Slip-controlled thin-film dynamics

Fetzer, Renate; Rauscher, Markus; Münch, Andreas; Wagner, Barbara; Jacobs, Karin

doi:10.1209/epl/i2006-10160-3

Cited by 58 publications

(67 citation statements)

References 29 publications

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“…9,12 The enhancement of the depletion layer with temperature is also contrary to the temperature dependent reduction of slip length observed in polystyrene on OTS. 28 Accordingly, the enhancement of the depleted layer contradicts the amount of surface slip. Thus, in addition to slip lengths calculated via formula (3), which are orders of magnitude smaller than the reported literature values, the opposite trend of the depletion effect with interfacial energy we observe shows that the presence of a depletion layer alone cannot explain surface slippage of hexadecane.…”

Section: Discussionmentioning

confidence: 99%

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Gutfreund

Wolff

Maccarini

et al. 2011

The Journal of Chemical Physics

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We present a neutron reflectivity study on interfaces in contact with flowing hexadecane, which is known to exhibit surface slip on functionalized solid surfaces. The single crystalline silicon substrates were either chemically cleaned Si(100) or Si(100) coated by octadecyl-trichlorosilane (OTS), which resulted in different interfacial energies. The liquid was sheared in situ and changes in reflectivity profiles were compared to the static case. For the OTS surface, the temperature dependence was also recorded. For both types of interfaces, density depletion of the liquid at the interface was observed. In the case of the bare Si substrate, shear load altered the structure of the depletion layer, whereas for the OTS covered surface no effect of shear was observed. Possible links between the depletion layer and surface slip are discussed. The results show that, in contrast to water, for hexadecane the enhancement of the depletion layer with temperature and interfacial energy reduces the amount of slip. Thus a density depletion cannot be the origin of surface slip in this system.

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Section: Discussionmentioning

confidence: 99%

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Gutfreund

Wolff

Maccarini

et al. 2011

The Journal of Chemical Physics

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“…From the dynamics of hole growth 27,28,34-40 as well as from the shape of the liquid rim surrounding the hole one can get information about the slip or no-slip boundary condition of the liquid close to the solid substrate. 17,41,42 In the late stage, the straight ribbons that separate two coalescing holes decay into droplets due to the Rayleigh-Plateau instability, 43 c.f. Fig.…”

Section: Experimental Model Systems For Simple Liquidsmentioning

confidence: 99%

Stability and Dewetting of Thin Liquid Films

Jacobs

Seemann

Herminghaus

2008

Series in Soft Condensed Matter

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The stability of thin liquid coatings is of fundamental interest in everyday life. Homogeneous and non-volatile liquid coatings may dewet either by heterogeneous nucleation, thermal nucleation, or spinodal dewetting. Wetting and dewetting is explained on a fundamental level, including a discussion of relevant interactions. This chapter will also address the various dewetting scenarios and explain how the effective interface potential governs the behavior obtained for various stratified substrates and film thicknesses.

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“…While the interface shape is monotonous at the bubble's advancing side, the thin film at the rear exhibits steady capillary waves, that are comoving with the bubble. The ripples are found in many other flow phenomena, for example in dip-coating processes, for both plunging and withdrawing plates (Wilson 1982;Snoeijer et al 2008;Maleki et al 2011), spreading droplets on a pre-wetted film (Tanner 1979;Tuck & Schwartz 1990;Cormier et al 2012;Bergemann et al 2018;Teisala et al 2018), dewetting fronts (Fetzer et al 2006;Snoeijer & Eggers 2010), and levelling of capillary films Salez et al 2012;Ilton et al 2016). Apart from their intrinsic interest, the ripples are important for establishing boundary conditions in coating problems (Bretherton 1961;Taroni et al 2012;Giavedoni & Saita 1999), and give rise to intricate bifurcation scenarios for the forced wetting transition (Ziegler et al 2009;Köpf & Thiele 2014;Lin et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Capillary ripples in thin viscous films

2019

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Capillary ripples on thin viscous films are important features of coating and lubrication flows. Here we present experiments based on Digital Holographic Microscopy, measuring the morphology of capillary ripples ahead of a viscous drop spreading on a prewetted surface with a nanoscale resolution. Our experiments reveal that upon increasing the spreading velocity, the amplitude of the ripples first increases and subsequently decreases. Above a critical spreading velocity, the ripples even disappear completely and this transition is accompanied by a divergence of the ripple wavelength. These observations are explained quantitatively using linear wave analysis, beyond the usual lubrication approximation, illustrating that new phenomena arise when the capillary number becomes order unity.

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Slip-controlled thin-film dynamics

Cited by 58 publications

References 29 publications

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Stability and Dewetting of Thin Liquid Films

Capillary ripples in thin viscous films

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