Chemistry Level 2 Giant covalent structures and nanomaterials.
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Transcript of Chemistry Level 2 Giant covalent structures and nanomaterials.
Chemistry Level 2
Giant covalent structures and nanomaterials
Giant covalent structures - 1
• Diamond and graphite are forms of carbon with giant covalent structures.
• Fullerenes are another form of carbon used to form nanotubes.
Giant covalent structures - 2
• Thermosoftening polymers do not have cross links between chains.
• They can be melted.• So they can be recycled
Giant covalent structures - 3
• Thermosetting plastics have long chains with cross-links
• This holds the chains in place and makes the plastic rigid – so they can’t be recycled
Nanoparticles
• Fullerenes are examples of nanoparticles
• Nanoparticles are made up of a few hundred atoms
• They measure between one nanometre and 100 nanometres across
Nanoparticles are useful
• Nanotubes have very large surface areas compared with their volumes so make excellent catalysts
• Nanotubes can be used to reinforce tennis rackets because they are so strong and stiff, yet light
• Fullerene cages can deliver dangerous drugs to the site of a tumour or infection
• Nanoparticles are being used for self-cleaning ovens and windows