Symmetric and Asymmetric Capillary Bridges between a Rough Surface and a Parallel Surface

Wang, Yongxin; Michielsen, Stephen; Lee, Hoon Joo

doi:10.1021/la401324f

Cited by 37 publications

(30 citation statements)

References 37 publications

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“…It is worth commenting on the fact that the thin CB generatrices converge to equations of circular peripheries, which follows from Eq. (5). The latter in the approximation of a thin CB, Δ + ≤ ≤ 1 1 x takes the form:…”

Section: Thin Liquid Bridgementioning

confidence: 99%

“…Interesting are the investigations of surface roughness influence on the CB behavior [5]. There have been attempts to develop methods for contact angles measurement between the liquid and two particles [6].…”

Section: Introductionmentioning

confidence: 99%

“…The interval of parameter values satisfying Eqs (5,7). should be conceived as the СВ definition domain.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Statics and dynamics of capillary bridges

Petkov

Radoev

2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The present theoretical and experimental investigations concern static and dynamic properties of capillary bridges (CB) without gravity deformations. Central to their theoretical treatment is the capillary bridge definition domain, i.e. the determination of the permitted limits of the bridge parameters. Concave and convex bridges exhibit significant differences in these limits. The numerical calculations, presented as isogones (lines connecting points, characterizing constant contact angle) reveal some unexpected features in the behaviour of the bridges. The experimental observations on static bridges confirm certain numerical results, while raising new problems of interest related to the stability of the equilibrium forms. The dynamic aspects of the investigation comprise the capillary attraction (thinning) of concave bridge. The thinning velocities at the onset of the process were determined. The capillary attraction, weight of the plates and viscous forces were shown to be the governing factors, while the inertia forces turned to be negligible.

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Section: Thin Liquid Bridgementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Statics and dynamics of capillary bridges

Petkov

Radoev

2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Due to the directional shear force, the morphology of the fibrous liquid bridge is asymmetric at the forward and the backward directions (Figure d, inset). Thus, the curved liquid film is liable to generate a Laplace pressure F 1 and F 2 ( F 2 > F 1 ), whose vertical components F 1–1 and F 2–1 are helpful to balance gravity F g . Here, the difference in the horizontal component between F 2–2 and F 1–2 ( F 2–2 > F 1–2 ) helps to propel the QDs moving to the forward direction, with a thin liquid film left behind.…”

Section: Summary Of the Performance Of The As‐prepared Qled Devices (mentioning

confidence: 99%

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High‐Performance QLEDs

Zhang

et al. 2019

Advanced Materials

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Solution processing is widely used for preparing quantum dot (QD) films for fabricating QD light‐emitting diode display (QLED) devices. However, current approaches suffer from either the coffee‐ring effect or a large amount of wasted solution, leading to low performance and high cost. Here, a facile approach guided by a fibrous liquid bridge is developed for the continuous and controllable transfer of QD solution into ultrasmooth films by using a taut fiber with its two ends placed into capillary tubes. Guided along the fiber, a liquid bridge is formed between the horizontal fiber and the substrate, with a large mass of liquid steadily being held within the vertically placed tubes. Directionally moving the liquid bridge generates a high‐quality QD film on the substrate. Particularly, the liquid consumption is quantitative, namely, in proportion to the area of the as‐prepared film. Moreover, multilayered ultrasmooth red/green/blue QD films are prepared by multiple transfers of liquid onto the same targeted area in sequence. The as‐prepared white QLEDs show a rather high performance with a maximum luminance of 57 190 cd m−2 and a maximum current efficiency of 15.868 cd A−1. It is envisioned that this strategy offers new perspectives for the low‐cost fabrication of high‐performance QLED devices.

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“…An atomic force microscope (AFM) probe technique was widely used to study the relationship between contact angle and roughness [ 23 , 24 ]. Contact angle directly affects the height of capillary bridge between solid surfaces and the capillary force [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Layer Stacked Clamping (LSC) for Polishing Ultra-Thin Sapphire Wafer

et al. 2020

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Double-sides polishing technology has the advantages of high flatness and parallelism, and high polishing efficiency. It is the preferred polishing method for the preparation of ultra-thin sapphire wafer. However, the clamping method is a fundamental problem which is currently difficult to solve. In this paper, a layer stacked clamping (LSC) method of ultra-thin sapphire wafer which was used on double-sides processing was proposed and the clamping mechanism of layer stacked clamping (LSC) was studied. Based on the rough surface contact model of fractal theory, combining the theory of van der Waals force and capillary force, the adhesion model of the rough surfaces was constructed, and the reliability of the model was verified through experiments. Research has found that after displacement between the two surfaces the main force of the adhesion force is capillary force. The capillary force decreases with the increasing of surface roughness, droplet volume, and contact angle. For an ultra-thin sapphire wafer with a diameter of 50.8 mm and a thickness of 0.17 mm, more than 1.4 N of normal adhesion force can be generated through the LSC method. Through the double-sides polishing experiment using the LSC method, an ultra-thin sapphire wafer with an average surface roughness (Ra) of 1.52 nm and a flatness (PV) of 0.968 μm was obtained.

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Symmetric and Asymmetric Capillary Bridges between a Rough Surface and a Parallel Surface

Cited by 37 publications

References 37 publications

Statics and dynamics of capillary bridges

Statics and dynamics of capillary bridges

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High‐Performance QLEDs

The Mechanism of Layer Stacked Clamping (LSC) for Polishing Ultra-Thin Sapphire Wafer

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