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Key role of milling in the optimization of TiO2 nanoinks

Published online by Cambridge University Press:  01 June 2006

A. Sanson ,
D. Gardini ,
G. Montanari ,
C. Galassi  and
E. Roncari
A. Sanson*
Affiliation:
Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), I-48018 Faenza, Italy
D. Gardini
Affiliation:
Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), I-48018 Faenza, Italy
G. Montanari
Affiliation:
Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), I-48018 Faenza, Italy
C. Galassi
Affiliation:
Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), I-48018 Faenza, Italy
E. Roncari
Affiliation:
Institute of Science and Technology for Ceramics (ISTEC), National Research Council (CNR), I-48018 Faenza, Italy
*
a) Address all correspondence to this author. e-mail: sanson@istec.cnr.it
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Abstract

Nanostructured films of TiO2 are becoming more and more attractive as a consequence of their improved sensing properties. Screen printing represents an important low-cost alternative for the production of high-performance devices for the automotive industry. However, to obtain films with superior properties, the composition and each step of the ink production must be carefully controlled. Milling strongly influences the rheological properties of the ink and, as a consequence, the quality of the deposited film. The as-prepared ink was homogenized in a four steps-process with a three-roll mill, and the rheological properties at each intermediate stage were measured. The results showed the dramatic effect of the milling on the flow properties of the nanoink and suggested the importance of a careful control of this step. The rheological behavior of the inks was explained using the basic idea of the transient network theory (TNT) for physically cross-linked networks of polymer solutions. Only an optimized cycle of milling can assure the necessary reproducibility of the ink properties as well as their time stability.

Keywords

NanoscaleScreen printingSensor
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 6 , June 2006 , pp. 1561 - 1569
Copyright
Copyright © Materials Research Society 2006

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