Vitrification, Viscous Liquids and the Glass Transition in the Very High Positive Pressure Regimes

极高正压状态下的玻璃化、粘性液体和玻璃化转变

• 批准号: 9012249
• 负责人: C. Austen Angell
• 金额: $ 28.25万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012249&HistoricalAwards=false
• 关键词: Vitrification; Viscous; Liquids; Glass; Transition

Professors C. Austin Angell, George H. Wolf, Stuart M. Lindsay, and Dr. William F. Oliver are supported by a grant from the Theoretical and Computational Chemistry Program to study vitrification, viscous liquids, and the glass transition in the very high pressure regime. This research will elucidate the behavior of a variety of important chemical systems and materials when subjected to conditions of extreme pressure. The main thrust of this research concerns the extension of the study of liquid states and glass transition phenomenology to the very high pressure regime of 10 GPa where the product of the pressure and volume are comparable to the intermolecular potential. A combination of experimental techniques will be used to characterize such systems including the use of ultra-high contrast Brillouin scattering in conjunction with the use of a diamond anvil cell to maintain samples at ultra high pressures. A subsidiary thrust of the proposal is to explore the use of pressure-induced vitrification by destabilization of crystal lattices. Angell and co-workers conjecture that the pressure-induced vitrification phenomenon is a spinodal collapse similar in principle to that which terminates the liquid state at extreme negative pressures.

教授C。奥斯汀·安吉尔，乔治·H。作者：Wolf，Stuart M.林赛， 威廉·F博士奥利弗得到了 理论和计算化学课程学习 玻璃化，粘性液体，和玻璃化转变， 非常高的压力制度。 这项研究将阐明 各种重要化学体系的行为， 材料在承受极压条件时。 这项研究的主要重点是扩大 研究液态和玻璃化转变现象， 10 GPa的非常高的压力范围，其中 压力和体积与分子间 潜力 将结合实验技术， 用于表征这种系统，包括使用 超高对比度布里渊散射 使用金刚石压砧单元将样品保持在超 高压 该建议的一个附带要点是 探索使用压力诱导玻璃化， 晶格的不稳定。 Angell和同事 推测压力诱导的玻璃化现象 是一种失稳坍缩，其原理类似于 在极端负压下终止液态。