A computational study of the influence of viscoelasticity on the interfacial dynamics of dip coating flow

Abedijaberi, Arash; Bhatara, Gandharv; Shaqfeh, Eric S. G.; Khomami, Bamin

doi:10.1016/j.jnnfm.2011.03.002

Cited by 16 publications

(8 citation statements)

References 46 publications

(96 reference statements)

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“…The thickness, h wet , of the dip-coated liquid film, called the wet film thickness, is controlled by the interplay of surface tension and gravity, which oppose film formation, and viscous forces, which draw liquid from the coating bath onto the substrate. ,, Whereas surface tension and gravity are process-independent, viscous forces can be controlled by the withdrawal speed u and solution CNT concentration (which affects viscosity). CNT concentration also affects the dry film thickness through h wet = h dry ϕ, where ϕ is the CNT volume fraction in the coating liquid.…”

Section: Resultsmentioning

confidence: 99%

High-Performance Carbon Nanotube Transparent Conductive Films by Scalable Dip Coating

et al. 2012

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Transparent conductive carbon nanotube (CNT) films were fabricated by dip-coating solutions of pristine CNTs dissolved in chlorosulfonic acid (CSA) and then removing the CSA. The film performance and morphology (including alignment) were controlled by the CNT length, solution concentration, coating speed, and level of doping. Using long CNTs (∼10 μm), uniform films were produced with excellent optoelectrical performance (∼100 Ω/sq sheet resistance at ∼90% transmittance in the visible), in the range of applied interest for touch screens and flexible electronics. This technique has potential for commercialization because it preserves the length and quality of the CNTs (leading to enhanced film performance) and operates at high CNT concentration and coating speed without using surfactants (decreasing production costs).

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Section: Resultsmentioning

confidence: 99%

High-Performance Carbon Nanotube Transparent Conductive Films by Scalable Dip Coating

et al. 2012

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“…The experiments were also compared with the predictions of lubrication theory of power-law fluids [35,36]. Other studies on non-newtonian effects focused on coating flows [37,38,39,40] and moving contact lines [25,26,41,42,43], both experi-mentally [25,26,41,42] and numerically/theoretically [43,44,45]. Garoff and co-workers [25,26,41,42] conducted a series of experiments on dynamic wetting: by comparing the steady interface shape, they observed that the non-newtonian effect was confined to the close vicinity of the contact line.…”

Section: Introductionmentioning

confidence: 99%

Sliding droplets of Xanthan solutions: A joint experimental and numerical study

2015

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Abstract. We have investigated the sliding of droplets made of solutions of Xanthan, a stiff rodlike polysaccharide exhibiting a non-newtonian behavior, notably characterized by a shear-rate dependence of the viscosity. These experimental results are quantitatively compared with those of newtonian fluids (water). The impact of the non-newtonian behavior on the sliding process was shown through the relation between the average dimensionless velocity (i.e. the Capillary number) and the dimensionless volume forces (i.e. the Bond number). To this aim, it is needed to define operative strategies to compute the Capillary number for the shear thinning fluids and compare with the corresponding newtonian case. Results from experiments were complemented with lattice Boltzmann numerical simulations of sliding droplets, aimed to disentangle the influence that non-newtonian flow properties have on the sliding.

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“…When this occurs, the film becomes uniform and stable. Normal stress difference ( N ) has a film thickening effect if positive in the direction of flow . Film thickness increases with yield stress .…”

Section: Resultsmentioning

confidence: 99%

Experimental study on film thickness and the problem of free surface film flow in dip coating

Chen

Zhang

Jian

et al. 2016

Asia-Pacific J Chem Eng

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Dip coating is widely applied in industries for coating a solid substrate with a fluid because of its simplicity and applicability to substrates with different shapes. An experimental study was reported with dip coater on the film coating of solid plates by withdrawal from a tank filled with silicone oil fluids or polyacrylic acid (PAA) solutions with different rheological properties, the liquid film thickness deposited on the plate substrate was measured using capacitance method, and the evolution of free surface morphology was recorded with photographs. The purpose was to investigate the effects of plate substrate roughness, withdrawal speed, rest time, and fluid viscosity on the liquid film thickness and free surface morphology in detail. Results showed that the increases in coating fluid viscosity, withdrawal speed, and substrate roughness are beneficial to film thickening. The influence of rest time on liquid film thickness could be neglected when it was greater than 3 min. For silicone oil fluids, the free surface exhibited a depression, which gradually deepened, with the increasing in withdrawal speed and viscosities. By contrast, PAA solutions showed a bump on the free surface, exhibiting a curvature that increased with the increasing in withdrawal speed and concentrations.

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A computational study of the influence of viscoelasticity on the interfacial dynamics of dip coating flow

Cited by 16 publications

References 46 publications

High-Performance Carbon Nanotube Transparent Conductive Films by Scalable Dip Coating

High-Performance Carbon Nanotube Transparent Conductive Films by Scalable Dip Coating

Sliding droplets of Xanthan solutions: A joint experimental and numerical study

Experimental study on film thickness and the problem of free surface film flow in dip coating

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