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Nano science

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					D. Crowley, 2009
                                                            Thursday, June 02, 2011


Nano-science
 To understand what nano-science is, and to be able to evaluate nano-
  materials
Nano-science
 What is nano-science?


 Nanoscience is a new branch of science that refers to structures built
  from a few hundred atoms and are 1-100nm big

 Their properties could lead to new developments in computers,
  building materials, medicine etc...
Nano-science
 Nanoparticles are tiny manufactured structures only a few hundred
  atoms

 A nanometer is a tiny unit of measurement at about 1/1,000,000,000
  metres

 The atoms in nanoparticles are regularly arranged in hollow structures
  such as tubes and spheres one atom thick – being so small,
  nanoparticles have a very high surface area to volume ratio

 They show different properties to the same materials in bulk and they
  also have a large surface area to volume ratio
Material
 A nanoparticle is a tiny manufactured structure of a few hundred
  atoms, from 1 to about 100 nanometres long (a human hair is about
  100,000 nanometres wide)

 Nanoparticles are made from carbon, metals and metal compounds


 Working with nanoparticles is called nanotechnology
Measurements
  Unit name    Unit symbol          Meaning

  Gigameter       Gm             1 billion meters

  Megameter       Mm            1 million meters

  Kilometer        km          1 thousand meters

    Meter          m                 1 meter

  Millimeter      mm         1 thousandth of a meter

  Micrometer       μm         1 millionth of a meter

  Nanometer        nm         1 billionth of a meter
Application
 Nanoparticles have a very large surface area compared with their
  volume, so they are often able to react very quickly making them useful
  as catalysts to speed up reactions, e.g. they can be used in self-cleaning
  ovens and windows

 Nanoparticles also have different properties to the same substance in
  normal-sized pieces, e.g. titanium dioxide is a white solid used in house
  paint and certain sweet-coated chocolates – titanium dioxide
  nanoparticles are so small they do not reflect visible light, so cannot be
  seen and are used in sunblock creams to block harmful ultraviolet light
  without appearing white on the skin
Future Application
 Nanoscience may lead to the development of: -
    New catalysts
    New coatings
    New computers
    Stronger and lighter building materials
    Sensors that detect individual substances in tiny amounts
Task
 Using the laptops research nano-science…


 Choose some specific nano-particles – find what they are made from,
  what properties do they have, what applications will they be put to
  etc…

 Produce a brochure highlighting your findings – be concise and to the
  point!

				
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