Abstract
We have studied the combined imbibition and evaporation of surfactant solutions into thin porous media by means of experiments and numerical simulations. Solutions of anionic and non-ionic surfactants were deposited onto moving sheets of paper by a droplet-on-demand inkjet system. Optical transmission imaging and infrared thermography were used to monitor their lateral transport and evaporation. Moreover, we propose a theoretical model based on a dual-porosity approach that accounts for moisture and surfactant transport in both the pores and the fibers of the paper sheets as well as for surfactant adsorption. The numerical simulations reproduce the experimental data qualitatively well.
Highlights
Surfactants are added to inkjet inks for a number of reasons [1]
We propose a theoretical model based on a dual-porosity approach that accounts for moisture and surfactant transport in both the pores and the fibers of the paper sheets as well as for surfactant adsorption
We have conducted systematic experiments regarding the effect of surfactants on the inkjet deposition of long lines in paper substrates
Summary
Surfactants are added to inkjet inks for a number of reasons [1]. Karkare et al found considerable differences in the water displacement efficiencies of a large number of long-chain ionic and non-ionic surfactant species [23]. They showed that there is a strong correlation between water displacement and the equilibrium spreading pressure for a subset of surfactants, but not all species adhered to it. Karkare and Fort showed that the water displacement showed a Colloids and Surfaces A: Physicochemical and Engineering Aspects 634 (2022) 127832 strong correlation with the capillary pressure differences induced by the inhomogeneous surfactant distribution [24]. The variation of the prefactor k with surfactant concentra tion indicated the importance of surfactant depletion near the wetting front due to adsorption on the fiber walls
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