Viscoelastic behavior of ceramic suspensions with carrageenan

Rheological Studies of Silica-Tragacanth Suspensions

“…[20] At higher temperatures a change in the structure of tragacanth, and therefore a change in elasticity of the network can occur. With the increases of the temperature the intramolecular arrangement can change from helix to coil structure, which is similar to what has been described for other polysaccharides, for example, carrageenan [27] and xanthan gum. [28] …”

Rheological behavior of thermoreversible κ-carrageenan/nanosilica gels

“…However, despite the numerous studies devoted to biopolymer/SiO 2 nanocomposites, little is known about the interaction between the biopolymer backbone and such SiO 2 fillers and their influence on the final properties of the nanocomposites. Two recent studies of biopolymer composites have reported opposite effects arising from the addition of nanosized inorganic fillers to the biopolymer matrix [8,14]. One study reports that addition of nanosized ZrO 2 to κ-carrageenan gels enhances viscoelastic properties with an increase of the elastic modulus by at least 2 orders of magnitude [14] and, in a second study, the addition of silicate to gelatin produces a weakening effect of the gel structure due to the formation of a precipitate that reduces gelatin concentration and, hence, decreases the strength of the gel formed [8].…”

Optimization of Fine Alumina Gelcasting UsingIn SituDynamic Rheology

“…The storage modulus decreased from 1.2 MPa at its maximum, to 0.7 MPa at 50 vol% of ceramic particles. This value is still about two orders of magnitude higher than the values of the storage modulus, which is usually required for the demolding and handling of ceramic gels …”