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We study the dynamics of liquid–liquid menisci in a circular tube at small capillary numbers in partial, pseudo-partial and complete wetting conditions. There exists a thin wetting film in the last two situations. By pseudo-partial wetting, we refer to systems having non-monotonic disjoining pressures, as described by Brochard-Wyart et al. (1991) [3]. In this situation, the disjoining pressure allows...
The proposed study focuses on the numerical modeling of the gas-jet wiping process, which is used to control the coating thickness applied on a solid substrate in various industrial processes. In the galvanization of steel strips, a turbulent slot jet is used to wipe the coating film dragged by a moving steel substrate after dipping in a liquid zinc bath. In the present study a numerical modeling...
Polymer based solar cells (PSC) can be manufactured in a continuous roll to roll process as a low cost regenerative energy source. Coating ink properties and film thicknesses of 30–200nm are challenging with respect to the manufacturing process, which itself has an important impact on film properties and cell efficiencies. In this paper we compare the large area coating methods: knife coating, slot-die...
The effect of chain end groups on the drying of phase separating polymer blends was investigated for different functionally terminated poly(dimethyl siloxane) (PDMS). The drying rates of a PDMS/cellulose acetate butyrate (CAB) blend in methyl ethyl ketone (MEK) or isopropyl acetate (IA) were measured using the gravimetric method. The weight loss curves revealed that the addition of dihydroxyl-terminated...
Blends of water-soluble polymers and proteins serve as a matrix for the immobilization of active components in coatings. Water absorption of these blends is important for the properties and the performance of the films. We propose an additive model for the calculation of water absorption into polymer blends that is able to describe the measured values for different concentrations and for different...
We investigate the drying kinetics of a sessile droplet containing nanoparticles. Using a fast two-color confocal imaging technique, we probe the concentration field of nanoparticles along with the velocity and mobility fields of microparticles that act as flow tracers. The flow patterns evolve according to a complex kinetics which is related to recirculating Marangoni flow coupled to the time-evolving...
We study the pattern formation induced by drying colloidal suspensions and polymer solutions in a vertical Hele-Shaw cell immersed in a reservoir. The contact line speed is controlled by pumping out the solution from the reservoir. At low capillary number stick–slip motion of the receding contact line can be observed for silica suspensions. Periodic strips spontaneously form during drying. We study...
The creation of practical paper-based electronics requires secured conductivity with conductive silver tracks fabricated on a paper substrate. Various paper properties were explored for obtaining the key parameters intimately related to printed circuit qualities. A comparison of the resistance of silver tracks printed by ink-jet with a tetradecane-based ink of silver nanoparticles among four substrates—photo-quality...
Slot-die coating is actually the most used coating method for the manufacturing of lithium-ion battery electrodes. An easy way of reducing production costs is to increase the line capacity. Thus, the relatively high-viscous slurries are coated at continuously increasing velocities. Facing these higher and higher velocities, the main processing challenge is to ensure that the surface quality stays...
Printability of functional inks on multilayer curtain coated substrates was investigated. The inks represent those commonly used to produce solution processable electronic devices, such as organic transistors. The substrate, which combines sufficient barrier and printability properties for printed functional devices, was manufactured utilizing high speed curtain coating technique. The coating structure...
Vitreous enamel coatings have been used for many centuries to protect metallic substrates from corrosion phenomena and improve the aesthetics of the coated objects. They are manufactured by smelting frits, thus forming an inorganic, adherent and protective layer on the metal.The durability of aesthetic properties is related to the resistance of the surface to mechanical damage. One kind of possible...
We investigate the coating of a glass plate with silica colloids by a dip coating method in presence of evaporation. We show experimentally that the deposed quantity plotted versus plate velocity V exhibits a minimum, in agreement with a simple argument developed by us in a previous, theoretical paper. This minimum corresponds to a crossover between the well-known Landau–Levich regime observed at...
The evolution of an advancing fluid front formed by a gravity-driven thin film flowing down a planar substrate is considered, with particular reference to the presence of Marangoni stresses and/or surface topography. The system is modelled using lubrication theory and solved via an efficient, adaptive multigrid method that incorporates automatic, error-controlled grid refinement/derefinement and time...
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