Energetics of Nanomaterials

Navrotsky, Alexandra ; Woodfield, Brian ; Boerio-Goates, Juliana ; Hellman, Frances

Brigham Young University

关键词: Specific Heat;    Calorimetry;    Nanoscale, Nanomaterials, Energetics, Thermodynamics, Thermochemistry, Enthalpy, Heat Capacity, Specific Heat.;    Oxides;    Free Energy;   

DOI  :  10.2172/888867
RP-ID  :  DOE/ ER/15235-8
RP-ID  :  FG03-01ER15235
RP-ID  :  888867

美国|英语

来源: UNT Digital Library

【 摘 要 】

This project, "Energetics of Nanomaterials," represents a three-year collaboration among Alexandra Navrotsky (UC Davis), Brian Woodfield and Juliana Boerio-Goates (BYU), and Frances Hellman (UC Berkeley). It's purpose has been to explore the differences between bulk materials, nanoparticles, and thin films in term of their thermodynamic properties, with an emphasis on heat capaacities and entropies, as well as enthalpies. the three groups have brought very different expertise and capabilities to the project. Navrotsky is a solid-state chemist and geochemist, with a unique Thermochemistry Facility emphasizing enthalpy of formation measurements by high temperature oxide melt and room temperatue acid solution calorimetry. Boerio-Goates and Woodfield are calorimetry. Hellman is a physicist with expertise in magnetism and heat capacity measurements using microscale "detector on a chip" calorimetric technology that she pioneered. The overarching question of our work is "How does the free energy play out in nanoparticles?", or "How do differences in free energy affect overall nanoparticle behavior?" Because the free energy represents the temperature-dependent balance between the enthalpy of a system and its entropy, there are two separate, but related, components to the experimental investigations: Solution calorimetric measurements provide the energetics and two types of heat capacity measurements the entropy. We use materials that are well characterized in other ways (structurally, magnetically, and chemically), and samples are shared across the collaboration.