Dispersion stability of a ceramic glaze achieved through ionic surfactant adsorption

Journal of Colloid and Interface Science
Preecha PanyaErica J Wanless

Abstract

The adsorption of cetylpyridinium chloride (CPC) and sodium dodecylbenzenesulfonate (SDBS) onto a ceramic glaze mixture composed of limestone, feldspar, quartz, and kaolin has been investigated. Both adsorption isotherms and the average particle zeta potential have been studied in order to understand the suspension stability as a function of pH, ionic strength, and surfactant concentration. The adsorption of small amounts of cationic CPC onto the primarily negatively charged surfaces of the particles at pH 7 and 9 results in strong attraction and flocculation due to hydrophobic interactions. At higher surfactant concentrations a zeta potential of more than +60 mV results from the bilayered adsorbed surfactant, providing stability at salt concentrations < or = 0.01 M. At 0.1 M salt poor stability results despite substantial zeta potential values. Three mechanisms for SDBS adsorption have been identified. When anionic SDBS monomers either adsorb by electrostatic interactions with the few positive surface sites at high pH or adsorb onto like charged negative surface sites due to dispersion or hydrophobic interactions, the magnitude of the negative zeta potential increases slightly. At pH 9 this increase is enough to promote stabil...Continue Reading

References

Nov 20, 1998·Journal of Colloid and Interface Science·K EsumiY Koide
May 1, 1999·Journal of Colloid and Interface Science·J WangR K Thomas
May 26, 1999·Journal of Colloid and Interface Science·Z BiJ Yu
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May 14, 2003·Journal of Colloid and Interface Science·L H TornJ Lyklema
Jun 5, 2003·Advances in Colloid and Interface Science·R AtkinS Biggs

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Citations

Jun 23, 2009·Journal of Colloid and Interface Science·Simona OvtarMiha Drofenik
Mar 20, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Philip MarquetRob Atkin

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