Improvement of wetting properties of colloid silica binders / Maria Morga in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp 8532–8537 Titre : Improvement of wetting properties of colloid silica binders Type de document : texte imprimé Auteurs : Maria Morga, Auteur ; Grazyna Para, Auteur ; Zbigniew Adamczyk, Auteur Année de publication : 2010 Article en page(s) : pp 8532–8537 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Colloid silica Wetting properties Résumé : Wetting properties of colloid silica binders modified by addition of surfactants were investigated. Perfluorononanoic, an anionic surfactant, the nonionic fluorinated surfactant Zonyl FSO-100, the nonionic commercial surfactant Rokafenol, and their mixtures were studied. As a model silica binder, a 30% colloid dispersion of SiO2 in water was used, which was compared with the commercial binder Sizol, also based on colloid silica. The size of particles in these dispersions was determined by dynamic light scattering and by the atomic force microscopy imaging of particles deposited on mica. The zeta potential of particles was measured by microelectrophoresis. The dynamic surface tension and contact angles of binders on a paraffin substrate was determined by drop shape analysis. Our investigations showed that the Zonyl-FSO surfactant and its mixture with Rokafenol effectively reduced the dynamic contact angle to a value of 18°. Such low contact angles represent a significant improvement in comparison with commercial binders. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100772c [article] Improvement of wetting properties of colloid silica binders [texte imprimé] / Maria Morga, Auteur ; Grazyna Para, Auteur ; Zbigniew Adamczyk, Auteur . - 2010 . - pp 8532–8537. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp 8532–8537 Mots-clés : Colloid silica Wetting properties Résumé : Wetting properties of colloid silica binders modified by addition of surfactants were investigated. Perfluorononanoic, an anionic surfactant, the nonionic fluorinated surfactant Zonyl FSO-100, the nonionic commercial surfactant Rokafenol, and their mixtures were studied. As a model silica binder, a 30% colloid dispersion of SiO2 in water was used, which was compared with the commercial binder Sizol, also based on colloid silica. The size of particles in these dispersions was determined by dynamic light scattering and by the atomic force microscopy imaging of particles deposited on mica. The zeta potential of particles was measured by microelectrophoresis. The dynamic surface tension and contact angles of binders on a paraffin substrate was determined by drop shape analysis. Our investigations showed that the Zonyl-FSO surfactant and its mixture with Rokafenol effectively reduced the dynamic contact angle to a value of 18°. Such low contact angles represent a significant improvement in comparison with commercial binders. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100772c

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