Thixotropic Properties of Latvian Illite Containing Clays


  • Vitālijs Lakevičs Riga Technical University
  • Valentīna Stepanova Riga Technical University
  • Santa Niedra Riga Technical University
  • Inga Dušenkova Riga Technical University
  • Augusts Ruplis Riga Technical University



thixotropy, viscosity, clay, suspension, solid phase


Thixotropic properties of Latvian Devonian and Quaternary clays were studied. Dynamic viscosity of the water clay suspensions were measured with a rotating viscometer. Influence of concentration, pH and modifiers on the thixotropic clay properties was analyzed. It was found that Latvian clays have thixotropic properties. Stability of clay suspensions is described with the thixotropy hysteresis loop. Increasing the speed of the viscometer rotation, dynamic viscosity of the clay suspension decreases. It was found that the solid phase concentration and mineralogical composition make an impact on the thixotropy of clays. Decreasing the solid phase concentration in the clay suspensions from 50% to 25%, dynamic viscosity decreases proportionally to the solid phase concentration. It was found that modifying clay suspensions with carboxymethyl cellulose (0,1g) increases concentration of structure forming. In the same time, modifying of clay suspensions with calcified soda (0,1g) decreases the structure forming concentration. Dependence of pH value from the solid phase concentration slightly decreases with the clay phase concentration increasing in the suspension.


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C.H.Lee, V.Moturi, Y.Lee. Thixotropic property in pharmaceutical formulations. J. Controlled Release, 2009, 136, pp. 88–98.

J.Mewis, N.J.Wagner. Thixotropy. Adv. Colloid Interface Sci., 2009, (147–148), 214-227.

Y.Li, W.Hou, W.Zhu. Thixotropic properties of aqueous suspensions containing cationic starch and aluminum magnesium hydrotalcite-like compound. J. Colloid Interface Sci., 1, 2007, 313, pp.305-314.

C.Zhu, J.E.Smay. Thixotropic rheology of concentrated alumina colloidal gels for solid freeform fabrication. J. Rheol., 2011, 55, pp.655-673.

B.Derakhshandeh, D.Vlassopoulos, S.Hatzikiriakos. Thixotropy, yielding and ultrasonic doppler velocimetry in pulp fibre suspensions. Rheol. Acta, 2011, pp. 1-14.

A.Malkin, S.Ilyin, A.Semakov, V.Kulichikhin. Viscoplasticity and stratified flow of colloid suspensions. Soft Matter, 2012, 8, 2607-2617.

M.I.Carretero, M.Pozo. Clay and non-clay minerals in the pharmaceutical and cosmetic industries Part II. Active ingredients. Appl. Clay Sci., 3, 2010, 47(3-4), pp.171-181.

C.Viseras, C.Aguzzi, P.Cerezo, A.Lopez-Galindo. Uses of clay minerals in semisolid health care and therapeutic products. Appl. Clay Sci., 2007, 36(1-3), pp. 37-50.

A.Ruplis. Sorption and catalytic properties of Latvian clay powders. Progress in Colloid and Polymer Science; SpringerVerlag 2000, 116, pp. 48-56.




How to Cite

V. Lakevičs, V. Stepanova, S. Niedra, I. Dušenkova, and A. Ruplis, “Thixotropic Properties of Latvian Illite Containing Clays”, ETR, vol. 1, pp. 133–137, Aug. 2015, doi: 10.17770/etr2013vol1.813.