1. Materials: Structure and Uses
Unit 2 Section D
Materials: Structure and Uses

2. Allotropes: Same Element, Different Structure & Properties
Diamond
Graphite
Buckminsterfullerene

3. Carbon Nanotubes

4. Ceramics
A ceramic is an inorganic, non-metallic solid prepared by the action of heat and subsequent cooling.

5. Properties of Ceramics?
Hardness
Rigidity
Low reactivity
Resistance to wear
Brittle

6. Plastics
Synthetic, (meaning human created) long chains of carbon-atom chains with hydrogen and/or other elements
PET
polystyrene
PVC

7. Properties of Plastics?
Vary greatly
Highly customizable
Most are petroleum based

8. Combining Metals
Alloy: a solid “solution” of atoms of 2 or more metals
Brass
Steel (sort of)
Bronze

10. Properties of alloys
Some are superconductive –conduct electric current without any resistance
Take the properties of their constituent elements

11. Semiconductors Only conduct electricity at certain voltages
Can change the direction of a current
Doping-adds impurities to semiconductors to enhance their properties

12. Modifying Surfaces Coatings
Paints
Varishes
Powder coating
Electroplating: using electric current to coat something with a metal

13. Thin Films