Synthesis and Properties of Magnetic Ceramic Nanoparticles

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。非技术说明：磁性陶瓷纳米粒子将在本项目中进行研究，以探索其有趣的物理化学性质及其在催化和气体传感方面的应用前景。 增强的设备性能，预计这些系统在纳米级，由于它们的大活性与它们的大表面积。 特别是，纳米颗粒形式的溶解度明显大于本体溶解度;其原因尚不清楚。 在纳米级的相图将被构建，因为他们被认为是不同于那些散装。 这种方法可以为磁性系统的纳米技术提供真正的突破。 参与该项目的学生和博士后研究员将对迪克讷大学的基础设施产生重大影响。技术优势：该项目提出合成掺杂锡、钛、锌、铈、铬和锆的磁性纳米颗粒。 制备纳米颗粒体系的技术有水热合成法和机械化学活化法。 将使用穆斯堡尔谱、X射线衍射、电子显微镜、磁性测量和热分析进行结构和磁性表征。 该项目首次确定了纳米颗粒系统的溶解度极限，并首次使用基于穆斯堡尔效应的应用程序来推断有关溶解度的信息。 从这些技术中获得的结构和磁性信息将与传感特性的测量结果相关，以便为选择的应用开发定制的增强型化学传感器的特性。 该项目将培养本科生，他们将在科学前沿工作，并对目前对固体磁性的理解产生重大影响。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).NON-TECHNICAL DESCRIPTION: Magnetic ceramic nanoparticles will be studied in this project to explore their interesting physico-chemical properties and their prospective applications in catalysis and gas sensing. Enhanced device performance is expected for these systems at the nanoscale, due to their large activity associated with their large surface areas. In particular, the solubility in the form of nanoparticles is considerably greater than the bulk solubility; the reasons for that are not yet understood. Phase diagrams at the nanoscopic levels will be constructed, as they are believed to be different from those of the bulk. This approach could provide a veritable breakthrough in the nanotechnology of magnetic systems. The students and the post-doctoral fellow involved in this project will make a significant impact on the infrastructure at Duquesne University.TECHNICAL DETAILS: The project proposes the synthesis of magnetic nanoparticles doped with tin, titanium, zinc, cerium, chromium and zirconium. The techniques used to prepare the system of nanoparticles are hydrothermal synthesis and mechanochemical activation. The structural and magnetic characterization will be performed using Mössbauer spectroscopy, X-ray diffraction, electron microscopy, magnetic measurements and thermal analysis. This project determines for the first time the solubility limits of a system of nanoparticles and it uses for the first time an application based on the Mössbauer effect to infer information about miscibility. The structural and magnetic information derived from these techniques will be related to results of measurements of the sensing properties, in order to develop tailored characteristics of enhanced chemical sensors for select applications. This project will train undergraduate students who will work at the frontiers of science and have a significant impact on the current understanding of magnetism in solids.