C1b topic 8 (a) Smart materials and nano-technology You will find out: ● What smart materials can do ● What nanotechnology is all about ● The uses of teflon, kevlar, goretex, polyurethene

Use this quiz as a start point to talk about smart materials ● e/science/quizengine?quiz=edexcelsmart_materia ls;templateStyle=science

Class discussion ● Produce a spider diagram about smart and designer materials, their properties and uses

Nano technology ● Nanoparticles range in size from about 100 nm down to about 1 nm. They are typically the size of small molecules and are far too small to see with a microscope. ● Working with nanoparticles is called nanotechnology. Try a quiz: ine?quiz=edexcelnanotechnology&templateStyle=science

Past paper questions 1. Dan is wearing a hat made of Thinsulate, which is a very good insulator. The main purpose of the hat will be to A keep Dan dry if it rains B reduce heat loss from Dan’s head C keep flies away D make Dan look good

2. Dan’s boots have a Sympatex lining. This is used because, in wet snow, it is important that his boots are A waterproof B slippery C heavy D colourful

3. Dan is wearing a jacket made from Gore-Tex. The jacket will A keep him dry if it rains B keep him cool in hot weather C allow sunlight to reach his skin D repel insects 4. Gore-Tex is said to be ‘breathable’. This means it A allows oxygen to pass in and carbon dioxide to pass out B allows oxygen to pass out and carbon dioxide to pass in C allows water vapour to pass in but stops water passing out D allows water vapour to pass out but stops water passing in

5. The poles of Dan’s tent are made from a material containing carbon fibres. Carbon fibres make the poles stronger and lighter in weight. The advantage of these poles, compared with steel poles, is that they make the tent A waterproof B easier to carry C more comfortable to sleep in D breathable

6. Dan’s drink is in an aluminium can. He knows that it is important to recycle the empty can. It is important to recycle aluminium cans because A some cans will be refilled B aluminium is a very rare metal C aluminium rusts slowly D recycling saves natural resources