Jetting Micron-Scale Droplets onto Chemically Heterogeneous Surfaces

Léopoldès, J.; Dupuis, Alexandre; Bucknall, David G.; Yeomans, J. M.

doi:10.1021/la0353069

Cited by 102 publications

(103 citation statements)

References 27 publications

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“…This numerical approach has been shown to agree well with experiments in several cases [1,2,4], giving us confidence in using it for the more complicated situations considered here.…”

Section: Introductionsupporting

confidence: 69%

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Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Kusumaatmaja

Yeomans

2006

Langmuir

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We explore numerically the feasibility of using chemical patterning to control the size and polydispersity of micron-scale drops. The simulations suggest that it is possible to sort drops by size or wetting properties by using an array of hydrophilic stripes of different widths. We also demonstrate that monodisperse drops can be generated by exploiting the pinning of a drop on a hydrophilic stripe. Our results follow from using a lattice Boltzmann algorithm to solve the hydrodynamic equations of motion of the drops and demonstrate the applicability of this approach as a design tool for micofluidic devices with chemically patterned surfaces.

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“…This numerical approach has been shown to agree well with experiments in several cases [1,2,4], giving us confidence in using it for the more complicated situations considered here.…”

Section: Introductionsupporting

confidence: 69%

“…The behaviour of fluids spreading and moving across such surfaces is extremely rich, and is only just beginning to be explored [1,2,3,4,5,6,7,8,9,10,11]. Biosystems have evolved to use hydrophobic and hydrophilic patches to direct the motion of fluids at surfaces [12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Kusumaatmaja

Yeomans

2006

Langmuir

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“…The thermodynamic properties of the drop are input via the pressure tensor P which is calculated from the free energy [26,29,28] via…”

Section: Lattice Boltzmann Simulationsmentioning

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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“…Depending on the size of the pattern and the contact angle in the two domains, wetting transitions can occur in which the liquid droplet can change its shape or morphology [12,13]. The equilibrium shapes of liquid droplets on a variety of chemically patterned surfaces has been studied both experimentally and theoretically [14,15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Liquid Nanodroplets Spreading on Chemically Patterned Surfaces

2006

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Controlling the spatial distribution of liquid droplets on surfaces via surface energy patterning can be used to control material delivery to specified regions via selective liquid/solid wetting. While studies of the equilibrium shape of liquid droplets on heterogenous substrates exist, much less is known about the corresponding wetting kinetics. We make significant progress towards elucidating details of this topic by studying, via large-scale atomistic simulations, liquid nanodroplets spreading on chemically patterned surfaces. A model is presented for lines of polymer liquid (droplets) on substrates consisting of alternating strips of wetting (equilibrium contact angle θ 0 ≃ 0 • ) and nonwetting (θ 0 ≃ 90 • ) material. Droplet spreading is compared for different wavelength λ of the pattern and strength of surface interaction on the wetting strips. For small λ, droplets partially spread on both the wetting and non-wetting regions of the substrate to attain a finite contact angle less than 90 • . In this case, the extent of spreading depends on the interaction strength in the wetting regions. A transition is observed such that, for large λ, the droplet spreads only on the wetting region of the substrate by pulling material from non-wetting regions. In most cases, a precursor film spreads on the wetting portion of the substrate at a rate strongly dependent upon interaction strength.

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Jetting Micron-Scale Droplets onto Chemically Heterogeneous Surfaces

Cited by 102 publications

References 27 publications

Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Anisotropic Drop Morphologies on Corrugated Surfaces

Liquid Nanodroplets Spreading on Chemically Patterned Surfaces

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