|About this Abstract
||Materials Science & Technology 2011
||Solution-Based Processing for Ceramic Materials
||Study of Reverse Micelle Nanoreactors for the Controlled Preparation of Zirconium Hydroxide Precipitates
||Hoorshad Fathi, James P. Kelly, Raghunath Kanakala, Daniel W. Davies, Olivia A. Graeve
|On-Site Speaker (Planned)
The thermodynamic stability of reverse micelle solutions for the preparation of zirconium hydroxide precipitates, containing various salt concentrations in the iso-octane/AOT/water/salt system was investigated using dynamic light scattering. Using the individual concentration limits of zirconium oxychloride and ammonium hydroxide in the micelle cores, stability plots for the precipitation of zirconium hydroxide was generated and experimentally tested. The precipitates were not maintained in the micelle core for all of the compositions within the defined region of the stability plot. This is attributed to negative surface charge development as a result of pH higher than the iso-electric point of zirconium hydroxide (~6-7) due to excess ammonium hydroxide. To overcome the charge development, a small portion of the anionic surfactant was replaced with cationic surfactant. This had both positive and negative effects. The consequences for the stability plot boundary between the stable and unstable regions were determined.