Содержание
- 2. LECTURE No. 4 PROPERTIES OF NANOSTRUCTURED MATERIALS
- 3. INTRODUCTION Physical-chemistry of solid-state nanostructures is a bridge between: Atomic Physics Physical chemistry of the concentrated
- 4. INTRODUCTION What is Nonotechnology? What is Nonoscience? Stability: Kinetic Thermodynamic factors
- 5. OBJECTIVES To analyse physico-chemical properties of nanostructured materials. To explain size effect of nanoparticles on the
- 6. OUTLINE Physico-chemical properties of nanostructured materials. Size effect of nanoparticles on the chemical and thermodynamic properties.
- 7. Factors, influencing the properties of nanostructured materials (with decreasing of size of nanoparticles): A change in
- 8. The formation of nanoparticles from atoms is accompanied by two processes: Formation of metallic nuclei of
- 9. Change in the free Gibbs energy (G) Physico-chemical properties
- 10. Electrical resistivity Physico-chemical properties Where: - ρ∞ is the electrical resistivity of a coarse grain substance,
- 11. Physico-chemical properties Mechanical properties Tensile strength and hardness: Where: - is strength of a single crystal,
- 12. Physico-chemical properties Effect of grain size (d) on the micro hardness of metals
- 13. Physico-chemical properties Effect of grain size (d) on the micro hardness of metals (a) and ceramics
- 14. Physico-chemical properties Two-dimensional model of nanocrystalline material. Nanocrystallites with different orientations Interphase boundaries (межзеренных границ) Internal
- 15. Physico-chemical properties The study of experimental data and reactions of atoms, clusters and nanoparticles of various
- 16. Types of size effects Internal: associated with specific changes in the volume and surface properties of
- 17. Types of size effects The study of internal dimensional effects is aimed on the studying of:
- 18. The melting point as a function of the particle size and its geometry. Thermodynamic representations Where:
- 19. The melting point as a function of the particle size and its geometry. Vibrations of atoms:
- 20. The melting point as a function of the particle size and its geometry. Vibrations of atoms:
- 21. The melting point as a function of the particle size and its geometry. Vibrations of atoms:
- 22. Control questions 1. What are the main factors that influence in the properties of nanomaterials?. 2.
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