Metallic and Ionic Nanoparticles Extendable Structures: Solids.

Metallic and Ionic Nanoparticles

Extendable Structures: Solids

Extendable Structures: Solids© McREL 2009

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Iron nanoparticlesin

YOUR backyard?

Nanoparticles


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Metallic Metal Atoms Metallic bonds Extendable

Ionic Cations and anions

Ionic bonds Extendable

Network covalent

Atoms Covalent bonds Extendable

Molecular Molecules Covalent bonds and intermolecular forces

Discrete

Types of Solids


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Extendable Extendable Discrete, Molecular-type

Discrete, Molecular-type

can be

or

metallic, ionic, ornetworksolids

molecularsolids

Solid Structures


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Metallic Solids


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Metallic Ionic

Nanoparticles


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Metallic Ionic

Nanoparticles


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Metallic Solids


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High melting points

Ionic Solids


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Metallic Macroparticles contain moles of atoms

Metallic Nanoparticles contain 10-70,000 particles

Metallic Solids


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Why is SIZE such a

critical factor?

Metallic Nanoparticles


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As the size of the nanoparticle decreases,

the ratio of surface atoms to interior atoms

increases.

the percentage of surface atoms in the sampleincreases.

the average coordination number in the sampledecreases.



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Did the basic shape of the nanoparticles change?



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Large number of surface atoms compared to the

number of interior atoms



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Professor Christopher Chidsey, Department of Chemistry, Stanford University

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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


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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 3.1Carbon 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 2.3Extendable Structures: Melting Point, Color Conductivity

Lesson 3.2Fullerenes 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

Metallic and Ionic Nanoparticles Extendable Structures: Solids.

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