CAREER: Determination of Glass Structure using Laser Induced Time of Flight Mass Spectroscopy

教员早期职业发展项目将使用激光诱导飞行时间质谱（LITOF-MS）来确定氧化硼基玻璃系统的中短程顺序。已知纯氧化硼玻璃的网状结构中含有三配位硼的六方环。然而，对于玻璃中存在的硼中有多少是与这些环结合在一起的，存在着分歧。飞行时间质谱的直接反褶积将产生有关该玻璃中存在较大结构单元的有价值的信息，以及环群丰度的定量数据。碱硼酸玻璃可以由各种更大的基团组成，包括由四配位硼连接的链和六边形环。这些较大的单位在不同成分的碱硼酸玻璃中的存在和相对丰度将用质谱仪测量。相同化学计量的晶体将被研究，并用作校准和分析的起点。在项目的这一阶段，将检查掺杂剂（以低于1mol / l的浓度引入玻璃中的发色团）对激光照射下网络分组产量的影响。在项目的最后阶段，LITOF-MS将用于碱硼硅酸盐玻璃的研究。人们普遍认为这些玻璃主要由硅酸盐和硼酸盐亚网络组成，但关于掺杂剂的影响以及两种网络之间是否存在相互作用的问题仍然存在。核磁共振数据在这些问题上产生了相互矛盾的证据，但LITOF-MS应该提供可以回答这些问题的数据。由于Coe学院主要是一个本科生机构，这项工作将与本科生一起进行，为他们提供难得的长期研究机会，并接触到材料科学领域的前沿工作。学生将进行样品制造和表征，以及飞行时间的测量。此外，外展计划将弥合学院和当地高中之间的差距。附近两所高中的高级物理和化学班将被带到校园进行年度访问和关于科学和工程职业的研讨会，并将有几次机会与本科生研究人员互动。这个CAREER项目将利用激光诱导飞行时间质谱（LITOF-MS）来研究短程和中程原子排列，试图回答关于氧化硼基玻璃的几个基本问题。这个项目将帮助我们了解这些技术上重要的材料的结构。本科生参与研究将为他们提供材料研究方面的经验。＊＊＊

9733724 Affatigato The Faculty Early Career Development project will use laser induced time-of-flight mass spectroscopy (LITOF-MS) to determine the short- and intermediate-range order of boron oxide-based glass systems. It is known that the network of pure boron oxide glass contains hexagonal rings of three-coordinated boron. Disagreement exists, however, regarding what fraction of the boron present in the glass is tied up in these rings. The straightforward deconvolution of time-of-flight mass spectra will yield valuable information regarding the presence of larger structural units in this glass, as well as quantitative data on the abundance of the ring groupings. Alkali borate glasses can be made up of a variety of larger groups, including chains and hexagonal rings linked by four-coordinated borons. The presence and relative abundance of these larger units in alkali borate glasses of varying compositions will be measured using the mass spectrometer. Crystals of the same stoichiometry will be investigated and used as starting points for calibration and analysis. During this stage of the project, the effect of dopants (chromophores introduced into the glass at concentrations below 1 molar percent) on the yield of network groupings upon laser irradiation will be examined. In the last stage of the project, the LITOF-MS will be used to study alkali borosilicate glasses. It is generally agreed that these glasses are made up mostly of silicate and borate sub-networks, but questions remain about the effect of dopants and if there is interaction between the two networks. NMR data yields contradictory evidence on these matters, but the LITOF-MS should provide data that can answer these questions. As Coe College is a primarily undergraduate institution, the work will be carried out with undergraduate students, providing them a rare long-term researc h exposure to cutting-edge work in materials science. The students will carry out the sample manufacture and characterization, as well as the time of flight measurements. In addition, outreach programs will bridge the gap between the College and the local high schools. The upper-level physics and chemistry classes of two nearby high schools will be brought on campus for yearly visits and seminars on careers in science and engineering, and will have several opportunities to interact with the undergraduate researchers. %%% This CAREER project will seek to answer several fundamental questions about boron oxide-based glasses using laser induced time-of-flight mass spectroscopy (LITOF-MS) to examine the short- and intermediate-range atomic arrangements. The project will help us understand the structure of these technologically important materials. The involvement of undergraduate students in the performance of the research will provide them with experience in materials research. ***