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    5 5 Presentation Transcript

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