CAREER: Medium-Range Order in Polymeric Phosphate Glasses: Effects of Atomic-Scale Structures on Macroscopic Properties

小行星9733350 这个教师早期职业发展项目将调查有关属性的最基本和最普遍的问题之一 无定形材料：即， 什么 是 无序材料的结构特征与用于产生非晶材料的各种物理过程之间的关系。 具体而言，该项目将检查 在聚合磷酸盐玻璃结构中， 通过组成的变化和通过熔融加工形成。 它将 将这些结构变化与小说 具有流变性、耐水性和抗结晶性的耐用聚合磷酸盐玻璃。研究目标将使用跨学科的方法来完成，该方法整合了材料科学，流变学，固态化学和物理学以及工艺工程等方面，以探索受控剪切流对短程和中程有序结构的影响。 宏观 玻璃 将研究结构 通过 各种光谱学、显微镜、高效液相色谱和量热技术;然后通过X射线衍射实验将其与微观起源联系起来。 这项工作将关联熔融加工条件（如剪切变形，温度和剪切速率）与玻璃的最终流变行为。 结果将进行比较，磷酸盐玻璃的结构模型。 这个项目 将演变成一个主要的教育， 这将有助于提高爱荷华州州立大学的研究能力，并将通过与磷酸盐玻璃研究领域的国际领导者合作来促进这一能力。 此外，学生在材料科学与工程（MSE）部门将提供 一个相关的，以实践为导向的教育，是有吸引力的， 行业 这一目标将通过以下方式实现：（a）为研究生和本科生提供研究经验;（B）向学生展示跨学科研究在利用创新的计算机教学模块解决基本问题方面的协同效应;（c）为研究生提供与工业界实习的机会 通过利用工业部门的人力和设备资源， 合作伙伴;（d）发展 简单 高中理科学生实用材料科学示范教材 及其他远程教育教学 艾滋病; (e)发展中 学生合作学习 组， 和 (f)将研究结果纳入主要研究者的课程。 理解 化学耐久性的依赖性 以及对磷酸盐玻璃的组成和熔融加工条件的结晶倾向的抵抗性将增强磷酸盐玻璃在诸如用于高膨胀金属应用的玻璃-金属密封、阻燃剂、生物材料、核废料的储存材料、光学器件、磷光/荧光材料、制冷剂和承载有机/无机复合材料。此外，爱荷华州材料科学与工程系的学生 大学将提供一个 相关， 和实践导向的教育，这是有吸引力的行业。 ***

9733350 Otaigbe This Faculty Early Career Development project will investigate one of the most fundamental and general questions regarding the properties of amorphous materials: namely, what is the relationship between the structural characteristics of disordered materials and the various physical processes used to produce the amorphous material. Specifically, the project will examine the changes in polymeric phosphate glass structure caused by variations in composition and evolved by melt processing. It will correlate these structural changes in novel durable polymeric phosphate glasses with the rheology, durability to water, and resistance to crystallization. The research objectives will be accomplished using an interdisciplinary approach that integrates aspects of materials science, rheology, solid-state chemistry and physics, and process engineering to explore the effects of controlled shear flow on both the short-range and the intermediate-range order structure of the glasses produced. The macroscopic glass structure will be studied by various spectroscopy, microscopy, high performance liquid chromatography, and calorimetry techniques; it will then be linked to its microscopic origin through X-ray diffraction experiments. This work will correlate melt-processing conditions (such as shear distortion, temperature, and shear rate) with the ultimate rheological behavior of the glass. The results will be compared to reported structural models for phosphate glasses. This project will evolve into a major education and research capability at Iowa State University that will be facilitated through collaborations with international leaders in phosphate glass research. In addition, students in the Materials Science and Engineering (MSE) Department will be provided with a relevant, and practice-oriented education that is attractive to industry. This objective will be accomplished by (a) providing research experiences for graduate and undergraduate students in MSE; (b) demonstrating to students the synergistic effect of interdisciplinary research in solving fundamental problems using innovative, computer-based instructional modules; (c) developing graduate student internship opportunities with industry by leveraging both the human and the equipment resources of the industrial collaborators; (d) developing simple practical materials science demonstration kits for high school science students and other distant education teaching aids; (e) developing cooperative student learning groups, and (f) incorporating research findings into the principal investigator's courses. %%% Understanding the dependencies of chemical durability and resistance to crystallization tendencies on both the composition and the melt-processing conditions of phosphate glasses will enhance the use of phosphate glasses in applications such as glass-to-metal seals for high expansion metal applications, flame retardants, biomaterials, storage materials for nuclear wastes, optics, phosphorescent/fluorescent materials, scintillators, and load-bearing organic/inorganic composites. In addition, students in the Materials Science and Engineering (MSE) Department at Iowa State University will be provided with a relevant, and practice-oriented education that is attractive to industry. ***