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

小行星9500812 纳米材料（粒径在1-100 nm范围内）是重要的陶瓷前体，催化剂，吸附剂，分子筛，涂料等这项工作旨在测试的假设，即结构是亚稳态的散装实际上是积极稳定的纳米材料。 Co-PI与Alcoa合作，使用γ氧化铝作为技术上重要的例子，建议通过高温溶液量热技术确定作为粒度（表面积）函数的γ-氧化铝转变的焓。PI提出通过高温溶液量热技术确定氧化铝中α-γ转变的焓作为粒度的函数。 研究结果对理解亚稳相纳米粒子的稳定性有一定的参考价值。

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.