Liquid transfer mechanism between two surfaces and the role of contact angles

Chen, H.; Tang, Tian; Amirfazli, Alidad

doi:10.1039/c4sm00075g

Cited by 47 publications

(49 citation statements)

References 15 publications

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“…Then, the analytical solution of the bridge meridian curve, given by Eq. (22), was fitted to the extracted interfaces. The unknown parameters (Q, τ 0 , τ 1 , a) were determined by minimizing the root-mean-squared normal distances between the extracted interface pixels and the theoretical meridian curve.…”

Section: Feature Extractionmentioning

confidence: 99%

“…Similarly to Qian and Breuer 25 , experiments were conducted in a liquid-gas system where the gravity effect is alleviated by small bridge dimensions. Using similar experiments, Chen et al 22 examined bridge breakup, showing that the liquid transfer ratio is correlated with the difference between the receding contact angles on the plates.…”

mentioning

confidence: 99%

“…Quantifying liquid-bridge and jet breakup upon stability loss dates to the works of Plateau 15 and Rayleigh 16 , 17 . While early investigations of crystal growth and purification focused on determining the minimum liquid volume that can be held between circular discs 18,19 , the drop-size distribution following breakup is of prime interest in contact-drop dispensing and liquid-transfer applications [20][21][22] . Minimizing the dispensed-drop size relative to the needle diameter is central to surface patterning based on direct-write lithographic techniques 3,23 .…”

Section: Introductionmentioning

confidence: 99%

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Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

Akbari

Hill

2016

Soft Matter

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We study the stability and breakup of liquid bridges with a free contact line on surfaces with contact-angle hysteresis (CAH) under zero-gravity conditions. Non-ideal surfaces exhibit CAH because of surface imperfections, by which the constraints on three-phase contact lines are influenced. Given that interfacial instabilities are constraintsensitive, understanding how CAH affects the stability and breakup of liquid bridges is crucial for predicting the drop size in contact-drop dispensing. Unlike ideal surfaces on which contact lines are always free irrespective of surface wettability, contact lines may undergo transitions from pinned to free and vice-versa during drop deposition on non-ideal surfaces. Here, we experimentally and theoretically examine how stability and breakup are affected by CAH, highlighting cases where stability is lost during a transition from a pinned-pinned (more constrained) to pinned-free (less constrained) interface-rather than a critical state. This provides a practical means of expediting or delaying stability loss. We also demonstrate how the dynamic contact angle can control the contact-line radius following stability loss. *

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Section: Feature Extractionmentioning

confidence: 99%

mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

Akbari

Hill

2016

Soft Matter

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“…They suggested that the total adhesion force consists of two components: a pressure difference DP across the liquid-gas interface and liquid-gas interfacial tension acting along the perimeter of the liquid contact base. More recently, Chen et al [28][29][30][31] demonstrated the importance of contact angles, contact angle hysteresis and the pinning of the contact line in the analysis of capillary and surface tension forces holding a liquid bridge between two surfaces. All studies were restricted, however, to smooth surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, curiosity on the meaning of apparent contact angles, such as advancing and receding contact angles, and contact angle hysteresis drives scientific debate and research in this area. [28][29][30][31][32][33][34] Progress is also driven by the fact that it became possible in recent years to measure the adhesion between a liquid droplet and a solid surface directly using a microbalance or other force-measuring systems. For example, Liu et al 35 studied the interaction between a liquid droplet and a series of gold substrates with wettability gradient by using a microbalance, and they found that the adhesion force decreases as the contact angle increases.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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A microelectronic balance system was employed to measure the force of spreading (snap-in force) during water droplet attachment and spreading on polymer surfaces and the water-polymer adhesion forces (maximum adhesion and pulloff forces) after droplet compression, retreat and detachment. Equipped with a charge-coupled device camera and data acquisition software, the instrument measured directly the forces; monitored droplet-surface separation, including distances over which droplet stretched; and collected optical images simultaneously. The images were used to analyze capillary and surface tension forces based on measured droplet shape, surface curvature, droplet base radius and values of contact angles. The forces measured with the microbalance were compared to calculated capillary/surface tension forces. Nearly excellent agreement between directly measured and calculated forces was verified for polymers with smooth surfaces. Experiments with patterned polymers with pores and pillars revealed that interpretation of forces requires knowledge of a triple-contact-line characteristic. One relevant parameter, named normalized contact line length, was introduced to surface tension forces to quantify forces measured directly with a microbalance.

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Visualization and simulation of the transfer process of index‐matched silica microparticle inks for gravure printing

Boelens

Pablo

Lim³

et al. 2016

AIChE Journal

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A combined experimental and computational study of the transfer of transparent index‐matched silica‐particle inks between two flat plates is presented for gravure printing applications. The influence of printing speed and initial ink droplet size on the ability to accurately transfer ink during the printing process is explored systematically. Smooth interface volume of fluid simulations show the same trends as the ink transfer observed in experiments over a wide range of printing speeds and for inks having different silica particle loadings. Our calculations indicate that for ink droplets with characteristic dimensions in the vicinity of 10 μm, which are of particular interest for gravure printing applications, ink transfer improves significantly due to the diminishing effect of gravity, and the increased importance of capillary forces at small length scales. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1419–1429, 2017

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Liquid transfer mechanism between two surfaces and the role of contact angles

Cited by 47 publications

References 15 publications

Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

Liquid-bridge stability and breakup on surfaces with contact-angle hysteresis

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Visualization and simulation of the transfer process of index‐matched silica microparticle inks for gravure printing

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