Nanoparticles

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12 Terms

1

1nm =

10-9 m

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2

Size of nanoparticles

1-100nm in size

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3

Bulk material

Not a nanoparticle

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4

The smaller a particle

the larger the surface area to volume ratio

<p>the larger the surface area to volume ratio</p>
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5

As a cube decreases in size by a factor of 10

Its surface area:volume ratio increases by a factor of 10

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6

Nanoparticles have different properties to bulk materials because

Most atoms are at the surface and they have a high surface area to volume ratio

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7

Uses of nanoparticles

Catalysts, in electronics, in sunscreens.

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8

Advantages of nanoparticles in sunscreen

Better coverage, more effective protection from UV

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9

Disadvantages of nanoparticles in sunscreen

Small enough to enter the bloodstream, could damage cells, could damage the environment

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10

Number of atoms in a nanoparticle

A few hundred atoms

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11

Risks of nanoparticles are unknown

They have not been used for very long

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12

Properties of nanoparticles

Very different to bulk material

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