Interfacial properties of nano TiO2 and cellulose paper coating

Yingzheng Liu, Bin Li, Youming Li, Helen Ocampo


This paper examined different kinds of organic functional groups that were introduced onto the surface of nano TiO2 by surface modification with different types of zircoaluminate coupling agents. The modified nanoTiO2 products with different interfacial properties were obtained, and the impact of the interfacial properties of nanoTiO2 on the rheological behavior of paper coating and the properties of coated paper was systematically investigated. The steady shear rheological results showed that the paper coatings containing nano TiO2 exhibited a pseudoplastic fluid behavior, characterized as obvious shear thinning. Compared to the hydrophilic unmodified nano TiO2, modified nano TiO2 could contribute more to the viscosity of paper coatings. The study on the dynamic viscoelasticity revealed that, through the enhancing action among each component in paper coatings, the modified nano TiO2 with quaternary amine groups or carboxyl led to a higher dynamic elastic storage modulus and viscous loss modulus of paper coatings. In addition, SEM and AFM analyses indicated that adding modified nano TiO2 products in paper coating could improve the coating structure, thus ameliorating the optical properties and printability of coated paper. The results obtained could provide a good reference for the application of nano pigments in paper coating.

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