Partial wetting of chemically patterned surfaces: The effect of drop size

Brandon, Simon; Haimovich, Nir; Yeger, Einat; Marmur, Abraham

doi:10.1016/s0021-9797(03)00285-6

Cited by 181 publications

(203 citation statements)

References 12 publications

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“…The problem of dynamic droplet volume variation has received some attention over the last few decades, both experimentally [28][29][30] and analytically-computationally, [31][32][33][34] which the droplet is kept fixed at a specific point on the surface, hence not allowing for any possible horizontal motion of the droplet. In this sense, the bifurcation diagram we present…”

Section: -17mentioning

confidence: 99%

Dynamics of Fattening and Thinning 2D Sessile Droplets

Pradas

Savva

Benziger³

et al. 2016

Langmuir

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We investigate the dynamics of a droplet on a planar substrate as the droplet volume changes dynamically due to liquid being pumped in or out through a pore. We adopt a diffuse-interface formulation which is appropriately modified to account for a localized inflow-outflow boundary condition (the pore) at the bottom of the droplet, hence allowing to dynamically control its volume, as the droplet moves on a flat substrate with a periodic chemical pattern. We find that the droplet undergoes a stick-slip 1 motion as the volume is increased (fattening droplet) which can be monitored by tracking the droplet contact points. If we then switch over to outflow conditions (thinning droplet) the droplet follows a different path (i.e. the distance of the droplet midpoint from the pore location evolves differently) giving rise to a hysteretic behavior. By means of geometrical arguments we are able to theoretically construct the full bifurcation diagram of the droplet equilibria (positions and droplet shapes) as the droplet volume is changed, finding excellent agreement with time-dependent computations of our diffuse-interface model.

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Section: -17mentioning

confidence: 99%

Dynamics of Fattening and Thinning 2D Sessile Droplets

Pradas

Savva

Benziger³

et al. 2016

Langmuir

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“…Both the Wenzel and Cassie equations apply to surfaces whose protrusions and/or heterogeneities are small in comparison with the size of liquid/ vapor interface. 36,42 If liquid does not penetrate into surface protrusions and is present on the air pockets or placed over a porous material such as fabric, …”

mentioning

confidence: 99%

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Drelich

Marmur

2014

Surface Innovations

Self Cite

157

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The terms superhydrophobicity and superhydrophilicity were introduced not very long ago, in 1996 and 2000, respectively.The former is used to describe exceptionally weak and the latter used to indicate strong interactions of materials and IntroductionAfter more than two centuries of research, capillarity and wetting phenomena still remain popular topics of investigation in many modern surface chemistry laboratories. Curiosity and fascination with rain droplets splashing in a puddle, water droplets decorating flowers, leaves of plants and fruits after rain or watering and colorful soap bubbles shaped at the end of wheat straw have never been stronger and go beyond scientific laboratories. Colorful images of liquid droplets and puddles, illustrating their behavior on a variety of surfaces, thrive in professional journals, popular magazines and Internet. However, terms such as wetting, spreading and contact angle are still puzzling to the layman and beginner researcher. To facilitate

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“…The critical importance of the triple line in the wetting behavior was shown by Gao and McCarthy [23], who found experimentally that CA of a droplet is defined solely by the triple line, while the roughness beneath the droplet is irrelevant. However, there are still many controversies regarding the conclusion of Gao and McCarthy.…”

Section: Introductionmentioning

confidence: 90%

“…But, even when the relative size of heterogeneities is very small, the droplet assumes an asymmetric irregular shape with the corrugated three-phase contact line (triple line) [13,14,[18][19][20], especially for the inhomogeneities represented by linear grooves, where the droplet behavior in parallel and perpendicular directions to the grooves is different [21]. However, if the size of inhomogeneities remains small as compared to the droplet size (micro-roughness), the corrugation of the triple line due to imperfections of the solid surface does not produce a significant discrepancy between measured CAs and those predicted by the Wenzel equation [14][15][16][17][22][23][24][25]. On the other hand, with a decrease in the droplet size relative to the size of surface roughness features, the predictive applicability of the Wenzel equation has often been observed to fail [26,27].…”

Section: Introductionmentioning

confidence: 99%

Droplet on a regularly patterned solid. Wenzel’s regime and meso-scale roughness

2015

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Abstract. The applicability of Wenzel's equation to describe a liquid droplet settled on the solid surface regularly patterned with rectangular prisms was examined by means of simulations of the droplet/surface system morphology and energetics. The droplet deposited on the meso-scale surface roughness (i.e. the droplet size was larger than the size of heterogeneities by about an order of magnitude) was considered. Several different approaches to the estimation of the contact angle were employed. The discrepancies between the results of simulated experimental measurements and the predictions based on the Wenzel equation were analyzed and discussed. The influence of three-phase contact line effects on the droplet morphology and the existence of metastable states was shown.

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Partial wetting of chemically patterned surfaces: The effect of drop size

Cited by 181 publications

References 12 publications

Dynamics of Fattening and Thinning 2D Sessile Droplets

Dynamics of Fattening and Thinning 2D Sessile Droplets

Physics and applications of superhydrophobic and superhydrophilic surfaces and coatings

Droplet on a regularly patterned solid. Wenzel’s regime and meso-scale roughness

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