engleski

Synergistic Effect of Different Dispersants on Rheological Properties of Highly Concentrated Alumina Suspensions

This study aims to develop highly concentrated alumina suspensions, stabilized with three different dispersants Darvan C-N, 4, 5-dihydroxy- 1, 3-benzenedisulfonic acid disodium salt monohydrate (Tiron) and citric acid monohydrate. Alumina suspensions were prepared with 70 wt, % of high purity alumina (Al2O3) powder, with the average particle size 300-400 nm. To achieve this objective, the formulations were prepared by using the simplex lattice mixture design to evaluate the effect of different amounts of dispersants on rheological properties of highly concentrated alumina suspensions and their synergistic effect. Based on simplex lattice design, a cubic model was established as a function of the compositions of prepared Alumina suspensions. The optimal proportions were obtained by considering the cross-sectional area. The statistical analysis includes the use of variance (ANOVA) to determine the most significant factors and the response surface plots to interpret the relationship between the use of different dispersants to develop a highly concentrated alumina suspension. The ANOVA results indicated a high coefficient of determination value, while the 3D plots for single-response optimization present the desirability region and the optimal values of the input parameters. The use of a simplex lattice design allows us to study the influence of different dispersants and factors of formulation of the manufacturing process of concentrated alumina suspensions.

Alumina suspensions, Darvan C-N, 4, 5-dihydroxy-1, 3-benzenedisulfonic acid disodium salt monohydrate (Tiron), citric acid monohydrate, simplex lattice design

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