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SUMMARY - Descriptions

SUMMARY - Descriptions. METALLIC Strong malleable solids Don’t dissolve eg copper. IONS ONLY. IONIC Crystals Dissolve in water eg sodium chloride (salt). IONS + FREE ELECTRONS. SIMPLE MOLECULAR Usually Gases eg CO 2 , H 2 O. ATOMS joined into GIANT MOLECULES. GIANT MOLECULAR

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SUMMARY - Descriptions

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  1. SUMMARY - Descriptions METALLIC Strong malleable solids Don’t dissolve eg copper IONS ONLY IONIC Crystals Dissolve in water eg sodium chloride (salt) IONS + FREE ELECTRONS SIMPLE MOLECULAR Usually Gases eg CO2, H2O ATOMS joined into GIANT MOLECULES GIANT MOLECULAR Hard strong solids Don’t dissolve eg diamond (graphite – special case) MOLECULES ONLY

  2. SUMMARY - PROPERTIES

  3. Structure of an Alloy Draw this picture. What 2 things are obvious from it? Different size atoms Irregular structure This makes alloys HARDERthan pure metals.

  4. Smart Materials Smart materials' 'are materials that have one or more properties that can be significantly changed in a controlled fashion by external stimuli, such as stress, temperature, moisture, pH, electric or magnetic fields.

  5. Smart Liquids When a magnetic field is applied to the fluid it becomes semi-solid and when the field is removed, the fluid returns to a free-flowing liquid. • http://www.youtube.com/watch?v=kL8R8SfuXp8

  6. Shape Memory Alloys A shape memory alloy is an alloy that "remembers" its original, cold, forged shape, and which returns to that shape after being deformed by applying heat. http://www.youtube.com/watch?v=fsBHF_j2FJ4

  7. Exam Question

  8. Nanomaterials Are very small but how small?

  9. Human hair 9 micrometers is equivalent to 0.000009 m 40 microns 9 microns

  10. 0.000000009 m is 9 nm or 0.009 micrometers 0.25 nanometers is the average length of a bond between atoms!!! Very Small Can Make Properites Very Different

  11. Some Potential Uses • Filtration • Catalysis • Tissue engineering • Drug delivery • Diagnostics • Memory storage • Quantum computers • Optoelectronics

  12. Quantum dots

  13. Nanotubes • Cylindrical carbonmolecules have novel properties that make them potentially useful in many applications in nanotechnology, electronics, optics and other fields of materials science, as well as potential uses in architectural fields. They exhibit extraordinary strength and unique electrical properties, and are efficient thermal conductors. Their final usage, however, may be limited by their potential toxicity and controlling their property changes in response to chemical treatment.

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