Nanophases: Energetics Metastability, and Implications for Processing and Use (SGER Award)

纳米相：能量学亚稳定性以及对加工和使用的影响（SGER 奖）

• 批准号: 9500812
• 负责人: Alexandra Navrotsky
• 金额: $ 1.2万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9500812&HistoricalAwards=false
• 关键词: Nanophases; Energetics; Metastability; Implications; Processing

9500812 Navrotsky Nanophase materials (particle sizes in the 1-100 nm range) are important as ceramic precursors, catalysts, and adsorbents, molecular sieves, coatings, etc. This work seeks to test the hypothesis that structures which are metastable in the bulk are actually energetically stabilized as nanoscale materials. Using gamma alumina as a technologically important example, in collaboration with Alcoa, Co-PI proposed to determine the enthalpy of the alphagamma transition as a function of particle size (surface area) by high temperature solution calorimetric techniques. %%% PI proposed to determine the enthalpy of the alpha-gamma transition in alumina as a function of particle size by high temperature solution calorimetric techniques. The results will be useful in understanding the stability of nanosize particles of metastable phases.

9500812 Navrotsky 纳米相材料（粒径在 1-100 nm 范围内）作为陶瓷前体、催化剂、吸附剂、分子筛、涂料等非常重要。这项工作旨在检验这样的假设：本体中亚稳态的结构实际上作为纳米级材料在能量上是稳定的。 以 γ 氧化铝作为技术上重要的例子，Co-PI 与 Alcoa 合作，提出通过高温溶液量热技术确定 αγ 转变的焓与颗粒尺寸（表面积）的函数关系。 %%% PI 提议通过高温溶液量热技术确定氧化铝中 α-γ 转变的焓作为颗粒尺寸的函数。 该结果将有助于理解亚稳相纳米颗粒的稳定性。