Time-Resolved Spectroscopy of Bulk and Thin Film Structure and Dynamics

体膜和薄膜结构与动力学的时间分辨光谱

• 批准号: 9317198
• 负责人: Keith Nelson
• 金额: $ 37.5万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-01 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317198&HistoricalAwards=false
• 关键词: Time; Resolved; Spectroscopy; Bulk; Thin

9317198 Nelson Femtosecond through millisecond time-resolved spectroscopy of condensed matter will be conducted to understand the dynamics of structural change in solids and liquids. Structural phase transitions between crystalline phases and structural evolution in glass-forming liquids and polymers will be examined. The results will be analyzed in terms of theoretical models of structural change, which describe the behavior of whole classes of materials and which therefore transcend individual materials, and in terms of molecular models which attempt to explain the behavior of specihc materials by taking their distinguishing characteristics into account. Measurements of the mechanical and thermal conductivity properties of thin films will also be performed. The goals will be to understand the relations between the linear mechanical response of the interface, the nonlinear response (e.g. peeling) measured by destructive tests, and the interface chemistry and bonding. The work on thin film polymers will have an immediate practical impact. The proposed method permits noncontact, nondestructive, rapid in situ determination of mechanical and thermal properties (elastic and loss moduli, thermal diffusivities) of supported or unsupported polymer films used in microelectronics, protective coatings, and other applications. If noncontact adhesion quality assessment proves possible, this will present a truly revolutionary tool to the applied community. ***

9317198尼尔森飞秒通过毫秒的时间分辨的凝结物质将进行凝结物质，以了解固体和液体结构变化的动力学。 将检查结晶相和玻璃形成液体中的结构演化之间的结构相变。 将根据结构变化的理论模型来分析结果，这些模型描述了整个材料的行为并因此超越了单个材料的行为，以及试图通过采取区分特征来解释SpecIHC材料的行为的分子模型。考虑到。还将进行薄膜的机械和热导率特性的测量。目标是了解界面的线性机械响应，通过破坏性测试测量的非线性响应（例如剥离）与界面化学和键合之间的关系。薄膜聚合物的工作将立即产生实际影响。所提出的方法允许对微电机，保护性涂层和其他应用中使用的或无支撑的聚合物膜的机械和热性能（弹性和损耗模量，热扩散率）的非连接，无效（弹性和损耗模量，热扩散率）。 如果非连接粘附质量评估证明是可能的，这将为应用社区提供真正革命性的工具。 ***