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This lesson covers modern materials — materials that have been developed relatively recently through innovations in science and technology. Modern materials are a key topic in AQA GCSE Design and Technology (8552), Section 3.1.3.
Modern materials are those that have been engineered or discovered through recent technological advances. They offer improved properties compared to traditional materials and enable new product designs that were previously impossible.
Graphene is a single layer of carbon atoms arranged in a hexagonal lattice. It was first isolated in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester — an achievement that won them the Nobel Prize in Physics in 2010.
| Property | Detail |
|---|---|
| Strength | 200 times stronger than steel (by weight) |
| Thickness | One atom thick — the thinnest material known |
| Conductivity | Excellent electrical and thermal conductor |
| Flexibility | Can be bent, twisted and stretched without breaking |
| Transparency | Almost completely transparent (absorbs only 2.3% of light) |
| Lightweight | Extremely low density |
| Application | How Graphene Is Used |
|---|---|
| Sports equipment | Added to tennis rackets (Head Graphene) and cycling helmets for strength without weight |
| Electronics | Potential replacement for silicon in faster, smaller transistors |
| Touchscreens | Transparent, conductive graphene could replace brittle indium tin oxide (ITO) |
| Batteries | Graphene-enhanced batteries charge faster and store more energy |
| Water filtration | Graphene oxide membranes can filter salt from seawater |
| Composites | Added to polymers and metals to improve strength and conductivity |
AQA Exam Tip: Graphene is one of the most commonly examined modern materials. Remember its three headline properties: strongest, thinnest and most conductive. Link these to specific product applications for full marks.
A metal foam is a metallic structure containing a large number of gas-filled pores (like a sponge). They are typically made from aluminium, but can also be made from steel, titanium or copper.
| Property | Detail |
|---|---|
| Lightweight | Up to 90% air — much lighter than solid metal |
| Energy absorption | Deforms progressively under impact, absorbing kinetic energy |
| Sound insulation | Porous structure dampens sound waves |
| Thermal insulation | Trapped air provides insulation |
| Stiffness | High stiffness-to-weight ratio |
| Application | Why Metal Foam Is Used |
|---|---|
| Crash protection | Car bumpers and body panels absorb impact energy, protecting passengers |
| Aerospace | Lightweight structural panels reduce aircraft weight and fuel consumption |
| Architecture | Decorative and structural panels with interesting visual texture |
| Biomedical | Porous titanium foam mimics bone structure for implants — bone grows into the pores |
| Heat exchangers | Large surface area improves heat transfer efficiency |
Liquid crystals are substances that flow like a liquid but have molecules arranged in a crystal-like structure. When an electric field is applied, the molecules change orientation, altering how light passes through them.
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