop based on a patterned substrate in space. Through the manipulation test of a colloidal drop, it could be verified that this patterned substrate had excellent control ability for aqueous drop in microgravity condition. The confinement mechanism of this substrate was clarified, which showed that drops with different volume could be pinned and attracted at a given area on the substrate. The confinement capability was related to the gravity effect, and the patterned substrate could confine aqueous drops with larger volume under microgravity than in normal gravity. With advantages of simple operation and strong capability to control large drops, this technique exhibited the wide application prospect in the fields of fluid management, biosensing, and pharmacy in microgravity condition in the future.

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“…This is known as the "wetting angle" (Langbein, 2002;Bonn et al, 2009). Under a specific gas atmosphere, the size of the wetting angle is affected only by the surface tension between the liquid and the solid (Langbein, 2002;Bonn et al, 2009;Pozrikidis, 2012;Oliver et al, 1977).…”

Section: Characterizationsmentioning

confidence: 99%

“…1, when the triple contact line slips on the structured surface and reaches the point where the wettability changes, then the triple contact line will be pinned and the contact angle will be changed. This is known as "canthotaxis" Herminghaus et al, 2008;Liu et al, 2012;Langbein, 2002). If the liquid is static in region I or II, then the contact angles will be θ r or θ a , respectively.…”

Section: Characterizationsmentioning

confidence: 99%

Shape and force analysis of capillary bridge between two slender structured surfaces

Zhu

Jia

et al. 2015

Mech. Sci.

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Abstract. When a capillary bridge of a constant volume is formed between two surfaces, the shape of the liquid bridge will change as the separation between those surfaces is varied. To investigate the variable forces and Laplace pressure of the capillary bridge, as the shape the bridge evolves, a pseudo-three-dimensional force model of the capillary bridge is developed. Based on the characteristics of the slender structured surface, an efficient method is employed to directly solve the differential equations defining the shape of the capillary bridge. The spacing between the plates satisfying the liquid confined within the hydrophobic region of the structured surface is calculated. The method described in this paper can prevent meshing liquid surfaces such that, compared with Surface Evolver simulations, the computing speed is greatly improved. Finally, by comparing the results of the finite element simulations performed with Surface Evolver with those of the method employed in this paper, the practicality of the method is demonstrated.

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Canthotaxis/Wetting Barriers/Pinning Lines

Cited by 7 publications

References 3 publications

Morphological Transitions of Droplets Wetting a Series of Triangular Grooves

Morphological Transitions of Droplets Wetting a Series of Triangular Grooves

Drop Capturing Based on Patterned Substrate in Space

Shape and force analysis of capillary bridge between two slender structured surfaces

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