Early stage spreading: Mechanisms of rapid contact line advance

Webb, Edmund B.; Shi, Baiou

doi:10.1016/j.cocis.2014.10.001

Cited by 7 publications

(2 citation statements)

References 63 publications

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“…The understanding of the physics of a moving contact line, the intersection of a fluid interface and a solid, is still evolving (See the recent reviews 15–17 ). It is a classical problem in fluid dynamics that the equations for viscous flow produce a non-integrable singularity of the viscous stress at the wall 18 .…”

Section: Introductionmentioning

confidence: 99%

Revealing How Topography of Surface Microstructures Alters Capillary Spreading

Lee

Matsushima

Yada

et al. 2019

Sci Rep

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Wetting phenomena, i.e. the spreading of a liquid over a dry solid surface, are important for understanding how plants and insects imbibe water and moisture and for miniaturization in chemistry and biotechnology, among other examples. They pose fundamental challenges and possibilities, especially in dynamic situations. The surface chemistry and micro-scale roughness may determine the macroscopic spreading flow. The question here is how dynamic wetting depends on the topography of the substrate, i.e. the actual geometry of the roughness elements. To this end, we have formulated a toy model that accounts for the roughness shape, which is tested against a series of spreading experiments made on asymmetric sawtooth surface structures. The spreading speed in different directions relative to the surface pattern is found to be well described by the toy model. The toy model also shows the mechanism by which the shape of the roughness together with the line friction determines the observed slowing down of the spreading.

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Section: Introductionmentioning

confidence: 99%

Revealing How Topography of Surface Microstructures Alters Capillary Spreading

Lee

Matsushima

Yada

et al. 2019

Sci Rep

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“…In addition, early-time spreading follows the power-law rs=Cta where rnormals is the spreading radius of the droplet (see also Figure 1), C and a is the prefactor and the exponent, respectively. We report that on completely wetting surfaces, a approaches the value of 0.5 [3,4]. Dynamic control of spreading behavior, by means of in situ controlling the parameters a and C , requires, however, the application of an external force.…”

Section: Introductionmentioning

confidence: 99%

Highlighting the Role of Dielectric Thickness and Surface Topography on Electrospreading Dynamics

Chamakos¹,

Sema²,

Papathanasiou³

2019

Micromachines

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The electrospreading behavior of a liquid drop on a solid surface is of fundamental interest in many technological processes. Here we study the effect of the solid topography as well as the dielectric thickness on the dynamics of electrostatically-induced spreading by performing experiments and simulations. In particular, we use an efficient continuum-level modeling approach which accounts for the solid substrate and the electric field distribution coupled with the liquid interfacial shape. Although spreading dynamics depend on the solid surface topography, when voltage is applied electrospreading is independent of the geometric details of the substrate but highly depends on the solid dielectric thickness. In particular, electrospreading dynamics are accelerated with thicker dielectrics. The latter comes to be added to our recent work by Kavousanakis et al., Langmuir, 2018, which also highlights the key role of the dielectric thickness on electrowetting-related phenomena.

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