Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Kusumaatmaja, Halim; Yeomans, J. M.

doi:10.1021/la062082w

Cited by 38 publications

(35 citation statements)

References 35 publications

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“…* huanghb@ustc.edu.cn Due to mesoscopic property, the above multiphase LBMs have some advantages over conventional methods for multiphase flows [28][29][30][31][32]. Hence, they are also used to model contact line dynamics [29][30][31][32]. With the Shan-Chen model, Kang et al studied 2D droplets sliding on smooth walls and investigated effects of the wettability, Bond number, droplet size, and density and viscosity ratios of two phases [14].…”

Section: Introductionmentioning

confidence: 99%

Scheme for contact angle and its hysteresis in a multiphase lattice Boltzmann method

Wang

Huang

2013

Phys. Rev. E

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In this paper, a scheme for specifying contact angle and its hysteresis is incorporated into a multiphase lattice Boltzmann method. The scheme is validated through investigations of the dynamic behaviors of a droplet sliding along two kinds of walls: a smooth (ideal) wall and a rough or chemically inhomogeneous (nonideal) wall. For an ideal wall, the wettability of solid substrates is able to be prescribed. For a nonideal wall, arbitrary contact angle hysteresis can be obtained through adjusting advancing and receding angles. Significantly different phenomena can be recovered for the two kinds of walls. For instance, a droplet on an inclined ideal wall under gravity is impossible to stay stationary. However, the droplet on a nonideal wall may be pinned due to contact angle hysteresis. The steady interface shapes of the droplet on an inclined nonideal wall under gravity or in a shear flow quantitatively agree well with the previous numerical studies. Besides, the complex motion of a droplet creeping like an inchworm could be simulated. The scheme is found suitable for the study of contact line problems with and without contact angle hysteresis.

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Section: Introductionmentioning

confidence: 99%

Scheme for contact angle and its hysteresis in a multiphase lattice Boltzmann method

Wang

Huang

2013

Phys. Rev. E

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“…Regular arrays of chemical patches [4,5,6] and posts [7,8,9,10] of different shapes and sizes are regularly fabricated and several authors [11,12,13] have even shown the possibilities of manufacturing multi-scale surface patterns. Recently such patterning has been used to control the movement of drops [16,17] and to attempt to enhance flow in microchannels [18,19].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Drop Morphologies on Corrugated Surfaces

et al. 2008

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The spreading of liquid drops on surfaces corrugated with micron-scale parallel grooves is studied both experimentally and numerically. Because of the surface patterning, the typical final drop shape is no longer spherical. The elongation direction can be either parallel or perpendicular to the direction of the grooves, depending on the initial drop conditions. We interpret this result as a consequence of both the anisotropy of the contact line movement over the surface and the difference in the motion of the advancing and receding contact lines. Parallel to the grooves, we find little hysteresis due to the surface patterning and that the average contact angle approximately conforms to Wenzel's law as long as the drop radius is much larger than the typical length scale of the grooves.

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“…In the first [55], we show how a (relatively) hydrophobic grid can be used to alleviate mottle [56] in ink-jet printing. In the second example, we demonstrate that chemical patterning can be used to control drop size and polydispersity [57]. Figure 11.8 compares experiments and simulations of drops on a chemically patterned substrate.…”

Section: Chemical Patterningmentioning

confidence: 91%