Abstract
Abstract Viscoelastic properties of gellan gum aqueous solutions [San-Eigen F.F. I. (Osaka), Lot No. 62058A] were observed in order to study the influence of Ca 2+ -ions upon the solution properties. The results were (i) the solution of Sample 1 (Ca 2+ ~ 0.5%) showed narrowing of the oscillating amplitude of the ball after ~10 cycles (this is known as negative thixotropy); (ii) abrupt decreases in viscosity were observed for the solution of Sample 2 (Ca 2+ ~ 0.1%) in the narrow temperature range of ± 0.5 °C; (iii) unstable behavior of oscillating ball was found for the solution of Sample 3 (Ca 2+ ~ 0.00%), and this may be attributed to the inhomogeneity in the solution of the order of 10 −4 m, which was removed after stirring for one week.
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