properties of nanoparticles

• what are carbon nanotubes


  cylindrical fullerenes with very high length to diameter ratios. theyre useful for nanotechnology, electronics and materials
• what is nanoscience


  it refers to structures that 1-100nm, only a few hundred atoms
• what is the length of a nanometer

  1-100nm
• length of a fine particle

  100-2500nm
• length of coarse particles

  2500- 10,000 nm
• why may nanoparticles have different properties

  they have a high surface area to volume ratio, optical properties are dependent on size
• what may some of these different properties consist of

  different colours

  different reactivities

  different thermal / electrical conductivities
• true or fale: smaller quanities of nanoparticles may be just as effective as nomal particle sizes

  true
• true or false: nano particles are extremely inefficient and very bad catalysts

  false: they are efficient and cheap catalysts
• what are some uses of nanoparticles


  medicine,

  electronics,

  cosmetics,

  deodorants,

  sun creams,

  catalysts
• why can metals conduct electricity

  the electrons of their outer shells are delocalised and so are free to move.
• metals consist of...


  giant structures of atoms arranged in a regular pattern
• metallic bonding is very strong, therefore...

  metals have high melting and boiling points
• differences and similarities between pure metals and alloys

  similarities:

  both have layers

  differences:

  Alloys have distroted layers

  Pure metals have regular layers.

  Alloys have a mixture of metals

  Pure metals only have one type of atom

  Alloys are much harder

  Pure metals are malleable (soft)

  Alloys layers cannot slide easily

  Pure metals layers slide easily
• why are metals good conductors

  delocalised electrons in the metals can carry the electrical charge through the metal. they also carry thermal energy.