Your SlideShare is downloading. ×
0
5
5
5
5
5
5
5
5
5
5
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

5

360

Published on

Published in: Business, Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
360
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Looking Inside Materials <ul><li>This topic will help you to complete our coursework presentation before Christmas </li></ul><ul><li>It will enable you to explain the properties of a material that make it suitable for an application. You will also be able to explain the reasons for these properties at an atomic level… </li></ul>
  • 2. From Chapter 4… <ul><li>We know how: </li></ul><ul><ul><li>Materials have different properties </li></ul></ul><ul><ul><li>This means that they behave differently under certain conditions i.e. stress </li></ul></ul><ul><ul><li>The amount of a material also affects its behaviour. A wire behaves differently than a block of the same material </li></ul></ul><ul><ul><li>Materials also interact differently with light and electricity </li></ul></ul>
  • 3. Inside Materials <ul><li>How do we see inside materials? </li></ul><ul><li>We can use optical microscopes… </li></ul>
  • 4. What would we see? <ul><li>Visible structures like the grain of wood, the cells in a plants. This can explain physical characteristics. </li></ul>
  • 5. Atomic Structure <ul><li>Why do ceramic materials break easily but metal only dent when struck with a hammer??? </li></ul><ul><li>We need to know what is different INSIDE the materials on an atomic scale </li></ul>
  • 6. Non-Optical Microscopes <ul><li>In pairs summarise the main features of: </li></ul><ul><ul><li>Optical Microscopes </li></ul></ul><ul><ul><li>Scanning Electron Microscopes </li></ul></ul><ul><ul><li>Atomic Force Microscope </li></ul></ul><ul><li>Include: </li></ul><ul><ul><li>The way in which they ‘see’ the image </li></ul></ul><ul><ul><li>What the image is like </li></ul></ul><ul><ul><li>How magnification is calculated </li></ul></ul>
  • 7. Magnification <ul><li>Magnification is dependent on </li></ul><ul><ul><li>Image Size and </li></ul></ul><ul><ul><li>Specimen Size such that: </li></ul></ul><ul><ul><li>Magnification = Image Size / Spec. Size </li></ul></ul><ul><ul><li>What is the magnification of a SEM when the image on the monitor is 10cm and the specimen is 0.5nm? </li></ul></ul><ul><ul><li>M = 10 x 10 -2 / 0.5 x 10 -9 = 200000000 </li></ul></ul><ul><ul><li>If an atom is 0.1nm, how many fit onto the screen? </li></ul></ul><ul><ul><ul><li>0.5nm / 0.1nm = 5 </li></ul></ul></ul><ul><ul><ul><li>Try Scaling Exercise – 20E </li></ul></ul></ul>
  • 8. Types of Structure <ul><li>When a liquid cools it solidifies </li></ul><ul><li>The resulting solid may have an orderly structure (CRYSTALLINE) or disordered (AMORPHOUS). </li></ul>Orderly ‘Crystalline’ Structure Shows some irregularity or ‘Poly-Crystalline’ Structure
  • 9. Crystal Size <ul><li>What affects the size of the crystals in a solid? </li></ul>
  • 10. Cooling and Crystal Size <ul><li>Quick cooling results in _________ crystals </li></ul><ul><li>Slow cooling results in ________ crystals </li></ul>SMALL LARGE

×