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The Viscosity Properties of Sodium Silicate Solutions

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Abstract

Using a NDJ-1 rotational viscometer and an AR500 rheometer, both static and dynamic viscosities of sodium silicate solutions were measured with changes of concentration, temperature, modulus (molar ratio of SiO2 to Na2O), shear rate and chemical additives. Static results show that viscosity increases monotonously with concentration varying from 15 to 55%, decreases with temperature rising from 15 to 70 °C, and has a minimum value at a modulus of about 1.8. Measured data can be fitted quantitatively either by the Krieger-Dougherty expression or the Arrhenius equation with good agreement. This fact suggests that the sodium silicate solutions exhibit the properties of a suspension, in which the silicate anions, mainly constructed of Q 1 and Q 2 groups, act as a binder; the colloidal particles mainly constructed of Q 3 and Q 4 groups and small cations, act as effective rigid particles. Dynamic results show a shear thickening property in the high shear-rate regime, and a Newtonian property in the low shear-rate regime.

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  1. Department of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Hankou, Wuhan, 430023, China

    Xiaohong Yang, Weiling Zhu & Qiao Yang

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  1. Xiaohong Yang
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  2. Weiling Zhu
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  3. Qiao Yang
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Correspondence to Xiaohong Yang.

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Yang, X., Zhu, W. & Yang, Q. The Viscosity Properties of Sodium Silicate Solutions. J Solution Chem 37, 73–83 (2008). https://doi.org/10.1007/s10953-007-9214-6

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