2. Metallic and Ionic Nanoparticles Extendable Structures: Solids

3. © McREL 2009 2 Iron nanoparticles in YOUR backyard? Nanoparticles

4. Extendable Structures: Solids © McREL 2009 3 MetallicMetal AtomsMetallic bondsExtendable IonicCations and anions Ionic bondsExtendable Network covalent AtomsCovalent bondsExtendable MolecularMoleculesCovalent bonds and intermolecular forces Discrete Types of Solids

5. Extendable Structures: Solids © McREL 2009 4 Extendable Discrete, Molecular-type Discrete, Molecular-type can be or metallic, ionic, or network solids molecular solids Solid Structures

6. Extendable Structures: Solids © McREL 2009 5 Metallic Solids

7. Extendable Structures: Solids © McREL 2009 6 MetallicIonic Nanoparticles

8. Extendable Structures: Solids © McREL 2009 7 MetallicIonic Nanoparticles

9. Extendable Structures: Solids © McREL 2009 8 Metallic Solids

10. Extendable Structures: Solids © McREL 2009 9 High melting points Ionic Solids

11. Extendable Structures: Solids © McREL 2009 10 Metallic Macroparticles contain moles of atoms Metallic Nanoparticles contain 10-70,000 particles Metallic Solids

12. Extendable Structures: Solids © McREL 2009 11 Why is SIZE such a critical factor? Metallic Nanoparticles

13. Extendable Structures: Solids © McREL 2009 12 As the size of the nanoparticle decreases,  the ratio of surface atoms to interior atoms increases.  the percentage of surface atoms in the sample increases.  the average coordination number in the sample decreases. Metallic Nanoparticles

14. Extendable Structures: Solids © McREL 2009 13 Did the basic shape of the nanoparticles change? Metallic Nanoparticles

15. Extendable Structures: Solids © McREL 2009 14 Metallic Nanoparticles

16. Extendable Structures: Solids © McREL 2009 15 Large number of surface atoms compared to the number of interior atoms Metallic Nanoparticles

17. Extendable Structures: Solids © McREL 2009 16 Professor Christopher Chidsey, Department of Chemistry, Stanford University Nanoparticles

18. Extendable Structures: Solids © McREL 2009 17 1.What is the effect of particle size on the surface area to volume ratio? 2.What is the effect of particle size on coordination number? 3.How do you think surface area to volume ratio relate to surface energy? 4.What properties could be most effected by surface energy? Making Connections

19. Extendable Structures: Solids © McREL 2009 18 Lesson 1.2 What Makes Nanoscience so Different? What makes Nanoscience so different? Compare Newtonian and Quantum Chemistry Regimes as they relate to nanoscale science Lesson 1.3 What Makes Nanoscience so Important? Interdisciplinary science The development of new technologies and instrumentation applications whose risk and benefits have yet to be determined Lesson 3.1 Carbon Chemistry Lesson 1.1 What is Nanoscience? What is Nanoscience? Examine and Compare size: macro, micro, sub- micro (nano) SI prefixes Lesson 2.2 Extendable Solids: Reactivity, Catalysis, Adsorption Lesson 2.3 Extendable Structures: Melting Point, Color Conductivity Lesson 3.2 Fullerenes and Nanotubes Lesson 2.1 Extendable Solids As the size of the sample decreases the ratio of surface particles to interior particles increases in ionic and metallic solids Poster Assessment Students will further investigate the essential question that they have considered throughout the module: How and why do the chemical and physical properties of nanosamples differ from those of macrosamples? Module Flow Chart