Dynamic Water Transport in a Pigmented Porous Coating Medium / Carl-Mikael Tag in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4181–4189 Titre : Dynamic Water Transport in a Pigmented Porous Coating Medium : Novel Study of Droplet Absorption and Evaporation by Near-Infrared Spectroscopy Type de document : texte imprimé Auteurs : Carl-Mikael Tag, Auteur ; Mikko Juuti, Auteur ; Kimmo Koivunen, Auteur Année de publication : 2010 Article en page(s) : pp. 4181–4189 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dynamic Porous Coating Résumé : The dynamic wetting of, and absorption into, model porous coatings in the form of compressed particulate pigment tablets by monocomponent, dual-component, and multicomponent liquid droplets has been studied by observation of apparent contact angle and near-infrared spectroscopy to identify the liquid water/moisture content. The absorption of the liquids was studied in a corresponding vapor-saturated environment. Liquid evaporation was determined for the tablets at both equilibrium starting pore saturation and under limited volume-filling conditions as evaporation proceeds. The changes in water and moisture content within the coatings as a function of time were also determined gravimetrically to relate the water uptake and evaporation being observed to changes in the near-infrared spectral data. Model and commercial offset printing fountain solutions were compared with respect to both absorption and evaporation. For the solutions containing isopropyl alcohol in water, a nonlinear behavior in the water response in the near-infrared spectra during absorption is observed as a function of time, which can be related to the fast evaporation of the alcohol. The nonlinear region was followed by a decline in water and moisture content as the penetration/evaporation of the water phase proceeded. Comparing the near-infrared water volume dependency in the upper layers of the structure with weight loss during evaporation showed that the mechanism of liquid transport to the surface−air interface reflected the logarithmic volume distribution of pore sizes, as might be expected from capillarity considerations and pore condensation hysteresis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000289 [article] Dynamic Water Transport in a Pigmented Porous Coating Medium : Novel Study of Droplet Absorption and Evaporation by Near-Infrared Spectroscopy [texte imprimé] / Carl-Mikael Tag, Auteur ; Mikko Juuti, Auteur ; Kimmo Koivunen, Auteur . - 2010 . - pp. 4181–4189. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4181–4189 Mots-clés : Dynamic Porous Coating Résumé : The dynamic wetting of, and absorption into, model porous coatings in the form of compressed particulate pigment tablets by monocomponent, dual-component, and multicomponent liquid droplets has been studied by observation of apparent contact angle and near-infrared spectroscopy to identify the liquid water/moisture content. The absorption of the liquids was studied in a corresponding vapor-saturated environment. Liquid evaporation was determined for the tablets at both equilibrium starting pore saturation and under limited volume-filling conditions as evaporation proceeds. The changes in water and moisture content within the coatings as a function of time were also determined gravimetrically to relate the water uptake and evaporation being observed to changes in the near-infrared spectral data. Model and commercial offset printing fountain solutions were compared with respect to both absorption and evaporation. For the solutions containing isopropyl alcohol in water, a nonlinear behavior in the water response in the near-infrared spectra during absorption is observed as a function of time, which can be related to the fast evaporation of the alcohol. The nonlinear region was followed by a decline in water and moisture content as the penetration/evaporation of the water phase proceeded. Comparing the near-infrared water volume dependency in the upper layers of the structure with weight loss during evaporation showed that the mechanism of liquid transport to the surface−air interface reflected the logarithmic volume distribution of pore sizes, as might be expected from capillarity considerations and pore condensation hysteresis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1000289

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