Effects of CnTAB Chain Length and Concentration on the Rheological Properties of Aqueous Suspensions of Alkylated Alumina Powders

Autor:	R. M. Bock, Fred F. Lange
Rok vydání:	2006
Předmět:	Aqueous solution Condensation reaction chemistry.chemical_compound Isoelectric point chemistry Pulmonary surfactant Chemical engineering Rheology Materials Chemistry Ceramics and Composites Organic chemistry Hydroxide Dodecanol Surface charge
Zdroj:	Journal of the American Ceramic Society. 89:817-822
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1551-2916.2005.00808.x
Popis:	Alumina particles have successfully been alkylated via a condensation reaction between surface hydroxide sites and different, long chain alcohol molecules, specifically decanol, dodecanol, and octadecanol. These hydrophobic particles have been successfully dispersed in water using different CnTAB surfactant molecules, where n=10, 12, 14, 16. The effect of the length of the surfactant molecule and its concentration was quantified with rheological experiments. Rheology and conductivity measurements were used to determine the minimum amount of the surfactant needed to disperse the alkylated powder. Slurries formulated with the alkylated powder and the proper amount of CnTAB exhibited Newtonian rheology for n≥10. ξ potential measurements showed that the surface charge on the particles was always positive confirming that the CnTAB molecules, with a positive head group, surrounded the alkylated particles. Such powder did not have an isoelectric point. In addition, the Newtonian behavior of the alkylated-alumina/CnTAB slurry systems were independent of pH.
Databáze:	OpenAIRE
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