A deeper insight into the dip coating process in the presence of insoluble surfactants: A numerical analysis

Campana, Diego Martin; Ubal, Sebastian; Giavedoni, Maria Delia; Saita, Fernando A.

doi:10.1063/1.3589346

Cited by 16 publications

(16 citation statements)

References 14 publications

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“…Different authors ( [55,57,25,24,58,50] among others) proposed numerical simulations of the effect of Gibbs-Marangoni elasticity by integrating the Stokes equation together with the boundary condition given by Eq. (10) containing only the second term on the right-hand.…”

Section: Effect Of the Gibbs-marangoni Elasticitymentioning

confidence: 99%

Withdrawing a solid from a bath: How much liquid is coated?

Rio

Boulogne

2017

Advances in Colloid and Interface Science

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A solid withdrawn from a liquid bath entrains a film. In this review, after recalling the predictions and results for pure Newtonian liquids coated on simple solids, we analyze the deviations to this ideal case exploring successively three potential sources of complexity: the liquid-air interface, the bulk rheological properties of the liquid and the mechanical or chemical properties of the solid. For these different complexities, we show that significant effects on the film thickness are observed experimentally and we summarize the theoretical analysis presented in the literature, which attempt to rationalize these measurements.

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Section: Effect Of the Gibbs-marangoni Elasticitymentioning

confidence: 99%

Withdrawing a solid from a bath: How much liquid is coated?

Rio

Boulogne

2017

Advances in Colloid and Interface Science

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“…Similarly, the effects of surface elasticity induced by the presence of surfactants have been studied in several configurations, e.g. liquid threads (Craster et al 2002;Timmermans & Lister 2002), dip coating (Campana et al 2011;Seiwert et al 2014;Champougny et al 2015), bubbles immersed in a viscous medium (Hameed et al 2008) or drop deformation and breakup (Stone & Leal 1990;Milliken et al 1993).…”

Section: Introductionmentioning

confidence: 99%

Temporal stability of free liquid threads with surface viscoelasticity

Martínez-Calvo

Sevilla

2018

J. Fluid Mech.

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We analyse the effect of surface viscoelasticity on the temporal stability of a free cylindrical liquid jet coated with insoluble surfactant, extending the results of Timmermans & Lister (2002). Our development requires, in particular, deriving the correct expressions for the normal and tangential stress boundary conditions at a general axisymmetric interface when surface viscosity is modelled with the Boussinesq-Scriven constitutive equation. These stress conditions are applied to obtain a new dispersion relation for the liquid thread, which is solved to describe its temporal stability as a function of four governing parameters, namely the capillary Reynolds number, the elasticity parameter, and the shear and dilatational Boussinesq numbers. It is shown that both surface viscosities have a stabilising influence for all values of the capillary Reynolds number and elasticity parameter, the effect being more pronounced at low capillary Reynolds numbers. The wavenumber of maximum amplification depends non-monotonically on the Boussinesq numbers, especially for very viscous threads at low values of the elasticity parameter. Finally, two different lubrication approximations of the equations of motion are derived. While the validity of the leading-order model is limited to small enough values of the elasticity parameter and of the Boussinesq numbers, a higher-order parabolic model is able to accurately capture the linearised behaviour for the whole range of values of the four control parameters.

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“…We believe that this is because the charge transfer through the NiO film and the charge collection at the TCS/NiO film interface were the most efficient with this sample. [27,28] Experimental Section provement in the photoelectrochemical performance of p-type electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…[25,26] Finally, microwave thermal treatments can easily be combined with plasma to achieve the uniform heating of coatings on large-area substrates. [27,28] Experimental Section…”

Section: Introductionmentioning

confidence: 99%