In-situ TEM Heating Studies of Nanoscale and Submicron Sized Ceramic Oxide Powders (Engineering)

对单块水泥土原位加热行为的初步研究 100-300 nm MgO烟雾颗粒的晶体立方体表明， 两块烧结单晶体间颈缩稳定性 与颗粒的接触几何形状直接相关。 这 研究项目是最初MgO立方体的逻辑扩展 study. 它将侧重于以下目标： 负责物质运输的具体机制 真空加热，亚微米尺寸的MgO单晶立方体;原位 TEM加热研究聚结和物质输运 孤立的纳米级、单晶、球形颗粒对， 陶瓷氧化物;较大陶瓷阵列的原位加热研究 纳米颗粒;和异位加热研究，以检查 烧结气氛对颈部形态和 稳定 初步观察到的颈部不稳定性 研究从来没有被观察或预测过。 这 研究将发展我们对这种现象的理解， 进一步的原位实验可能会导致更多的新的 深入了解细颗粒的烧结。 东道机构的互动活动包括： 教授两门新课程（一门课程将研究非晶体 固体通过检查散装和薄膜玻璃，和其他 课程将是一个工程/技术调查课程， 工程师，基于材料科学主题）;和参与， 一位在科学和工程领域的女性讨论领袖， 女大学生组织。 本项目进一步促进了VPW计划的目标，即（1） 为妇女提供机会， 工程和科学的学科由NSF支持， (2)鼓励女性从事科学和工程职业 通过提高女性科学家和工程师的知名度， 受雇于工业、政府和学术机构。 通过 鼓励妇女参与科学，这是一个宝贵的 投资于国家未来的科学活力。

A preliminary study of the insitu heating behavior of single- crystal cubes of 100-300 nm MgO smoke particles has shown that the stability of neck formed between 2 sintering single-crystal cubes is directly related to the contact geometry of the particles. This research project is a logical extension of the initial MgO cube study. It will focus on the following objectives: determination of the specific mechanism(s) responsible for mass transport in vacuum heated, sub-micron-sized MgO single crystal cubes; insitu TEM heating studies of coalescence and material transport in isolated pairs of nanoscale, single crystal, spherical particles of ceramic oxides; insitu heating studies of larger arrays of nanoscale particles; and exsitu heating studies to examine the effects of the sintering atmosphere on neck morphology and stability. The neck instabilities observed in the preliminary studies have never before been observed or predicted. This research will develop our understanding of this phenomena, and further insitu experiments are likely to lead to additional new insights into the sintering of fine particles. Interactive activities at the host institution include: organizing and teaching two new courses (one course will study noncrystalline solids by examining both bulk and thin-film glasses, and the other course will be an engineering/technology survey course for non- engineers, based on materials science topics); and participation as a discussion leader in Women in Science and Engineering, an organization for women undergraduates. This project furthers VPW program objectives which are (1) to provide opportunities for women to advance their careers in engineering and in the disciplines of science supported by NSF and (2) to encourage women to pursue careers in science and engineering by providing greater visibility for women scientists and engineers employed in industry, government, and academic institutions. By encouraging the participation of women in science, it is a valuable investment in the Nation's future scientific vitality.