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What is Nanoscience?. The study of materials at the nanoscale . Nano means small... very small. It is a million times smaller than the smallest measurement you can see on your ruler!. a nanometre is…. 0.000000001 metres OR 1 nm.

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slide1

What is Nanoscience?

The study of materials at the nanoscale.

nano means small very small
Nano means small... very small

It is a million times smaller than the smallest measurement you can see on your ruler!

a nanometre is
a nanometre is…

0.000000001 metres

OR

1 nm

It is the unit we use to measure the building blocks of everything.

slide4

A man’s beard grows

5 nanometres every second.

A human fingernail grows

1 nanometre every second.

slide5
This is a silver nanowire resting on a human hair. Look at a strand of your own hair and imagine how small that is…
slide7

At the nanoscale, strange things happen to materials –

their properties can change.

Different sizes of particles react to light differently.

The colour of gold can range from purple to red depending on the size of the atom clusters.

hundreds of years ago it was known as art
Hundreds of years ago it was known as art

Red stained glass gets its colour from nanoparticles of gold that are only 20 nanometres across.

Orange glass gets its colour from gold nanoparticles that are 80 nanometres across.

Now we call it nanotechnology

why is small good
Why is small good?
  • Faster
  • Lighter
  • Can get into small spaces
  • Cheaper
  • More energy efficient
for example zinc particles in sun cream
for examplezinc particles in sun cream
  • Large Zinc Oxide particles appear white.
  • Nano-scale ZnO particles appear clear.

Both block harmful radiation

nanotechnology
Nanotechnology

The use of nano ideas to make things better and cheaper.

how do we build small things
How do we build small things?
  • “Top-down”– building something by starting with a larger part and carving away material (e.g. like a sculpture).
  • In nanotechnology, chips for computers are made by using acid to dissolve away unwanted material to get the right piece.
slide14

“Bottom-up”– building something by assembling smaller parts (e.g. like building a car engine or Lego).

In nanotechnology, atoms and molecules interact to make making nanowires from metals like silver, or carbon nanotubes.

slide15

Uses of nanotechnology

Health:

Diagnostics, Cancer treatment and

targeted drug delivery.

slide16

Uses of nanotechnology

Materials:

Sports industry, cosmetics, clothing

and space elevators.

slide17

Uses of nanotechnology

Technology:

Faster processing, computers and smaller, more powerful mobile devices.

slide18

Uses of nanotechnology

Environment

Cleaner energy, better energy storage (batteries) and

treatment of water.

slide19

Summary

  • Nanoscience is about understanding how materials behave at the nanoscale.
  • Properties of materials are different at the nanoscale compared to bulk materials.
  • Nanotechnology is about applying our understanding of materials to make new products and improve existing ones.
  • Points to remember:
  • How big a nanometre is.
  • Our bodies can detect nanoparticles.
  • Nanoparticles are not all man made.
slide20

Activity 1 You will need

  • A height chart or two metre rules.
  • Fix the height chart vertically on a wall,

or the two rules together.

  • Lean your back against the height chart

and stand up straight, heels touching the wall.

  • Get someone to measure your height on the chart.
  • Use a book held flat on your head for an

accurate measurement – why?

  •  Write your name on the chart.
  • Write your height on the chart.
  • How tall are you in nanometres? In metres?
activity 2
Activity 2

Each group has nine test-tubes carefully filled with 9 ml of water and numbered 1 to 9

First person - with the Pasteur pipette, carefully measure 1 ml of food colouring and add it to tube number 1.

Mix the tube thoroughly so that the colour is even throughout.

Everybody smell the tube

What does it smell of? Does it smell the same as the original food colouring? Put a stopper in the tube or tape over the top.

.

slide22

Activity 2 page 2

*The next person takes 1 ml of liquid from the tube just closed and adds it to the next tube of water. Reseal the previous tube.

Mix the tube thoroughly so that the colour is even throughout.

Everybody smell the tube? What does it smell of?

Does it smell the same as the original food colouring?*

Repeat the instructions in red from * to * for each tube, one at a time.

You are diluting the contents of tube 1 into tube 2, tube 2 into tube 3, and so on, until you dilute the contents of tube 8 into tube 9, repeating the mixing and smelling before doing the next dilution.

slide23

Activity 2 page 3

At what point can you no longer see any red in the tubes?

At what point can you no longer smell anything in the tubes?

Is there a difference?

In each tube the food colouring is ten times more dilute than the previous tube. By the time you reach the ninth tube the original food colouring has been diluted by a billion times,

so for every part of food colouring there are a billion parts of water.

This experiment shows the sensitivity of our senses.

Our sense of smell allows us to detect very dilute amounts of food colouring after we are no longer able to see any trace of it.

We can only see relatively large objects, but our sense of taste and sense of smell can detect individual molecules which are just tens of nanometres in size.