Back
 NJGC  Vol.4 No.2 , April 2014
The Behavior of Zeta Potential of Silica Suspensions
Abstract: Zeta potential is one of the most relevant parameters controlling the rheological behavior of ceramic suspensions. In this work, it was observed that for pH values below the isoelectric point (IEP), the positive value of zeta potential of water suspensions of α-quartz and α-cristobalite, experiences a sudden steep increase with the increase in specific surface area of the powders. For pH values above the IEP, the zeta potential values of crystalline forms of silica (α-quartz and α-cristobalite), get gradually more negative with the increase in pH. Conversely in the case of vitreous silica, for pH values above 6, there occurs a steep change towards more negative values of zeta potential than those presented by quartz and cristobalite. These findings have not yet been accounted for in the DLVO theory but may provide subsidies for better understanding of how to stabilize and destabilize crystalline and vitreous silica water suspensions.
Cite this paper: Antonio Alves Júnior, J. and Baptista Baldo, J. (2014) The Behavior of Zeta Potential of Silica Suspensions. New Journal of Glass and Ceramics, 4, 29-37. doi: 10.4236/njgc.2014.42004.
References

[1]   Hunter, J. (1988) Zeta Potential in Colloid Science: Principles and Applications. Academic Press, UK, 187-203.

[2]   Hunter, J. (1993) Everything You Want to Know about Coagulation & Floculation and Zeta Meter. Academic Press, UK, 26-39.

[3]   Reed, J.S. (1988) Introduction to the Principles of Ceramic Processing. EBS, New York, 265-274.

[4]   Zhang, Y. and Binner, J. (2008) Effect of Dispersants on the Rheology of Aqueous Silicon Carbide Suspensions. Ceramics International, 34, 1381-1386. http://dx.doi.org/10.1016/j.ceramint.2007.03.030

[5]   Pugh, R.J. and Bergstrom, L. (1994) Surface and Colloidal Chemistry in Advanced Ceramics Processing. Journal of the American Ceramic Society, 22, 94-104.

[6]   Gauckler, L.J., Graule, T.H. and Baader, F. (1999) Ceramic Forming Using enzime Catalyzed Reactions. Materials Chemistry and Physics, 68, 78-102. http://dx.doi.org/10.1016/S0254-0584(99)00117-0

[7]   Bisesier, J.G.P., Mcdermott, A.M., Yin, Y., Sambrook, R.M. and Vaidhyamatham, B. (2006) In Situ Coagulation Moulding—A New Route for High Quality Net Shape Ceramics. Ceramics International, 32, 29-35.
http://dx.doi.org/10.1016/j.ceramint.2004.12.006

[8]   Frenkel, D. (2002) Colloidal Systems: Playing Tricks with Designers Atoms. Ceramics International, 296, 65.

[9]   Dove, P.M. and Rimstidt, J.D. (1994) Silica Water Interactions—In Silica Reviews in Mineralogy. Mineral Society of America, 29, 259-307.

[10]   Ning, S., Li, H., Chen, W., Liu, B. and Chen, S. (2005) Effects of Surface Oxide Species and Contents on SiC Slurry Viscosity—Rare Metals. Mineral Society of America, 24, 240-245.

[11]   Prezzi, M., Monteiro, P.J.M. and Sposito, G. (1997) Use of Double Layer Theory to Explain the Behavior of Reaction Products Gels. ACI Materials Journal, 11, 10-11.

[12]   Alexander, S., Chaikin, P.M., Grant, P., Morales, G.P., Pincus, P. and Hone, D. (1984) Charge Renormalization, Osmotic Pressure, and Bulk Modulus of Colloidal Crystals Theory. Journal of Chemical Physics, 80, 5776-5781.
http://dx.doi.org/10.1063/1.446600

 
 
Top