Imaging Liquid Structures on Inhomogeneous Surfaces by Scanning Force Microscopy

Pompe, Tilo; Fery, Andreas; Herminghaus, Stephan

doi:10.1021/la971262q

Cited by 74 publications

(51 citation statements)

References 19 publications

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“…The equilibrium contact line shown in Fig. 8b shows the pattern of the underlying substrate and agrees qualitatively with experimental results obtained by Pompe et al (1998). Figure 9 shows the evolution of a small hemispherical droplet spreading on heterogeneous surface with relative wider strips.…”

Section: Single Droplet Spanning Several Hydrophilic-hydrophobic Stripessupporting

confidence: 85%

Analysis of single droplet dynamics on striped surface domains using a lattice Boltzmann method

Chang

Alexander

2006

Microfluid Nanofluid

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In this paper, the behavior of a micron-scale fluid droplet on a heterogeneous surface is investigated using a two-phase lattice Boltzmann method (LBM). The two-phase LBM permits the simulation of the time dependent three-dimensional motion of a liquid droplet on solid surface patterned with hydrophobic and hydrophilic strips. A nearest-neighbor molecular interaction force is used to model the adhesive forces between the fluid and solid walls. The solid heterogeneous wall is a uniform hydrophilic substrate painted with hydrophobic strips. The model is validated by demonstrating the consistency of the simulation results with an exact solution for capillary rise and through qualitative comparison of computed dynamic contact line behavior with experimentally measured surface properties and observed surface shapes of a droplet on a heterogeneous surface. The dependence of spreading behavior on wettability, the width of hydrophobic strip, initial location of the droplet relative to the strips, and gravity is investigated. A decrease in contact angle of the liquid on a hydrophilic surface may lead to breakup of the droplet for certain substrate patterns. The simulations suggest that the present lattice Boltzmann (LB) model can be used as a reliable way to study fluidic control on heterogeneous surfaces and other wetting related subjects.

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Section: Single Droplet Spanning Several Hydrophilic-hydrophobic Stripessupporting

confidence: 85%

Analysis of single droplet dynamics on striped surface domains using a lattice Boltzmann method

Chang

Alexander

2006

Microfluid Nanofluid

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“…The equilibrium shape of the contact line shown in fig. 4(b) reflects the pattern of the underlying substrate which is comparable to that found in laboratory experiments [20].…”

Section: Spreading On Heterogeneous Surfacessupporting

confidence: 77%

Droplet Spreading on Heterogeneous Surfaces Using a Three-Dimensional Lattice Boltzmann Model

Dupuis

Briant

Pooley

et al. 2003

Lecture Notes in Computer Science

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Abstract. We use a three-dimensional lattice Boltzmann model to investigate the spreading of mesoscale droplets on homogeneous and heterogeneous surfaces. On a homogeneous substrate the base radius of the droplet grows with time as t 0.28 for a range of viscosities and surface tensions. The time evolutions collapse onto a single curve as a function of a dimensionless time. On a surface comprising of alternate hydrophobic and hydrophilic stripes the wetting velocity is anisotropic and the equilibrium shape of the droplet reflects the wetting properties of the underlying substrate.

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“…On appropriately chosen structured substrates the precise determination of the line tension becomes possible via the accurate measurements of droplet morphologies. [13] Furthermore, due to the various control possibilities a systematic investigation of the dynamics of (de)wetting is possible. For example, the stages of the dynamics can be experimentally ªfreeze-framedº by, for example, solidifying the system.…”

Section: Discussionmentioning

confidence: 99%

Wetting Phenomena on Structured Surfaces

Lenz¹

1999

Adv. Mater.

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Wetting phenomena on structured surfaces are reviewed. The interplay between the two-dimensional pattern of surface domains and the three-dimensional morphology of the wetting fluid is theoretically discussed. The results presented illustrate the novel morphological aspects in the wetting behavior. It is shown that these systems have potential both as models for fundamental research and as a templates for technologically relevant microscale structures with unique geometric and topological properties.

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Imaging Liquid Structures on Inhomogeneous Surfaces by Scanning Force Microscopy

Cited by 74 publications

References 19 publications

Analysis of single droplet dynamics on striped surface domains using a lattice Boltzmann method

Analysis of single droplet dynamics on striped surface domains using a lattice Boltzmann method

Droplet Spreading on Heterogeneous Surfaces Using a Three-Dimensional Lattice Boltzmann Model

Wetting Phenomena on Structured Surfaces

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