Superspreading driven by Marangoni flow

Nikolov, Alex; Wasan, Darsh T.; Chengara, Anoop; Koczó, Kálmán; Policello, George A.; Kolossváry, István

doi:10.1016/s0001-8686(01)00087-2

Cited by 195 publications

(199 citation statements)

References 8 publications

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“…Thus, in a similar manner to topographic enhancement of the capillary drive for spreading to obtain a superspreading law, a voltage-induced superspreading should be achievable on what would be a partial wetting surface in the absence of a voltage. It also provides an alternative to the use of surfactants to both induce wetting of a surface that would not normally wet (that is, superwetting), and to increase the rate of spreading (that is, superspreading) on surfaces [20][21][22][23][24][25][26][27] . Voltage-induced spreading of dielectric liquid stripes.…”

Section: Resultsmentioning

confidence: 99%

Voltage-induced spreading and superspreading of liquids

2013

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The ability to quickly spread a liquid across a surface and form a film is fundamental for a diverse range of technological processes, including printing, painting and spraying. Here we show that liquid dielectrophoresis or electrowetting can produce wetting on normally nonwetting surfaces, without needing modification of the surface topography or chemistry. Additionally, superspreading can be achieved without needing surfactants in the liquid. Here we use a modified Hoffman-de Gennes law to predict three distinct spreading regimes: exponential approach to an equilibrium shape, spreading to complete wetting obeying a Tanner's law-type relationship and superspreading towards a complete wetting film. We demonstrate quantitative experimental agreement with these predictions using dielectrophoresis-induced spreading of stripes of 1,2 propylene glycol. Our findings show how the rate of spreading of a partial wetting system can be controlled using uniform and non-uniform electric fields and how to induce more rapid superspreading using voltage control.

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Section: Resultsmentioning

confidence: 99%

Voltage-induced spreading and superspreading of liquids

2013

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“…However, there is a possibility that Marangoni flow [13] is also an essential contribution to the superspreading phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Mixtures of catanionic surfactants can be superspreaders: Comparison with trisiloxane superspreader

Kovalchuk

Barton

Trybała

et al. 2015

Journal of Colloid and Interface Science

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“…Even with a low concentration (0.1 wt%), the surface tension of aqueous trisiloxane solutions is significantly lower (~22 mN/m) than that of pure water (~72 mN/m) and therefore the wetting ability of such solutions is dramatically improved [28]. A number of studies have been performed to investigate spontaneous wetting of hydrophobic surfaces by aqueous trisiloxane solutions [28][29][30][31]. During the drop impact process, surfactants could prevent the drop from recoiling and bouncing, thus enhancing the deposition efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comparison of spontaneous wetting and drop impact dynamics of aqueous surfactant solutions on hydrophobic polypropylene surfaces: scaling of the contact radius

2014

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In this paper, we comparatively investigated the spontaneous wetting and the impact dynamics of surfactantladen drops on hydrophobic polypropylene surfaces. We used the organic anionic surfactant sodium dodecyl sulfate (SDS) and two silicone-based nonionic surfactants, one of which was a so-called superspreader. The wetting dynamics during spontaneous spreading could be divided into an early inertiadominated stage and a later viscosity-dominated stage. Both could be described by power laws with different exponents. Further, wetting dynamics during the faster inertial stage was independent of surfactant properties, while surfactants played a role in the slower viscous stage. During drop impact, regardless of the impact speed the early wetting stage was controlled by inertial and capillary forces only. But, different from spontaneous spreading, surfactants influenced the wetting dynamics of this early stage. After the drops reached the maximum spreading radius r max they started recoiling and reducing again their contact radius. We observed, however, that despite reducing the static surface tension of the water drops, not all surfactants promoted them to spread out to a larger radius than the pure water drops during the early impact stage. We thus introduced a new time scale, τ ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi ρr 3 max =γ p , that uses the maximum spreading radius of the drops upon impact and that allows rescaling the durations of the inertial wetting stages to a universal master curve. Finally, we observed that only those drops containing superspreader restarted wetting the surface after recoiling, but the dynamics is not yet completely clear.

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Superspreading driven by Marangoni flow

Cited by 195 publications

References 8 publications

Voltage-induced spreading and superspreading of liquids

Voltage-induced spreading and superspreading of liquids

Mixtures of catanionic surfactants can be superspreaders: Comparison with trisiloxane superspreader

Comparison of spontaneous wetting and drop impact dynamics of aqueous surfactant solutions on hydrophobic polypropylene surfaces: scaling of the contact radius

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