Special Materials Flashcards

1
Q

What is GRAPHENE a form of? Its structure of atoms, its properties and why it makes graphene useful.

A
  • .Graphene is a form of carbon. It is a single layer of graphite.
  • .The atoms are arranged in a hexagonal structure, just one atom thick.
  • Graphine is a very strong, a good thermal and electrical conductor and nearly transparent
  • These properties make graphene useful in electronics and composite materials.
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2
Q

What is that element that can also form molecules known as fullerene? What does fullerene contain?

A

Carbon, which contains different numbers of carbon atoms.

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3
Q

What molecule can carbon form? What does molecule contain?

A

Carbon can also form molecules know as fullerenes, which contain different number of carbon atoms.

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4
Q

What is the Structure of fullerenes based on, what does it contain?

A

~ based on hexagonal rings of carbon atoms. Sometimes these rings contain five or seven carbon atoms.
~have hollow shapes, including tubes, balls and cages

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5
Q

Carbon nanotubes, why their properties make them useful?

A

Cylindrical fullerenes with very high length to diameter ratios.
The properties of carbon nanotubes make them very useful for use in nanotechnology, electronics and materials.

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6
Q

What can Fullerenes be used for?

A

Deliver drugs in the body; in lubricants; as catalysts; for reinforcing materials, e.g. the frames of tennis rackets, so that they are strong but still lightweight.

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7
Q

polymers structure,bonding. Is the the intermolecular force strong - what does this mean? How is it produced?

A

Polymers consist of very large molecules.
Atom with polymer molecules are held together by strong covalent bonds. This means that polymers are solid at room temp.
Produced when lots of ethene molecules are joined together. It is cheap and strong and is used to make plastic bottles and bags.

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8
Q

Nanoparticle diameter

A

Nanoparticles have a diameter between 1nm and 2500nm or 1x10^-9m and 1x10^-7m.

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9
Q

Nanoparticles, atom and structure.

A
  • Nanoparticles contain only a few hundred atoms
  • atoms can be placed into exactly the right position so smaller quantities are needed to achieve the required properties
  • They can combine to form structures called nanostructures.
  • Nanostructures can be manipulated, so materials can be developed that have new and specific properties.
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10
Q

What are the properties of Nanoparticles? What are they used for?

A

The properties are different to the properties of the same materials in bulk e.g. nanoparticles are more sensitive to light,heat and magnesium.
used in sunscreen, protection from the suns harmful ultraviolet rays.

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