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Соболева, О. А.; Summ, B. D.

doi:10.1023/a:1022379210765

Cited by 21 publications

(15 citation statements)

References 10 publications

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“…All drops spread spontaneously after they contacted the PP surfaces. Figure 2a shows the log-log representation of the spreading radius r normalized by initial drop radius r 0 as a function of the spreading time t, and indicates that the early wetting dynamics (t≲12 ms) of aqueous surfactant solutions follows a power law [3,[5][6][7]. The wetting exponent is~1/3 for pure water, which is consistent with values on hydrophobic surfaces in previous studies [3,7].…”

Section: Inertia-dominated Wetting Stagesupporting

confidence: 84%

“…In recent years, investigating the initial milliseconds of this spontaneous wetting process was made possible due to the rapid development of high-speed imaging techniques [3,4]. All experimental and theoretical investigations of drop spreading concluded that the initial wetting is mainly dominated by inertia, while the later wetting is dominated by viscous forces [3][4][5][6][7]. By an energy balance, Bird et al [3] proposed a scaling power law between spreading radius r and spreading time t, r∝t α .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Inertia-dominated Wetting Stagesupporting

confidence: 84%

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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“…That is, kinetics of spreading and evaporation of surfactant solutions is one of very important problems in the area. It was mentioned above that experimental investigation started only recently [13] and since then the area attracts a considerable attention ever since [48]. Kinetics of spreading and simultaneous evaporation has been investigated experimentally in the case of mixture of two liquids [49]; however a theoretical understanding in this case is to be developed.…”

Section: Simultaneous Spreading and Evaporationmentioning

confidence: 99%

Surface forces action in a vicinity of three phase contact line and other current problems in kinetics of wetting and spreading

Starov

2010

Advances in Colloid and Interface Science

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“…18 A few experimental and theoretical studies of spreading drops have shown, however, that an inertial regime exists ahead of the viscous regime. [19][20][21] This early stage of spreading lasts only a few milliseconds and, for completely wetting surfaces, it is as well described by a power law. The exponent of the power law is as high as 1/2.…”

Section: Introductionmentioning

confidence: 99%

Short time wetting dynamics on soft surfaces

2011

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The wetting of solid surfaces by fluids has been studied for more than two centuries. However, it was only in recent years that investigations of the first milliseconds of spontaneous drop spreading on solid surfaces started. For non-deformable surfaces, this fast dynamic wetting process is known to be dominated by inertia and controlled by surface wettability. In this work we studied spontaneous spreading of liquids on soft, viscoelastic rubber films with shear moduli |G| between 0.2 and 510 kPa and thickness d between 30 and 160 mm. We found that the early stage of fast wetting of soft surfaces is also dominated by inertia and that the wetting dynamics follows a power law which mainly depends on wettability, but not on softness. This finding allows us to apply fast dynamic wetting measurements for inferring the equilibrium contact angle q eq on soft surfaces. On such surfaces static contact angle measurements with sessile drops would not yield univocal results and Young's equation is not directly applicable. On the other hand, the duration of the fast inertial wetting is controlled by surface softness. This is an indication of a viscoelastic dissipation process occurring during wetting that starts after some characteristic time dependent on the surface tension of the liquid, on the viscosity of the surface, and on the speed of wetting.

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Cited by 21 publications

References 10 publications

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

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

Surface forces action in a vicinity of three phase contact line and other current problems in kinetics of wetting and spreading

Short time wetting dynamics on soft surfaces

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