Ultrafine Magnetic Particles of Metals, Metal Borides, and Metal Oxides

这个材料化学领域的多学科项目由无机、生物无机和有机金属化学项目和固体物理项目共同支持。合作研究者是堪萨斯州立大学的Christopher M. Sorensen博士和Kenneth J. Klabunde博士以及特拉华大学的George C. Hadjipanayis博士。研究将继续进行超细磁性颗粒的合成和评价，目的是与散装样品相比，更多地了解这些颗粒的基本特性，以开发方便的合成方法，保护和控制颗粒大小和微观结构。并更好地理解它们形成过程的化学和物理原理。广泛的合成方法，以制备金属，金属硼化物和金属氧化物颗粒的尺寸范围在1-1000纳米将进行研究。合成技术将包括金属原子在惰性气体和溅射下在冷基体中聚集。还将研究硼氢化物还原金属离子、氢氧化物沉淀和消解以及气溶胶的热解。反胶束技术将用于控制颗粒大小，并在结构介质中捕获小颗粒，如聚合物、沸石或维科尔玻璃，也将进行研究。磁性颗粒将在化学成分、形态、磁有序、磁矩、矫顽力和相变等方面进行全面表征。

This multidisciplinary project in the area of materials chemistry is jointly supported by the Inorganic, Bioinorganic and Organometallic Chemistry Program and the Solid State Physics Program. The collaborating investigators are Dr. Christopher M. Sorensen and Dr. Kenneth J. Klabunde of Kansas State University and Dr. George C. Hadjipanayis of the University of Delaware. Research will continue on the synthesis and evaluation of ultrafine magnetic particles, with the goals of learning more about the fundamental properties of these particles compared to bulk samples, to develop convenient methods for synthesis, protection and control of particle sizes and microstructure, and to gain a better understanding of the chemistry and physics of the processes by which they are formed. A broad range of synthetic approaches to the preparation of metallic, metal boride and metal oxide particles in the size range of 1-1000 nm will be investigated. Synthetic techniques will include metal atom clustering in cold matrices under inert gases and sputtering. Also to be investigated are reduction of metal ions by borohydride, hydroxide precipitation and digestion, and pyrolysis of aerosols. Reversed micelle techniques will be explored for the control of particle sizes, and the trapping of small particles in structural media, such as polymers, zeolites or vycor glass, will be investigated also. Magnetic particles will be thoroughly characterized with respect to chemical composition, morphology, magnetic ordering, magnetic moment, coercivity, and phase transformations.