GCSE Chemistry (AQA)

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Properties of Nanoparticles

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Bonding, structure, and the properties of matter Bulk and surface properties of matter including nanoparticles

Properties of Nanoparticles

4:10 Nanoparticles
Spec 4.2.4.1
Previous The Size of Particles Next Uses of Nanoparticles
  • Nanoparticles have different properties compared to the same material in bulk.
  • Titanium dioxide (TiO2) is used in two forms: bulk powder and nanoparticles.
  • Bulk powder form of titanium dioxide is used as a white pigment in paint.
  • Nanoparticle form of titanium dioxide is used in sun cream to block UV light and prevent sunburn, appearing transparent on the skin.
  • Nanoparticles have a higher surface area to volume ratio than bulk materials.
  • Smaller particles have a larger surface area to volume ratio.
  • Example with cubes: as cubes are divided into smaller cubes, the surface area increases while volume remains the same.
  • Surface area to volume ratio increases as particle size decreases.
  • High surface area to volume ratio of nanoparticles means smaller quantities are needed to be effective.
  • Nanoparticle sun cream can be as effective as normal sun cream with a smaller quantity.

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