Ceramics-Silikáty 48, (3) 93 - 99 (2004) |
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RHEOLOGY OF CERAMIC SUSPENSIONS WITH ORGANIC
OR BIOPOLYMERIC GELLING ADDITIVES - PART 1. THEORY OF LINEAR VISCOELASTICITY
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Gregorová Eva 1, Pabst Willi 1, Štětina Jiří 2
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1 Department of Glass and Ceramics, Institute of Chemical Technology Prague,
Technická 5, 166 28 Prague 6, Czech Republic
2 Department of Dairy and Fat Technology, Institute of Chemical Technology Prague,
Technická 5, 166 28 Prague 6, Czech Republic
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Keywords: Linear viscoelasticity, Storage modulus, Loss modulus, Phase angle, Complex viscosity
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Many new ceramic shaping methods, in particular those involving casting of ceramic suspensions into non-porous molds, are
based on gelation steps and sol-gel transitions. For these systems, usually containing an aqueous phase with organic or
biopolymeric ingredients, rotational viscometry is insufficient and oscillatory shear rheometry becomes an indispensible tool
to characterize the rheological changes during processing, particularly the body-formation step. In this introductory paper,
the theory of linear viscoelasticity is summarized for ceramic scientists and engineers to the degree necessary for a basic
understanding of the rheological behavior of sol-gel systems and gelation processes. This shortcut should provide a handy
reference for subsequent papers dealing with the rheology of ceramic suspensions containing carrageenan and other organic
or biopolymeric ingredients. |
 PDF (0.2 MB) |
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