Use of Microemulsions in the Formation and Characterization of Ultrafine Magnetic Oxide Particles (Expedited Award)

该项目涉及使用微乳液形成和表征超细磁性氧化物颗粒。微乳液是热力学上稳定的水和油的各向同性分散体，由表面活性剂稳定。这类系统由100-1000埃分散的液滴组成。这种微乳液中的反应可以用来生产超细的氧化铁颗粒。随着前驱体物种溶解在分散的液滴中，这些液滴的溶解和熔融以及随后的初级颗粒的凝聚导致了超细颗粒的形成。以前对微乳液中这种水滴的聚结和融合的研究表明，使用各种添加剂可以促进或抑制这种聚结。研究人员已经生产出了50-500埃的氯化银颗粒，这些颗粒与摄影技术有重要的关系。

This project involves the formation and characteriaztion of ultrafine magnetic oxide particles using microemulsions. Microemulsions are thermodynamically stable isotropic dispersions of water and oil stabilized by surfactants. Such systems consist of 100-1000 Angstrom dispersed droplets. The reactions in such microemulsions can be utilized to produce ultrafine particles of iron oxide. With the precursor species solubilized in the dispersed droplets, the sollisions and fusion of such droplets as well as the subsequent coagulation of primary particles result in the formation of ultrafine particles. Previous research on the coalenscence and fusion of such water droplets in microemulsions has revealed that such coalescence can be promoted or retarded by the use of various additives. The investigators have produced 50-500 Angstrom AgCl particles that have an important relationship to photographic technology.