Findings and conclusions. YAG is crystallized at 650AoC compared to the conventional preparation temperature of 1600AoC. Lower crystallization temperatures were achieved with an increase of agar content. The YAG crystallite size was estimated to be 11.4 nm when 30% by weight of agar was used. For the synthesis of spinel, ammonia hydrolysis results in amorphous solids. Spinel begins to crystallize as low as 420AoC compared to the solid state reaction temperature of 1600AoC. Because of the gelatin purification, only the spinel phase is present at higher temperatures. Crystallite sizes slightly decreased as the gelatin content increased. Crystallite sizes were estimated to be in the range of 1-5 nm. Nanocrystalline hydroxyapatite is formed within the gelatin matrix at room temperature estimating approximately 2.5 nm. Other important bioceramic calcium phosphate phases can be crystallized once the solid is heated. The sol-gello method is facile and applicable to the synthesis of different materials. Record low crystallization temperatures are achieved.Findings and conclusions.
|Title||:||A Sol-gello Approach to the Synthesis of Nanocrystalline Materials|
|Author||:||Amanda J. Nichols|
|Publisher||:||ProQuest - 2008|